title: Initial clinical experience with the Jarvik 2000 implantable axial-flow left ventricular assist system.
abstract: BACKGROUND
  Implantable left ventricular assist systems (LVASs) are used for bridging to transplantation, bridging to myocardial improvement, and for permanent circulatory support. Conventional implantable systems have inherent limitations that increase morbidity during support. In contrast, small, efficient, axial-flow pumps, which have been under development for the past decade, have the potential to improve the length and quality of life in patients with severe heart failure. Methods and Results- To assess the safety and clinical utility of the Jarvik 2000, we implanted this device in 10 transplant candidates (mean age 51.3 years) in New York Heart Association (NYHA) class IV. Implantation was achieved through a left thoracotomy during partial cardiopulmonary bypass. The mean support period was 84 days. Within 48 hours postoperatively, the cardiac index increased 43%, pulmonary capillary wedge pressure decreased 52%, systemic vascular resistance decreased significantly, and inotropic support became unnecessary. Eight patients underwent physical rehabilitation and returned to NYHA class I. Their left ventricular dimensions, cardiothoracic ratios, and pressure-volume loop analyses showed good left ventricular unloading. Seven patients underwent transplantation and 3 died during support. No device thrombosis was observed at explantation.
  
  
  CONCLUSIONS
  The Jarvik 2000 functions as a true assist device by partially unloading the left ventricle, thereby optimizing the patient's hemodynamics. Our preliminary results indicate that this LVAS may safely provide circulatory assistance for heart transplant candidates.
authors.affiliation: Cullen Cardiovascular Surgical Research Laboratories, Texas Heart Institute, Houston, USA.
authors.forename: O H
authors.initials: OH
authors.lastname: Frazier
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Myers
authors.forename: Igor D
authors.initials: ID
authors.lastname: Gregoric
authors.forename: Tehreen
authors.initials: T
authors.lastname: Khan
authors.forename: Reynolds
authors.initials: R
authors.lastname: Delgado
authors.forename: Mihai
authors.initials: M
authors.lastname: Croitoru
authors.forename: Kathy
authors.initials: K
authors.lastname: Miller
authors.forename: Robert
authors.initials: R
authors.lastname: Jarvik
authors.forename: Stephen
authors.initials: S
authors.lastname: Westaby
mesh_terms: D000328:Adult; D005260:Female; D006333:Heart Failure / Q000601:surgery*; D006352:Heart Ventricles; D006353:Heart-Assist Devices / Q000009:adverse effects; D006439:Hemodynamics; D006470:Hemorrhage / Q000209:etiology; D006801:Humans; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D019919:Prosthesis Implantation