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Aortic valve replacement with pulmonary homografts. Early experience
G Gerosa1, D N Ross, P E Brucke
1Department of Cardiovascular Surgery, University of Padova School of Medicine, Italy.
The Journal of Thoracic and Cardiovascular Surgery
|February 1, 1994
Summary
Pulmonary homografts demonstrate comparable biomechanical properties to aortic homografts, making them a viable alternative for aortic valve replacement. Early clinical results show promising survival rates and low reoperation rates, suggesting their efficacy in this application.
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
- Valvular Heart Disease
Background:
- Increasing demand for aortic valve substitutes and limited donor availability necessitate alternative options.
- Pulmonary homografts are being considered as a substitute for aortic valve replacement.
- This study compares pulmonary and aortic homograft properties and evaluates early clinical outcomes.
Purpose of the Study:
- To compare the ultrastructural and biomechanical properties of pulmonary and aortic homograft leaflets.
- To assess the early clinical results of using pulmonary homografts for aortic valve replacement.
Main Methods:
- Light and transmission electron microscopy for ultrastructural analysis.
- Uniaxial tensile tests on 69 human pulmonary and aortic valve cusps.
- Clinical evaluation of 123 patients receiving pulmonary homografts for aortic valve replacement.
Main Results:
- Pulmonary leaflets are thinner with less elastic tissue but show no substantial ultrastructural differences.
- Biomechanical tests revealed similar tensile strength and extensibility between pulmonary and aortic leaflets.
- Early clinical outcomes showed a 2.43% hospital mortality, 97.5% 3-year survival, and 95.5% freedom from reoperation at 3 years.
Conclusions:
- Pulmonary homografts exhibit comparable biomechanical properties to aortic homografts.
- The use of pulmonary homografts for aortic valve replacement demonstrates favorable early clinical outcomes.
- Pulmonary homografts represent a promising alternative for aortic valve replacement, addressing donor valve limitations.