title: Transcatheter aortic valve implantation: durability of clinical and hemodynamic outcomes beyond 3 years in a large patient cohort.
abstract: BACKGROUND
  Although short- and medium-term outcomes after transcatheter aortic valve implantation are encouraging, long-term data on valve function and clinical outcomes are limited.
  
  
  RESULTS
  Consecutive high-risk patients who had been declined as surgical candidates because of comorbidities but who underwent successful transcatheter aortic valve implantation with a balloon-expandable valve between January 2005 and December 2006 and survived past 30 days were assessed. Clinical, echocardiographic, and computed tomographic follow-up examinations were performed. Seventy patients who underwent successful procedures and survived longer than 30 days were evaluated at a minimum follow-up of 3 years. At a median follow-up of 3.7 years (interquartile range 3.4 to 4.3 years), survival was 57%. Survival at 1, 2, and 3 years was 81%, 74%, and 61%, respectively. Freedom from reoperation was 98.5% (1 patient with endocarditis). During this early procedural experience, 11 patients died within 30 days, and 8 procedures were unsuccessful. When these patients were included, overall survival was 51%. Transaortic pressure gradients increased from 10.0 mm Hg (interquartile range 8.0 to 12.0 mm Hg) immediately after the procedure to 12.1 mm Hg (interquartile range 8.6 to 16.0 mm Hg) after 3 years (P=0.03). Bioprosthetic valve area decreased from a mean of 1.7±0.4 cm(2) after the procedure to 1.4±0.3 cm(2) after 3 years (P<0.01). Aortic incompetence after implantation was trivial or mild in 84% of cases and remained unchanged or improved over time. There were no cases of structural valvular deterioration, stent fracture, deformation, or valve migration.
  
  
  CONCLUSIONS
  Transcatheter aortic valve implantation demonstrates good medium- to long-term durability and preserved hemodynamic function, with no evidence of structural failure. The procedure appears to offer an adequate and lasting resolution of aortic stenosis in selected patients.
authors.affiliation: St Paul's Hospital, 1081 Burrard St, Vancouver, British Columbia, Canada V6Z 1Y6. john.webb@vch.ca
authors.forename: R
authors.initials: R
authors.lastname: Gurvitch
authors.forename: D A
authors.initials: DA
authors.lastname: Wood
authors.forename: E L
authors.initials: EL
authors.lastname: Tay
authors.forename: J
authors.initials: J
authors.lastname: Leipsic
authors.forename: J
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authors.lastname: Ye
authors.forename: S V
authors.initials: SV
authors.lastname: Lichtenstein
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authors.initials: CR
authors.lastname: Thompson
authors.forename: R G
authors.initials: RG
authors.lastname: Carere
authors.forename: N
authors.initials: N
authors.lastname: Wijesinghe
authors.forename: F
authors.initials: F
authors.lastname: Nietlispach
authors.forename: R H
authors.initials: RH
authors.lastname: Boone
authors.forename: S
authors.initials: S
authors.lastname: Lauck
authors.forename: A
authors.initials: A
authors.lastname: Cheung
authors.forename: J G
authors.initials: JG
authors.lastname: Webb
mesh_terms: D000369:Aged, 80 and over; D001024:Aortic Valve Stenosis / Q000401:mortality / Q000601:surgery*; D015331:Cohort Studies; D005500:Follow-Up Studies; D019918:Heart Valve Prosthesis Implantation / Q000009:adverse effects; D006439:Hemodynamics; D006801:Humans; D015996:Survival Rate; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome