Simulation of aortopulmonary collateral flow in Fontan patients for use in prediction of interventional outcomes

Research output: Contribution to journalArticle

Abstract

Purpose: Patients with complex congenital heart disease may need to be converted to a Fontan circulation with systemic venous return surgically connected to the pulmonary circulation. These patients frequently form aortopulmonary collaterals (APC), that is arterial inflows to the pulmonary artery vascular tree. The aim of this study was to develop a method to calculate the effect of APC on the pulmonary flow distribution based on magnetic resonance imaging (MRI) measurements and computational fluid dynamics simulations in order to enable prediction of interventional outcomes in Fontan patients.

Methods: Patient-specific models of 11 patients were constructed in a 3D-design software based on MRI segmentations. APC flow was quantified as the difference between pulmonary venous flow and pulmonary artery flow, measured by MRI. A method was developed to include the modulating effect of the APC flow by calculating the patient-specific relative pulmonary vascular resistance. Simulations, including interventions with a Y-graft replacement and a stent dilatation, were validated against MRI results.

Results: The bias between simulated and MRI-measured fraction of blood to the left lung was 29 53%. Including the effects of the APC flow in the simulation (n = 6) reduced simulation error from 98 70% to 52 63%. Preliminary findings in two patients show that the effect of surgical and catheter interventions could be predicted using the demonstrated methods.

Conclusions: The work demonstrates a novel method to include APC flow in predictive simulations of Fontan hemodynamics. APC flow was found to have a significant contribution to the pulmonary flow distribution in Fontan patients.

Details

Authors
Organisations
External organisations
  • Skåne University Hospital
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physiology
  • Cardiac and Cardiovascular Systems

Keywords

  • 4D-flow, cardiac magnetic resonance, patient-specific simulation, prediction of invasive interventions, total cavopulmonary connection
Original languageEnglish
Pages (from-to)622-629
Number of pages8
JournalClinical Physiology and Functional Imaging
Volume38
Issue number4
Early online date2017 Aug 7
Publication statusPublished - 2018 Jul
Publication categoryResearch
Peer-reviewedYes