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with an important platelet component&#44; is considered to be the underpinning precipitating cause in the majority of NSTE-ACS cases&#44;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;4</span></a> it makes sense to start dual antiplatelet treatment as early as possible&#44; to prevent or limit irreversible cardiac damage due to bouts of intermittent ischemia occurring over time in the setting of NSTE-ACS&#46; In addition&#44; extensive experience of the acute risk of percutaneous coronary interventions &#40;PCI&#41;&#44; including the risk of acute stent thrombosis&#44; supports the idea that intraprocedural levels of platelet inhibition are directly related to outcomes&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par1060" class="elsevierStylePara elsevierViewall">One important caveat to this reasoning is that any decision to proceed to coronary artery bypass graft surgery &#40;CABG&#41; could expose pretreated patients to the risk of excessive bleeding&#46; From a clinical standpoint&#44; however&#44; early experience with clopidogrel in the CURE trial<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> also supported the concept of pretreatment&#46; In CURE&#44; of the 12<span class="elsevierStyleHsp" style=""></span>562 patients recruited&#44; 2072 underwent CABG&#44; with a median time from randomization to CABG of 25&#46;5 days&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> The time to CABG for those undergoing the procedure during the initial hospitalization was 12 days&#46; The primary outcome still occurred less in clopidogrel-treated &#40;14&#46;5&#37;&#41; than in placebo-treated &#40;16&#46;4&#37;&#41; patients undergoing CABG&#46; For those undergoing surgical revascularization during hospitalization&#44; 16&#46;4&#37; of placebo-treated and 13&#46;4&#37; of clopidogrel-treated patients experienced cardiovascular death&#44; myocardial infarction &#40;MI&#41;&#44; or stroke&#44;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> findings consistent with the treatment effect observed in the entire trial&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> Among patients undergoing CABG&#44; benefits were observed mainly before the procedure&#46; Therefore&#44; allocation to CABG treatment&#44; only possible after knowledge of coronary anatomy&#44; did not nullify the benefit of clopidogrel pretreatment&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">In PCI-CURE&#44;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> 2658 patients with NSTE-ACS undergoing PCI in the CURE study had been randomly assigned double-blind treatment with clopidogrel &#40;n&#61;1313&#41; or placebo &#40;n&#61;1345&#41;&#46; Patients were pretreated with aspirin and the study drug for a median of six days before PCI during the initial hospital admission&#44; and for a median of 10 days overall&#46; Fifty-nine &#40;4&#46;5&#37;&#41; patients in the clopidogrel group had the primary endpoint of death&#44; MI and stroke&#44; compared with 86 &#40;6&#46;4&#37;&#41; in the placebo group &#40;relative risk 0&#46;70 &#91;95&#37; CI 0&#46;50-0&#46;97&#93;&#44; p&#61;0&#46;03&#41;&#44; further indicating the benefit associated with clopidogrel pretreatment&#44; although the study design could not discriminate between the effect of adding clopidogrel vs&#46; the effect of clopidogrel pretreatment vs&#46; no pretreatment&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">The CREDO trial<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> also corroborated the benefit of pretreatment&#46; In CREDO&#44; 2116 patients undergoing elective PCI were randomly allocated to clopidogrel loading &#40;300 mg&#41; or placebo 3-24 hours before PCI&#44; then all received clopidogrel 75 mg&#47;day through day 28&#46; Clopidogrel pretreatment did not significantly reduce the combined risk of death&#44; MI&#44; or urgent target vessel revascularization at 28 days&#46; However&#44; in a prespecified subgroup analysis&#44; patients who received clopidogrel at least six hours before PCI experienced a relative risk reduction of 38&#46;6&#37; for this endpoint compared with no reduction with treatment less than six hours before PCI&#44; with a non-significant increase in the risk of major bleeding&#46; Although performed in elective PCI&#44; these data support the view that some intraprocedural