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Aspirin resistance in secondary stroke prevention

J Berrouschot¹, B Schwetlick, G von Twickel

¹Department of Neurology, Municipal Hospital Altenburg, Altenburg, Germany. berrouschot.kkh-altenburg@t-online.de

Acta Neurologica Scandinavica

|December 22, 2005

Abstract

Background:

We investigated the platelet function in stroke patients treated with aspirin [acetylsalicylic acid (ASA)] for secondary stroke prevention during a follow-up period of 1 year.

Methods:

In this prospective study 291 patients with first initiated aspirin therapy (300 mg/day) for secondary stroke prevention were included. Platelet aggregation measurements were performed 24 h, 3, 6, and 12 months after starting medication.

Results:

Twenty-one of 291 patients (7.2%) were identified as primary ASA-non-responders (initial insufficient platelet inhibition) and 4.1% as secondary ASA-non-responders (insufficient platelet inhibition during follow-up). There were no significant differences between ASA-responders and ASA-non-responders concerning age, gender, risk factors, and stroke characteristics.

Conclusion:

Aspirin resistance in stroke patients is not uncommon. The clinical usefulness of routine platelet function tests needs to be proved by further trials.

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