Cardiovascular blockage is more common in clinical practice, mainly for the following reasons: 1, coronary atherosclerosis, often with hypertension, hyperlipidemia, hyperuricemia, hyperglycemia and other basic diseases, usually have smoking, drinking and other bad habits, which eventually lead to coronary atherosclerosis; if the plaque of patients with coronary atherosclerosis rupture and bleeding under the action of causative factors, the formation of thrombus later will cause cardiovascular 2, rheumatic heart disease and other diseases, accompanied by atrial fibrillation, very easy to form a thrombus in the heart, after shedding will enter the blood circulation, into the coronary arteries, will cause acute cardiovascular blockage, the formation of myocardial infarction; 3, coronary artery spasm, some patients may not have coronary artery atherosclerosis, due to abnormal endothelial function of the blood vessels caused by continuous cardiovascular spasm, serious cases can cause cardiovascular blockage and myocardial infarction.