Background Rates of dual antiplatelet therapy (DAPT) after high‐risk transient ischemic attack or minor ischemic stroke (TIAMIS) are suboptimal. We performed a cost‐effectiveness analysis to characterize the parameters of a quality improvement (QI) intervention designed to increase DAPT use after TIAMIS. Methods and Results We constructed a decision tree model that compared current national rates of DAPT use after TIAMIS with rates after implementing a theoretical QI intervention designed to increase appropriate DAPT use. The base case assumed that a QI intervention increased the rate of DAPT use to 65% from 45%. Costs (payer and societal) and outcomes (stroke, myocardial infarction, major bleed, or death) were modeled using a lifetime horizon. An incremental cost‐effectiveness ratio
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