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and 4308 for ST-elevation MI&#44; an increase of 7&#46;8&#37; and 8&#46;6&#37;&#44; respectively&#44; compared to 2009&#46; Primary percutaneous coronary intervention &#40;PCI&#41; was the method of reperfusion in 2838 patients&#44; 10&#46;9&#37; more than in the previous year&#46; In 2009&#44; there were 12<span class="elsevierStyleHsp" style=""></span>318 PCI procedures &#8211; 6&#46;6&#37; more than in 2009 &#8211; in which 15<span class="elsevierStyleHsp" style=""></span>122 stents were implanted&#44; 10<span class="elsevierStyleHsp" style=""></span>590 of them drug-eluting&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Acute coronary syndromes &#40;ACS&#41; require intensive treatment in the acute phase to alleviate myocardial ischemia and to prevent adverse events such as death&#44; &#40;re&#41;infarction and potentially fatal arrhythmias&#46; After clinical stabilization and hospital discharge&#44; these patients still have relatively high rates of thrombotic complications&#44; and thus intensive therapy needs to be maintained in the chronic phase&#46; Recurrence of ACS&#44; which can be fatal&#44; in the weeks or months following discharge can have at least two causes&#46; Firstly&#44; intracoronary ultrasound studies show that most patients with ACS have at least two simultaneous plaque ruptures&#44; and some have ruptured plaques in all three coronary arteries&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> Consequently&#44; a focal therapeutic approach aimed at treating the culprit lesion&#44; which can often be achieved by PCI&#44; does not remove the risk of short-term recurrence of instability due to other highly vulnerable plaques&#46; Secondly&#44; ACS are characterized by inflammation and oxidative stress&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> In inflammatory states&#44; circulating monocytes produce thromboxane A2 from arachidonic acid via the cyclooxygenase-2 pathway&#44; 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because the ratio between the recommended clopidogrel dose and the minimum dose required to obtain its maximum pharmacodynamic effect is around one&#44; which means that the usual dose only partially inhibits P2Y<span class="elsevierStyleInf">12</span> receptors&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a> shows the sequence of events required to achieve the desired therapeutic effect of any drug&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0040" class="elsevierStylePara elsevierViewall">Many factors affect the response to clopidogrel&#44; some of which have been the subject of considerable research&#44; particularly polymorphisms in the <span class="elsevierStyleItalic">ABCB1</span> gene&#44; which codes for P-glycoprotein &#40;an efflux pump in the intestinal epithelium that returns absorbed drugs to the intestinal lumen&#44; thereby reducing their bioavailability&#41;&#44; and in the gene that codes for the 2C19 isoenzyme of cytochrome P450 &#40;CYP2C19&#41;&#44; which is important for the activation of clopidogrel&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> Clopidogrel is a prodrug&#44; and its activation is complex &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Figure 2</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> Some 85&#37; of the dose administered is hydrolyzed in the liver&#44; where it is converted into an inactive metabolite &#40;SR 26334&#41;&#59; the remainder is metabolized by CYP2C19 and to a lesser degree by CYP1A2 and CYP2B6 to 2-oxo-clopidogrel&#46; Around half of this metabolite&#44; which is also inactive&#44; is hydrolyzed and converted into an inactive thiolactone&#44; while the other half is metabolized by the 3A4&#44; 3A5&#44; 2B6&#44; 2C9 and 2C19 isoenzymes&#44; finally producing the active metabolite &#40;R-130964&#41;&#46; The fact that a significant proportion of the absorbed drug is wasted &#40;converted to inactive metabolites&#41;&#44; the complex activation of the prodrug requiring two oxidation steps&#44; and its heavy dependence on the function of the CYP2C19 isoenzyme &#40;which is involved in the metabolization of numerous drugs and whose reduced-function genetic variants have a prevalence of around 25&#37;&#41;&#44; are the main pharmacokinetic factors affecting the variability of response to clopidogrel&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0045" class="elsevierStylePara elsevierViewall">The article by Teixeira et al&#46; published in this issue of the <span class="elsevierStyleItalic">Journal</span> confirms the prognostic impact of reduced-function CYP2C19 variants in a Portuguese population&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> The authors found these variants in 27&#37; of a sample of 95 patients who survived ACS and were medicated with clopidogrel&#46; Despite the study&#39;s limitations &#40;particularly the small sample size&#41;&#44; its main findings are in agreement with those of several other analyses&#46; Recent studies suggest that reduced-function CYP2C19 variants are clinically relevant only in patients undergoing PCI with stenting&#44; in whom they are associated with greater risk for MI and stent thrombosis&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">The question thus arises as to how to optimize platelet inhibition