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Renal sympathetic nerves play an important role in the development of hypertension&#44; mediated via sodium and water retention&#44; increased renin release&#44; and alterations in renal blood flow&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">5</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Experimental studies established the important concept that sub-vasoconstrictor levels of renal sympathetic activity can increase renin secretion and renal sodium retention without changing renal hemodynamics&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">6</span></a> Assessment of regional overflow of norepinephrine &#40;NE&#41; from the kidneys to plasma has demonstrated that renal NE spillover rates can be markedly elevated in patients with essential hypertension and are associated with hypertensive end-organ damage&#46;<a class="elsevierStyleCrossRefs" href="#bib0260"><span class="elsevierStyleSup">5&#44;31</span></a> Measurement of NE excretion in the urine&#44; now largely obsolete&#44; was performed in order to quantify sympathetic nervous system activity in humans&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">6</span></a> In the light of these findings&#44; RDN therapy was considered a logical therapeutic approach in the treatment of hypertension&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">The sympathetic nervous system and cardiovascular disease<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">7</span></a></span><p id="par0025" class="elsevierStylePara elsevierViewall">Surgical sympathectomy was first introduced in the 1930s and was effective in lowering high BP in patients with severe hypertension&#46;<a class="elsevierStyleCrossRefs" href="#bib0275"><span class="elsevierStyleSup">8&#44;9</span></a> However&#44; the side effects associated with the procedure and the introduction of ganglionic blockers made it obsolete&#46;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">10</span></a> For a long time&#44; it was difficult to study and assess the role of the sympathetic nervous system &#40;SNS&#41; in the pathogenesis of hypertension&#44; due not to uncertainty concerning the relation between the two&#44; but rather to the difficulty of testing and assessing that relation&#46; Previous techniques included the measurement of serum and urinary excretion of NE and its derivatives&#44; yielding a rough estimate of SNS activity in the whole body&#46;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">11</span></a> Hagbarth and Vallbo reported microneurography as a newer tool to study SNS nerve firing in subcutaneous tissues and skeletal muscles&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">12</span></a> The NE spillover technique was first used by Esler et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">13</span></a> measuring organ-specific NE release in its efferent veins as an indirect measurement of SNS nerve fiber firing in an individual organ&#44;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">14</span></a> and that technique was later used to demonstrate that heart failure caused SNS overactivity&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">15</span></a> Accumulated evidence underlines the role of sustained chronic SNS activity in many diseases including ischemic heart disease&#44;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">16</span></a> heart failure&#44;<a class="elsevierStyleCrossRefs" href="#bib0320"><span class="elsevierStyleSup">17&#44;18</span></a> hypertension&#44;<a class="elsevierStyleCrossRefs" href="#bib0330"><span class="elsevierStyleSup">19&#8211;21</span></a> kidney disease&#44;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">22</span></a> type 2 diabetes&#44;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">23</span></a> obesity&#44;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">23</span></a> metabolic syndrome&#44;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">23</span></a> obstructive sleep apnea&#44;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">24</span></a> depression&#44;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">25</span></a> and inflammatory bowel disease&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">26</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">In the cardiovascular system&#44; chronic SNS activation not only raises BP but also causes hypertrophy and proliferation of vascular smooth muscle cells and cardiac myocytes&#44; thus increasing LV mass and wall thickness&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">27</span></a> In addition&#44; increased SNS activity&#44; in the presence of endothelial dysfunction and endothelial cell damage&#44; has been shown to contribute to the development of atherosclerosis&#46;<a class="elsevierStyleCrossRefs" href="#bib0360"><span class="elsevierStyleSup">25&#44;27&#44;29</span></a> Contradicting previous assumptions&#44; high levels of NE spillover from the heart in heart failure<a class="elsevierStyleCrossRef" href="#bib0375"><span class="elsevierStyleSup">28</span></a> demonstrated increased sympathetic activity in the failing heart&#44; which was the rationale for the subsequent use of beta-blockers in heart failure&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">29</span></a> In essential hypertension&#44; SNS outflow to the kidneys is elevated and is directly proportional to the severity of hypertension&#46;<a class="elsevierStyleCrossRefs" href="#bib0330"><span class="elsevierStyleSup">19&#44;21&#44;25</span></a> This finding is also supported by regional measurements of NE spillover to the kidneys&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">30</span></a> Renal sympathetic activity is a major factor contributing to the pathogenesis of essential hypertension through its influence on activation of the renin-angiotensin system&#44; sodium and water excretion&#44; peripheral vasoconstriction&#44; cardiac contraction&#44; and venous capacitance&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">25</span></a> The recent introduction of safe and efficient methods for RDN has led to a renewed interest in the role of SNS activation in essential hypertension&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Evidence of the efficacy of renal denervation in the treatment of resistant hypertension</span><p id="par0035" class="elsevierStylePara elsevierViewall">The Rapid Renal Sympathetic Denervation for Resistant Hypertension Using the OneShot&#8482; Ablation System &#40;RAPID&#41; study<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">32</span></a> was a prospective&#44; multicenter&#44; non-randomized&#44; single-arm trial that included 50 patients with mean office BP of 181&#177;20&#46;8&#47;95&#177;15&#46;5 mmHg&#44; on a mean of five antihypertensive medications&#44; who received RDN&#46; The primary endpoint studied was the rate of office systolic BP &#40;SBP&#41; reduction&#58; &#8805;10 mmHg at six months in comparison to baseline&#46; Change in 24-hour ambulatory BP &#40;ABP&#41; was also evaluated&#46; At the six-month mark&#44; there was a decrease in mean office BP of -20&#47;-8 mmHg &#40;p&#60;0&#46;0001&#47;p&#61;0&#46;0002&#41; in comparison to baseline&#46; This trend was sustained at 12 months&#44; with a decrease in mean office BP of -22&#47;-8 mmHg &#40;p&#60;0&#46;0001&#47;p&#61;0&#46;0014&#41;&#46; Likewise&#44; there was a significant reduction in 24-hour ABP&#44; of -11&#47;-6 mmHg at six months in comparison to baseline &#40;p&#61;0&#46;0085&#47;p&#61;0&#46;037&#41;&#46; At 12 months&#44; the reduction in 24-hour ABP was -9&#47;-5 mmHg &#40;p&#61;0&#46;054&#47;p&#61;0&#46;073&#41;&#46; Device- and&#47;or procedure-related adverse effects occurred in three patients up to 12 months&#44; namely one access site infection&#44; one renal artery stenosis&#44; and one groin paresthesia&#46; The authors concluded that RDN led to significant and sustained reductions in office and 24-hour ambulatory BP at six and 12 months&#44; respectively&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">The REDUCE-HTN study<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">33</span></a> was a prospective&#44; non-randomized&#44; single-arm trial that included 146 patients with mean baseline office and ambulatory BP of 182&#177;18&#46;4&#47;100&#177;14&#46;0 and 153&#177;15&#46;1&#47;87&#177;13&#46;2 mmHg&#44; respectively&#44; who received RDN using the Vessix renal denervation system&#46; The primary efficacy endpoints were reductions in office and 24-hour ambulatory SBP and diastolic blood pressure &#40;DBP&#41; at six months&#44; which were 24&#46;7&#177;22&#46;1&#47;10&#46;3&#177;12&#46;7 mmHg &#40;p&#60;0&#46;0001&#41; and 8&#46;4&#177;14&#46;4&#47;5&#46;9&#177;9&#46;1 mmHg &#40;p&#60;0&#46;0001&#41;&#44; respectively&#46; Regarding the safety endpoints&#44; no acute renal injury requiring acute renal intervention occurred and only one patient developed renal artery stenosis that required a stent&#46; In addition&#44; mean glomerular filtration rate remained stable&#46; The authors concluded that renal artery denervation reduced both office and ambulatory BP at six months in patients with resistant hypertension&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">The EnligHTN I study<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a> was a prospective&#44; non-randomized trial that included 46 patients with mean baseline office&#44; 24-hour ambulatory and home BP of 176&#47;96&#44; 150&#47;83 and 158&#47;90 mmHg&#44; respectively&#44; who underwent RDN using the EnligHTN multielectrode radiofrequency ablation system&#46; The primary efficacy endpoint was change in office BP in comparison to baseline&#46; The mean reductions in office BP at 1&#44; 3&#44; 6&#44; and 12 months were -28&#47;-10&#44; -27&#47;-10&#44; -26&#47;-10&#44; and -27&#47;-11 mmHg&#44; respectively &#40;p&#60;0&#46;001 for all&#41;&#46; Likewise&#44; mean reductions in 24-hour ABP were -10&#47;-5&#44; -10&#47;-5&#44; and -10&#47;-6 mmHg at 1&#44; 3&#44; 6 months &#40;p&#60;0&#46;001 for all&#41;&#44; and -7&#47;-4 mmHg at 12 months &#40;p&#60;0&#46;0094&#41;&#46; Mean reductions in home measurements were -9&#47;-4&#44; -8&#47;-5&#44; -10&#47;-7&#44; and -11&#47;-6 mmHg &#40;p&#60;0&#46;001 at 12 months&#41;&#46; There were no signs of worsening renal function at 12 months&#46; One patient required renal artery stenting &#40;non-occlusive renal