CARDIAC OPERATIONS UNDER DIRECT VISION—Experience with Extracorporeal Oxygenation of the Blood

A heart-lung machine capable of oxygenating the blood and maintaining normal pressures during cardiopulmonary by-pass was used in 11 cases in which cardiac operations with the heart under direct vision were carried out. The first patient died. Improvements then were made in the machine and it was used in ten additional operations. One of the ten patients died, 18 hours postoperatively, of cardiac tamponade. Since then six more patients have been operated upon with no complications.