Parameter variations in personalized electrophysiological models of human heart ventricles

PLoS One. 2021 Apr 28;16(4):e0249062. doi: 10.1371/journal.pone.0249062. eCollection 2021.

Abstract

The objectives of this study were to evaluate the accuracy of personalized numerical simulations of the electrical activity in human ventricles by comparing simulated electrocardiograms (ECGs) with real patients' ECGs and analyzing the sensitivity of the model output to variations in the model parameters. We used standard 12-lead ECGs and up to 224 unipolar body-surface ECGs to record three patients with cardiac resynchronization therapy devices and three patients with focal ventricular tachycardia. Patient-tailored geometrical models of the ventricles, atria, large vessels, liver, and spine were created using computed tomography data. Ten cases of focal ventricular activation were simulated using the bidomain model and the TNNP 2006 cellular model. The population-based values of electrical conductivities and other model parameters were used for accuracy analysis, and their variations were used for sensitivity analysis. The mean correlation coefficient between the simulated and real ECGs varied significantly (from r = 0.29 to r = 0.86) among the simulated cases. A strong mean correlation (r > 0.7) was found in eight of the ten model cases. The accuracy of the ECG simulation varied widely in the same patient depending on the localization of the excitation origin. The sensitivity analysis revealed that variations in the anisotropy ratio, blood conductivity, and cellular apicobasal heterogeneity had the strongest influence on transmembrane potential, while variation in lung conductivity had the greatest influence on body-surface ECGs. Futhermore, the anisotropy ratio predominantly affected the latest activation time and repolarization time dispersion, while the cellular apicobasal heterogeneity mainly affected the dispersion of action potential duration, and variation in lung conductivity mainly led to changes in the amplitudes of ECGs and cardiac electrograms. We also found that the effects of certain parameter variations had specific regional patterns on the cardiac and body surfaces. These observations are useful for further developing personalized cardiac models.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Electrocardiography / methods*
  • Electrocardiography / standards
  • Female
  • Heart Diseases / physiopathology*
  • Heart Ventricles / physiopathology*
  • Humans
  • Male
  • Middle Aged
  • Models, Cardiovascular*
  • Patient-Specific Modeling*

Grants and funding

The development of personalized computer models was performed as part of the project that is supported by the Russian Science Foundation (https://rscf.ru/en/) in the form of a grant awarded to OS (19-14-00134). Computational resources and software development were covered by government assignment for (1) the Institute of Immunology and Physiology, Ural Branch of the Russian Academy of Sciences (https://iip.uran.ru/) in the form of a salary for OS and KU (AAA-A21-121012090093-0) and (2) Ural Federal University (https://urfu.ru/) in the form of a grant awarded to OS (02.A03.21.0006). EP Solutions SA, Yverdon-les-Bains, Switzerland (https://ep-solutions.ch) provided support in the form of a salary for VK and consultancy fees and travel grants awarded to KU. The specific roles of these authors are articulated in the “Author Contributions” section. The funders had no further role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.