stenosis was present at baseline&#41;&#46; The authors concluded that the EnligHTN ablation system was safe and effective in reducing office&#44; 24-ambulatory and home BP in patients with resistant hypertension&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Oslo RDN<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">35</span></a> was a prospective randomized trial in which 19 patients with true treatment-resistant hypertension were randomized to RDN &#40;n&#61;9&#41; performed with the Symplicity Catheter System vs&#46; clinically adjusted drug treatment &#40;n&#61;10&#41;&#46; True treatment-resistant hypertension was confirmed after excluding patients with confounding poor drug adherence&#46; The primary endpoint was change in office systolic blood pressure &#40;SBP&#41; from randomization to six months&#46; The study was stopped early as RDN had uncertain BP-lowering effects&#46; At six months&#44; office SBP and DBP changed significantly from 160&#177;14&#47;88&#177;13 mmHg to 132&#177;10&#47;77&#177;8 mmHg compared to baseline in the drug-adjusted group &#40;p&#60;0&#46;0005 and p&#61;0&#46;02&#41;&#44; whereas in the RDN group there was no significant change in office SBP and DBP at six months compared to baseline &#40;156&#177;13&#47;91&#177;15 to 148&#177;7&#47;89&#177;8 mmHg&#44; p&#61;0&#46;42 and p&#61;0&#46;48&#41;&#46; SBP and DBP were significantly lower in the drug-adjusted group at six months &#40;p&#61;0&#46;002 and p&#61;0&#46;004&#44; respectively&#41;&#44; and absolute changes in SBP were larger in the drug-adjusted group &#40;p&#61;0&#46;008&#41;&#46; ABP changed in parallel to office BP&#46; The authors concluded that the BP-lowering effect of adjusted drug treatment were superior to that of RDN in patients with true treatment-resistant hypertension&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The Prague-15 study<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">36</span></a> was a prospective&#44; open-label multicenter trial in which 106 patients with resistant hypertension were randomized to RDN &#40;n&#61;52&#41; or intensified pharmacological treatment &#40;n&#61;54&#41;&#46; RDN was performed using the Symplicity Renal Denervation System&#46; At six months&#44; a comparable significant reduction in mean 24-hour SBP was noted in both groups&#44; of -8&#46;6 mmHg &#40;95&#37; confidence interval &#91;CI&#93;&#58; -11&#46;8&#44; -5&#46;3&#41;&#59; p&#60;0&#46;001 in RDN&#44; vs&#46; -8&#46;1 &#40;95&#37; CI&#58; -12&#46;7&#44; -3&#46;4&#41; mmHg in the pharmacological group&#46; Likewise&#44; a significant reduction in office SBP was observed in both groups mmHg &#40;-12&#46;4 &#91;95&#37; CI&#58; -17&#46;0&#44; -7&#46;8&#93;&#59; p&#60;0&#46;001 in RDN vs&#46; -14&#46;3 mmHg &#91;95&#37; CI&#58; -19&#46;7&#44; -8&#46;9&#93;&#59; p&#60;0&#46;001 in the pharmacological group&#41;&#46; The authors concluded that RDN was safe&#59; however in the setting of true resistant hypertension with confirmed compliance&#44; it was not proved superior to intensified pharmacological treatment&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">The DENERHTN trial<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a> was a prospective&#44; open-label randomized controlled trial that assigned 106 patients to receive either RDN plus a standardized stepped-care antihypertensive treatment &#40;SSAHT&#41; regimen &#40;RDN group&#44; n&#61;53&#41; or SSAHT alone &#40;control group&#44; n&#61;53&#41;&#46; Prior to randomization&#44; treatment resistance was confirmed by ABP monitoring after patients received oral antihypertensives for a period of four weeks&#46; The primary endpoint studied was the mean change in daytime SBP from baseline to six months as assessed by ambulatory BP monitoring&#46; The safety outcomes were the incidence of acute adverse events of the RDN procedure and the change in estimated glomerular filtration rate from baseline to six months&#46; At six months&#44; the mean change in daytime ambulatory SBP was -15&#46;8 mmHg &#40;95&#37; CI -19&#46;7 to -11&#46;9&#41; in the RDN group and -9&#46;9 mmHg &#40;-13&#46;6 to -6&#46;2&#41; in the group receiving SSAHT alone&#44; a baseline-adjusted difference of -5&#46;9 mmHg &#40;-11&#46;3 to -0&#46;5&#59; p&#61;0&#46;0329&#41;&#46; The numbers of antihypertensive drugs and drug adherence at six months were similar between the two groups&#46; Three minor RDN-related adverse events were noted &#40;lumbar pain in two patients and mild groin hematoma in one patient&#41;&#46; The authors concluded that RDN plus SSAHT decreases ambulatory BP more than the same SSAHT alone at six months in patients with well-defined resistant hypertension&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">The Symplicity HTN studies</span><p id="par0065" class="elsevierStylePara elsevierViewall">The Symplicity HTN-1 study<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a> was a proof-of-principle trial of therapeutic renal sympathetic denervation&#46; The trial included 50 patients with resistant hypertension who received percutaneous radiofrequency catheter-based RDN using the Symplicity catheter&#44; with a one-year follow-up post procedure&#46; The primary endpoints were office BP and safety data before and at 1&#44; 3&#44; 6&#44; 9&#44; and 12 months after procedure&#46; Out of the 50 patients enrolled&#44; five were excluded for anatomical reasons&#46; Treated patients were on a mean of 4&#46;7 antihypertensive medications&#44; with baseline mean office BP of 177&#47;101 mmHg&#46; Office BP readings after the procedure were reduced by -14&#47;-10&#44; -21&#47;-10&#44; -22&#47;-11&#44; -24&#47;-11&#44; and -27&#47;-17 mmHg at 1&#44; 3&#44; 6&#44; 9&#44; and 12 months&#44; respectively&#46; In the five non-treated patients&#44; mean rise in office BP was &#43;3&#47;-2&#44; &#43;2&#47;&#43;3&#44; &#43;14&#47;&#43;9&#44; and &#43;26&#47;&#43;17 mmHg at 1&#44; 3&#44; 6&#44; and 9 months&#44; respectively&#46; The only reported complication was one intraprocedural renal artery dissection which occurred before radiofrequency energy delivery&#46; The authors concluded that catheter-based RDN leads to substantial and sustained BP reduction&#44; without serious adverse events&#44; in patients with resistant hypertension&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Following the success achieved in the Symplicity HTN-1 trial&#44; the Symplicity HTN-2 trial<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a> was designed to assess the effectiveness and safety of catheter-based RDN for BP reduction in patients with treatment-resistant hypertension&#46; A total of 106 patients with resistant hypertension were randomly assigned to either RDN with medical treatment &#40;treatment arm&#44; n&#61;52&#41; or medical treatment alone &#40;control arm&#44; n&#61;54&#41;&#46; The primary endpoint of the study was change in office-based measurement of SBP at six months&#46; At six months&#44; there was a significant reduction in office-based BP measurements in the treatment arm &#40;change of 32&#47;12 mmHg&#44; standard deviation &#91;SD&#93; 23&#47;11&#44; baseline of 178&#47;96 mmHg&#41;&#44; compared to the control arm &#40;change of 1&#47;0 mmHg&#44; SD 21&#47;10&#44; baseline of 178&#47;97 mmHg&#41;&#46; Between-group differences in BP at six months were 33&#47;11 mmHg &#40;p&#60;0&#46;0001&#41;&#46; Additionally&#44; at six months&#44; 41 &#40;84&#37;&#41; out of 49 patients in the treatment arm had a reduction in SBP of 10 mmHg or more&#44; compared with 18 &#40;35&#37;&#41; of 51 controls &#40;p&#60;0&#46;0001&#41;&#46; No serious procedural complications were noted&#46; The authors concluded that catheter-based RDN can safely be used to substantially reduce BP in treatment-resistant hypertensive patients&#46; Follow-up at 36 months in 40 of the 52 patients in the initial RDN group and at 30 months in 30 of 37 patients who crossed over and received RDN at six months<a class="elsevierStyleCrossRef" href="#bib0435"><span class="elsevierStyleSup">40</span></a> showed that SBP decreased by 34 mmHg &#40;95&#37; CI&#58; -40&#44; -27&#44; p&#60;0&#46;01&#41; and DBP decreased by 13 mmHg &#40;95&#37; CI&#58; -16&#44; -10&#44; p&#60;0&#46;01&#41; from a baseline of 184&#177;19&#47;99&#177;16 mmHg&#46; SBP and DBP reductions at 36 months for the initial RDN group was -33 mmHg &#40;95&#37; CI&#58; -40&#44; -25&#44; p&#60;0&#46;01&#41; and -14 mmHg &#40;95&#37; CI&#58; -17&#44; -10&#44; p&#60;0&#46;01&#41;&#44; respectively&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">In an attempt to further explore the robustness of RDN in the treatment of resistant hypertension&#44; the Symplicity HTN-3 trial<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">41</span></a> was conducted&#46; Unlike the previous two studies&#44; blinding and sham-control were added in the design of this trial&#46; A total of 535 patients with severe resistant hypertension receiving a stable antihypertensive regimen involving maximally tolerated doses of at least three drugs including a diuretic were randomly assigned in a 2&#58;1 ratio to undergo RDN &#40;n&#61;364&#41; or a sham procedure &#40;n&#61;171&#41;&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">The primary efficacy endpoint&#44; change in office SBP at six months&#44; was not significantly different between the two groups &#40;-14&#46;13&#177;23&#46;93 mmHg in the denervation group compared to -11&#46;74&#177;25&#46;94 mmHg in the sham-procedure group &#91;p&#60;0&#46;001 for both comparisons of the change from baseline&#93;&#44; a difference of -2&#46;39 mmHg &#91;95&#37; CI&#58; -6&#46;89 to 2&#46;12&#59; p&#61;0&#46;26 for superiority with a margin of 5 mm Hg&#93;&#41;&#46; Likewise&#44; for the secondary efficacy endpoint&#44; the change in mean 24-hour ambulatory SBP&#44; no between-group differences were noted -6&#46;75&#177;15&#46;11 mmHg in the denervation group and -4&#46;79&#177;17&#46;25 mmHg in the sham-procedure group&#44; for a difference of -1&#46;96 mmHg &#40;95&#37; CI&#58; -4&#46;97 to 1&#46;06&#59; p&#61;0&#46;98 for superiority with a margin of 2 mmHg&#41;&#46; The primary safety endpoint &#40;a composite of death&#44; end-stage renal disease&#44; an embolic event resulting in end-organ damage&#44; renovascular complications&#44; or hypertensive crisis within 30 days or new renal-artery stenosis of more than 70&#37; within six months&#41; was not significantly different between the two groups&#46; The authors