title: In vivo studies of the MagScrew total artificial heart in calves.
abstract: The purpose of this study was to evaluate the in vivo pump performance of our total artificial heart (TAH), the "MagScrew TAH." The TAH consists of a blood pump and control logic developed at the Cleveland Clinic and the MagScrew actuator and electronic control system developed by Foster-Miller Technologies, Inc. (Albany, NY). MagScrew TAH implantation was performed in two calves. Study durations were 50 and 5 days. The causes of termination were prosthetic valve endocarditis in one case and cable failure in the other. Mean left pump flow ranged from 8.0 to 9.7 L/min, with left atrial pressure of 3.0 to 16.0 mm Hg. Preload sensitivity of the MagScrew TAH demonstrated a Frank-Starling response to preload in automatic mode. The relationship between right and left atrial pressure was well balanced. Mean arterial pressure and mean pulmonary artery pressure were maintained within physiologic ranges over study duration. There were no signs of bleeding, hemolysis, or organ failure. The MagScrew TAH showed physiologic pump performance, and hemodynamics were well maintained without any organ failure. Further development testing will bring the MagScrew TAH to the point of preclinical readiness testing.
authors.affiliation: Department of Biomedical Engineering, Lerner Research Institute, The Cleveland Clinic Foundation, OH 44195, USA.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Doi
authors.forename: William A
authors.initials: WA
authors.lastname: Smith
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Harasaki
authors.forename: Masami
authors.initials: M
authors.lastname: Takagaki
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Ochiai
authors.forename: Michael W
authors.initials: MW
authors.lastname: Howard
authors.forename: Stephan
authors.initials: S
authors.lastname: Weber
authors.forename: Bryan P
authors.initials: BP
authors.lastname: Byerman
authors.forename: Alex L
authors.initials: AL
authors.lastname: Massiello
authors.forename: Nicolas
authors.initials: N
authors.lastname: Vitale
authors.forename: Art
authors.initials: A
authors.lastname: Donahue
authors.forename: Gordon
authors.initials: G
authors.lastname: Hirschman
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Fukamachi
mesh_terms: D000818:Animals; D002417:Cattle; D006354:Heart, Artificial; D006439:Hemodynamics; D011182:Postoperative Care