Mitral valve disease: if the mitral valve is not reparable/failed repair, is bioprosthesis suitable for replacement?
OBJECTIVE
The durability of mitral bioprostheses has long been known to be inferior to aortic bioprostheses. Mitral valve reconstruction/repair is currently recommended for most mitral valve procedures. The choice of prostheses for non-reparable or failed mitral valve repairs has not been specified or given appropriate attention within the literature. The objective of this study is to address the role of bioprostheses in the specific subset of non-reparable or failed repair patients by using the knowledge of the general durability of mitral porcine bioprostheses, inclusive of the Carpentier-Edwards mitral porcine bioprosthesis.


METHODS
The CE-SAV was implanted in 1135 patients (1175 operations) for mitral valve replacement (MVR) from 1982 to 2000. The mean age was 65.0+/-12.1 years (range 13-86 years). The mean follow-up was 6.4+/-4.5 years, 7555.9 patient-years and 98.3% complete. The evaluation considered freedom from structural valve deterioration (SVD) and freedom from composites of complications, as well as risk assessment.


RESULTS
For the 51-60 year age group, the actual and actuarial freedom from SVD was, at 18 years, 56.0+/-4.1% and 14.7+/-5.8%; for the 61-70 year age group was, at 18 years, 69.6+/-2.6% and 26.5+/-5.9%, respectively. For the >70 group, at 15 years was 92.2+/-2.0% and 69.0+/-9.7%, respectively. There were a total of 256 SVD events with 31 fatalities and 226 reoperations with 10 fatalities (4.42%). The predictors of SVD were age (hazard ratio [HR] 0.98, p=0.0002), concomitant CAB (HR 0.66, p=0.020) and valve size (HR 1.08, p=0.034). The overall actual freedom, at 15-18 years, for >70 age group was, for valve-related reoperation, 94.3+/-1.5%; and for valve-related mortality was 87.8+/-2.3%.


CONCLUSIONS
The CE-SAV mitral porcine bioprosthesis cannot be recommended as representative of prosthesis-type of choice for non-reparable or failed repair of native mitral valves for ages </=70 years. The CE-SAV mitral porcine bioprosthesis is satisfactory for implantation >70 years of age. The clinical performance of the CE-SAV is similar to other mitral bioprostheses.
Jamieson
William Robert Eric
WR
University of British Columbia, Vancouver, Canada.
Gudas
Virginia M
VM
Burr
Lawrence H
LH
Janusz
Michael T
MT
Fradet
Guy J
GJ
Ling
Hilton
H
Germann
Eva
E
Lichtenstein
Samuel V
SV
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D001705:Bioprosthesis; D004812:Epidemiologic Methods; D005260:Female; D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery*; D011475:Prosthesis Failure; D012086:Reoperation / Q000379:methods; D013552:Swine; D017211:Treatment Failure; D055815:Young Adult