concluded that their blinded trial did not show a significant reduction of SBP in patients with resistant hypertension six months after renal-artery denervation compared with a sham control&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a> shows a summary of trials of RDN&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Discussion</span><p id="par0090" class="elsevierStylePara elsevierViewall">The role of RDN in the treatment of resistant hypertension is still to be fully clarified&#46; While the results of the RAPID&#44; REDUCE-HTN&#44; EnligHTN&#44; Symplicity HTN-1 and -2&#44; and DENERHTN trials were positive&#44; this was not the case in the Oslo RDN&#44; Prague-15 and Symplicity HTN-3 trials&#46; The varying results may be explained by several factors&#46; Symplicity HTN-3&#44; the largest trial to date&#44; was also the only one that included a sham-control group&#46; As shown by Meissner et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">46</span></a> sham procedures may be associated with a significant positive response &#8211; the placebo effect &#8211; that could be misinterpreted as a real treatment effect&#46; Kandzari et al&#46;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">42</span></a> investigated potential reasons for the discordant results noted in Symplicity HTN-3&#46; Their findings showed that between randomization and the six-month endpoint&#44; 39&#37; of patients underwent medication changes involving alteration in both the dose and class of prescribed medications&#46; In addition&#44; African-Americans were more likely to be prescribed vasodilators than non-African-Americans in both study arms&#46; A total of 56&#37; of African-American sham patients and 46&#46;7&#37; of African-American RDN patients were receiving a vasodilator&#44; compared to 40&#46;5&#37; of non-African-American sham control patients and 33&#46;7&#37; of non-African-American RDN patients who were receiving a vasodilator at baseline&#46; African-Americans in the sham control study arm receiving a vasodilator showed an enormous decline in SBP &#40;-21&#46;9&#43;29&#46;1 mmHg&#41;&#44; which was not noted in the other subgroups&#46; This unexpectedly large SBP decline in African-American control patients may indicate a change in medical adherence or type of therapy in this specific group&#46; Likewise&#44; increasing number of ablations and energy delivery in a four-quadrant pattern was associated with greater reductions in office and ambulatory SBP and heart rate&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">The ablation catheters used in the above studies had some design features that are worthy of mention&#46; The EnligHTN denervation system is a unique multielectrode catheter that allows a predictable pattern of four simultaneous ablations&#46; The Vessix denervation system used in the REDUCE-HTN trial delivered bipolar radiofrequency energy as opposed to the monopolar radiofrequency energy delivered by the Symplicity denervation system &#40;used in the Symplicity HTN studies&#41;&#46; As suggested by Kandazari et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">42</span></a> differences in ablation energy may affect the efficacy of denervation therapy&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">The future</span><p id="par0100" class="elsevierStylePara elsevierViewall">Several trials are underway to investigate the role of RDN in specific patient populations such as those with chronic renal disease and moderate hypertension&#46;<a class="elsevierStyleCrossRefs" href="#bib0450"><span class="elsevierStyleSup">43&#8211;45</span></a></p><p id="par0105" class="elsevierStylePara elsevierViewall">The SPYRAL HTN Global Clinical Trial Program<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a> is a phased series of clinical trials designed to establish the efficacy of RDN therapy in patients with hypertension&#46; The SPYRAL HTN-OFF MED trial aims to confirm the basic hypothesis that RDN therapy lowers BP in patients with hypertension without treatment&#44; while the parallel SPYRAL HTN-ON MED trial is designed to assess the efficacy of RDN integrated with antihypertensive medications&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Conclusions</span><p id="par0110" class="elsevierStylePara elsevierViewall">The results of the RAPID&#44; REDUCE-HTN&#44; EnligHTN&#44; Symplicity HTN-1 and -2&#44; and DENERHTN trials suggested an important role for RDN in the treatment of resistant hypertension&#46; The results of the Oslo RDN&#44; Prague-15 and Symplicity HTN-3 suggested differently&#46; Of note&#44; all these studies showing favorable benefits of RDN were either non-randomized single-arm trials or randomized unblinded trials without a sham control group&#46; As shown by Meissner et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">46</span></a> sham procedures may be associated with a significant positive response &#8211; the placebo effect &#8211; that could be misinterpreted as a real treatment effect&#46; Symplicity HTN-3&#44; a well-designed randomized&#44; blinded&#44; sham control trial&#44; casts doubt on the benefits of RDN in the treatment of resistant hypertension&#46; The results of the Symplicity HTN-3 emphasize the need always to assess for a potential placebo effect by including sham control study groups when assessing the efficacy of new devices&#46; In addition&#44; future studies should ensure consistent medical therapy and delivery of radiofrequency ablation across treatment arms&#44; as post-hoc analysis showed these differences to be important in the neutral results noted in Symplicity HTN-3&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">Currently&#44; the role of RDN in addition to medical therapy in the treatment of resistant hypertension is still to be fully clarified&#46; Nevertheless&#44; RDN is certainly not dead&#44; but further well-designed clinical trials are needed to ascertain the benefits or otherwise of RDN in treatment-resistant hypertension&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Conflicts of interest</span><p id="par0120" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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              "identificador" => "abst0010"
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          "identificador" => "xpalclavsec744947"
          "titulo" => "Palavras-chave"
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        4 => array:2 [
          "identificador" => "sec0005"
          "titulo" => "Introduction"
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        5 => array:2 [
          "identificador" => "sec0010"
          "titulo" => "Historical perspective"
        ]
        6 => array:2 [
          "identificador" => "sec0015"
          "titulo" => "Anatomical and physiological effects of renal denervation"
        ]
        7 => array:2 [
          "identificador" => "sec0020"
          "titulo" => "The sympathetic nervous system and cardiovascular disease"
        ]
        8 => array:2 [
          "identificador" => "sec0025"
          "titulo" => "Evidence of the efficacy of renal denervation in the treatment of resistant hypertension"
        ]
        9 => array:2 [
          "identificador" => "sec0030"
          "titulo" => "The Symplicity HTN studies"
        ]
        10 => array:2 [
          "identificador" => "sec0035"
          "titulo" => "Discussion"
        ]
        11 => array:2 [
          "identificador" => "sec0040"
          "titulo" => "The future"
        ]
        12 => array:2 [
          "identificador" => "sec0045"
          "titulo" => "Conclusions"
        ]
        13 => array:2 [
          "identificador" => "sec0050"
          "titulo" => "Conflicts of interest"
        ]
        14 => array:1 [
          "titulo" => "References"
        ]
      ]
    ]
    "pdfFichero" => "main.pdf"
    "tienePdf" => true
    "fechaRecibido" => "2015-12-26"
    "fechaAceptado" => "2016-06-06"
    "PalabrasClave" => array:2 [
      "en" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Keywords"
          "identificador" => "xpalclavsec744948"
          "palabras" => array:4 [
            0 => "Hypertension"
            1 => "Resistant hypertension"
            2 => "Renal denervation"
            3 => "Sympathetic nervous system"
          ]
        ]
      ]
      "pt" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Palavras-chave"
          "identificador" => "xpalclavsec744947"
          "palabras" => array:4 [
            0 => "Hipertens&#227;o"
            1 => "Hipertens&#227;o arterial resistente"
            2 => "Desnerva&#231;&#227;o renal"
            3 => "Sistema nervoso simp&#225;tico"
          ]
        ]
      ]
    ]
    "tieneResumen" => true
    "resumen" => array:2 [
      "en" => array:2 [
        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Hypertension is one of the most common chronic clinical problems encountered by physicians&#46; The prevalence of resistant hypertension is estimated at 9&#37; in the US&#46; Patients with resistant hypertension have been shown to be at higher risk for adverse cardiovascular events&#44; hence the need for greater efforts in improving the treatment of hypertension&#46; The renal sympathetic nerves play an important role in the development of hypertension&#44; mediated via sodium and water retention&#44; increased renin release and alterations in renal blood flow&#46; The proximity of the afferent and efferent renal sympathetic nerves to the adventitia of the renal arteries suggested the feasibility of an endovascular&#44; selective&#44; minimally invasive approach to renal denervation&#59; a potential treatment option for resistant hypertension&#46; While the RAPID&#44; Reduce-HTN&#44; EnligHTN&#44; DENERHTN and Symplicity HTN-1 and -2 studies showed significant benefit of renal denervation in the treatment of resistant hypertension&#44; the results of Oslo RDN&#44; Prague-15 and Symplicity HTN-3 were not so favorable&#46; Future well-designed clinical trials are needed to ascertain the benefits or otherwise of renal denervation in treatment-resistant hypertension&#46;</p></span>"
      ]
      "pt" => array:2 [
        "titulo" => "Resumo"
