When there is a problem with the heart, some patients have normal blood pressure and some do not. In the case of ordinary patients with coronary artery disease or angina pectoris and no previous history of hypertension, blood pressure is usually normal and the patient will not experience sudden fluctuations in blood pressure or suddenly develop hypertensive disease. If the blood pressure is suddenly abnormal and suddenly appears to drop substantially, the patient mostly has underlying heart disease and then suddenly will have acute cardiac insufficiency. Especially in patients with acute left heart failure, patients will experience cardiogenic shock in the middle and late stages, when the blood pressure will continue to drop to below 90 mmHg for a longer period of time. At this time, appropriate disposition should be given, treating the primary disease while giving symptomatic treatment to correct cardiogenic shock.