PCI in The Patient With Resistance to Aspirin

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

## Contents

* 1 This Page is Under Construction
* 2 Overview
* 2.1 Clinical Trial Data
* 3 References
* 4 External links

## This Page is Under Construction

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## Overview

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The treatment for antiplatelet drug resistance is not well defined. Detailed patient evaluation and correcting possible clinical causes and factors may be the initial therapeutic steps. Careful drug choose to reduce possible interactions, optimizing blood glucose and cholesterol levels are also beneficial.[1]

Administration of higher doses of Aspirin is evaluated and currently not an actual therapeutic strategy for the lack of evidence demonstrating improvement in clinical outcomes. Increasing the dose of aspirin has been suggested as a measure to overcome aspirin resistance but it is possible that increased doses of aspirin may overcome aspirin resistance in vitro in an individual patient. Higher doses of aspirin may also increase bleeding events. [2] [3]

#### Clinical Trial Data

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CAPRIE study (Clopidogrel versus Aspirin in Patients at Risk of Ischemic Events)

Although, whether clopidogrel therapy is superior to aspirin in aspirin resistant patients is currently unknown, CAPRIE study investigators reported significant superiority of clopidogrel monotherapy over aspirin monotherapy. This beneficial effect was more frequently observed in high risk patients.

In fact, aspirin resistance is more frequent finding in high risk patients, such as diabetics and patients with diffuse atherosclerotic disease or acute coronary syndromes. [4] This group or patients also have increased risk of recurrent ischemic events [5] [6] [7] [8] [9]

ASCET trial (ASpirin non-responsiveness and Clopidogrel Endpoint Trial)

ISAR-REACT study (Intracoronary Stenting and Antithrombotic Regimen - Rapid Early Action for Coronary Treatment) data suggest that in patients at low to intermediate risk who undergo elective PCI after pretreatment with a high loading dose of clopidogrel, the use of a GP IIb/IIIa inhibitor, although more potent, is associated with no clinically measurable benefit within the first 30 days. In contrast, high-risk patients should receive triple antiplatelet therapy.

A low to medium risk patients study suggests that aspirin and clopidogrel may be insufficient in aspirin non responsive patients and resulted in quite similar results of ISAR-REACT. [10]

Both study results indicate that there is a gap between applied medication and requirements for optimal antiplatelet treatment. Most interventional cardiologists give aspirin, clopidogrel, and heparin alone before PCI, however, up to 25% of these patients are aspirin non responsive.

* RESISTOR trial (Research Evaluation to Study Individuals who Show Thromboxane Or P2Y12 Receptor Resistance)

## References

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1. ↑ Gum PA, Kottke-Marchant K, Welsh PA, White J, Topol EJ: A prospective, blinded determination of the natural history of aspirin resistance among stable patients with cardiovascular disease. J Am Coll Cardiol 2003, 41:961-5.
2. ↑ CAPRIE Steering Committee. A randomised, blinded, trial of clopidogrel versus aspirin in patients at risk of ischaemic events (CAPRIE). Lancet 1996; 348: 1329–39.
3. ↑ Lev EI, Patel RT, Maresh KJ et al. Aspirin and clopidogrel drug response in patients undergoing percutaneous coronary intervention: the role of dual drug resistance. J Am Coll Cardiol 2006; 47: 27–33.
4. ↑ Angiolillo DJ, Fernandez-Ortiz A, Bernardo E et al. Platelet function profiles in patients with type 2 diabetes and coronary artery disease on combined aspirin and clopidogrel treatment. Diabetes 2005; 54: 2430–5.
5. ↑ Eikelboom, JW, Hirsh J, Weitz JI et al. Aspirin resistant thromboxane biosynthesis and the risk of myocardial infarction, stroke, or cardiovascular death in patients at high risk for cardiovascular events. Circulation 2002; 105: 1650–5.
6. ↑ Rocca B, Patrono C. Determinants of the interindividual variability in response to antiplatelet drugs. J Thromb Haemost 2005; 3: 1597–602.
7. ↑ Matetzky S, Shenkman B, Guetta V et al. Clopidogrel resistance is associated with increased risk of recurrent atherothrombotic events in patients with acute myocardial infarction. Circulation 2004; 109: 3171–5.
8. ↑ Bernardo E, Angiolillo DJ, Ramirez C et al. Prevalence of concomitant suboptimal responsiveness to aspirin and clopidogrel treatment in diabetic patients. J Am Coll Cardiol 2006; 47 (Suppl A) 364A.
9. ↑ Antithrombotic Trialists' Collaboration: Collaborative meta-analysis of randomized trials of antiplatelet therapy for prevention of death, myocardial infarction, and stroke in high risk patients. BMJ 2002, 324:71-86.
10. ↑ Chen WH, Lee PY, Ng W et al. Aspirin resistance is associated with a high incidence of myonecrosis after non-urgent percutaneous coronary intervention despite clopidogrel pretreatment. J Am Coll Cardiol 2004; 43: 1122–6.

## External links

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* The MD TV: Comments on Hot Topics, State of the Art Presentations in Cardiovascular Medicine, Expert Reviews on Cardiovascular Research
* Clinical Trial Results: An up to dated resource of Cardiovascular Research

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