Coronary heart disease
Blood enters the heart through the two main coronary arteries, and through a network of blood vessels on the surface of the heart muscle so that the heart gets nutrients. Cholesterol and fat deposits are formed in the arteries and narrow the passages. This condition is called atherosclerosis. The blood flowing in the arteries forms a blood clot, blocking the arteries. When under physical or psychological stress, the heart beats faster and requires more oxygen and nutrients. This is a condition that the coronary arteries cannot cope with when they are severely narrowed or blocked. As a result, the insufficient blood supply to the coronary arteries leads to angina or heartache. The blood flow to the heart muscle is suddenly reduced due to the clogging of a coronary artery by a blood clot, and a heart attack occurs.
The degree of coronary atherosclerosis varies from severity to severity. Mild lesions have no obvious effect on the heart and do not produce symptoms. Heavier lesions can cause stenosis of the lumen. To a certain extent, although the blood it supplies can meet the daily needs of the myocardium, when the workload of the heart increases (such as strenuous labor or emotional excitement), the blood supply of the myocardium will be insufficient, resulting in angina, arrhythmia and heart failure.
The use of medication or surgery has been able to effectively treat coronary artery disease. Doctors will use various drugs to reduce the burden on the heart muscle and prevent arrhythmia. There are two types of surgical procedures for the treatment of coronary artery disease, one is called coronary angioplasty, which is a minor operation; the other is called coronary artery bypass graft, which is a major operation.