in ACS&#46; Should platelet response to clopidogrel be tested&#63; Should genetic variants that affect clopidogrel response be screened for&#63; What should be done in the presence of weak platelet inhibition or a reduced-function genetic variant&#63; Would it be better to use one of the new P2Y<span class="elsevierStyleInf">12</span> receptor antagonists&#44; which provide faster&#44; stronger and more consistent platelet inhibition&#63; To put it another way&#44; do we need personalized antiplatelet therapy or better antiplatelet agents&#63;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The concept of personalized medicine has significant limitations&#46; It requires laboratory tests&#44; but the ideal tests have not been identified&#44; and existing tests lack standardization and clinical validation&#46; Furthermore&#44; a personalized approach to platelet therapy is a lengthy and costly process&#44; and will never be 100&#37; effective&#44; firstly because some patients&#44; when tested for response to clopidogrel&#44; still present high platelet reactivity even after a 2400-mg loading dose and 300-mg maintenance dose&#44;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">12&#44;13</span></a> and secondly&#44; because genetic variants in CYP2C19 explain only 12&#37; of the variability of response to clopidogrel&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a> In the study by Teixeira et al&#46;&#44; this may have contributed to the lack of impact of genotype on the results of platelet function tests&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">The future undoubtedly lies with the new P2Y<span class="elsevierStyleInf">12</span> receptor antagonists&#44; particularly prasugrel and ticagrelor&#46; These drugs are more effective than clopidogrel&#44; even when administered in doses above those recommended&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> In the TRITON-TIMI 38 trial&#44; in individuals with ACS with scheduled PCI&#44; prasugrel reduced major vascular events by 19&#37;&#44; but increased the risk of major bleeding&#59; the risk&#47;benefit ratio was better than for clopidogrel except in patients with a history of stroke or transient ischemic attack&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> In the PLATO trial&#44; ticagrelor reduced the incidence of major vascular events in patients with scheduled primary PCI or non-ST elevation ACS by 16&#37;&#59; it increased major bleeding risk compared to clopidogrel but did not increase risk for CABG-related bleeding&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> It is hoped that these new drugs will reduce the high thrombotic risk associated with ACS and contribute significantly to further decreases in mortality from ischemic heart disease&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Conflicts of interest</span><p id="par0065" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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Editorial comment
Platelet inhibition in acute coronary syndromes: A complex intervention that needs optimization
Inibição plaquetária nas síndromes coronárias agudas: uma intervenção complexa que deve ser otimizada
Carlos Aguiar
Serviço de Cardiologia, Hospital Santa Cruz, CHLO, Lisboa, Portugal
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Cardiovascular mortality has fallen in Portugal over the last decade&#44; but mortality from stroke has declined much more sharply than from ischemic heart disease&#46; Data from the European Commission show that from 1998&#8211;2000 to 2007&#8211;2009 mortality from stroke fell from 145&#46;2 to 78&#46;5 per 100<span class="elsevierStyleHsp" style=""></span>000 population&#44; while death from ischemic heart disease only decreased from 65&#46;7 to 44&#46;6 per 100<span class="elsevierStyleHsp" style=""></span>000 population &#40;age-adjusted rates&#41;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">According to the Portuguese National Coordinating Body for Cardiovascular Disease&#44; of the 18<span class="elsevierStyleHsp" style=""></span>075 patients admitted to cardiac care units during 2010&#44; 5320 were admitted for non-ST elevation myocardial infarction &#40;MI&#41; and 4308 for ST-elevation MI&#44; an increase of 7&#46;8&#37; and 8&#46;6&#37;&#44; respectively&#44; compared to 2009&#46; Primary percutaneous coronary intervention &#40;PCI&#41; was the method of reperfusion in 2838 patients&#44; 10&#46;9&#37; more than in the previous year&#46; In 2009&#44; there were 12<span class="elsevierStyleHsp" style=""></span>318 PCI procedures &#8211; 6&#46;6&#37; more than in 2009 &#8211; in which 15<span class="elsevierStyleHsp" style=""></span>122 stents were implanted&#44; 10<span class="elsevierStyleHsp" style=""></span>590 of them drug-eluting&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Acute coronary syndromes &#40;ACS&#41; require intensive treatment in the acute phase to alleviate myocardial ischemia and to prevent adverse events such as death&#44; &#40;re&#41;infarction and potentially fatal arrhythmias&#46; After clinical stabilization and hospital discharge&#44; these patients still have relatively high rates of thrombotic complications&#44; and thus intensive therapy needs to be maintained in the chronic phase&#46; Recurrence of ACS&#44; which can be fatal&#44; in the