inhibition of the P2Y<span class="elsevierStyleInf">12</span> receptor is opportune&#44; in addition to aspirin&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Supporting evidence for pretreatment with a P2Y<span class="elsevierStyleInf">12</span> inhibitor also comes from experience with the intravenous P2Y<span class="elsevierStyleInf">12</span> inhibitor cangrelor in the setting of the CHAMPION PHOENIX trial&#44; in 11<span class="elsevierStyleHsp" style=""></span>145 patients who were undergoing either urgent or elective PCI&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">9</span></a> These patients were randomly allocated to receive a bolus and infusion of cangrelor or to receive a loading dose of 600 mg or 300 mg of clopidogrel&#44; the latter associated with considerably delayed effective P2Y<span class="elsevierStyleInf">12</span> inhibition&#46; Cangrelor significantly reduced the rate of ischemic events&#44; including stent thrombosis&#44;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">9</span></a> during PCI&#44; with no significant increase in severe bleeding&#46; All these data indicate that pretreatment&#44; defined as administration of P2Y<span class="elsevierStyleInf">12</span> inhibitors as early as possible in patients scheduled for an invasive approach&#44; both in an elective setting and for ACS&#44; is associated with a net clinical benefit compared with no pretreatment&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Subsequent to this body of evidence&#44; the results of the only ad-hoc randomized controlled trial on P2Y<span class="elsevierStyleInf">12</span> inhibitor pretreatment in NSTE-ACS&#44; the ACCOAST trial&#44; were published&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">10</span></a> ACCOAST compared pretreatment with prasugrel 30 mg and a further 30 mg dose prior to PCI with a regimen of prasugrel 60 mg after diagnostic angiography but prior to PCI among 4033 patients with NSTEMI scheduled for an early invasive strategy&#46; The median duration of pretreatment was 4&#46;3 hours&#46; Sixty-nine per cent of the patients underwent PCI&#44; 6&#37; required surgical revascularization and the remainder were treated conservatively&#46; At seven days&#44; patients randomized to the pretreatment arm experienced no reduction in the primary endpoint &#40;cardiovascular death&#44; recurrent MI&#44; stroke&#44; urgent revascularization and bailout use of glycoprotein IIb&#47;IIIa inhibitors&#41; &#40;hazard ratio 1&#46;02 &#91;95&#37; CI 0&#46;84-1&#46;25&#93;&#44; p&#61;0&#46;81&#41;&#44; and no benefits emerged at 30 days&#46; TIMI major bleeds were significantly increased in the pretreatment group at seven days &#40;pretreatment 2&#46;6&#37; vs&#46; no pretreatment 1&#46;4&#37;&#59; HR 1&#46;90 &#91;95&#37; CI 1&#46;19&#44; 3&#46;02&#93;&#44; p&#61;0&#46;006&#41;&#46; It has therefore been argued that pretreatment with any P2Y<span class="elsevierStyleInf">12</span> inhibitor is harmful &#40;because of excess bleeding&#41; and is not associated with any benefit in efficacy endpoints&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">11</span></a> The latest ESC guidelines on NSTE-ACS<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">12</span></a> do not recommend pretreatment with prasugrel&#44; based on ACCOAST&#44;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">11</span></a> and for the other two available oral P2Y<span class="elsevierStyleInf">12</span> inhibitors&#44; clopidogrel and ticagrelor&#44; advocate the cautionary position of no recommendation&#58; &#8220;As the optimal timing of ticagrelor or clopidogrel administration in NSTE-ACS patients scheduled for an invasive strategy has not been adequately investigated&#44; no recommendation for or against pretreatment with these agents can be formulated&#46; Based on the ACCOAST results&#44; pretreatment with prasugrel is not recommended&#46; In NSTE-ACS patients planned for conservative management&#44; P2Y<span class="elsevierStyleInf">12</span> inhibition &#40;preferably with ticagrelor&#41; is recommended&#44; in the absence of contraindications&#44; as soon as the diagnosis is confirmed&#46;&#8221;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">12</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">Although we recognize the lack of a specific ad-hoc trial with clopidogrel or ticagrelor&#44; we