John S. Rumsfeld, MD, PhD1

Rates of death and myocardial infarction were assessed for a national sample of acute coronary syndrome patients after stopping clopidogrel. In the first 90 days after stopping treatment, patients experienced a nearly twofold increased risk of adverse events compared with subsequent follow-up intervals for patients treated medically without stents and for patients treated with coronary stents. This suggests a possible clopidogrel rebound effect, but additional studies are needed to support this hypothesis and to identify strategies to reduce early events after clopidogrel cessation.