Aortopulmonary collateral flow as a risk factor for right heart bypass operation

pp 583-588

Abstract

Cardiac return during cardiac arrest was measured in 33 patients who underwent right heart bypass operation. The extent of cardiac return related to postrepair systemic venous pressure. In 4 out of 6 patients with percent cardiac return (percent cardiac return: ratio of cardiac return during cardiac arrest to total cardiopulmonary bypass flow) of more than 30% had pulmonary artery area index less than 0.55, but not vice versa. Six out of 11 patients, whose pulmonary artery area index was less than 0.55 and Sa0₂was more than 75%, had cardiac return more than 30%. Extent of cardiac return related to the age of patient except those whose major aortopulmonary collateral arteries were embolized preoperatively. It is concluded that aortopulmonary collateral flow is one of the risk factors for right heart bypass operation causing elevation of post-repair systemic venous pressure and the extent of aortopulmonary collateral flow is possible to be predicted bythe preoperative examinations