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Target Flow-Pressure Operating Range for Designing a Failing Fontan Cavopulmonary Support Device
IEEE Transactions on Bio-Medical Engineering
|February 21, 2020
Summary
Mechanical circulatory support shows promise for failing Fontan circulation. This study identified optimal hydraulic operating regions for cavopulmonary assist devices to improve hemodynamics in single ventricle defects.
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
- Pediatric Cardiology
Background:
- The Fontan operation, a palliative surgery for single ventricle defects, often leads to late complications and circulatory failure.
- Mechanical circulatory support presents a potential strategy to augment the failing Fontan circulation by compensating for the absent subpulmonary ventricle.
Purpose of the Study:
- To determine the optimal hydraulic operating regions for designing cavopulmonary assist devices.
- To evaluate the potential of mechanical support in stabilizing failing Fontan circulations.
Main Methods:
- Numerical analysis integrated with clinical data to simulate failing Fontan scenarios.
- Investigated cavopulmonary support configurations: inferior vena cava (IVC) assist and full assist.
- Clustered head pressures and pump flows yielding hemodynamic improvement across simulated failing Fontan physiologies.
Main Results:
- Identified specific hydraulic operating regions crucial for cavopulmonary assist device design.
- Inferior vena cava (IVC) support demonstrated benefit in a limited subset of failing Fontan scenarios.
- Cavopulmonary assist devices could enhance cardiac index by 35% and reduce inferior vena cava pressure by 45%.
Conclusions:
- The identified flow-pressure operating regions provide performance criteria for designing new cavopulmonary assist devices.
- These criteria can also guide the evaluation of existing left-side blood pumps for off-label use in failing Fontan patients.
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