. 2B ) is an axial-flow intraventricular pump with a length of 55 mm, a diameter of 25 mm, a weight of 85 g, 37 and a flow of 3 to 7 L/minute at speeds of 8,000 to 12,000 rpm. 42 From 1985 to 1991, preclinical studies at The Texas Heart Institute were conducted in 37 calves implanted with the Jarvik 2000, with chronic studies averaging 70 days. Hemolysis levels were elevated from baseline values only slightly with the administration of heparin and warfarin. Neurologic, renal, hepatic, and pulmonary functions were normal. 22
In the late 1990s, clinical