Diuretics are contraindicated in right ventricular infarction for fear of aggravating hypotension and hypovolemia. Patients with right ventricular infarction often show hypovolemic shock, which is mainly due to the fact that after right ventricular infarction, the systolic and diastolic functions of the right ventricle are reduced, so the inflow of blood from the right ventricle to the pulmonary artery will be reduced, and the patient will be prone to hypotension, shock, dyspnea and other symptoms. Because under normal circumstances, all the blood flowing through the pulmonary artery comes from the right ventricle, when the systolic function of the right ventricle is reduced, it will lead to a decrease in the inflow of blood to the pulmonary artery, and the amount of blood returning to the left atrium and left ventricle will be significantly reduced, leading to the occurrence of hypotension, which in turn leads to insufficient perfusion of tissues and organs. The primary treatment at this time must be to replenish the blood volume so that the return blood volume increases, which will lead to an increase in blood flow from the right ventricle to the pulmonary artery and an increase in the left ventricular ejection volume. Since the pulmonary circulation is ischemic at this time, and the body circulation is also ischemic, diuretics should not be used at this time.