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REVIEW

Narrative Review: Aspirin Resistance and Its Clinical Implications

Simon Sanderson, DPH; Jon Emery, PhD; Trevor Baglin, MD; and Ann-Louise Kinmonth, MD

1 March 2005 | Volume 142 Issue 5 | Pages 370-380

Aspirin is currently the most cost-effective drug for the secondary prevention of cardiovascular disease, but treatment failures are relatively common. Several factors have been linked to these recurrent vascular events in patients prescribed aspirin, including smoking, drug interactions, nonadherence, comorbid conditions, and aspirin resistance. The term aspirin resistance has been used to describe not only an absence of the expected pharmacologic effects of aspirin on platelets but also poor clinical outcomes, such as recurrent vascular events, in patients treated with aspirin. Aspirin resistance is perhaps more precisely understood as the phenomenon of measurable, persisting platelet activation that occurs in patients prescribed a therapeutic dose of aspirin and may underlie an unknown proportion of aspirin treatment failures. Key challenges for future research are to standardize a definition of aspirin resistance and to compare whether different measures of platelet activation, either alone or in combination, independently predict cardiovascular events. These challenges must be met before researchers conduct studies to assess the clinical utility of testing on patient outcomes and cost-effective prescribing.

Author and Article Information

From University of Cambridge, Addenbrooke's Hospital, and Institute of Public Health, Cambridge, United Kingdom; and University of Western Australia, Claremont, Western Australia, Australia.

Potential Financial Conflicts of Interest: None disclosed.

Requests for Single Reprints: Simon Sanderson, DPH, University of Cambridge, Strangeways Research Laboratory, Wort's Causeway, Cambridge CB1 8RN, United Kingdom; e-mail, simon.sanderson{at}srl.cam.ac.uk.

Current Author Addresses: Dr. Sanderson: University of Cambridge, Strangeways Research Laboratory, Wort's Causeway, Cambridge CB1 8RN, United Kingdom.

Dr. Emery: University of Western Australia, 328 Stirling Highway, Claremont, Western Australia 6010, Australia.

Dr. Baglin: Clinical Haematology, Addenbrooke's National Health Service Trust, Addenbrooke's Hospital, Hills Road, Cambridge CB2 2QQ, United Kingdom.

Dr. Kinmonth: Department of Public Health and Primary Care, Institute of Public Health, Robinson Way, Cambridge CB2 2QQ, United Kingdom.

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