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Limitations in electrophysiological model development and validation caused by differences between simulations and

Jesús Carro1, José F Rodríguez-Matas2, Violeta Monasterio3

  • 1Universidad San Jorge, Campus Universitario, Autov A23 Km 299, 50830, Villanueva de Gállego, Zaragoza, Spain; Aragon Institute for Engineering Research, Universidad de Zaragoza, Spain; CIBER in Bioengineering, Biomaterials & Nanomedicine (CIBER-BBN), Spain.

Progress in Biophysics and Molecular Biology
|December 1, 2016
PubMed
Summary

This study reveals that current ion channel models often overlook interactions and scale differences, leading to inaccurate predictions. Multiscale simulations are crucial for accurately estimating ion channel dynamics and conductances in cardiac cells.

Keywords:
Action potentialCardiac modelingElectrophysiologyIonic currentsModel validation

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Area of Science:

  • Computational biology
  • Biophysics
  • Cardiovascular research

Background:

  • Current ion channel models often fit isolated cell data, neglecting parameter interactions.
  • Estimating ionic current conductances typically relies on Action Potential (AP) markers, with simulations often using single cells while experiments use tissue.

Purpose of the Study:

  • To explore limitations in current methods for estimating ion channel dynamics and conductances.
  • To demonstrate how multiscale simulations can overcome these limitations by integrating different scales.

Main Methods:

  • Utilized four human ventricular cell models (ten Tusscher & Panfilov 2006, Grandi et al. 2010, O'Hara et al. 2011, Carro et al. 2011).
  • Investigated L-type calcium current (ICa,L) inactivation and ionic conductance contributions to AP markers using multiscale simulations.

Main Results:

  • ICa,L inactivation characteristics varied significantly between model equations and experimental protocol simulations.
  • Substantial discrepancies were observed in ionic current contributions to APD25, Triangulation, Vmax, dV/dtmax, and dV/dtmin between single-cell and 1D-tissue models.

Conclusions:

  • Existing models may inaccurately represent ion channel dynamics and conductances due to scale-dependent effects.
  • Verifying model consistency across simulated and experimental data at all scales is essential for accurate electrophysiological modeling.