The heart is a muscular organ that works non-stop throughout a person’s life to pump blood to organs and tissues throughout the body. In order to maintain this function of the heart. The heart itself must have an adequate blood supply. The nutrient vessels that supply the heart are located on the surface of the heart and they are the left and right coronary arteries. The left coronary artery is thicker and divides into two branches (anterior descending branch, gyrus branch) after the main trunk travels about 1 to 2 cm. The left coronary artery supplies blood mainly to the left side of the heart. The right coronary artery supplies blood mainly to the right side of the heart and the conduction system of the heart. When the blood supply vessels of the heart become narrowed and blocked, it causes myocardial ischemia and infarction, which decreases or loses the contraction force of the myocardium and reduces the contractile function of the heart, which is the common clinical condition of coronary atherosclerotic heart disease – coronary heart disease.