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Braunwald Classification of Unstable Angina (UA)



Severity
Clinical Circumstances
A
B
C
Develops in presence of extracardiac condition that intensifies myocardial ischemia (secondary UA)
Develops in the absence of extracardiac condition (primary UA)
Develops within 2 weeks after acute myocardial infarction (postinfarction UA)
I
New onset of severe angina or accelerated angina; no rest pain
IA
IB
IC
II
Angina at rest within past month but not within preceding 48 hr (angina at rest, subacute)
IIA
IIB
IIC
III
Angina at rest within 48 hr (angina at rest, acute)
IIIA
IIIB Troponin negative
IIIB Troponin positive
IIIC

hr, hours; IAM, myocardial infarction; UA, unstable angina.


References:
  1. Hamm CW, Braunwald E. A classification of unstable angina revisited. Circulation. 2000 Jul 4;102(1):118-22. [Medline]
  2. Braunwald E. Unstable angina. A classification. Circulation. 1989 Aug;80(2):410-4. [Medline]

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