Computational Investigation of a Self-Powered Fontan Circulation

Area of Science:

• Cardiovascular Surgery
• Pediatric Cardiology
• Biomedical Engineering

Background:

• Children with single ventricle physiology require complex surgical palliation.
• The Fontan operation is a common procedure, but leads to elevated central venous pressure and inadequate ventricular preload.
• These complications contribute to significant long-term morbidity in Fontan patients.

Purpose of the Study:

• To investigate the potential of an "injection jet" (IJS) system to improve hemodynamics in Fontan circulation.
• To assess if IJS can reduce elevated central venous pressure and enhance ventricular preload.
• To evaluate the impact of IJS on systemic oxygen delivery.

Main Methods:

• Utilized a tightly-coupled, multi-scale computational fluid dynamics (CFD) model.
• Simulated the Fontan circulation with and without the proposed injection jet system.
• Analyzed hemodynamic parameters including central venous pressure, pulmonary blood flow, and ventricular preload.

Main Results:

• An optimally configured IJS demonstrated the ability to lower central venous pressure by 3 mmHg.
• The IJS enhanced pulmonary blood flow and ventricular preload.
• Systemic oxygen delivery was increased with the IJS implementation.

Conclusions:

• The injection jet system shows promise as a surgical modification to improve Fontan circulation hemodynamics.
• Even a small reduction in venous pressure may have substantial clinical benefits for Fontan patients.
• Further investigation and clinical trials are warranted to validate these findings and assess patient outcomes.