        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">A hipertens&#227;o arterial &#233; um dos problemas cl&#237;nicos cr&#243;nicos mais frequentes&#46; Nos EUA a preval&#234;ncia de hipertens&#227;o arterial resistente est&#225; estimada em 9&#37;&#46; Os doentes com hipertens&#227;o resistente t&#234;m um maior risco de eventos cardiovasculares adversos&#44; o que justifica maiores esfor&#231;os na melhoria do tratamento da hipertens&#227;o&#46; A inerva&#231;&#227;o simp&#225;tica renal tem um papel importante no desenvolvimento da hipertens&#227;o&#44; mediada atrav&#233;s da reten&#231;&#227;o de s&#243;dio e &#225;gua&#44; com aumento da liberta&#231;&#227;o de renina e de altera&#231;&#245;es do fluxo sangu&#237;neo renal&#46; A anatomia da inerva&#231;&#227;o simp&#225;tica renal&#44; com os seus nervos aferentes e eferentes em rela&#231;&#227;o de proximidade com a advent&#237;cia&#44; permite uma abordagem endovascular&#44; seletiva e minimamente invasiva para a desnerva&#231;&#227;o renal&#44; e constitui uma op&#231;&#227;o de tratamento potencial para a hipertens&#227;o arterial resistente&#46; Enquanto os estudos RAPID&#44; <span class="elsevierStyleItalic">Reduce</span>-HTN&#44; EngliHTN&#44; DENERHTN e <span class="elsevierStyleItalic">Simplicity</span> HTN 1&#44;2 mostraram um benef&#237;cio significativo da desnerva&#231;&#227;o renal no tratamento da hipertens&#227;o arterial resistente&#44; os resultados dos estudos Oslo-RDN&#44; <span class="elsevierStyleItalic">Prague</span>-15 e <span class="elsevierStyleItalic">Simplicity</span> HTN 3 n&#227;o foram t&#227;o favor&#225;veis&#46; Ser&#227;o necess&#225;rios ensaios cl&#237;nicos bem estruturados para confirmar ou infirmar os potenciais benef&#237;cios da desnerva&#231;&#227;o renal no tratamento da hipertens&#227;o arterial resistente&#46;</p></span>"
      ]
    ]
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        "identificador" => "tbl0005"
        "etiqueta" => "Table 1"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "detalles" => array:1 [
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            "identificador" => "at1"
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        "tabla" => array:2 [
          "leyenda" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">ABPM&#58; ambulatory blood pressure monitoring&#59; AH&#58; antihypertensive&#59; BP&#58; blood pressure&#59; eGFR&#58; estimated glomerular filtration rate&#59; N&#47;A&#58; not applicable&#59; RDN&#58; renal denervation&#59; RF&#58; radiofrequency&#59; SSAHT&#58; standardized stepped-care antihypertensive treatment&#59; SD&#58; standard deviation&#46;</p>"
          "tablatextoimagen" => array:1 [
            0 => array:2 [
              "tabla" => array:1 [
                0 => """
                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Trial name&#47;year of publication&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Study design&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Baseline office and ambulatory BP &#40;mmHg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Mean no&#46; of AH drugs&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">&#37; of patients under aldosterone antagonists&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Ablation catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Study description&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Study endpoints&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Main findings&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">RAPID&#47;2014<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">32</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; multicenter&#44; single arm&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 181&#46;6&#177;20&#46;8&#47;95&#46;5&#177;15&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">OneShot&#8482; RF balloon catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">50 patients enrolled to receive percutaneous RF renal nerve ablation&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary endpoint&#58; rate of office SBP reduction &#8805;10 mmHg at 6 months in comparison to baseline&#46; Change in 24-hour ambulatory BP was also evaluated&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office and ambulatory BP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">REDUCE-HTN&#47;2014<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">33</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; non-randomized&#44; single arm&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 182&#177;18&#46;4&#47;100&#177;14&#46;0&#59; baseline ambulatory 153&#177;15&#46;1&#47;87&#177;13&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">&#62;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Vessix RF catheter &#40;Boston Scientific&#41;<br>Bipolar RF&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">146 patients enrolled to receive percutaneous RF renal nerve ablation&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary efficacy endpoints&#58; reductions in office and 24-hour ambulatory SBP and DBP at six months&#46; Acute and long-term safety&#44; with a focus on the renal artery and eGFR&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office and ambulatory BP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">EnligHTN&#47;2014<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; non-randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 176&#47;96&#59; baseline ambulatory 150&#47;83&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">4&#46;7&#177;1&#46;0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">6&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">EnligHTN multielectrode RF catheter &#40;St&#46; Jude Medical&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">46 patients enrolled to receive percutaneous RF renal nerve ablation using a multielectrode system&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary efficacy endpoint&#58; office BP change from baseline&#46; Primary safety objective&#58; the rate of adverse events&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reductions in office&#44; ambulatory and home BP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Oslo RDN&#47;2014<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">35</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 156&#47;91&#59; baseline ambulatory 152&#47;93&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">3&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">19 patients randomly assigned to RDN &#40;9&#41; or clinically adjusted drug treatment &#40;10&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary end-point&#58; change in office SBP from randomization to 6 months&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office SBP in patients assigned to clinically adjusted drug treatment&#59; no change in those assigned to RDN&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Prague-15&#47;2015<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">36</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 159&#177;19&#47;92&#177;14&#59; baseline ambulatory 149&#177;12&#47;86&#177;10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&#177;1&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">27&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">106 patients randomly assigned to RDN &#40;52&#41; or intensified pharmacotherapy &#40;54&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Efficacy of RDN assessed by 24-hour ABPM and office BP at 6 months&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in 24-hour ambulatory and office BP in both groups&#44; with no differences between groups&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">DENERHTN&#47; 2015<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity RF catheter<br>&#40;Medtronic&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">106 patients randomly assigned to RDN &#43; SSAHT &#40;53&#41; or SSAHT alone &#40;53&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary end-point&#58; change in daytime SBP assessed by ambulatory BPM&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in daytime SBP in patients assigned to RDN &#43; SSSAHT as compared to SSAHT alone&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Symplicity HTN-1&#47;2009<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; non-randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 177&#47;101 &#40;SD 20&#47;15&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">4&#46;7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">50 patients enrolled to receive percutaneous RF renal nerve ablation&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary endpoint&#58; change in office BP at 1&#44; 3&#44; 6&#44; 9&#44; and 12 months after procedure&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office BP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Symplicity HTN-2&#47;2010<a class="elsevierStyleCrossRefs" href="#bib0430"><span class="elsevierStyleSup">39&#44;40</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 178&#177;18&#47;97&#177;16&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&#177;1&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">19&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">106 patients randomly assigned to RDN &#40;52&#41; or medical treatment &#40;54&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary endpoint&#58; change in office-based measurement of SBP at 6 months&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office BP in patients treated with RDN compared with those treated with medical therapy&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Symplicity HTN-3&#47;2014<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">41</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&#44; blinded&#44; sham-controlled&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&#177;1&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">22&#46;5&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">535 patients randomly assigned to undergo RDN &#40;364&#41; or sham procedure &#40;171&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary endpoint&#58; change in office BP at 6 months&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">No significant difference in office BP between the two groups&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
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Review article
Renal denervation in the treatment of resistant hypertension: Dead, alive or surviving?
Desnervação renal no tratamento da hipertensão arterial resistente: morta, viva ou sobrevivendo?
Ahmad Al-Fakhouria,
Corresponding author
fakhouri_md@yahoo.com

Corresponding author.
