A myocardial bridge is a change in the location of the coronary artery. A normal coronary artery travels in the connective tissue under the epicardium, but if this coronary artery does not travel in the connective tissue under the epicardium, but in the myocardium, this segment of the myocardium is called a myocardial bridge. It is because there is a blood vessel underneath the myocardium and there is blood flowing in the vessel that this section of myocardium is called a myocardial bridge. The biggest danger of myocardial bridge is that when the normal heart contraction, the blood in the coronary artery is flowing, myocardial bridge of this section of blood vessels when the myocardium contraction, precisely this section of blood vessels caused the extrusion, that is, when the myocardium contraction, this section of blood vessels will become the formation of blood flow obstruction, diastole and back to normal, myocardial bridge patients will appear similar to the clinical symptoms of angina pectoris, myocardial bridge of prolonged blood flow, will cause damage to the vessel wall The prolonged blood backflow of myocardial bridge will cause damage to the blood vessel wall, thus forming plaque sclerosis.