Multiple and single ventricular septal defect. A clinical and haemodynamic comparison.

The clinical, haemodynamic, and therapeutic data were compared in 52 patients with isolated single ventricular septal defect, and 40 patients with multiple ventricular septal defects as the sole cardiac anomaly. Cardiac catheterisation and angiocardiography were carried out between 1966 and 1975 in the multiple ventricular septal defects group, and in 1973 in the single ventricular septal defect group.