, Nephertiti Efeovbokhanb, Rami Nakhlac, Rami N. Khouzamb
a Department of Medicine, Methodist South Hospital, Memphis, TN, United States
b Department of Medicine, Division of Cardiovascular Diseases, University of Tennessee Health Science Center, Memphis, TN, United States
c Ain Shams University School of Medicine, Cairo, Egypt
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Hypertension is one of the most common chronic clinical problems encountered by physicians&#46; Resistant hypertension is defined as systolic blood pressure &#40;BP&#41; &#8805;160 mmHg or &#40;&#8805;150 mmHg in patients with type 2 diabetes mellitus&#41; refractory to medical treatment despite the use of optimal doses of three or more different drug types including a diuretic&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">1</span></a> The prevalence of resistant hypertension is estimated at 9&#37; in the US&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">2</span></a> In a study of 205<span class="elsevierStyleHsp" style=""></span>750 treated hypertensive patients&#44; 1 in 50 developed resistant hypertension within a median of 1&#46;5 years from the initial treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">3</span></a> In the same study&#44; patients with resistant hypertension were shown to be at higher risk for adverse cardiovascular events&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">3</span></a> The increased morbidity and mortality associated with this condition supports greater efforts to improve treatment options&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Historical perspective</span><p id="par0010" class="elsevierStylePara elsevierViewall">After a link was established between the sympathetic nervous system and the development of resistant hypertension&#44; surgical sympathectomy was introduced in the 1930s&#44; but was abandoned shortly afterwards due to multiple side effects such as postural hypotension&#44; tachycardia&#44; bladder&#44; bowel and erectile dysfunction&#44; and high periprocedural mortality&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">4</span></a> The proximity of the afferent and efferent renal sympathetic nerves to the adventitia of the renal arteries suggested the feasibility of an endovascular&#44; selective&#44; minimally invasive approach to renal denervation &#40;RDN&#41;&#46; In the endovascular approach&#44; a treatment catheter is introduced through a guiding catheter into the renal arteries&#46; The catheter is placed in close proximity to the vessel wall to ensure stable contact&#46; Low-energy radiofrequency ablations are then applied moving the catheter from distal to proximal locations in the renal arteries&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">5</span></a></p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Anatomical and physiological effects of renal denervation</span><p id="par0015" class="elsevierStylePara elsevierViewall">The renal nerves arise from T10-L2 and follow the course of the renal artery lying in the adventitia&#46; Renal sympathetic nerves play an important role in the development of hypertension&#44; mediated via sodium and water retention&#44; increased renin release&#44; and alterations in renal blood flow&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">5</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Experimental studies established the important concept that sub-vasoconstrictor levels of renal sympathetic activity can increase renin secretion and renal sodium retention without changing renal hemodynamics&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">6</span></a> Assessment of regional overflow of norepinephrine &#40;NE&#41; from the kidneys to plasma has demonstrated that renal NE spillover rates can be markedly elevated in patients with essential hypertension and are associated with hypertensive end-organ damage&#46;<a class="elsevierStyleCrossRefs" href="#bib0260"><span class="elsevierStyleSup">5&#44;31</span></a> Measurement of NE excretion in the urine&#44; now largely obsolete&#44; was performed in order to quantify sympathetic nervous system activity in humans&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">6</span></a> In the light of these findings&#44; RDN therapy was considered a logical therapeutic approach in the treatment of hypertension&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">The sympathetic nervous system and cardiovascular disease<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">7</span></a></span><p id="par0025" class="elsevierStylePara elsevierViewall">Surgical sympathectomy was first introduced in the 1930s and was effective in lowering high BP in patients with severe hypertension&#46;<a class="elsevierStyleCrossRefs" href="#bib0275"><span class="elsevierStyleSup">8&#44;9</span></a> However&#44; the side effects associated with the procedure and the introduction of ganglionic blockers made it obsolete&#46;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">10</span></a> For a long time&#44; it was difficult to study and assess the role of the sympathetic nervous system &#40;SNS&#41; in the pathogenesis of hypertension&#44; due not to uncertainty concerning the relation between the two&#44; but rather to the difficulty of testing and assessing that relation&#46; Previous techniques included the measurement of serum and urinary excretion of NE and its derivatives&#44; yielding a rough estimate of SNS activity in the whole body&#46;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">11</span></a> Hagbarth and Vallbo reported microneurography as a newer tool to study SNS nerve firing in subcutaneous tissues and skeletal muscles&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">12</span></a> The NE spillover technique was first used by Esler et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">13</span></a> measuring organ-specific NE release in its efferent veins as an indirect measurement of SNS nerve fiber firing in an individual organ&#44;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">14</span></a> and that technique was later used to demonstrate that heart failure caused SNS overactivity&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">15</span></a> Accumulated evidence underlines the role of sustained chronic SNS activity in many diseases including ischemic heart disease&#44;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">16</span></a> heart failure&#44;<a class="elsevierStyleCrossRefs" href="#bib0320"><span class="elsevierStyleSup">17&#44;18</span></a> hypertension&#44;<a class="elsevierStyleCrossRefs" href="#bib0330"><span class="elsevierStyleSup">19&#8211;21</span></a> kidney disease&#44;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">22</span></a> type 2 diabetes&#44;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">23</span></a> obesity&#44;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">23</span></a> metabolic syndrome&#44;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">23</span></a> obstructive sleep apnea&#44;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">24</span></a> depression&#44;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">25</span></a> and inflammatory bowel disease&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">26</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">In the cardiovascular system&#44; chronic SNS activation not only raises BP but also causes hypertrophy and proliferation of vascular smooth muscle cells and cardiac myocytes&#44; thus increasing LV mass and wall thickness&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">27</span></a> In addition&#44; increased SNS activity&#44; in the presence of endothelial dysfunction and endothelial cell damage&#44; has been shown to contribute to the development of atherosclerosis&#46;<a class="elsevierStyleCrossRefs" href="#bib0360"><span class="elsevierStyleSup">25&#44;27&#44;29</span></a> Contradicting previous assumptions&#44; high levels of NE spillover from the heart in heart failure<a class="elsevierStyleCrossRef" href="#bib0375"><span class="elsevierStyleSup">28</span></a> demonstrated increased sympathetic activity in the failing heart&#44; which was the rationale for the subsequent use of beta-blockers in heart failure&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">29</span></a> In essential hypertension&#44; SNS outflow to the kidneys is elevated and is directly proportional to the severity of hypertension&#46;<a class="elsevierStyleCrossRefs" href="#bib0330"><span class="elsevierStyleSup">19&#44;21&#44;25</span></a> This finding is also supported by regional measurements of NE spillover to the kidneys&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">30</span></a> Renal sympathetic activity is a major factor contributing to the pathogenesis of essential hypertension through its influence on activation of the renin-angiotensin system&#44; sodium and water excretion&#44; peripheral vasoconstriction&#44; cardiac contraction&#44; and venous capacitance&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">25</span></a> The recent introduction of safe and efficient methods for RDN has led to a renewed interest in the role of SNS activation in essential hypertension&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Evidence of the efficacy of renal denervation in the treatment of resistant hypertension</span><p id="par0035" class="elsevierStylePara elsevierViewall">The Rapid Renal Sympathetic Denervation for Resistant Hypertension Using the OneShot&#8482; Ablation System &#40;RAPID&#41; study<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">32</span></a> was a prospective&#44; multicenter&#44; non-randomized&#44; single-arm trial that included 50 patients with mean office BP of 181&#177;20&#46;8&#47;95&#177;15&#46;5 mmHg&#44; on a mean of five antihypertensive medications&#44; who received RDN&#46; The primary endpoint studied was the rate of office systolic BP &#40;SBP&#41; reduction&#58; &#8805;10 mmHg at six months in comparison to baseline&#46; Change in 24-hour ambulatory BP &#40;ABP&#41; was also evaluated&#46; At the six-month mark&#44; there was a decrease in mean office BP of -20&#47;-8 mmHg &#40;p&#60;0&#46;0001&#47;p&#61;0&#46;0002&#41; in comparison to baseline&#46; This trend was sustained at 12 months&#44; with a decrease in mean office BP of -22&#47;-8 mmHg &#40;p&#60;0&#46;0001&#47;p&#61;0&#46;0014&#41;&#46; Likewise&#44; there was a significant reduction in 24-hour ABP&#44; of -11&#47;-6 mmHg at six months in comparison to baseline &#40;p&#61;0&#46;0085&#47;p&#61;0&#46;037&#41;&#46; At 12 months&#44; the reduction in 24-hour ABP was -9&#47;-5 mmHg &#40;p&#61;0&#46;054&#47;p&#61;0&#46;073&#41;&#46; Device- and&#47;or procedure-related adverse