title: Hemodynamics and early performance of the St. Jude Medical Regent aortic valve prosthesis.
abstract: OBJECTIVE
  The St. Jude Medical (SJM) Regent heart valve is a new bileaflet prosthetic valve modified from the currently marketed SJM mechanical valve, with a modified external profile that results in a larger geometric orifice area without changing the existing design of the pivot mechanism or blood contact surface areas. The aim of the present study was to report the early hemodynamic and clinical results of an on-going multicenter trial investigating the clinical performance of the Regent mechanical aortic valve prosthesis.
  
  
  METHODS
  The early results from 204 patients at 11 centers in North America and Europe who underwent implantation of a Regent mechanical aortic valve prosthesis are described. Clinical status was prospectively recorded, and echocardiography with Doppler performed at hospital discharge, and at two and six months and one year postoperatively.
  
  
  RESULTS
  Follow up to date is 109.3 patient-years (average follow up 0.5+/-0.4 years per patient; range: 0 to 1.7 years). NYHA class improved for the group, and there were low rates of clinical adverse effects. Echocardiographic mean pressure gradient at six months was 13.8+/-10.3, 7.4+/-4.1, 5.4+/-3.2, 5.2+/-2.8, 3.4+/-2.3 and 3.6 mmHg, respectively, for 19, 21, 23, 25, 27 and 29 mm valves; effective orifice area was 1.5+/-0.6, 2.0+/-0.7, 2.4+/-1.0, 2.5+/-0.7, 3.6+/-1.4 and 4.8 cm2, respectively. There was a statistically significant decrease in left ventricular mass index between early postoperative (169.1+/-57.7 g/m2) and six months follow up (137.2+/-42.7 g/m2, delta = -30.1+/-42.5 g/m2, p <0.0001).
  
  
  CONCLUSIONS
  The SJM Regent aortic valve has excellent associated hemodynamics with rapid and significant left ventricular mass regression. In all cases of adverse events, rates fell within Objective Performance Criteria guidelines. Long-term clinical assessment is on-going.
authors.affiliation: The Department of Medicine, University of Michigan, Ann Arbor 48109, USA.
authors.forename: D S
authors.initials: DS
authors.lastname: Bach
authors.forename: M
authors.initials: M
authors.lastname: Goldbach
authors.forename: M P
authors.initials: MP
authors.lastname: Sakwa
authors.forename: M
authors.initials: M
authors.lastname: Petracek
authors.forename: L
authors.initials: L
authors.lastname: Errett
authors.forename: F
authors.initials: F
authors.lastname: Mohr
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001021:Aortic Valve / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D001022:Aortic Valve Insufficiency / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D015150:Echocardiography, Doppler; D004867:Equipment Design; D005060:Europe; D005260:Female; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D009656:North America; D011184:Postoperative Period; D011446:Prospective Studies