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A Translational Paradigm for Univentricular Heart Disease: Single-Stage Neonatal Repair with Adaptive Control of
Paulo Cesar Duarte Junior1,2, Martin Poulsen Kessler3, Alessandro Cavalcanti Lianza4
1Department of Bioengineering, Dante Pazzanese Institute of Cardiology, São Paulo, Brazil. paulo.duarte@dantepazzanese.org.br.
Insights
A novel single-stage surgical approach for univentricular heart defects shows promise. This strategy uses a tissue-engineered graft and flow control valve to gradually modulate blood flow, potentially improving outcomes for pediatric cardiovascular surgery patients.
Area of Science:
- Pediatric Cardiovascular Surgery
- Biomedical Engineering
- Computational Fluid Dynamics
Background:
- Univentricular heart defects present significant surgical challenges.
- Traditional multi-stage palliation involves risks, costs, and patient burden.
- A single-stage approach with advanced technology is proposed to mitigate these issues.
Purpose of the Study:
- To evaluate the hemodynamic feasibility of a novel single-stage surgical strategy for univentricular heart defects.
- To assess the potential of a tissue-engineered vascular graft and differential flow control valve for adaptive cavopulmonary flow modulation.
Main Methods:
- A 3D computational fluid dynamics model of the total cavopulmonary connection was developed.
- Simulations were performed with progressive fenestration reduction (14 to 0 mm) under neonatal physiological conditions.
- Flow distribution, pressure gradients, and hemodynamic equilibrium were analyzed.
Main Results:
- Gradual fenestration reduction successfully redistributed venous flow towards pulmonary perfusion.
- Systemic venous pressure increased from 4.2 to 10.6 mmHg as fenestration decreased.
- An intermediate fenestration range (5-6 mm) achieved balanced pulmonary perfusion and venous diversion.
Conclusions:
- The proposed single-stage strategy demonstrates hemodynamic feasibility for progressive cavopulmonary flow modulation.
- This proof-of-concept highlights the potential of integrating tissue engineering, adaptive flow control, and computational modeling.
- The findings provide a foundation for future translational research in treating univentricular heart defects.
Background:
Univentricular heart defects remain one of the greatest challenges in pediatric cardiovascular surgery. Although well-established, the traditional approach consisting of three serial palliative procedures (Norwood, Glenn, and Fontan) entails cumulative risks, repeated hospitalizations, high healthcare costs, and significant psychosocial impact. This study proposes a single-stage neonatal surgical strategy integrating a tissue-engineered vascular graft and a differential flow control valve to enable adaptive and gradual modulation of cavopulmonary flow, avoiding abrupt physiological transitions. To evaluate the hemodynamic feasibility of the proposed concept, a three-dimensional computational fluid dynamics model was developed and analyzed under controlled flow conditions.
Methods:
A three-dimensional model of the total cavopulmonary connection was developed to evaluate the hemodynamic feasibility of the surgical proposal. The fenestration diameter was reduced from 14 to 0 mm, representing progressive hemodynamic conditions. Computational fluid dynamics simulations were conducted under standardized physiological conditions, with neonatal pulmonary vascular resistance represented by porous zones. Flow distributions, pressure gradients, and hemodynamic equilibrium points were evaluated.
Results:
Progressive reduction of fenestration diameter from 14 to 0 mm promoted gradual redistribution of venous flow from predominant right atrial diversion to predominant pulmonary perfusion. Systemic venous pressure increased from 4.2 to 10.6 mmHg as fenestration diameter decreased. An intermediate functional range between 5 and 6 mm provided a balanced distribution between pulmonary perfusion and right atrial diversion, consistent with an intermediate cavopulmonary flow condition.
Conclusion:
Within the assumptions of this proof-of-concept computational model, the proposed strategy demonstrated hemodynamic feasibility for progressive cavopulmonary flow modulation. By integrating tissue engineering, adaptive flow control, and computational modeling, the proposed concept provides a foundation for future patient-specific, experimental, and translational investigations in the treatment of univentricular heart defects.
