A disorder of cardiac function caused by insufficient blood flow to the muscle tissue of the heart. The decreased blood flow may be due to narrowing of the coronary arteries (coronary artery disease), to obstruction by a thrombus (coronary thrombosis), or less commonly, to diffuse narrowing of arterioles and other small vessels within the heart. Severe interruption of the blood supply to the myocardial tissue may result in necrosis of cardiac muscle (myocardial infarction). The disease is myocardial ischemia (MONDO_0024644). Also known as: IHD, ischaemic disease of myocardium, ischaemic heart disease, ischemic disease of myocardium, ischemic heart disease, myocardium ischaemic disease, myocardium ischemic disease.