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In 1989, Braunwald introduced a clinical classification system for unstable angina that rated patients according to severity, clinical circumstances, electrocardiographic changes, and medical treatment intensity. This study tested the ability of that system to predict short- and long-term outcomes in 417 patients admitted for suspected unstable angina to two hospitals in The Netherlands. According to the system's ratings of angina severity, patients with new-onset severe or accelerated angina without pain at rest are considered class I; those with angina at rest (but not having experienced it within the last 48 hours) fall into class II; and patients with angina at rest within the last 48 hours are class III. Rates of recurrence of chest pa…