ABSTRACT
Angina is the clinical manifestation of an imbalance between myocardial blood supply and oxygen demand. Although the clinical presentations vary, angina shares the same pathophysiology as the other acute coronary syndromes.1 Since unstable angina is frequently the forerunner to myocardial infarction, and given that some instances of infarction are occasionally classified under the heading of unstable angina, this clinical entity is the primary focus of this chapter.
