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Related Experiment Videos

Modelling passive cardiac conductivity during ischaemia.

J G Stinstra1, S Shome, B Hopenfeld

  • 1Scientific Computing & Imaging Institute, University of Utah, Salt Lake City, USA. jeroen@cvrti.utah.edu

Medical & Biological Engineering & Computing
|April 6, 2006
PubMed
Summary

This study models cardiac tissue during ischemia, revealing how interstitial space collapse reduces conductivity and increased gap junction resistance significantly impacts electrical function. These findings help understand electrical changes in the ischemic heart.

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Area of Science:

  • Computational Biology
  • Cardiac Electrophysiology
  • Biophysics

Background:

  • Ischemia significantly alters cardiac tissue structure and electrical properties.
  • Understanding these changes is crucial for diagnosing and treating heart conditions.
  • Previous studies report morphological and electrical changes during ischemia but lack detailed computational analysis.

Purpose of the Study:

  • To computationally model cardiac tissue under ischemic conditions.
  • To calculate bidomain conductivity tensors during three phases of ischemia.
  • To correlate simulated changes with reported literature values.

Main Methods:

  • A geometric model of cardiac tissue with 64 myocytes (2 million tetrahedral elements) was developed.
  • Ischemic conditions were simulated by altering interstitial space, cell swelling, and gap junction resistance.

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  • The finite element method was used to compute current density under an external electric field.

    • Main Results:

    • Reduced interstitial space decreased extracellular longitudinal conductivity by ~20%.
    • Moderate cell swelling (10-20%) had minimal impact on extracellular conductivity.
    • A ten-fold increase in gap junction resistance simulated the significant drop in tissue conductance during late-stage ischemia.

    Conclusions:

    • Interstitial space collapse is a primary driver of conductivity reduction in early ischemia.
    • Gap junction closure significantly impairs electrical propagation in later stages of ischemia.
    • The model accurately reproduces reported changes in cardiac conductivity and conductance during ischemia.