The effects of right heart bypass on acute ventricular failure with and without ventricular fibrillation.

A tgchnique was developed for closedchest bypass of the right ventricle. Blood is removed from the right alrium and returned into the pulmonary artery. The blood return cannula can be inserted without x-ray equipment. The maximum flow through the system is ten liters per minute. Acute right ventricular failure produced by embolization of pulmonary arteries with starch could be treated promptly and repeatedly with the bypass. In six out of eight failure periods, the right ventricle had recovered after only five minutes of bypass Progressive d s crease of the arterial oxygen saturation, inherent with diffuse pulmonary embolization, could not be reversed. During ventricular fibrillation, while the circulation was maintained with closed-chest left ventricular bypass (transarterial), right heart bypass could not substitute right heart-function. The reasons for this failure were incompetence of the pulmonary artery and bicuspid valves and increase of pulmonary arterial resistance.