Embolism caused by arterial thrombosis often occurs in cardiovascular patients. The sources of arterial thrombosis are as follows. 1, cardiogenic many reports indicate that the most common cause of peripheral arterial embolism is cardiogenic, in 1977 Fogarty reported 338 cases of arterial embolism, embolism from heart disease accounted for 94% of which 77% accompanied by atrial fibrillation. In recent years, the nature of the cardiac source and the corresponding incidence has changed, rheumatic heart disease is not absolutely dominant as before, instead atherosclerosis and myocardial infarction play a more important role. Atherosclerotic coronary heart disease, including myocardial infarction, atrial fibrillation, congestive heart failure, and ventricular aneurysms account for approximately 60% of cases, while rheumatic heart disease accounts for 20%. Rheumatic heart disease and coronary heart disease, both of which have thrombosis within the left heart. In rheumatic heart disease, especially in mitral stenosis, stagnant blood flow in the atria combined with rheumatic lesions in the endothelium predispose fibers in the blood to attach to the atrial wall and form thrombi. Coronary heart disease, especially when myocardial infarction, left ventricle enlargement, contraction weakness, blood can not be emptied, more likely to occur arterial thrombosis. 2, vascular origin aneurysm, atherosclerotic atherosclerotic material in the formation of embolism, recently reported an increase. Large embolism can originate from a mixture of large atheromatous material, thrombus and cholinesterol crystals that are shed to the arterial circulation. Small embolisms are caused by the release of cholestrol crystals or by the shedding of ulcerated atherosclerotic plaques. 3.Medical origin In recent years, due to the widespread implementation of artificial heart valve conversion and artificial blood vessel transplantation, placement of pacemakers, arteriography, arteriovenous fistula of hemodialysis, intra-arterial indwelling catheter, and the application of large arterial counterpulsation balloon catheter, all may cause arterial embolism.