effects occurred in three patients up to 12 months&#44; namely one access site infection&#44; one renal artery stenosis&#44; and one groin paresthesia&#46; The authors concluded that RDN led to significant and sustained reductions in office and 24-hour ambulatory BP at six and 12 months&#44; respectively&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">The REDUCE-HTN study<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">33</span></a> was a prospective&#44; non-randomized&#44; single-arm trial that included 146 patients with mean baseline office and ambulatory BP of 182&#177;18&#46;4&#47;100&#177;14&#46;0 and 153&#177;15&#46;1&#47;87&#177;13&#46;2 mmHg&#44; respectively&#44; who received RDN using the Vessix renal denervation system&#46; The primary efficacy endpoints were reductions in office and 24-hour ambulatory SBP and diastolic blood pressure &#40;DBP&#41; at six months&#44; which were 24&#46;7&#177;22&#46;1&#47;10&#46;3&#177;12&#46;7 mmHg &#40;p&#60;0&#46;0001&#41; and 8&#46;4&#177;14&#46;4&#47;5&#46;9&#177;9&#46;1 mmHg &#40;p&#60;0&#46;0001&#41;&#44; respectively&#46; Regarding the safety endpoints&#44; no acute renal injury requiring acute renal intervention occurred and only one patient developed renal artery stenosis that required a stent&#46; In addition&#44; mean glomerular filtration rate remained stable&#46; The authors concluded that renal artery denervation reduced both office and ambulatory BP at six months in patients with resistant hypertension&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">The EnligHTN I study<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a> was a prospective&#44; non-randomized trial that included 46 patients with mean baseline office&#44; 24-hour ambulatory and home BP of 176&#47;96&#44; 150&#47;83 and 158&#47;90 mmHg&#44; respectively&#44; who underwent RDN using the EnligHTN multielectrode radiofrequency ablation system&#46; The primary efficacy endpoint was change in office BP in comparison to baseline&#46; The mean reductions in office BP at 1&#44; 3&#44; 6&#44; and 12 months were -28&#47;-10&#44; -27&#47;-10&#44; -26&#47;-10&#44; and -27&#47;-11 mmHg&#44; respectively &#40;p&#60;0&#46;001 for all&#41;&#46; Likewise&#44; mean reductions in 24-hour ABP were -10&#47;-5&#44; -10&#47;-5&#44; and -10&#47;-6 mmHg at 1&#44; 3&#44; 6 months &#40;p&#60;0&#46;001 for all&#41;&#44; and -7&#47;-4 mmHg at 12 months &#40;p&#60;0&#46;0094&#41;&#46; Mean reductions in home measurements were -9&#47;-4&#44; -8&#47;-5&#44; -10&#47;-7&#44; and -11&#47;-6 mmHg &#40;p&#60;0&#46;001 at 12 months&#41;&#46; There were no signs of worsening renal function at 12 months&#46; One patient required renal artery stenting &#40;non-occlusive renal stenosis was present at baseline&#41;&#46; The authors concluded that the EnligHTN ablation system was safe and effective in reducing office&#44; 24-ambulatory and home BP in patients with resistant hypertension&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Oslo RDN<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">35</span></a> was a prospective randomized trial in which 19 patients with true treatment-resistant hypertension were randomized to RDN &#40;n&#61;9&#41; performed with the Symplicity Catheter System vs&#46; clinically adjusted drug treatment &#40;n&#61;10&#41;&#46; True treatment-resistant hypertension was confirmed after excluding patients with confounding poor drug adherence&#46; The primary endpoint was change in office systolic blood pressure &#40;SBP&#41; from randomization to six months&#46; The study was stopped early as RDN had uncertain BP-lowering effects&#46; At six months&#44; office SBP and DBP changed significantly from 160&#177;14&#47;88&#177;13 mmHg to 132&#177;10&#47;77&#177;8 mmHg compared to baseline in the drug-adjusted group &#40;p&#60;0&#46;0005 and p&#61;0&#46;02&#41;&#44; whereas in the RDN group there was no significant change in office SBP and DBP at six months compared to baseline &#40;156&#177;13&#47;91&#177;15 to 148&#177;7&#47;89&#177;8 mmHg&#44; p&#61;0&#46;42 and p&#61;0&#46;48&#41;&#46; SBP and DBP were significantly lower in the drug-adjusted group at six months &#40;p&#61;0&#46;002 and p&#61;0&#46;004&#44; respectively&#41;&#44; and absolute changes in SBP were larger in the drug-adjusted group &#40;p&#61;0&#46;008&#41;&#46; ABP changed in parallel to office BP&#46; The authors concluded that the BP-lowering effect of adjusted drug treatment were superior to that of RDN in patients with true treatment-resistant hypertension&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The Prague-15 study<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">36</span></a> was a prospective&#44; open-label multicenter trial in which 106 patients with resistant hypertension were randomized to RDN &#40;n&#61;52&#41; or intensified pharmacological treatment &#40;n&#61;54&#41;&#46; RDN was performed using the Symplicity Renal Denervation System&#46; At six months&#44; a comparable significant reduction in mean 24-hour SBP was noted in both groups&#44; of -8&#46;6 mmHg &#40;95&#37; confidence interval &#91;CI&#93;&#58; -11&#46;8&#44; -5&#46;3&#41;&#59; p&#60;0&#46;001 in RDN&#44; vs&#46; -8&#46;1 &#40;95&#37; CI&#58; -12&#46;7&#44; -3&#46;4&#41; mmHg in the pharmacological group&#46; Likewise&#44; a significant reduction in office SBP was observed in both groups mmHg &#40;-12&#46;4 &#91;95&#37; CI&#58; -17&#46;0&#44; -7&#46;8&#93;&#59; p&#60;0&#46;001 in RDN vs&#46; -14&#46;3 mmHg &#91;95&#37; CI&#58; -19&#46;7&#44; -8&#46;9&#93;&#59; p&#60;0&#46;001 in the pharmacological group&#41;&#46; The authors concluded that RDN was safe&#59; however in the setting of true resistant hypertension with confirmed compliance&#44; it was not proved superior to intensified pharmacological treatment&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">The DENERHTN trial<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a> was a prospective&#44; open-label randomized controlled trial that assigned 106 patients to receive either RDN plus a standardized stepped-care antihypertensive treatment &#40;SSAHT&#41; regimen &#40;RDN group&#44; n&#61;53&#41; or SSAHT alone &#40;control group&#44; n&#61;53&#41;&#46; Prior to randomization&#44; treatment resistance was confirmed by ABP monitoring after patients received oral antihypertensives for a period of four weeks&#46; The primary endpoint studied was the mean change in daytime SBP from baseline to six months as assessed by ambulatory BP monitoring&#46; The safety outcomes were the incidence of acute adverse events of the RDN procedure and the change in estimated glomerular filtration rate from baseline to six months&#46; At six months&#44; the mean change in daytime ambulatory SBP was -15&#46;8 mmHg &#40;95&#37; CI -19&#46;7 to -11&#46;9&#41; in the RDN group and -9&#46;9 mmHg &#40;-13&#46;6 to -6&#46;2&#41; in the group receiving SSAHT alone&#44; a baseline-adjusted difference of -5&#46;9 mmHg &#40;-11&#46;3 to -0&#46;5&#59; p&#61;0&#46;0329&#41;&#46; The numbers of antihypertensive drugs and drug adherence at six months were similar between the two groups&#46; Three minor RDN-related adverse events were noted &#40;lumbar pain in two patients and mild groin hematoma in one patient&#41;&#46; The authors concluded that RDN plus SSAHT decreases ambulatory BP more than the same SSAHT alone at six months in patients with well-defined resistant hypertension&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">The Symplicity HTN studies</span><p id="par0065" class="elsevierStylePara elsevierViewall">The Symplicity HTN-1 study<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a> was a proof-of-principle trial of therapeutic renal sympathetic denervation&#46; The trial included 50 patients with resistant hypertension who received percutaneous radiofrequency catheter-based RDN using the Symplicity catheter&#44; with a one-year follow-up post procedure&#46; The primary endpoints were office BP and safety data before and at 1&#44; 3&#44; 6&#44; 9&#44; and 12 months after procedure&#46; Out of the 50 patients enrolled&#44; five were excluded for anatomical reasons&#46; Treated patients were on a mean of 4&#46;7 antihypertensive medications&#44; with baseline mean office BP of 177&#47;101 mmHg&#46; Office BP readings after the procedure were reduced by -14&#47;-10&#44; -21&#47;-10&#44; -22&#47;-11&#44; -24&#47;-11&#44; and -27&#47;-17 mmHg at 1&#44; 3&#44; 6&#44; 9&#44; and 12 months&#44; respectively&#46; In the five non-treated patients&#44; mean rise in office BP was &#43;3&#47;-2&#44; &#43;2&#47;&#43;3&#44; &#43;14&#47;&#43;9&#44; and &#43;26&#47;&#43;17 mmHg at 1&#44; 3&#44; 6&#44; and 9 months&#44; respectively&#46; The only reported complication was one intraprocedural renal artery dissection which occurred before radiofrequency energy delivery&#46; The authors concluded that catheter-based RDN leads to substantial and sustained BP reduction&#44; without serious adverse events&#44; in patients with resistant hypertension&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Following the success achieved in the Symplicity HTN-1 trial&#44; the Symplicity HTN-2 trial<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a> was designed to assess the effectiveness and safety of catheter-based RDN for BP reduction in patients with treatment-resistant hypertension&#46; A total of 106 patients with resistant hypertension were randomly assigned to either RDN with medical treatment &#40;treatment arm&#44; n&#61;52&#41; or medical treatment alone &#40;control arm&#44; n&#61;54&#41;&#46; The primary endpoint of the study was change in office-based measurement of SBP at six months&#46; At six months&#44; there was a significant reduction in office-based BP measurements in the treatment arm &#40;change of 32&#47;12 mmHg&#44; standard deviation &#91;SD&#93; 23&#47;11&#44; baseline of 178&#47;96 mmHg&#41;&#44; compared to the control arm &#40;change of 1&#47;0 mmHg&#44; SD 21&#47;10&#44; baseline of 178&#47;97 mmHg&#41;&#46; Between-group differences in BP at six months were 33&#47;11 mmHg &#40;p&#60;0&#46;0001&#41;&#46; Additionally&#44; at six months&#44; 41 &#40;84&#37;&#41; out of 49 patients in the treatment arm had a reduction in SBP of 10 mmHg or more&#44; compared with 18 &#40;35&#37;&#41; of 51 controls &#40;p&#60;0&#46;0001&#41;&#46; No serious procedural complications were noted&#46; The authors concluded that catheter-based RDN can safely be used to substantially reduce BP in treatment-resistant hypertensive patients&#46; Follow-up at 36 months in 40 of the 52 patients in the initial RDN group and at 30 months in 30 of 37 patients who crossed over and received RDN at six months<a class="elsevierStyleCrossRef" href="#bib0435"><span class="elsevierStyleSup">40</span></a> showed