Integrative Computational Modeling of Cardiomyocyte Calcium Handling and Cardiac Arrhythmias: Current Status and
Henry Sutanto1,2, Jordi Heijman1
1Department of Cardiology, CARIM School for Cardiovascular Diseases, Maastricht University, 6229 ER Maastricht, The Netherlands.
Insights
Altered cardiomyocyte calcium handling can cause cardiac arrhythmias. Integrative computational modeling helps reveal how these calcium-handling defects lead to heart rhythm problems at multiple biological scales.
Area of Science:
- Cardiovascular Physiology
- Computational Biology
- Cardiac Electrophysiology
Background:
- Cardiomyocyte calcium handling is crucial for cardiac excitation-contraction coupling and normal heart function.
- Abnormalities in calcium handling are a significant cause of cardiac arrhythmias.
- Studying these complex calcium dynamics experimentally is challenging.
Purpose of the Study:
- To explore the role of integrative computational modeling in understanding calcium-handling abnormalities and arrhythmogenesis.
- To demonstrate how multiscale modeling can elucidate the mechanisms of cardiac arrhythmias caused by calcium dysregulation.
Main Methods:
- Utilizing multiscale computational modeling to simulate cardiomyocyte calcium dynamics.
- Integrating experimental data with computational models.
- Analyzing calcium handling at subcellular, cellular, and tissue levels.
Main Results:
- Computational models can reveal the arrhythmogenic consequences of altered cardiac calcium handling.
- Multiscale modeling provides insights into localized and dynamic calcium interactions.
- The approach bridges the gap between experimental observations and mechanistic understanding.
Conclusions:
- Integrative computational modeling is a powerful tool for studying calcium-mediated arrhythmogenesis.
- This approach facilitates a deeper understanding of the link between calcium handling and cardiac arrhythmias.
- Future work should focus on integrating and interpreting complex computational data for clinical relevance.
Abstract:
Cardiomyocyte calcium-handling is the key mediator of cardiac excitation-contraction coupling. In the healthy heart, calcium controls both electrical impulse propagation and myofilament cross-bridge cycling, providing synchronous and adequate contraction of cardiac muscles. However, calcium-handling abnormalities are increasingly implicated as a cause of cardiac arrhythmias. Due to the complex, dynamic and localized interactions between calcium and other molecules within a cardiomyocyte, it remains experimentally challenging to study the exact contributions of calcium-handling abnormalities to arrhythmogenesis. Therefore, multiscale computational modeling is increasingly being used together with laboratory experiments to unravel the exact mechanisms of calcium-mediated arrhythmogenesis. This article describes various examples of how integrative computational modeling makes it possible to unravel the arrhythmogenic consequences of alterations to cardiac calcium handling at subcellular, cellular and tissue levels, and discusses the future challenges on the integration and interpretation of such computational data.
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