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To the Editor: In their retrospective analysis of 1568 patients with acute coronary syndrome who were treated with medication alone, Dr Ho and colleagues¹ showed an approximately 2-fold increase in the rate of adverse events during the interval of 0 to 90 days after clopidogrel cessation compared with the interval of 91 to 180 days. Although the authors stated that such an increased risk for 0 to 90 days was consistent across the different durations of clopidogrel therapy in Table 3,¹ there seemed to be an attenuation of the risk with a longer duration of clopidogrel therapy. In addition, despite the relatively large number of patients who took clopidogrel more than 270 days (n = 817), the adjusted incidence rate ratio comparing the intervals of 0 to 90 days vs 91 to 180 days did not reach statistical significance, suggesting a very small number of adverse events in this group of patients.

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Dae Hyun Kim, MD, MPH
dae-hyun.kim@mail.tju.edu
Department of Medicine
Jefferson Medical College
Philadelphia, Pennsylvania

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