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What is Unstable Angina?

The following three patient groups may be said to have unstable angina pectoris.
  • Patients with new onset (< 2 months) angina that is severe and/or frequent (>) 3 episodes/day
  • Patients with accelerating angina, that is, those with chronic stable angina who develop angina that is distinctly more frequent, severe, prolonged or precipitated by less exertion than previously.
  • Those with angina at rest.
  • When unstable angina is accompanied by objective ECG evidence of transient myocardial ischaemia, this is associated with critical stenosis in one or more epicardial coronary arteries in about 85%.