[Pulmonary atresia with intact interventricular septum. Study of 28 cases].

The present report is based on the study of 28 cases of pulmonary atresia with intact ventricular septum, all of them necropsically and/or angiographically verified. A microscopic study of the wall of both ventricles was performed in the 20 necropsy cases. The size of the right ventricular cavity, a fact of great surgical significance, did not correlate with the electrocardiogram and varied from diminute to very large. In two cases necropsically proved there was as associated atresia of the infundibular, in one of them existing additionally an Ebstein malformation of the tricuspid valve, which could be angiocardiographically diagnosed. The surgical mortality, in our hands, is 64.3%. All survivors have a small right ventricle.