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Mark R. Bielefeld
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Ann Thorac Surg 2001;71:482-488
© 2001 The Society of Thoracic Surgeons

Original article: cardiovascular

Reoperative homograft right ventricular outflow tract reconstruction

Mark R. Bielefeld, MDa, Deborah A. Bishop, BSa, David N. Campbell, MDa, Max B. Mitchell, MDa, Frederick L. Grover, MDa, David R. Clarke, MDa

a Division of Cardiothoracic Surgery, University of Colorado Health Sciences Center, and The Children’s Hospital, Denver, Colorado, USA

Address reprint requests to Dr Clarke, The Children’s Hospital, Cardiothoracic Surgery, B200, 1056 19th Ave, Denver, CO 80218
e-mail: clarke.david{at}tchden.org

Presented at the The Forty-sixth Annual Meeting of the Southern Thoracic Surgical Association, San Juan, Puerto Rico, November 4–6, 1999.

Background. Homografts are implanted in the right ventricular outflow tract (RVOT) of children, with the knowledge that reoperation might be required. We reviewed 14 years of homograft RVOT reconstruction to assess the feasibility of homograft replacement and to determine risk factors for homograft survival.

Methods. From February 1985 through March 1999, 223 children (age 5 days to 16.9 years) underwent primary RVOT reconstruction with an aortic or pulmonary homograft. Of these, 35 patients underwent homograft explant at the implanting hospital with insertion of a second homograft from 2 months to 13.3 years after the first implantation. The primary operation and reoperation patient groups were compared with regard to incidence of early death, late death, homograft-related intervention without explant, and homograft explant.

Results. Actuarial survival and event-free curves for initial and replacement homografts were not significantly different. Univariable analysis was performed for the following risk factors: weight (p < 0.0001), age (p < 0.003), homograft diameter (p < 0.0001), homograft type (p < 0.01), surgery date (not significant [NS]), gender (NS), Blood Group match (NS), and type of distal anastomosis (NS). Multivariable analysis of significant univariable risks revealed small homograft diameter to be a significant risk factor (p < 0.001) for replacement.

Conclusions. The RVOT homografts eventually require replacement. Patient and homograft survival for replacement homografts is similar to primary homografts. Reoperative homograft RVOT reconstruction is possible, with reasonably low morbidity and mortality.




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