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Related Experiment Videos

A Method for In Vitro TCPC Compliance Verification.

Mike Tree1, Zhenglun Alan Wei2, Brady Munz3

  • 1The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332.

Journal of Biomechanical Engineering
|April 19, 2017
PubMed
Summary
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This study developed a method to create accurate flexible models of the total cavopulmonary connection (TCPC) for Fontan procedure research. These patient-specific models improve the hemodynamic simulation of single ventricle congenital heart defects.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Medical Device Modeling

Background:

  • The Fontan procedure is a critical palliative surgery for single ventricle congenital heart defects.
  • Understanding hemodynamics in the total cavopulmonary connection (TCPC) is vital for predicting Fontan patient outcomes.
  • Existing in vitro models often use rigid TCPC designs, limiting their physiological relevance.

Purpose of the Study:

  • To establish a method for verifying the compliance of in vitro TCPC models using patient-specific data.
  • To develop flexible TCPC models that accurately replicate patient-specific hemodynamic properties.
  • To enhance the accuracy of in vitro hemodynamic modeling for Fontan circulation.

Main Methods:

  • Utilized patient-specific flow and pressure data from phase contrast magnetic resonance imaging (PC-MRI).

Related Experiment Videos

  • Analyzed retrospective pulse-pressure data from a cohort of 10 age-matched patients to determine target compliance.
  • Employed in vitro compliance testing and computational simulations to determine optimal material properties and wall thickness for the TCPC model.

    • Main Results:

    • Determined a patient-specific target compliance of 1.36 ± 0.78 mL/mm Hg.
    • The developed flexible in vitro TCPC model achieved a compliance of 1.37 ± 0.1 mL/mm Hg, within 1% of the patient-specific target.
    • Successfully matched patient-specific total cavopulmonary connection compliance in an in vitro model.

    Conclusions:

    • The presented method accurately verifies in vitro model compliance against patient-specific data.
    • This approach enables the creation of more physiologically accurate flexible TCPC models.
    • Improved patient-specific hemodynamic modeling can lead to better understanding and management of Fontan circulation complications.