2.2 Methods
After admission, patients with unstable angina were given aspirin + clopidogrel or ticagrelor, statins, low-molecular-weight heparins, and the use of ACEI and receptor blockers to prevent secondary coronary heart disease. Based on this treatment, Nicorandil was intravenously pumped, and the pumping speeds (2mg/h, 4mg/h and 6mg/h, respectively) were adjusted according to the patient’s blood pressure. We adjusted Nicorandil speed in half an hour, and continuously pumped total of 36mg before stopping the drug. During the treatment, observe the changes in blood pressure and heart rate of the patients before and after treatment, and observe whether the effect of Intravenous Nicorandil on the blood pressure of the patients is concentration-dependent, and monitor the adverse reactions during the medication.