Tetralogy of fallot (ToF) is the most common form of cyanotic congenital heart disease after 1 year of age, with overall incidence approaching 10% of all congenital heart disease. Natural survival (i.e. without corrective procedure) into the fourth decade is extremely rare (only about 3%), but there is a tendency of increasing number of women with cyanotic congenital heart disease living 3 to 4…