Background
Unstable angina (UA) is myocardial ischemia occurring at rest or minimal exertion without acute cardiomyocyte injury or necrosis. Key features include:
- Prolonged (>20 minutes) angina at rest.
- New onset of severe angina.
- Increasing frequency, duration, or intensity of angina.
- Angina after a recent myocardial infarction.
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