Acute hypertension refers to a sudden and marked increase in blood pressure, mostly greater than 180/120 mmHg, accompanied by progressive cardiac, cerebral, renal, and other important target organ insufficiency. The most common causes of death include acute left heart failure, acute coronary syndrome, aortic coarctation, massive cerebral infarction, massive intracranial hemorrhage, renal failure due to acute glomerulonephritis, hypertensive crisis in pregnancy, etc. Acute hypertension has a high lethality rate and a high risk of death, so it is necessary to reduce the blood pressure in a rapid and phased manner.