Main reason is arteriosclerosis and heart disease, as a result of arteriosclerosis, arterial tube wall is added thick, be in charge of antrum narrow, blood forms thrombus gradually.

• 主要的原因是动脉硬化和心脏病，由于动脉硬化，动脉管壁增厚，管腔变窄，血液逐渐形成血栓。