| http://www.w3.org/ns/prov#value | - Unstable angina was classified based on the presence of (1) new-onset symptoms (within 48 hours), (2) symptoms at rest, or (3) worsening symptoms, such as increased frequency or duration.28 Data on characteristics of the AMI, including cardiac enzyme levels and in-hospital treatment, were collected from hospital discharge summaries available in the electronic medical record.
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