(Fig. 1). During experiments on dogs and sheep, it was established that 1) left ventricular output can be substituted and circulation can be maintained even during heart standstill;8 2) the aortic valve remains competent; coronary flow is not impaired; the bypass only seldomly causes arrythmias and the left ventricular endocardium is undamaged, or only slightly damaged;9 "0 3) experimental left ventricular failure with shock can be treated effectively in closed-chest dogs with recovery of heart function." Others independently demonstrated that in dogs the circulation can be maintained during ventricular fibrillation.6The purpose of this study is to determine the extent of left ventricular decompression that can be achieved with transarterial left heart bypass in sheep where left ven-
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