consider that the weight of evidence for clopidogrel or ticagrelor still favors pretreatment&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Concerns about the safety of any pretreatment are mostly based on the risk of bleeding with pretreatment in association with CABG&#46; However in ACCOAST&#44; the key safety endpoint of CABG- or non-CABG-related TIMI major bleeding showed an excess of 25 bleeding events in the pretreatment group&#44; with a number needed to harm of around 83&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">13</span></a> A pretreatment strategy based on either clopidogrel or ticagrelor&#44; with less intense or more reversible antiplatelet effects&#44; respectively&#44; might have dramatically reduced the bleeding hazard of pretreatment in the surgical cohort&#46; This category of patients is now rarely treated urgently with CABG without the possibility of some degree of reversal of platelet inhibition through partial discontinuation of antiplatelet treatment&#46; The now preferentially used radial approach&#44; associated with less periprocedural bleeding in PCI&#44; might also have reduced the bleeding risk in the non-surgical cohort&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">As to the lack of efficacy of pretreatment with prasugrel in ACCOAST&#44; this may well have resulted from the small differences in time of P2Y<span class="elsevierStyleInf">12</span> exposure in the two treatment arms&#46; The median pretreatment time was 4&#46;3 hours&#44; possibly too short an interval to allow detection of a difference in outcomes&#46; Considering that NSTE-ACS patients sometimes wait 24-48 hours or more before diagnostic angiography&#44; applying the results of ACCOAST to longer preprocedural times appears unwarranted&#46; Differences in the definition of MI in ACCOAST compared with other trials may also account for the apparent &#40;and quite surprising&#41; numerically higher rates of MI in the pretreatment vs&#46; no pretreatment arms of the trial&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">13</span></a> Significant pharmacokinetic and pharmacodynamic differences between the various P2Y<span class="elsevierStyleInf">12</span> inhibitors may also mean that labeling all their clinical effects as &#8220;class effects&#8221; is unwarranted&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">13</span></a> Finally&#44; the non-harmful and overall favorable results with ticagrelor pretreatment in STEMI in the setting of the ATLANTIC trial&#44; in which ticagrelor pretreatment&#44; with only a 31-minute difference between the pretreatment and no-pretreatment arms of the study&#44; was associated with a significantly lower rate of stent thrombosis &#40;0&#37; vs&#46; 0&#46;8&#37; in the first 24 hours&#59; 0&#46;2&#37; vs&#46; 1&#46;2&#37; at 30 days&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">14</span></a> also continues to support &#8211; in our opinion &#8211; the view that clopidogrel or ticagrelor pretreatment is also a wiser option compared with no pretreatment in the setting of NSTE-ACS&#44; especially when PCI is performed with a delay of hours and sometimes days after the clinical presentation&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">In conclusion&#44; on the basis of the ACCOAST study&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">10</span></a> unlike clopidogrel and ticagrelor&#44; prasugrel should be now confined to patients undergoing PCI&#44; and this therapy should be implemented only immediately before PCI&#46; For the time being&#44; the lack of ischemic benefit noted with prasugrel pretreatment should not undermine the better-established value of early dual platelet inhibition in general in ACS patients or the value of other P2Y<span class="elsevierStyleInf">12</span> inhibitors in this setting&#46; More studies in contemporary practice scenarios would however certainly be welcome&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0055" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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Perspectives in Cardiology
Do we need P2Y12 inhibitor pretreatment in non-ST elevation acute coronary syndrome?
Precisamos do inibidor da P2Y12 como precarga na síndrome coronária aguda sem elevação do segmento ST?
Raffaele De Caterinaa,b,
Autor para correspondência
rdecater@unich.it

Corresponding author.
