Key result
T-World cardiomyocyte model simulates arrhythmia mechanisms, revealing increased female proclivity to early afterdepolarizations.
Why the study?
Existing human cardiomyocyte models reproduce only a few arrhythmia-driving behaviors and show discrepancies with experimental data, limiting their predictivity and translational utility.
The T-World virtual human cardiomyocyte model provides a highly predictive, open-source tool for investigating the cellular determinants of arrhythmogenesis and sex-specific electrophysiological differences.
No takes yet. Share an insight, caveat, or question.
No immediate impact on clinical arrhythmia management; extends computational tools to investigate human ventricular arrhythmogenesis.
Background: Cardiovascular disease is the leading global cause of morbidity and mortality. New technologies are needed to improve mechanistic understanding and inform therapeutic strategies. Human-centric cardiac simulations show great promise; however, existing cellular models can reproduce only a few arrhythmia-driving behaviors and show important discrepancies with experimental data. We aimed to develop a new model overcoming this lack of generality, which markedly limits the predictivity and translational utility of virtual cardiomyocytes. Methods: We developed T-World, a novel virtual human cardiomyocyte, using data-driven differential equations to describe sex-specific excitation-contraction coupling, mechanical contraction, β-adrenergic signaling, and its effects on cellular targets. The model contains several key innovations, including a new approach to coupling L-type calcium channels and ryanodine receptors, with updated calcium-dependent-inactivation of the former and novel calcium-induced refractoriness and complete reparameterization of the latter. We also redeveloped the sodium-potassium pump and made major improvements to the sodium-calcium exchanger formulation. Results: T-World shows broad agreement with experimental data on rate-dependent action potential (AP), calcium handling, and contraction properties. Extensively validated on independent data, T-World demonstrates strong predictive performance, for example, in drug-induced AP changes. The model reproduces the effects of sympathetic stimulation, including AP duration shortening and increased calcium-transient amplitude and contractility. Importantly, it recapitulates for the first time all key cellular mechanisms driving life-threatening arrhythmias (early and delayed afterdepolarizations, alternans, and steep S1-S2 restitution), including experimentally observed responses to interventions such as sympathetic activation, SERCA (sarco/endoplasmic reticulum Ca 2+ ATPase) inhibition, and AP prolongation. Combined with the model’s ability to simulate physiological sex-specific differences in electrophysiology, this revealed increased proclivity of female cardiomyocytes to early afterdepolarizations and steep restitution of AP duration. Conclusions: T-World is a highly general and predictive open-source computer model of a human ventricular cardiomyocyte, suitable for multiscale research studies investigating determinants of arrhythmogenesis.
Tomek et al. (2026) studied Cardiovascular disease. T-World virtual human cardiomyocyte model was evaluated on Model performance in reproducing experimental data on action potential, calcium handling, contraction properties, and arrhythmogenesis. The T-World virtual human cardiomyocyte model successfully reproduced experimental data on action potentials, calcium handling, and key cellular mechanisms driving life-threatening arrhythmias.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: