Congenital defects, such as tricuspid atresia, affect the from birth. The two right chambers do not form the valve. Rather, a thick tissue layer stands in the way of blood flow between the right chambers. The illness restricts the ’s ability to pump blood. The underdeveloped right lower is a result of tricuspid atresia. Tricuspid atresia prevents the body from getting enough oxygen. As a result, they get tired easily and frequently get out of breath.