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J Thorac Cardiovasc Surg 1999;117:141-147
© 1999 Mosby, Inc.


SURGERY FOR CONGENITAL HEART DISEASE

CRYOPRESERVED HOMOGRAFT VALVES IN THE PULMONARY POSITION: RISK ANALYSIS FOR INTERMEDIATE-TERM FAILURE

Kazuo Niwaya, MDa, Christopher J. Knott-Craig, MDa, Mary M. Lane, PhDa, K. Chandrasekaren, MDb, Edward D. Overholt, MDc, Ronald C. Elkins, MDa

From the Sections of Thoracic and Cardiovascular Surgery,a Cardiology,b and Pediatric Cardiology,c University of Oklahoma Health Sciences Center, Oklahoma City, Okla.

Read at the Seventy-eighth Annual Meeting of The American Association for Thoracic Surgery, Boston, Mass, May 3-6, 1998.

Received for publication May 8, 1998. Revisions requested June 5, 1998. Revisions received Sept 22, 1998. Accepted for publication Sept 28, 1998. Address for reprints: Christopher J. Knott-Craig, MD, Section of Thoracic and Cardiovascular Surgery, University of Oklahoma Health Sciences Center, Post Office Box 26901, Oklahoma City, OK 73190.

Objective: The purpose of this study was to examine the durability of cryopreserved homografts used to replace the "pulmonary" valve and to identify factors associated with their late deterioration.
Methods: We reviewed our entire experience (1985-1997) with 331 survivors in whom cryopreserved homograft valves (pulmonary, n = 304; aortic, n = 27) were used to reconstruct the pulmonary outflow tract. Median age was 14 years (range, 2 days–62 years). Operations included Ross operation (n = 259), tetralogy of Fallot (n = 41), truncus arteriosus (n = 14), Rastelli operation (n = 11), and others (n = 6). Median follow-up was 3.8 years (range, 0.2–11.2 years); late echographic follow-up was complete for 97% of patients. Homograft failure was defined as the need for explantation and valve-related death; homograft dysfunction was defined as a pulmonary insufficiency grade 3/4 or greater and a transvalvular gradient of 40 mm Hg or greater.
Results: Homograft failure occurred in 9% (30 of 331 patients; Kaplan-Meier); freedom from failure was 82% ± 4% at 8 years. Homograft dysfunction occurred in 12% (39 of 331 patients), although freedom from dysfunction was 76% ± 4% at 8 years. For aortic homografts, this was 56% ± 11%, compared to 80% ± 4% for pulmonary homografts (P = .003). For patients aged less than 3 years (n = 38), this was 51% ± 12%, compared with 87% ± 4% for older patients (P = .0001). By multivariable analysis, younger age of homograft donors, non-Ross operation, and later year of operation were associated with homograft failure; younger age of homograft donors, later year of operation, and use of an aortic homograft were associated with homograft dysfunction.
Conclusions: Homograft valves function satisfactorily in the pulmonary position at mid-term follow-up. The pulmonary homograft valve appears to be more durable than the aortic homograft valve in the pulmonary position.




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