April 1, 2000AJP Heart and Circulatory Physiology
Action potential propagation in inhomogeneous cardiac tissue: safety factor considerations and ionic mechanism
Population
Computational model of the ventricular myocyte in a multicellular fiber
Design
Preclinical
Authors
Discussion
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Implication
May inform arrhythmia risk in heterogeneous tissue; leaves open clinical translation pending in vivo validation.
Key Points
- This research aims to analyze how variations in cardiac tissue structure affect action potential propagation and safety factor.
- Detailed modeling of ventricular myocytes in multicellular fiber.
- Quantitative computation of conduction safety factor (SF) based on tissue characteristics.
- Investigation of sodium and L-type calcium currents during conduction.
- Safety factor (SF) declines in regions with increased electrical load, indicating possible conduction failure.
- Calcium current (I(Ca(L))) plays a significant role in the conduction across inhomogeneous regions.
- Modulation of I(Na) or I(Ca(L)) can lead to unidirectional block within these inhomogeneous areas.
Structured PICO
P
Population
Computational model of the ventricular myocyte in a multicellular fiber
I
Intervention
Modulation of electrical load (tissue expansion, increased gap junction coupling, reduced excitability, hyperkalemia) and ionic currents (I(Na) or I(Ca(L)) blockade or calcium overload)
O
Outcome
Safety factor (SF) of conduction and the kinetics/contribution of sodium current (I(Na)) and L-type calcium current (I(Ca(L)))surrogate
Computational modeling demonstrates that action potential propagation across inhomogeneous cardiac tissue relies heavily on L-type calcium currents to compensate for suppressed sodium currents.
Cite This Study
Wang et al. (2000) studied this question.