that SBP decreased by 34 mmHg &#40;95&#37; CI&#58; -40&#44; -27&#44; p&#60;0&#46;01&#41; and DBP decreased by 13 mmHg &#40;95&#37; CI&#58; -16&#44; -10&#44; p&#60;0&#46;01&#41; from a baseline of 184&#177;19&#47;99&#177;16 mmHg&#46; SBP and DBP reductions at 36 months for the initial RDN group was -33 mmHg &#40;95&#37; CI&#58; -40&#44; -25&#44; p&#60;0&#46;01&#41; and -14 mmHg &#40;95&#37; CI&#58; -17&#44; -10&#44; p&#60;0&#46;01&#41;&#44; respectively&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">In an attempt to further explore the robustness of RDN in the treatment of resistant hypertension&#44; the Symplicity HTN-3 trial<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">41</span></a> was conducted&#46; Unlike the previous two studies&#44; blinding and sham-control were added in the design of this trial&#46; A total of 535 patients with severe resistant hypertension receiving a stable antihypertensive regimen involving maximally tolerated doses of at least three drugs including a diuretic were randomly assigned in a 2&#58;1 ratio to undergo RDN &#40;n&#61;364&#41; or a sham procedure &#40;n&#61;171&#41;&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">The primary efficacy endpoint&#44; change in office SBP at six months&#44; was not significantly different between the two groups &#40;-14&#46;13&#177;23&#46;93 mmHg in the denervation group compared to -11&#46;74&#177;25&#46;94 mmHg in the sham-procedure group &#91;p&#60;0&#46;001 for both comparisons of the change from baseline&#93;&#44; a difference of -2&#46;39 mmHg &#91;95&#37; CI&#58; -6&#46;89 to 2&#46;12&#59; p&#61;0&#46;26 for superiority with a margin of 5 mm Hg&#93;&#41;&#46; Likewise&#44; for the secondary efficacy endpoint&#44; the change in mean 24-hour ambulatory SBP&#44; no between-group differences were noted -6&#46;75&#177;15&#46;11 mmHg in the denervation group and -4&#46;79&#177;17&#46;25 mmHg in the sham-procedure group&#44; for a difference of -1&#46;96 mmHg &#40;95&#37; CI&#58; -4&#46;97 to 1&#46;06&#59; p&#61;0&#46;98 for superiority with a margin of 2 mmHg&#41;&#46; The primary safety endpoint &#40;a composite of death&#44; end-stage renal disease&#44; an embolic event resulting in end-organ damage&#44; renovascular complications&#44; or hypertensive crisis within 30 days or new renal-artery stenosis of more than 70&#37; within six months&#41; was not significantly different between the two groups&#46; The authors concluded that their blinded trial did not show a significant reduction of SBP in patients with resistant hypertension six months after renal-artery denervation compared with a sham control&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a> shows a summary of trials of RDN&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Discussion</span><p id="par0090" class="elsevierStylePara elsevierViewall">The role of RDN in the treatment of resistant hypertension is still to be fully clarified&#46; While the results of the RAPID&#44; REDUCE-HTN&#44; EnligHTN&#44; Symplicity HTN-1 and -2&#44; and DENERHTN trials were positive&#44; this was not the case in the Oslo RDN&#44; Prague-15 and Symplicity HTN-3 trials&#46; The varying results may be explained by several factors&#46; Symplicity HTN-3&#44; the largest trial to date&#44; was also the only one that included a sham-control group&#46; As shown by Meissner et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">46</span></a> sham procedures may be associated with a significant positive response &#8211; the placebo effect &#8211; that could be misinterpreted as a real treatment effect&#46; Kandzari et al&#46;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">42</span></a> investigated potential reasons for the discordant results noted in Symplicity HTN-3&#46; Their findings showed that between randomization and the six-month endpoint&#44; 39&#37; of patients underwent medication changes involving alteration in both the dose and class of prescribed medications&#46; In addition&#44; African-Americans were more likely to be prescribed vasodilators than non-African-Americans in both study arms&#46; A total of 56&#37; of African-American sham patients and 46&#46;7&#37; of African-American RDN patients were receiving a vasodilator&#44; compared to 40&#46;5&#37; of non-African-American sham control patients and 33&#46;7&#37; of non-African-American RDN patients who were receiving a vasodilator at baseline&#46; African-Americans in the sham control study arm receiving a vasodilator showed an enormous decline in SBP &#40;-21&#46;9&#43;29&#46;1 mmHg&#41;&#44; which was not noted in the other subgroups&#46; This unexpectedly large SBP decline in African-American control patients may indicate a change in medical adherence or type of therapy in this specific group&#46; Likewise&#44; increasing number of ablations and energy delivery in a four-quadrant pattern was associated with greater reductions in office and ambulatory SBP and heart rate&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">The ablation catheters used in the above studies had some design features that are worthy of mention&#46; The EnligHTN denervation system is a unique multielectrode catheter that allows a predictable pattern of four simultaneous ablations&#46; The Vessix denervation system used in the REDUCE-HTN trial delivered bipolar radiofrequency energy as opposed to the monopolar radiofrequency energy delivered by the Symplicity denervation system &#40;used in the Symplicity HTN studies&#41;&#46; As suggested by Kandazari et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">42</span></a> differences in ablation energy may affect the efficacy of denervation therapy&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">The future</span><p id="par0100" class="elsevierStylePara elsevierViewall">Several trials are underway to investigate the role of RDN in specific patient populations such as those with chronic renal disease and moderate hypertension&#46;<a class="elsevierStyleCrossRefs" href="#bib0450"><span class="elsevierStyleSup">43&#8211;45</span></a></p><p id="par0105" class="elsevierStylePara elsevierViewall">The SPYRAL HTN Global Clinical Trial Program<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a> is a phased series of clinical trials designed to establish the efficacy of RDN therapy in patients with hypertension&#46; The SPYRAL HTN-OFF MED trial aims to confirm the basic hypothesis that RDN therapy lowers BP in patients with hypertension without treatment&#44; while the parallel SPYRAL HTN-ON MED trial is designed to assess the efficacy of RDN integrated with antihypertensive medications&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Conclusions</span><p id="par0110" class="elsevierStylePara elsevierViewall">The results of the RAPID&#44; REDUCE-HTN&#44; EnligHTN&#44; Symplicity HTN-1 and -2&#44; and DENERHTN trials suggested an important role for RDN in the treatment of resistant hypertension&#46; The results of the Oslo RDN&#44; Prague-15 and Symplicity HTN-3 suggested differently&#46; Of note&#44; all these studies showing favorable benefits of RDN were either non-randomized single-arm trials or randomized unblinded trials without a sham control group&#46; As shown by Meissner et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">46</span></a> sham procedures may be associated with a significant positive response &#8211; the placebo effect &#8211; that could be misinterpreted as a real treatment effect&#46; Symplicity HTN-3&#44; a well-designed randomized&#44; blinded&#44; sham control trial&#44; casts doubt on the benefits of RDN in the treatment of resistant hypertension&#46; The results of the Symplicity HTN-3 emphasize the need always to assess for a potential placebo effect by including sham control study groups when assessing the efficacy of new devices&#46; In addition&#44; future studies should ensure consistent medical therapy and delivery of radiofrequency ablation across treatment arms&#44; as post-hoc analysis showed these differences to be important in the neutral results noted in Symplicity HTN-3&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">Currently&#44; the role of RDN in addition to medical therapy in the treatment of resistant hypertension is still to be fully clarified&#46; Nevertheless&#44; RDN is certainly not dead&#44; but further well-designed clinical trials are needed to ascertain the benefits or otherwise of RDN in treatment-resistant hypertension&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Conflicts of interest</span><p id="par0120" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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          "titulo" => "Anatomical and physiological effects of renal denervation"
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          "titulo" => "The sympathetic nervous system and cardiovascular disease"
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          "titulo" => "Evidence of the efficacy of renal denervation in the treatment of resistant hypertension"
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          "titulo" => "The Symplicity HTN studies"
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    "fechaAceptado" => "2016-06-06"
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            1 => "Resistant hypertension"
            2 => "Renal denervation"
            3 => "Sympathetic nervous system"
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            0 => "Hipertens&#227;o"
            1 => "Hipertens&#227;o arterial resistente"
            2 => "Desnerva&#231;&#227;o renal"
            3 => "Sistema nervoso simp&#225;tico"
