Low blood pressure is normal after having a cardiac stent. If a significant decrease is not normal, there may be a decrease in cardiac function, pericardial effusion, or it may be related to the use of medication. 1. A mild decrease in blood pressure level after cardiac stenting is normal. After the blood supply to the heart is improved, the blood pressure level will decrease to a certain extent, which may be related to the improvement of cardiac perfusion. 2. A significant decrease in blood pressure level after cardiac stenting is abnormal. It means that acute myocardial infarction may have occurred during the treatment, and myocardial contractility will decrease after myocardial necrosis, resulting in a low blood pressure level. 3. If low blood pressure occurs after stenting, the possibility of pericardial effusion should also be considered. Implantation of stents may lead to myocardial damage, such as intracardiac perforation, and pericardial effusion may occur, which affects the diastolic function of the heart, reduces the filling volume of the heart, and reduces the amount of blood uptake, resulting in low blood pressure. 4. After cardiac stenting, patients often need to take anti-ventricular remodeling and heart rate control drugs, such as captopril, valsartan, metoprolol, etc. Such drugs have the effect of lowering blood pressure, and at this time, low blood pressure can be reduced to reduce the dosage of drugs. Low blood pressure after stenting should pay attention to strengthen the monitoring, the symptoms are obvious, we should go to the hospital in a timely manner, to clarify the specific causes, to give targeted treatment.