Horizontal interventricular septum in congenital heart disease: surgical considerations.

A patient with complex congenital heart disease associated with a horizontal interventricular septum is described. In addition the ventricles were inverted, both great vessels arose from the left-sided right ventricle in the dextrotransposed position, and he had a ventricular septal defect of the type usually seen in endocardial cushion defect. Correction was performed using a Rastelli type procedure with good hemodynamic results.