Veno-arterial bypass with a centrifugal pump without an oxygenator during cross clamping the descending thoracic aorta: experimental study and two clinical ex-periences.

Abstract

Ten dogs were examined for descending aorta clamping with veno-arterial bypass using a centrifugal pump without an oxygenator. A bypass route was made between the SVC and the femoral artery. A control study by left heart bypass between the left atrium and the femoral artery was done in 5 dogs. Aorta clamping time was set at 2 hours. All dogs survived 1 to 2 weeks and were sacrificed for laboratory data. In the venoarterial bypass group, PaO₂ and O₂ saturation of perfusion blood were low compared with the left heart bypass group, but there were no complications, and postoperative laboratory data were not significantly different from those of the control group.
We experienced 2 clinical cases of descending aortic surgical procedure with simplified veno-arterial bypass during aorta clamping. There were no complications due to this assist circulation, and postoperative courses were uneventful.