, Alessia Delli Veneric
a “G. d’Annunzio” University, Chieti-Pescara, Italy
b Fondazione “G. Monasterio”, Pisa, Italy
c “La Sapienza” University, Rome, Italy
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with an important platelet component&#44; is considered to be the underpinning precipitating cause in the majority of NSTE-ACS cases&#44;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;4</span></a> it makes sense to start dual antiplatelet treatment as early as possible&#44; to prevent or limit irreversible cardiac damage due to bouts of intermittent ischemia occurring over time in the setting of NSTE-ACS&#46; In addition&#44; extensive experience of the acute risk of percutaneous coronary interventions &#40;PCI&#41;&#44; including the risk of acute stent thrombosis&#44; supports the idea that intraprocedural levels of platelet inhibition are directly related to outcomes&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par1060" class="elsevierStylePara elsevierViewall">One important caveat to this reasoning is that any decision to proceed to coronary artery bypass graft surgery &#40;CABG&#41; could expose pretreated patients to the risk of excessive bleeding&#46; From a clinical standpoint&#44; however&#44; early experience with clopidogrel in the CURE trial<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> also supported the concept of pretreatment&#46; In CURE&#44; of the 12<span class="elsevierStyleHsp" style=""></span>562 patients recruited&#44; 2072 underwent CABG&#44; with a median time from randomization to CABG of 25&#46;5 days&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> The time to CABG for those undergoing the procedure during the initial hospitalization was 12 days&#46; The primary outcome still occurred less in clopidogrel-treated &#40;14&#46;5&#37;&#41; than in placebo-treated &#40;16&#46;4&#37;&#41; patients undergoing CABG&#46; For those undergoing surgical revascularization during hospitalization&#44; 16&#46;4&#37; of placebo-treated and 13&#46;4&#37; of clopidogrel-treated patients experienced cardiovascular death&#44; myocardial infarction &#40;MI&#41;&#44; or stroke&#44;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> findings consistent with the treatment effect observed in the entire trial&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> Among patients undergoing CABG&#44; benefits were observed mainly before the procedure&#46; Therefore&#44; allocation to CABG treatment&#44; only possible after knowledge of coronary anatomy&#44; did not nullify the benefit of clopidogrel pretreatment&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">In PCI-CURE&#44;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> 2658 patients with NSTE-ACS undergoing PCI in the CURE study had been randomly assigned double-blind treatment with clopidogrel &#40;n&#61;1313&#41; or placebo &#40;n&#61;1345&#41;&#46; Patients were pretreated with aspirin and the study drug for a median of six days before PCI during the initial hospital admission&#44; and for a median of 10 days overall&#46; Fifty-nine &#40;4&#46;5&#37;&#41; patients in the clopidogrel group had the primary endpoint of death&#44; MI and stroke&#44; compared with 86 &#40;6&#46;4&#37;&#41; in the placebo group &#40;relative risk 0&#46;70 &#91;95&#37; CI 0&#46;50-0&#46;97&#93;&#44; p&#61;0&#46;03&#41;&#44; further indicating the benefit associated with clopidogrel pretreatment&#44; although the study design could not discriminate between the effect of adding clopidogrel vs&#46; the effect of clopidogrel pretreatment vs&#46; no pretreatment&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">The CREDO trial<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> also corroborated the benefit of pretreatment&#46; In CREDO&#44; 2116 patients undergoing elective PCI were randomly allocated to clopidogrel loading &#40;300 mg&#41; or placebo 3-24 hours before PCI&#44; then all received clopidogrel 75 mg&#47;day through day 28&#46; Clopidogrel pretreatment did not significantly reduce the combined risk of death&#44; MI&#44; or urgent target vessel revascularization at 28 days&#46; However&#44; in a prespecified subgroup analysis&#44; patients who received clopidogrel at least six hours before PCI experienced a relative risk reduction of 38&#46;6&#37; for this endpoint compared with no reduction with treatment less than six hours