The normal blood pressure range value is 90-140mmHg systolic and 60-90mmHg diastolic. and blood pressure 60mmHg to 90mmHg after cardiac stent, generally understood as blood pressure 90/60mmHg, that is, high pressure 90mmHg, low pressure 60mmHg, at this time whether normal depends mainly on the cause of low blood pressure of the patient, and the presence of clinical symptoms. 1. normal : There are more reasons why the human body needs to implant cardiac stents, mainly for myocardial infarction. In the case of patients with acute myocardial infarction, myocardial necrosis will occur after the infarction, which will affect myocardial contractility and may lead to a decrease in ventricular pressure. For example, patients with inferior wall right ventricular myocardial infarction often experience a state of hypotension, when the blood pressure is 90/60 mmHg, a common manifestation after myocardial infarction. In addition, some vasodilator drugs may be applied after implantation of cardiac stent, such as isosorbide mononitrate, and such drugs may affect blood pressure, causing the blood pressure level to drop to 90/60 mmHg, which is the normal metabolic response of the body to the drugs; 2. Abnormal situation: If acute thrombosis in the stent occurs again in patients after cardiac stent, or emergency cardiac pressure blockage occurs, due to the decrease of myocardial contractility This situation is abnormal, and the low blood pressure at this time is often accompanied by symptoms such as chest pain, chest tightness, dyspnea and cyanosis, which may lead to the occurrence of adverse events if not treated actively.