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Simulation of the Fontan circulation during rest and exercise
Yvette Koeken1, Theo Arts, Tammo Delhaas
1Department of Biomedical Engineering, Maastricht University, Maastricht, The Netherlands. y.koeken@maastrichtuniversity.nl
Fontan palliation for single-ventricle circulation limits exercise capacity. Increased central venous pressure and inability to lower systemic resistance restrict blood flow in Fontan patients during exercise.
Area of Science:
- Cardiovascular Physiology
- Computational Modeling
- Pediatric Cardiology
Background:
- Fontan palliation creates univentricular serial circulation for complex congenital heart disease.
- Varied pathologies treated by Fontan palliation complicate optimization.
- A computational model can aid in understanding univentricular circulation dynamics.
Purpose of the Study:
- To evaluate the univentricular circulation in rest and exercise using a modified computational model.
- To identify physiological limitations to exercise capacity in Fontan patients.
Main Methods:
- Adjusted a lumped parameter computational model (CircAdapt) of biventricular circulation.
- Simulated beat-to-beat dynamics of univentricular circulation at rest and during exercise.
- Analyzed hemodynamic responses including pressures, flow, and volumes.
Main Results:
- Exercise simulation showed increased stroke volume, heart rate, pulse pressure, and stressed blood volume.
- Central venous pressure rose due to constant pulmonary resistance, reducing systemic pressure drop.
- Limited ability to reduce systemic resistance restricted systemic flow during exercise.
Conclusions:
- Exercise capacity in Fontan patients is limited by elevated central venous pressure.
- Inability to decrease systemic resistance further restricts systemic flow, impacting exercise tolerance.
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