Angina pectoris

Angina pectoris is a clinical syndrome caused by insufficient coronary blood supply, with acute, transient myocardial ischemia and hypoxia. Its characteristics are paroxysmal squeezing pain in the anterior chest, which may be accompanied by other symptoms. The pain is mainly located behind the sternum and may radiate to the precordial area and left upper limb. It often occurs during exertion or emotional excitement, lasts for several minutes, and disappears after rest or administration of nitrates. This disease is more common in males, with most patients over 40 years of age. Fatigue, emotional excitement, overeating, cold exposure, rainy weather, and acute circulatory failure are common precipitating factors.