If nitroglycerin is administered by intravenous pumping, 50 ml of saline or glucose can be used to put 20-50 mg of nitroglycerin, starting from 5-10 μg/min and pumping about 7.5 ml-15 ml per hour. depending on the actual response of the patient, the rate of administration can be adjusted, and the dose can be increased by 25%-50% every 5-10 minutes until a more satisfactory efficacy is achieved. The efficacy of the treatment, but the maximum dose should not exceed 1500 μg/min and can be continuously pumped for 36 hours. In case of continuous application, care should be taken to increase the dose of the drug to avoid the development of drug resistance, and only by gradually increasing the dose can the efficacy continue to be maintained.