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A new multi-scale simulation model of the circulation: from cells to system
Eun Bo Shim1, Chae Hun Leem, Yasuyuki Abe
1Department of Mechanical and Biomedical Engineering, Kangwon National University, Hyoja-dong, Chuncheon, Kangwon 200-701, South Korea.
Summary
We created a multi-scale cardiovascular model linking cardiac cell mechanics to circulatory dynamics. This model accurately simulates heart function and pressure dynamics, offering insights into cardiac electrophysiology and hemodynamics.
Area of Science:
- Cardiovascular Physiology
- Computational Biology
- Biophysics
Background:
- Understanding the interplay between cellular events and overall cardiovascular hemodynamics is crucial for diagnosing and treating heart conditions.
- Existing models often focus on either cellular mechanisms or systemic circulation, lacking a comprehensive multi-scale approach.
Purpose of the Study:
- To develop and validate a multi-scale cardiovascular model integrating human ventricular cell excitation-contraction coupling with a lumped circulation model.
- To investigate the relationship between cellular processes and systemic blood pressure dynamics.
- To analyze the impact of cellular-level changes on cardiac and circulatory system function.
Main Methods:
- Developed a human ventricular cell model simulating excitation-contraction coupling.
- Integrated the cell model with a lumped circulation model using a thin-walled hemispheric ventricle geometry and Laplace's law.
- Simulated hemodynamic properties, left ventricular volume-pressure loops, and the effects of altered L-type calcium channel conductance and pacing frequency.
Main Results:
- The multi-scale model accurately reproduced typical heart mechanics, including pressure-volume relationships and stroke volume.
- Simulations demonstrated the model's ability to link cellular changes (e.g., calcium channel conductance) to systemic effects (e.g., left ventricular pressure).
- The model successfully captured the influence of pacing frequency on both cellular and circulatory system dynamics.
Conclusions:
- The developed multi-scale cardiovascular model provides a robust platform for studying heart mechanics from the cellular to the systemic level.
- The model effectively simulates cardiac electrophysiology and hemodynamics, offering valuable insights into cardiovascular function and disease.
- This integrated approach facilitates the investigation of cell-circulation coupling and the effects of interventions on cardiovascular performance.
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