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[External conduit repair for congenital heart diseases]
Insights
External conduit repair effectively treats complex heart anomalies in pediatric and adult patients. Post-operative right ventricular systolic pressure significantly impacts long-term survival rates, highlighting the need for careful management.
Area of Science:
- Cardiovascular Surgery
- Pediatric Cardiology
- Biomaterials Science
Context:
- Complex congenital heart anomalies necessitate surgical intervention, often involving conduit repair.
- A significant number of pediatric patients (41/85) were between 5 and 9 years old.
- The study encompasses diverse anomalies including d-transposition, Tetralogy of Fallot with pulmonary atresia, truncus arteriosus, and l-transposition.
Purpose:
- To evaluate the efficacy and long-term outcomes of external conduit repair for complex heart anomalies.
- To assess the impact of different conduit materials on patient survival.
- To identify factors influencing actuarial survival rates post-conduit repair.
Summary:
- Eighty-five patients underwent external conduit repair for complex heart anomalies between 1970 and 1984.
- Various conduit materials were utilized, including aortic homografts, porcine valved conduits, glutaraldehyde-treated conduits, Hancock composite grafts, and glutaraldehyde-treated pericardial conduits.
- Actuarial survival rates were 87% at five years and 82% at ten to fourteen years for the 61 surviving patients.
Impact:
- Right ventricular systolic pressure post-repair is a critical determinant of long-term survival, with pressures <80 mmHg correlating to 93% 12-year survival versus 65% at 14 years for pressures >80 mmHg.
- Conduit material selection, prevention of infectious endocarditis, and management of pseudoendothelial proliferation remain key challenges for future research and clinical practice.
Abstract:
Between January 1970 and March 1984, external conduit repair was performed in eighty-five consecutive patients for various complex anomalies. The age at operation ranged from 2 months to 47 years, and 41 patients were in an age group of 5 to 9 years. Among 85 complex anomalies, 20 cases of d-transposition with VSD + PS, 33 cases of Tetralogy of Fallot with pulmonary atresia, 11 cases of truncus arteriosus and 11 cases of 1-transposition were included. From January 1970 to December 1975, conduits used were aortic homograft in 1, formalin treated porcine valved conduits in 27, and valved conduits treated with 0.65% glutaraldehyde in 3 and from January 1976 to November 1982, 42 Hancock composite grafts were used. Since December 1982, valved conduits made of preserved pericardium treated with glutaraldehyde were employed. In sixty-one patients survived from operation, actuarial survival rate was calculated as 87% at five years, 82% at ten to fourteen years. However, systolic pressure of right ventricle after repair mostly affected actuarial survival rate which maintained 93% at twelve years in patients with systolic pressure lower than 80 mmHg, and reduced to 65% at fourteen years in patients with that higher than 80 mmHg. Although external conduit repair was valuable for surgical treatment in complex anomalies, proper selection of conduit material, prevention of infectious endocarditis, and pseudoendothelial proliferation in late stage were the problems to be solved in the future.