weeks or months following discharge can have at least two causes&#46; Firstly&#44; intracoronary ultrasound studies show that most patients with ACS have at least two simultaneous plaque ruptures&#44; and some have ruptured plaques in all three coronary arteries&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> Consequently&#44; a focal therapeutic approach aimed at treating the culprit lesion&#44; which can often be achieved by PCI&#44; does not remove the risk of short-term recurrence of instability due to other highly vulnerable plaques&#46; Secondly&#44; ACS are characterized by inflammation and oxidative stress&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> In inflammatory states&#44; circulating monocytes produce thromboxane A2 from arachidonic acid via the cyclooxygenase-2 pathway&#44; an extra-platelet source of thromboxane A2 that is not inhibited by low doses of aspirin&#46; In an oxidative environment&#44; prostanoids are produced by non-enzymatic peroxidation from arachidonic acid in the cell membrane and circulating low-density lipoproteins&#46; These increase platelet reactivity&#44; leading to activation even in the presence of subthreshold concentrations of agonists&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Platelets play a crucial role in the pathogenesis of ACS and their complications&#44; and a combination of antiplatelet agents with different therapeutic targets strengthens platelet inhibition&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> An important step in platelet activation is the release of granules containing adenosine phosphate &#40;ADP&#41;&#44; which binds to both the P2Y<span class="elsevierStyleInf">1</span> and P2Y<span class="elsevierStyleInf">12</span> receptors&#46; Unlike the P2Y<span class="elsevierStyleInf">1</span> receptor&#44; the P2Y<span class="elsevierStyleInf">12</span> receptor is found in few tissues and is thus a more promising therapeutic target&#46; It is the binding of ADP to the P2Y<span class="elsevierStyleInf">12</span> receptor that increases platelet activation&#59; inhibiting these receptors makes the thienopyridines more potent antiplatelet agents than aspirin&#44; since ADP enables platelet aggregation even with low concentrations of any platelet agonists&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">In the light of these mechanisms&#44; studies have demonstrated the superiority of dual platelet inhibition with aspirin and clopidogrel in non-ST elevation ACS as well as in ST-elevation MI&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5</span></a> The benefit of dual antiplatelet therapy is apparent after only 24<span class="elsevierStyleHsp" style=""></span>hours of treatment and is independent of baseline clinical characteristics and therapeutic approach &#40;with or without PCI&#41;&#46; The European Society of Cardiology accordingly recommends dual antiplatelet therapy with aspirin and a P2Y<span class="elsevierStyleInf">12</span> receptor antagonist for all ACS patients&#44; to be initiated as soon as possible and to be maintained for a year if bleeding risk permits&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Despite the considerable improvements due to dual antiplatelet therapy with aspirin and clopidogrel&#44; significant thrombotic risk remains in both the short and long term&#46; The existence of marked interindividual variability in response to clopidogrel indicates that this residual risk is modifiable to some extent&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> A weak response to clopidogrel is clinically relevant&#44; since it is associated with increased risk of cardiovascular death&#44; spontaneous MI&#44; type 4a MI&#44; stent thrombosis&#44; stroke and target lesion revascularization&#44;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> and it is common &#40;around a third of patients&#41;&#44; because the ratio between the recommended clopidogrel dose and the minimum dose required to obtain its maximum pharmacodynamic effect is around one&#44; which means that the usual dose only partially inhibits P2Y<span class="elsevierStyleInf">12</span> receptors&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a> shows the sequence of events required to achieve the desired therapeutic effect of any drug&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0040" class="elsevierStylePara elsevierViewall">Many factors affect the response to clopidogrel&#44; some of which have been the subject of considerable research&#44; particularly polymorphisms in the <span class="elsevierStyleItalic">ABCB1</span> gene&#44; which codes for P-glycoprotein &#40;an efflux pump in the intestinal epithelium that returns absorbed drugs to the intestinal lumen&#44; thereby reducing their bioavailability&#41;&#44; and in the gene that codes for the 2C19 isoenzyme of cytochrome P450 &#40;CYP2C19&#41;&#44; which is important for the activation of clopidogrel&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> Clopidogrel is a prodrug&#44; and its activation is complex &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Figure 2</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> Some 85&#37; of the dose administered is hydrolyzed in the liver&#44; where it is converted into an inactive metabolite &#40;SR 26334&#41;&#59; the remainder is metabolized by CYP2C19 