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Low-dose aspirin increases aspirin resistance in patients with coronary artery disease

Pui-Yin Lee1, Wai-Hong Chen, William Ng

  • 1Department of Medicine, The University of Hong Kong, Queen Mary Hospital, China.

The American Journal of Medicine
|July 2, 2005
PubMed

Insights

Lower daily aspirin doses (≤100 mg) are linked to increased aspirin resistance in coronary artery disease patients. Higher doses may offer better platelet inhibition for preventing cardiovascular events.

Area of Science:

  • Cardiology
  • Pharmacology
  • Clinical Medicine

Background:

  • Aspirin is a cornerstone therapy for preventing atherothrombotic events.
  • Aspirin resistance, defined as inadequate platelet inhibition, is a growing concern.
  • Understanding factors influencing aspirin resistance is crucial for optimizing patient outcomes.

Purpose of the Study:

  • To investigate the association between aspirin dosage and aspirin resistance.
  • To identify predictors of aspirin resistance in stable coronary artery disease (CAD) patients.

Main Methods:

  • A study of 468 stable CAD patients taking daily aspirin (80-325 mg) for at least 4 weeks.
  • Aspirin responsiveness was measured using the VerifyNow Aspirin point-of-care assay.
  • Demographic and clinical data were collected to analyze predictors of resistance.

Main Results:

  • Aspirin resistance was observed in 27.4% of patients.
  • Lower aspirin doses (≤100 mg daily) were independently associated with higher aspirin resistance.
  • Hemoglobin levels and aspirin dose were identified as independent predictors of resistance.

Conclusions:

  • Daily aspirin doses of 100 mg or less are associated with a higher incidence of aspirin resistance in CAD patients.
  • Lower doses, while potentially having fewer side effects, may compromise therapeutic efficacy.
  • Further randomized trials are needed to determine optimal aspirin dosing for preventing ischemic complications.
Abstract

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