title: Left ventricular mass regression early after aortic valve replacement.
abstract: BACKGROUND
  Regression of left ventricular hypertrophy is an important and well-recognized salutary effect of aortic valve replacement. The earliest evidence of left ventricular mass regression after aortic valve replacement and the influence of prosthesis type are not well known, and were the focus of this study.
  
  
  METHODS
  Transthoracic echocardiography was used to measure left ventricular mass index preoperatively and before discharge in 57 consecutive patients undergoing isolated aortic valve replacement (with or without coronary artery bypass grafting).
  
  
  RESULTS
  Three patients were excluded from the study because of inability to obtain accurate M-mode echocardiographic images for left ventricular mass measurement preoperatively (1) or postoperatively (2). Of the remaining 54 patients, mechanical bileaflet valves were used in 19, stented tissue bioprostheses were implanted in 15, and a stentless porcine bioprosthesis was chosen for 20. Postoperative echocardiograms were obtained 4.9 +/- 2.3 days after aortic valve replacement (range, 2 to 9 days). A two-way repeated-measures analysis of variance demonstrated a significant reduction of left ventricular mass index before discharge (preoperative 141.4 +/- 45.2 g/m2, postoperative 127.5 +/- 32.8 g/m2; p = 0.0005) but no differences between prostheses.
  
  
  CONCLUSIONS
  Left ventricular mass regression begins early after aortic valve replacement, probably because of reduction of transvalvular gradients and left ventricular wall stress. At least in the very early postoperative period, the type of prosthesis does not influence the extent of mass regression.
authors.affiliation: Division of Cardiovascular Surgery, Sunnybrook Health Science Centre, University of Toronto, Ontario, Canada.
authors.forename: G T
authors.initials: GT
authors.lastname: Christakis
authors.forename: C D
authors.initials: CD
authors.lastname: Joyner
authors.forename: C D
authors.initials: CD
authors.lastname: Morgan
authors.forename: S E
authors.initials: SE
authors.lastname: Fremes
authors.forename: K J
authors.initials: KJ
authors.lastname: Buth
authors.forename: J Y
authors.initials: JY
authors.lastname: Sever
authors.forename: V
authors.initials: V
authors.lastname: Rao
authors.forename: K P
authors.initials: KP
authors.lastname: Panagiotopoulos
authors.forename: P M
authors.initials: PM
authors.lastname: Murphy
authors.forename: B S
authors.initials: BS
authors.lastname: Goldman
mesh_terms: D000368:Aged; D001021:Aortic Valve / Q000601:surgery*; D001705:Bioprosthesis; D004452:Echocardiography; D005260:Female; D006349:Heart Valve Diseases / Q000150:complications; D006350:Heart Valve Prosthesis; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000000981:diagnostic imaging* / Q000209:etiology; D008297:Male; D008875:Middle Aged