Abstract
1. 1. Two cases of congenital tricuspid atresia with autopsies are presented. 2. 2. The cases illustrate two anatomical types of tricuspid atresia: (a) the more common tricuspid atresia without transposition of the great vessels and with pulmonary stenosis (Type IB), and (b) the rarer tricuspid atresia with transposition of the great vessels and without pulmonic or subpulmonic stenosis (Type IIB). 3. 3. In tricuspid atresia the electrocardiogram need not show left axis deviation. 4. 4. The presence or absence of pulmonary vascular markings is not a reliable differential point in the diagnosis of transposition of the great vessels without pulmonary stenosis. 5. 5. On the basis of the anatomical findings it is suggested that an aortopulmonary shunt (Potts) may be indicated in tricuspid atresia with transposition of the great vessels and without pulmonary stenosis. The anastomotic procedure might equalize the blood flow to the lungs and to the periphery.
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