Table 3. Risk stratification of women with congenital heart defect according to diagnosis (9).

Experience shows low risk Estimated risk of cardiac complications or death: >1‰ and < 1%	Experience shows medium risk Estimated risk of cardiac complications or death: 1% to 5%	Experience shows high risk Estimated risk of cardiac complications or death: >5%
Left-right shunt without pulmonary hypertension Corrected tetralogy of Fallot without residual lesion such as severe pulmonary insufficiency or right ventricular dysfunction Surgically treated aortic isthmus stenosis without aneurysm or restenosis Bicuspid aortic valve with normal function and without dilatation of the ascending aorta Status post biological valve replacement with good valvular function and normal cardiac function Asymptomatic mitral or aortic insufficiency without left ventricular dysfunction Mild to moderate pulmonary stenosis	Non-severe aortic or mitral stenosis Cyanotic heart defect without pulmonary hypertension Single ventricle with good ventricular function (with or without Fontan circulation) Mechanical heart valve Severe pulmonary stenosis Marfan syndrome without severe dilatation of the aortic root Right systemic ventricle with non-severe dysfunction (e.g. D-TGA after atrial switch or congenitally corrected TGA) Non-operated aortic isthmus stenosis	Severe aortic or mitral stenosis Pulmonary hypertension (Eisenmenger syndrome or pulmonary hypertension without congenital heart defect) Single ventricle with poor ventricular function (with or without Fontan circulation) Marfan syndrome with severe dilatation of the aortic root (>4 cm) Right systemic ventricle with severe dysfunction (e.g. D-TGA after atrial switch or congenitally corrected TGA)

D-TGA, simple transposition of the great arteries