before PCI&#44; with a non-significant increase in the risk of major bleeding&#46; Although performed in elective PCI&#44; these data support the view that some intraprocedural inhibition of the P2Y<span class="elsevierStyleInf">12</span> receptor is opportune&#44; in addition to aspirin&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Supporting evidence for pretreatment with a P2Y<span class="elsevierStyleInf">12</span> inhibitor also comes from experience with the intravenous P2Y<span class="elsevierStyleInf">12</span> inhibitor cangrelor in the setting of the CHAMPION PHOENIX trial&#44; in 11<span class="elsevierStyleHsp" style=""></span>145 patients who were undergoing either urgent or elective PCI&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">9</span></a> These patients were randomly allocated to receive a bolus and infusion of cangrelor or to receive a loading dose of 600 mg or 300 mg of clopidogrel&#44; the latter associated with considerably delayed effective P2Y<span class="elsevierStyleInf">12</span> inhibition&#46; Cangrelor significantly reduced the rate of ischemic events&#44; including stent thrombosis&#44;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">9</span></a> during PCI&#44; with no significant increase in severe bleeding&#46; All these data indicate that pretreatment&#44; defined as administration of P2Y<span class="elsevierStyleInf">12</span> inhibitors as early as possible in patients scheduled for an invasive approach&#44; both in an elective setting and for ACS&#44; is associated with a net clinical benefit compared with no pretreatment&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Subsequent to this body of evidence&#44; the results of the only ad-hoc randomized controlled trial on P2Y<span class="elsevierStyleInf">12</span> inhibitor pretreatment in NSTE-ACS&#44; the ACCOAST trial&#44; were published&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">10</span></a> ACCOAST compared pretreatment with prasugrel 30 mg and a further 30 mg dose prior to PCI with a regimen of prasugrel 60 mg after diagnostic angiography but prior to PCI among 4033 patients with NSTEMI scheduled for an early invasive strategy&#46; The median duration of pretreatment was 4&#46;3 hours&#46; Sixty-nine per cent of the patients underwent PCI&#44; 6&#37; required surgical revascularization and the remainder were treated conservatively&#46; At seven days&#44; patients randomized to the pretreatment arm experienced no reduction in the primary endpoint &#40;cardiovascular death&#44; recurrent MI&#44; stroke&#44; urgent revascularization and bailout use of glycoprotein IIb&#47;IIIa inhibitors&#41; &#40;hazard ratio 1&#46;02 &#91;95&#37; CI 0&#46;84-1&#46;25&#93;&#44; p&#61;0&#46;81&#41;&#44; and no benefits emerged at 30 days&#46; TIMI major bleeds were significantly increased in the pretreatment group at seven days &#40;pretreatment 2&#46;6&#37; vs&#46; no pretreatment 1&#46;4&#37;&#59; HR 1&#46;90 &#91;95&#37; CI 1&#46;19&#44; 3&#46;02&#93;&#44; p&#61;0&#46;006&#41;&#46; It has therefore been argued that pretreatment with any P2Y<span class="elsevierStyleInf">12</span> inhibitor is harmful &#40;because of excess bleeding&#41; and is not associated with any benefit in efficacy endpoints&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">11</span></a> The latest ESC guidelines on NSTE-ACS<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">12</span></a> do not recommend pretreatment with prasugrel&#44; based on ACCOAST&#44;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">11</span></a> and for the other two available oral P2Y<span class="elsevierStyleInf">12</span> inhibitors&#44; clopidogrel and ticagrelor&#44; advocate the cautionary position of no recommendation&#58; &#8220;As the optimal timing of ticagrelor or clopidogrel administration in NSTE-ACS patients scheduled for an invasive strategy has not been adequately investigated&#44; no recommendation for or against pretreatment with these agents can be formulated&#46; Based on the ACCOAST results&#44; pretreatment with prasugrel is not recommended&#46; In NSTE-ACS patients planned for conservative management&#44; P2Y<span class="elsevierStyleInf">12</span> inhibition &#40;preferably with ticagrelor&#41; is recommended&#44; in the absence of contraindications&#44; as soon as the diagnosis is