Clinical Study of Centrifugal Pump Bypass as an Auxiliary Technique for Surgical Treatment of Disease of the Thoracic Aorta

—Comparison of Left Heart Bypass and Arterial Bypass—

Abstract

Left heart bypass and arterial bypass using a centrifugal pump were performed as an auxiliary technique for treatment of disease of the thoracic aorta in 34 cases, and hemodynamic differences during aortic clamping were compared. Peripheral blood pressure, urinary output and bypass flow during aortic clamping showed no significant difference between left heart bypass and arterial bypass, But it seemed that arterial bypass was easier to support stable hemodyanmic status than left heart bypass. However, the indications of arterial bypass are ristricted by modality or region of the lesion in thoracic aorta. Left heart bypass is usually not affected by modality or region of lesion in thoracic aorta. But it is not easy to approach to the left atrium in cases of severe left ventricular hypertrophy, and we experienced two cases with complications of pericardial effusion related to the bypass technique. It is necessary to select, arterial bypass or left heart bypass, based on as understanding the merits of each bypass technique, and also for provide careful management to prevent complications related to the bypass technique.