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Aspirin resistance: truth or dare.

Marie Lordkipanidzé1, Chantal Pharand, Donald A Palisaitis

  • 1Faculty of Pharmacy, Université de Montréal, Montréal, Canada.

Pharmacology & Therapeutics
|August 22, 2006
PubMed
Summary

Acetylsalicylic acid (aspirin) resistance varies greatly and is poorly understood. This review clarifies its definition, mechanisms, risk factors, and clinical impact in cardiovascular patients.

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Area of Science:

  • Cardiology
  • Pharmacology
  • Thrombosis

Background:

  • Acetylsalicylic acid (aspirin) is a cornerstone therapy for preventing cardiovascular events.
  • Individual responses to aspirin vary, leading to a phenomenon known as aspirin resistance.
  • The prevalence of aspirin resistance is highly variable (0.4-83%) and poorly understood.

Purpose of the Study:

  • To elucidate the challenges in defining aspirin resistance.
  • To explore the underlying mechanisms contributing to aspirin resistance.
  • To identify patient characteristics associated with increased risk of aspirin resistance.
  • To discuss the clinical implications of aspirin resistance in chronic aspirin therapy.

Main Methods:

  • Literature review and synthesis of existing research on aspirin resistance.
  • Analysis of various assays used to evaluate platelet response to aspirin.
  • Examination of epidemiological data and clinical studies.

Main Results:

  • Aspirin resistance lacks a clear, standardized definition, contributing to variable prevalence estimates.
  • Multiple mechanisms, including genetic and pharmacodynamic factors, can lead to aspirin resistance.
  • Certain patient characteristics (e.g., specific genetic polymorphisms, comorbidities) are associated with higher risks of aspirin resistance.
  • Aspirin resistance can significantly impact the effectiveness of aspirin in preventing ischemic events.

Conclusions:

  • Standardizing the definition and measurement of aspirin resistance is crucial.
  • Understanding the mechanisms and risk factors can guide personalized aspirin therapy.
  • Addressing aspirin resistance is essential for optimizing secondary prevention in cardiovascular disease.

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