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Background  Acute coronary syndrome (ACS) patients have a wide spectrum of risks for subsequent cardiovascular events and death. However, there is no simple, convenience scoring system to identify risk of adverse outcomes. We investigated whether CHADS 2  and CHA 2 DS 2 -VASc scores were useful tools to assess the risk for adverse events among ACS patients.    Methods  This observational prospective study was conducted at 39 hospitals. Totally 3,183 patients with ACS were enrolled, and CHADS 2  and CHA 2 DS 2 -VASc scores were calculated. The primary endpoint was occurrence of adverse event, including subsequent myocardial infarction, stroke, or death, within 1 year of discharge.    Results  CHADS 2  and CHA 2 DS 2 -VASc scores were significant predictors of adverse events in separate multivariate regression analyses. A Kaplan-Meier analysis of CHADS 2  and CHA 2 DS 2 -VASc scores of ≥2 showed a higher rate of adverse events as compared with scores of <2 ( P <0.001;log-rank test). CHA 2 DS 2 -VASc score was better than CHADS 2  score in predicting subsequent adverse events; the area under the receiver operating characteristic curve increased from 0.66 to 0.70 ( p <0.001). Patients with CHADS 2  scores of 0 or 1 were further classified according to CHA 2 DS 2 -VASc score, using a cutoff value of 2. The rate of adverse events significantly differed between those with a score of <2 and those with a score of ≥2 (4.1% vs.10.7%,  P <0.001).    Conclusions  CHADS 2  and CHA 2 DS 2 -VASc scores were useful predictors of subsequent adverse events in ACS patients.

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Use of CHADS2 and CHA2DS2-VASc Scores to Predict Subsequent Myocardial Infarction, Stroke, and Death in Patients with Acute Coronary Syndrome: Data from Taiwan Acute Coronary Syndrome Full Spectrum Registry