The following results were obtained :

1) Out of the 78 cases, 45 were male and 64 were female.

2) The electrocardiogram showed right axis deviation in 71 cases(91%) and right ventricular hypertrophy in 66 cases(84.6%).

3) Chest X-ray revealed that, the cardiothoracic ratio was normal or decreased in 68 cases(87.3%), and cardiac apex elevation was noticed in 57 cases(73%).

4) Pulmonary stenosis were chiefly valvular and infundibular type(53.8%).

5) The associated heart diseases with TOF were patent foramen ovale(64.1%), right sided aortic arch(19.2%), and secundum ASD(10.3%), in that order.

6) There was an intimate correlation between secondary polycythemia and thrombocytopenia.

7) Among the 78 Cases, 73 cases had total correction, 1 case had shunt operation, and 4cases had total correction after shunt operation. The highest mortality rate occurred in the cases of total correction after shunt operation(25%). The cases with a main pulmonary artery size of 1/3 to 2/3 against, the aorta had a higher mortality than the other group, and no cases expired in the group with a ratio of more than 2/3. The overall surgical mortality was 8.9%.