Most common cause is coronary arteriosclerosis.
Relative coronary insufficiency due to cardiac hypertrophy due to hypertension, valvular disease, or unknown causes. Healed rheumatic myocarditis. Healed multiple micro-infarcts due to emboli from vegetations of an infectious endocarditis. Healed infectious, immune, toxic, or idiopathic myocarditis. Repeated attacks of angina pectoris each represent a micro-infarct, with the evolution of confluent subendocardial scars.