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Replacement of the aortic valve or root with a pulmonary autograft in children
Insights
The pulmonary autograft procedure, using a patient's own pulmonary valve for aortic valve replacement, shows promising medium-term results in young patients. This technique may be an ideal biological valve option for children needing left ventricular outflow tract reconstruction.
Area of Science:
- Cardiovascular Surgery
- Pediatric Cardiology
- Thoracic Surgery
Background:
- Aortic valve or root replacement in pediatric patients presents unique challenges.
- The use of autografts, particularly the pulmonary valve, is an alternative to prosthetic materials.
- Long-term outcomes of pulmonary autografts in young individuals require thorough evaluation.
Purpose of the Study:
- To assess the early and medium-term efficacy and safety of pulmonary autograft use in pediatric patients.
- To evaluate the rates of reoperation, mortality, and structural integrity of the pulmonary autograft.
- To determine the functional status of patients following this reconstructive procedure.
Main Methods:
- Retrospective analysis of 34 patients (ages 3-18) undergoing aortic valve/root replacement with pulmonary autografts.
- Data collection included indications for surgery, early and late mortality, reoperations, and functional outcomes.
- Actuarial analysis was used to determine freedom from reoperation and late survival rates.
Main Results:
- Hospital mortality was 11.8%, with no early deaths after 1971.
- Late mortality was 13.3%, and 4 patients required autograft removal due to endocarditis.
- At 16 years, actuarial rates were 74% for freedom from reoperation (left ventricular outflow tract) and 77% for survival.
- No primary structural degeneration of the pulmonary autograft was observed; all survivors were in New York Heart Association Class I.
Conclusions:
- The pulmonary autograft procedure demonstrates favorable early and medium-term outcomes in young patients.
- The absence of structural degeneration suggests durability and potential for growth.
- This technique represents a viable biological valve option for pediatric left ventricular outflow tract reconstruction.
Abstract:
Between January 1967 and December 1988, 34 patients ranging in age from 3 to 18 years (mean, 14 +/- 3.6 years) underwent replacement of the aortic valve or root with their own pulmonary valve. The indication for operation was left ventricular outflow obstruction in 16 patients (47%), aortic regurgitation in 14 (41%), mixed aortic valve disease in 3 (9%), and failure of a previously implanted aortic homograft in 1 (3%). There were four early deaths, all before 1971, giving a hospital mortality of 11.8% (70% confidence interval, 6% to 20%). Surviving patients have been followed up a cumulative total of 214 patient-years, the longest period of observation being 16 years 8 months. Late mortality was 13.3% (70% confidence interval, 7% to 23%), and 4 other patients required removal of the pulmonary autograft for endocarditis. Actuarial rates at 16 years were 74% +/- 11% for freedom from reoperation on the left ventricular outflow tract, 80% +/- 10% for freedom from reoperation on the right ventricular outflow tract, and 77% +/- 10% for late survival. There was no instance of primary structural degeneration in the pulmonary autograft, and all surviving patients were in New York Heart Association functional class I without medication. This experience demonstrates that the pulmonary autograft can achieve good early and medium-term results in young patients. Should growth potential be realized, it might constitute the ideal biological valve for the left ventricular outflow in children.