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Cardiac alternans annihilation by distributed mechano-electric feedback (MEF)
Dipen Deshpande1, Youssef Belhamadia, Stevan Dubljevic
1Dept. of Chemical and Materials Engg, Faculty of Engineering, University of Alberta, T6G 2V4 Canada. dipen@ualberta.ca
Summary
This study shows how mechanical force can stop irregular heartbeats called cardiac alternans. Researchers used computational models to explore new ways to control heart muscle contractions and improve cardiac function.
Area of Science:
- Computational Biology
- Biophysics
- Cardiovascular Physiology
Background:
- Electrical alternans cause irregular heart muscle contractions via excitation-contraction coupling.
- Understanding and controlling cardiac alternans is crucial for preventing arrhythmias.
Purpose of the Study:
- To demonstrate the annihilation of cardiac alternans using mechanical perturbation.
- To explore novel control strategies for cardiac alternans in realistic heart tissue models.
Main Methods:
- Utilized the Luo-Rudy-1 (LR1) model with ionic currents for realistic tissue simulations.
- Implemented a hybrid control algorithm combining electrical pacing and calcium perturbation.
- Employed a Nash Panfilov model coupled with stress equilibrium equations to investigate mechanical influences.
Main Results:
- Successfully demonstrated the annihilation of cardiac alternans through applied mechanical perturbation.
- The combined electrical and calcium-based control effectively regulated contractile alternans.
- The novel Nash Panfilov model revealed active stress as a key factor in alternans control.
Conclusions:
- Mechanical perturbation offers a viable strategy for eliminating cardiac alternans.
- Hybrid control approaches show promise for managing irregular heart rhythms.
- Further research into mechanical-electrical coupling in cardiac tissue is warranted.
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