and to a lesser degree by CYP1A2 and CYP2B6 to 2-oxo-clopidogrel&#46; Around half of this metabolite&#44; which is also inactive&#44; is hydrolyzed and converted into an inactive thiolactone&#44; while the other half is metabolized by the 3A4&#44; 3A5&#44; 2B6&#44; 2C9 and 2C19 isoenzymes&#44; finally producing the active metabolite &#40;R-130964&#41;&#46; The fact that a significant proportion of the absorbed drug is wasted &#40;converted to inactive metabolites&#41;&#44; the complex activation of the prodrug requiring two oxidation steps&#44; and its heavy dependence on the function of the CYP2C19 isoenzyme &#40;which is involved in the metabolization of numerous drugs and whose reduced-function genetic variants have a prevalence of around 25&#37;&#41;&#44; are the main pharmacokinetic factors affecting the variability of response to clopidogrel&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0045" class="elsevierStylePara elsevierViewall">The article by Teixeira et al&#46; published in this issue of the <span class="elsevierStyleItalic">Journal</span> confirms the prognostic impact of reduced-function CYP2C19 variants in a Portuguese population&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> The authors found these variants in 27&#37; of a sample of 95 patients who survived ACS and were medicated with clopidogrel&#46; Despite the study&#39;s limitations &#40;particularly the small sample size&#41;&#44; its main findings are in agreement with those of several other analyses&#46; Recent studies suggest that reduced-function CYP2C19 variants are clinically relevant only in patients undergoing PCI with stenting&#44; in whom they are associated with greater risk for MI and stent thrombosis&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">The question thus arises as to how to optimize platelet inhibition in ACS&#46; Should platelet response to clopidogrel be tested&#63; Should genetic variants that affect clopidogrel response be screened for&#63; What should be done in the presence of weak platelet inhibition or a reduced-function genetic variant&#63; Would it be better to use one of the new P2Y<span class="elsevierStyleInf">12</span> receptor antagonists&#44; which provide faster&#44; stronger and more consistent platelet inhibition&#63; To put it another way&#44; do we need personalized antiplatelet therapy or better antiplatelet agents&#63;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The concept of personalized medicine has significant limitations&#46; It requires laboratory tests&#44; but the ideal tests have not been identified&#44; and existing tests lack standardization and clinical validation&#46; Furthermore&#44; a personalized approach to platelet therapy is a lengthy and costly process&#44; and will never be 100&#37; effective&#44; firstly because some patients&#44; when tested for response to clopidogrel&#44; still present high platelet reactivity even after a 2400-mg loading dose and 300-mg maintenance dose&#44;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">12&#44;13</span></a> and secondly&#44; because genetic variants in CYP2C19 explain only 12&#37; of the variability of response to clopidogrel&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a> In the study by Teixeira et al&#46;&#44; this may have contributed to the lack of impact of genotype on the results of platelet function tests&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">The future undoubtedly lies with the new P2Y<span class="elsevierStyleInf">12</span> receptor antagonists&#44; particularly prasugrel and ticagrelor&#46; These drugs are more effective than clopidogrel&#44; even when administered in doses above those recommended&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> In the TRITON-TIMI 38 trial&#44; in individuals with ACS with scheduled PCI&#44; prasugrel reduced major vascular events by 19&#37;&#44; but increased the risk of major bleeding&#59; the risk&#47;benefit ratio was better than for clopidogrel except in patients with a history of stroke or transient ischemic attack&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> In the PLATO trial&#44; ticagrelor reduced the incidence of major vascular events in patients with scheduled primary PCI or non-ST elevation ACS by 16&#37;&#59; it increased major bleeding risk compared to clopidogrel but did not increase risk for CABG-related bleeding&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> It is hoped that these new drugs will reduce the high thrombotic risk associated with ACS and contribute significantly to further decreases in mortality from ischemic heart disease&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Conflicts of interest</span><p id="par0065" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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        "nota" => "<p class="elsevierStyleNotepara">Please cite this article as&#58; Inibi&#231;&#227;o Plaquet&#225;ria nas S&#237;ndromes Coron&#225;rias Agudas&#58; Uma Interven&#231;&#227;o Complexa que Deve Ser Optimizada&#46; Rev Port Cardiol 2012&#46; <span class="elsevierStyleInterRef" href="doi:10.1016/j.repc.2012.02.011">doi&#58;10&#46;1016&#47;j&#46;repc&#46;2012&#46;02&#46;011</span>&#46;</p>"
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ISSN: 21742049
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