The mortality rate of pregnant women with heart disease is high, so here is a list of heart diseases that are not suitable for pregnancy in “Critical Care in Obstetrics and Gynecology” for your reference. Idiopathic pulmonary hypertension (IPH): Because the prognosis of IPH combined with pregnancy is very poor, the disease is difficult to diagnose and there is no special effective treatment. Early diagnosis should be made and pregnancy should be avoided or terminated early. Tetralogy of Fallot: The prognosis of patients with untreated tetralogy of Fallot is very poor, and the mortality rate in combined pregnancy is high, often due to severe hypoxemia, arrhythmias and congestive heart failure. Eisenmenger’s syndrome: This disease is a contraindication to pregnancy because of reduced blood volume in the pulmonary circulation, which leads to severe hypoxia in pregnant women and predisposes to thromboembolism and high maternal mortality, and death can occur at any stage of pregnancy. Marfan’s syndrome: When this disease is combined with pregnancy, the risk of progressive dilatation of the aortic root and rupture of the coarctation is high, especially in patients with aortic coarctation hematoma with an aortic root greater than 45 mm. However, there are also ruptures of clotted artery hematomas with smaller aortic root diameters. Congenital aortic stenosis: maternal mortality is directly related to the severity of the stenosis. Moderate stenosis is treated with surgical correction before pregnancy, and severe stenosis is a contraindication to pregnancy. Severe mitral stenosis in rheumatic heart disease: Patients are often associated with pulmonary hypertension, which is more dangerous for cardiopulmonary hemodynamics, prone to notational pulmonary edema, and also prone to arrhythmias, with a certain morbidity and mortality rate in pregnancy. Therefore, pregnancy after surgery is recommended in severe mitral stenosis. Percutaneous balloon valvuloplasty and conjoined partial separation or valve replacement are options. Malignant arrhythmias: e.g., ventricular tachycardia, complete heart block, etc. Patients with heart failure are also unsuitable for pregnancy.