Longitudinal analysis of systemic ventricular function and atrioventricular valve function after the Norwood
Stefan Fetcu1,2, Takuya Osawa1,2, Frank Klawonn3,4
1Department of Congenital and Pediatric Heart Surgery, German Heart Center Munich, Technische Universität München, Munich, Germany.
Summary
The modified Blalock-Taussig shunt after the Norwood procedure initially shows worse ventricular function and atrioventricular valve regurgitation. However, after stage II palliation, it demonstrates better ventricular function compared to the right ventricle to pulmonary artery conduit.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease
- Cardiac Surgery
Background:
- The Norwood procedure is a critical first step in single-ventricle palliation for complex congenital heart defects.
- Systemic ventricular function and atrioventricular valve regurgitation are key determinants of long-term outcomes after the Norwood procedure.
- The choice of shunt impacts hemodynamics and subsequent ventricular performance.
Purpose of the Study:
- To longitudinally evaluate systemic ventricular function and atrioventricular valve regurgitation after the neonatal Norwood procedure.
- To compare the effects of two common shunt types: modified Blalock-Taussig shunt and right ventricle to pulmonary artery conduit.
- To understand how shunt type influences hemodynamics across different stages of single-ventricle palliation.
Main Methods:
- Retrospective analysis of serial echocardiographic data from 335 neonates undergoing the Norwood procedure (2001-2020).
- Comparison of ventricular function and atrioventricular valve regurgitation between patients with modified Blalock-Taussig shunt (n=171) and right ventricle to pulmonary artery conduit (n=164).
- Assessment of echocardiograms obtained at various time points before Fontan completion.
Main Results:
- Initially (1-30 days post-Norwood), the right ventricle to pulmonary artery conduit group showed better ventricular function than the modified Blalock-Taussig shunt group.
- After stage II palliation, ventricular function was superior in the modified Blalock-Taussig shunt group compared to the right ventricle to pulmonary artery conduit group.
- Atrioventricular valve regurgitation was more frequent with the modified Blalock-Taussig shunt before stage II, but became comparable after stage II.
Conclusions:
- Shunt type significantly influences hemodynamics and ventricular performance at different stages of single-ventricle palliation.
- The modified Blalock-Taussig shunt is associated with initial poorer ventricular function but better long-term function after stage II compared to the right ventricle to pulmonary artery conduit.
- Understanding these stage-dependent effects is crucial for optimizing surgical strategies and patient outcomes.
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