<prompt> Highest mortality in pregnancy-Eisenmenger syndromeFallots tetrologvCoarctation of aortaMarfans syndrome  <response>: Eisenmenger syndrome These patients have pulmonary hypertension with shunt right to left through an open ductus or ASD or VSD. Maternal mortality is high i.e. 50 so is a perinatal loss 50.Fallots tetralogy, cocoarctationf aorta Marfans syndrome hav mortality rate of 5-10, 3-9 25 respectively. 