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Human-based modelling and simulations are becoming ubiquitous in biomedical science due to their ability to augment experimental and clinical investigations. Cardiac electrophysiology is one of the most advanced areas, with cardiac modelling and simulation being considered for virtual testing of pharmacological therapies and medical devices. Current models present inconsistencies with experimental data, which limit further progress. In this study, we present the design, development, calibration and independent validation of a human-based ventricular model (ToR-ORd) for simulations of electrophysiology and excitation-contraction coupling, from ionic to whole-organ dynamics, including the electrocardiogram. Validation based on substantial multiscale simulations supports the credibility of the ToR-ORd model under healthy and key disease conditions, as well as drug blockade. In addition, the process uncovers new theoretical insights into the biophysical properties of the L-type calcium current, which are critical for sodium and calcium dynamics. These insights enable the reformulation of L-type calcium current, as well as replacement of the hERG current model.

Original publication

DOI

10.7554/eLife.48890

Type

Journal article

Journal

Elife

Publication Date

24/12/2019

Volume

8

Keywords

calibration validation, cell biology, computational biology, computer simulations, heart, human, systems biology, ventricular myocyte, Action Potentials, Algorithms, Biophysics, Calcium, Calcium Channels, Calibration, Computer Simulation, Electrocardiography, Electrophysiological Phenomena, Electrophysiology, Excitation Contraction Coupling, Heart Diseases, Heart Ventricles, Humans, Models, Cardiovascular, Myocytes, Cardiac, Sodium