The causes of low blood pressure after cardiac stent surgery are as follows: 1. The acute phase, i.e. low blood pressure within 1-2 days of stent surgery, needs to be paid great attention to whether the patient has complications, such as low blood pressure caused by pericardial tamponade, vascular perforation, etc., or acute occlusion of blood vessels causing myocardial infarction, resulting in low blood pressure. Need to actively look for the cause of low blood pressure and timely treatment, such low blood pressure may be a danger signal of fatal disease; 2, some patients by stent surgery weeks or months after the performance of low blood pressure, usually no greater relationship with stent surgery, can be considered drugs or other aspects of the recent diet and other reasons, resulting in low blood volume, causing hypotension.