How is unstable angina categorized in the Braunwald classification system?

Updated: Oct 01, 2020
  • Author: Walter Tan, MD, MS; Chief Editor: Eric H Yang, MD  more...
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Patients in Braunwald class I have new or accelerated exertional angina, whereas those in class II have subacute (>48 hours since last pain) or class III acute (< 48 hours since last pain) rest angina. The clinical circumstances associated with unstable angina are categorized as follows:

  • Secondary (anemia, fever, hypoxia)

  • Primary

  • Postinfarction (< 2 weeks after MI)

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