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Physiological Fontan Procedure.

Antonio F Corno1, Matt J Owen1, Andrea Cangiani2

  • 1University of Leicester, Leicester, United Kingdom.

Frontiers in Pediatrics
|June 11, 2019
PubMed
Summary
This summary is machine-generated.

A modified Fontan circulation, directing blood flow more physiologically, significantly reduces energy loss and pressure. This improved hemodynamics may mitigate long-term complications of the Fontan procedure.

Keywords:
Fontan procedurecomputational fluid dynamicscongenital heart defectscongenital heart surgeryflow modelingperformance predictionphysiological designuniventricular heart

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Area of Science:

  • Cardiovascular Surgery
  • Pediatric Cardiology
  • Medical Engineering

Background:

  • The conventional Fontan procedure redirects systemic venous return, creating suboptimal hemodynamics.
  • Understanding the hemodynamic impact of altered Fontan pathway configurations is crucial for improving patient outcomes.

Purpose of the Study:

  • To compare the hemodynamics of a "physiological" Fontan pathway with the conventional approach using computational fluid dynamics.
  • To determine if a modified flow distribution offers a more favorable hemodynamic profile.

Main Methods:

  • Developed an in-silico 3D model of the Fontan procedure with idealized vascular geometries.
  • Performed finite-volume incompressible steady flow simulations assuming laminar blood flow.
  • Analyzed mean inferior vena cava (IVC) pressure, energy loss rate, and peak kinetic energy.

Main Results:

  • The physiological Fontan showed a 0.2 mmHg reduction in mean IVC pressure.
  • Energy loss rate was reduced by 16% (5.55 vs. 6.61 mW).
  • Maximum kinetic energy decreased by 29% (283 vs. 396 J/m³).

Conclusions:

  • A physiological Fontan circulation leads to reduced mean IVC pressure, energy loss, and peak kinetic energy.
  • These hemodynamic improvements suggest potential benefits in reducing long-term Fontan-associated morbidities.
  • Further clinical studies are needed to assess the impact on liver failure and protein-losing enteropathy.