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Original Contribution
August 2005

Effect of Discontinuing Aspirin Therapy on the Risk of Brain Ischemic Stroke

Author Affiliations

Author Affiliations: Department of Neurology, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.

Arch Neurol. 2005;62(8):1217-1220. doi:10.1001/archneur.62.8.1217

Background  Aspirin, or acetylsalicylic acid, is widely used to prevent ischemic vascular disease. Clinical and experimental data suggest that a rebound effect occurs 4 or fewer weeks after interruption of aspirin therapy.

Objective  To study the discontinuation of aspirin therapy as a risk factor for ischemic stroke (IS).

Design  Case-control study.

Setting  Stroke unit.

Participants  Three hundred nine patients with IS or transient ischemic attack undergoing long-term aspirin treatment before their index event and 309 age-, sex-, and antiplatelet therapy–matched controls who had not had an IS in the previous 6 months.

Methods  We compared the frequency of aspirin therapy discontinuation during the 4 weeks before an ischemic cerebral event in patients and the 4 weeks before interview in controls.

Results  The 2 groups had a similar frequency of risk factors, except for coronary heart disease, which was more frequent in patients (36% vs 18%; P<.001). Aspirin use had been discontinued in 13 patients and 4 controls. Aspirin interruption yielded an odds ratio for IS/transient ischemic attack of 3.4 (95% confidence interval, 1.08-10.63; P<.005) after adjustment in a multivariable model.

Conclusions  These results highlight the importance of aspirin therapy compliance and give an estimate of the risk associated with the discontinuation of aspirin therapy in patients at risk for IS, particularly those with coronary heart disease.