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Hypertension is one of the most common chronic clinical problems encountered by physicians&#46; The prevalence of resistant hypertension is estimated at 9&#37; in the US&#46; Patients with resistant hypertension have been shown to be at higher risk for adverse cardiovascular events&#44; hence the need for greater efforts in improving the treatment of hypertension&#46; The renal sympathetic nerves play an important role in the development of hypertension&#44; mediated via sodium and water retention&#44; increased renin release and alterations in renal blood flow&#46; The proximity of the afferent and efferent renal sympathetic nerves to the adventitia of the renal arteries suggested the feasibility of an endovascular&#44; selective&#44; minimally invasive approach to renal denervation&#59; a potential treatment option for resistant hypertension&#46; While the RAPID&#44; Reduce-HTN&#44; EnligHTN&#44; DENERHTN and Symplicity HTN-1 and -2 studies showed significant benefit of renal denervation in the treatment of resistant hypertension&#44; the results of Oslo RDN&#44; Prague-15 and Symplicity HTN-3 were not so favorable&#46; Future well-designed clinical trials are needed to ascertain the benefits or otherwise of renal denervation in treatment-resistant hypertension&#46;</p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">A hipertens&#227;o arterial &#233; um dos problemas cl&#237;nicos cr&#243;nicos mais frequentes&#46; Nos EUA a preval&#234;ncia de hipertens&#227;o arterial resistente est&#225; estimada em 9&#37;&#46; Os doentes com hipertens&#227;o resistente t&#234;m um maior risco de eventos cardiovasculares adversos&#44; o que justifica maiores esfor&#231;os na melhoria do tratamento da hipertens&#227;o&#46; A inerva&#231;&#227;o simp&#225;tica renal tem um papel importante no desenvolvimento da hipertens&#227;o&#44; mediada atrav&#233;s da reten&#231;&#227;o de s&#243;dio e &#225;gua&#44; com aumento da liberta&#231;&#227;o de renina e de altera&#231;&#245;es do fluxo sangu&#237;neo renal&#46; A anatomia da inerva&#231;&#227;o simp&#225;tica renal&#44; com os seus nervos aferentes e eferentes em rela&#231;&#227;o de proximidade com a advent&#237;cia&#44; permite uma abordagem endovascular&#44; seletiva e minimamente invasiva para a desnerva&#231;&#227;o renal&#44; e constitui uma op&#231;&#227;o de tratamento potencial para a hipertens&#227;o arterial resistente&#46; Enquanto os estudos RAPID&#44; <span class="elsevierStyleItalic">Reduce</span>-HTN&#44; EngliHTN&#44; DENERHTN e <span class="elsevierStyleItalic">Simplicity</span> HTN 1&#44;2 mostraram um benef&#237;cio significativo da desnerva&#231;&#227;o renal no tratamento da hipertens&#227;o arterial resistente&#44; os resultados dos estudos Oslo-RDN&#44; <span class="elsevierStyleItalic">Prague</span>-15 e <span class="elsevierStyleItalic">Simplicity</span> HTN 3 n&#227;o foram t&#227;o favor&#225;veis&#46; Ser&#227;o necess&#225;rios ensaios cl&#237;nicos bem estruturados para confirmar ou infirmar os potenciais benef&#237;cios da desnerva&#231;&#227;o renal no tratamento da hipertens&#227;o arterial resistente&#46;</p></span>"
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          "leyenda" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">ABPM&#58; ambulatory blood pressure monitoring&#59; AH&#58; antihypertensive&#59; BP&#58; blood pressure&#59; eGFR&#58; estimated glomerular filtration rate&#59; N&#47;A&#58; not applicable&#59; RDN&#58; renal denervation&#59; RF&#58; radiofrequency&#59; SSAHT&#58; standardized stepped-care antihypertensive treatment&#59; SD&#58; standard deviation&#46;</p>"
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                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Trial name&#47;year of publication&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Study design&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Baseline office and ambulatory BP &#40;mmHg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Mean no&#46; of AH drugs&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">&#37; of patients under aldosterone antagonists&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Ablation catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Study description&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Study endpoints&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Main findings&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">RAPID&#47;2014<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">32</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; multicenter&#44; single arm&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 181&#46;6&#177;20&#46;8&#47;95&#46;5&#177;15&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">OneShot&#8482; RF balloon catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">50 patients enrolled to receive percutaneous RF renal nerve ablation&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary endpoint&#58; rate of office SBP reduction &#8805;10 mmHg at 6 months in comparison to baseline&#46; Change in 24-hour ambulatory BP was also evaluated&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office and ambulatory BP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">REDUCE-HTN&#47;2014<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">33</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; non-randomized&#44; single arm&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 182&#177;18&#46;4&#47;100&#177;14&#46;0&#59; baseline ambulatory 153&#177;15&#46;1&#47;87&#177;13&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">&#62;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Vessix RF catheter &#40;Boston Scientific&#41;<br>Bipolar RF&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">146 patients enrolled to receive percutaneous RF renal nerve ablation&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary efficacy endpoints&#58; reductions in office and 24-hour ambulatory SBP and DBP at six months&#46; Acute and long-term safety&#44; with a focus on the renal artery and eGFR&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office and ambulatory BP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">EnligHTN&#47;2014<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; non-randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 176&#47;96&#59; baseline ambulatory 150&#47;83&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">4&#46;7&#177;1&#46;0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">6&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">EnligHTN multielectrode RF catheter &#40;St&#46; Jude Medical&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">46 patients enrolled to receive percutaneous RF renal nerve ablation using a multielectrode system&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary efficacy endpoint&#58; office BP change from baseline&#46; Primary safety objective&#58; the rate of adverse events&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reductions in office&#44; ambulatory and home BP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Oslo RDN&#47;2014<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">35</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 156&#47;91&#59; baseline ambulatory 152&#47;93&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">3&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">19 patients randomly assigned to RDN &#40;9&#41; or clinically adjusted drug treatment &#40;10&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary end-point&#58; change in office SBP from randomization to 6 months&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office SBP in patients assigned to clinically adjusted drug treatment&#59; no change in those assigned to RDN&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Prague-15&#47;2015<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">36</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 159&#177;19&#47;92&#177;14&#59; baseline ambulatory 149&#177;12&#47;86&#177;10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&#177;1&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">27&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">106 patients randomly assigned to RDN &#40;52&#41; or intensified pharmacotherapy &#40;54&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Efficacy of RDN assessed by 24-hour ABPM and office BP at 6 months&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in 24-hour ambulatory and office BP in both groups&#44; with no differences between groups&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">DENERHTN&#47; 2015<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity RF catheter<br>&#40;Medtronic&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">106 patients randomly assigned to RDN &#43; SSAHT &#40;53&#41; or SSAHT alone &#40;53&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary end-point&#58; change in daytime SBP assessed by ambulatory BPM&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in daytime SBP in patients assigned to RDN &#43; SSSAHT as compared to SSAHT alone&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Symplicity HTN-1&#47;2009<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; non-randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 177&#47;101 &#40;SD 20&#47;15&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">4&#46;7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">50 patients enrolled to receive percutaneous RF renal nerve ablation&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary endpoint&#58; change in office BP at 1&#44; 3&#44; 6&#44; 9&#44; and 12 months after procedure&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office BP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Symplicity HTN-2&#47;2010<a class="elsevierStyleCrossRefs" href="#bib0430"><span class="elsevierStyleSup">39&#44;40</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Baseline office 178&#177;18&#47;97&#177;16&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&#177;1&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">19&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">106 patients randomly assigned to RDN &#40;52&#41; or medical treatment &#40;54&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary endpoint&#58; change in office-based measurement of SBP at 6 months&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Significant reduction in office BP in patients treated with RDN compared with those treated with medical therapy&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Symplicity HTN-3&#47;2014<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">41</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Prospective&#44; randomized&#44; blinded&#44; sham-controlled&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">N&#47;A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">5&#46;1&#177;1&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">22&#46;5&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Symplicity single-electrode RF catheter&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">535 patients randomly assigned to undergo RDN &#40;364&#41; or sham procedure &#40;171&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Primary endpoint&#58; change in office BP at 6 months&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">No significant difference in office BP between the two groups&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Summary of trials of renal denervation&#46;</p>"
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Article information
ISSN: 21742049
Original language: English
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Idiomas
Revista Portuguesa de Cardiologia (English edition)
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