Life expectancy of children with congenital heart disease (CHD) has increased dramatically during the past years, due to the successes of cardiac surgery. At present, nearly all of these children with CHD can be operated at young age and more than 90% reach adulthood. At adult age, however, many patients with CHD are at risk of complications. This thesis focused on the right sided complications often seen in patients with CHD, the implications on survival, the various treatment options available, as well as the impact of surgery on right ventricular function