confirmed&#46;&#8221;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">12</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">Although we recognize the lack of a specific ad-hoc trial with clopidogrel or ticagrelor&#44; we consider that the weight of evidence for clopidogrel or ticagrelor still favors pretreatment&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Concerns about the safety of any pretreatment are mostly based on the risk of bleeding with pretreatment in association with CABG&#46; However in ACCOAST&#44; the key safety endpoint of CABG- or non-CABG-related TIMI major bleeding showed an excess of 25 bleeding events in the pretreatment group&#44; with a number needed to harm of around 83&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">13</span></a> A pretreatment strategy based on either clopidogrel or ticagrelor&#44; with less intense or more reversible antiplatelet effects&#44; respectively&#44; might have dramatically reduced the bleeding hazard of pretreatment in the surgical cohort&#46; This category of patients is now rarely treated urgently with CABG without the possibility of some degree of reversal of platelet inhibition through partial discontinuation of antiplatelet treatment&#46; The now preferentially used radial approach&#44; associated with less periprocedural bleeding in PCI&#44; might also have reduced the bleeding risk in the non-surgical cohort&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">As to the lack of efficacy of pretreatment with prasugrel in ACCOAST&#44; this may well have resulted from the small differences in time of P2Y<span class="elsevierStyleInf">12</span> exposure in the two treatment arms&#46; The median pretreatment time was 4&#46;3 hours&#44; possibly too short an interval to allow detection of a difference in outcomes&#46; Considering that NSTE-ACS patients sometimes wait 24-48 hours or more before diagnostic angiography&#44; applying the results of ACCOAST to longer preprocedural times appears unwarranted&#46; Differences in the definition of MI in ACCOAST compared with other trials may also account for the apparent &#40;and quite surprising&#41; numerically higher rates of MI in the pretreatment vs&#46; no pretreatment arms of the trial&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">13</span></a> Significant pharmacokinetic and pharmacodynamic differences between the various P2Y<span class="elsevierStyleInf">12</span> inhibitors may also mean that labeling all their clinical effects as &#8220;class effects&#8221; is unwarranted&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">13</span></a> Finally&#44; the non-harmful and overall favorable results with ticagrelor pretreatment in STEMI in the setting of the ATLANTIC trial&#44; in which ticagrelor pretreatment&#44; with only a 31-minute difference between the pretreatment and no-pretreatment arms of the study&#44; was associated with a significantly lower rate of stent thrombosis &#40;0&#37; vs&#46; 0&#46;8&#37; in the first 24 hours&#59; 0&#46;2&#37; vs&#46; 1&#46;2&#37; at 30 days&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">14</span></a> also continues to support &#8211; in our opinion &#8211; the view that clopidogrel or ticagrelor pretreatment is also a wiser option compared with no pretreatment in the setting of NSTE-ACS&#44; especially when PCI is performed with a delay of hours and sometimes days after the clinical presentation&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">In conclusion&#44; on the basis of the ACCOAST study&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">10</span></a> unlike clopidogrel and ticagrelor&#44; prasugrel should be now confined to patients undergoing PCI&#44; and this therapy should be implemented only immediately before PCI&#46; For the time being&#44; the lack of ischemic benefit noted with prasugrel pretreatment should not undermine the better-established value of early dual platelet inhibition in general in ACS patients or the value of other P2Y<span class="elsevierStyleInf">12</span> inhibitors in this setting&#46; More studies in contemporary practice scenarios would however certainly be welcome&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0055" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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Informação do artigo
ISSN: 08702551
Idioma original: Inglês
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