For Angina -- Unstable we have a term and definition in Cardiovascular.

Angina -- Unstable (Cardiovascular)

This is the most serious form of angina and can indicate an imminent myocardial infarction. Its onset is unpredictable and frequent. Vasospasm may contribute to the condition. Also small embolisms getting caught in the already atherosclerotic coronary vessels might be the underlying cause.
Therapy. Drug treatment is similar to exercise induced angina. Beta-blockers, calcium channel blockers and organonitrates can all be effective. If there is a vasospastic component, beta-blockers should not be used. Heparin, aspirin, and surgical procedures (cardiac bypass or angioplasty) might be indicated.

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