Low blood pressure after cardiac stenting is considered to be caused by decreased cardiac function and pericardial effusion, or it may be caused by the use of drugs. 1. Decrease in cardiac function: low blood pressure after cardiac stenting is due to acute myocardial infarction in the course of treatment, and the contraction ability of myocardium will be reduced after myocardial necrosis, which will lead to the decrease of blood pressure. 2. Pericardial effusion: If the blood pressure is low after cardiac stenting, it may also be due to pericardial effusion. Stenting will cause myocardial injury, such as intracardiac perforation, pericardial effusion, etc. It will affect the diastolic function of the heart, and the heart’s filling will be lowered, and blood intake will be lowered, which will lower the blood pressure. 3. Use of medications: After cardiac stenting, patients often have to take oral medications to inhibit ventricular remodeling and heart rate, such as captopril, valsartan and metoprolol. The patient’s blood pressure should be closely monitored after cardiac stenting, and if it is significantly low, it is important to consult a doctor in time to clarify the cause of the disease and carry out targeted treatment.