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Ventricular Endocardial Tissue Geometry Affects Stimulus Threshold and Effective Refractory Period.

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Summary

Cardiac tissue architecture influences electrical excitability and afterdepolarization capture. Endocardial ridges are more excitable than grooves, impacting arrhythmia mechanisms and pacing strategies.

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Area of Science:

  • Cardiac electrophysiology
  • Biophysics
  • Computational modeling

Background:

  • Understanding electrical stimulus-induced cardiac tissue activation is crucial for electrophysiology and arrhythmia research.
  • Previous models suggested tissue architecture modulates excitability, affecting stimulus current and effective refractory period (ERP).

Purpose of the Study:

  • To experimentally validate structural modulation of cardiac tissue excitability.
  • To use computational models for mechanistic understanding of electrotonic loading.
  • To demonstrate implications for afterdepolarization capture.

Main Methods:

  • Experiments on rabbit ventricular wedge preparations.
  • Stimulus capture threshold and effective refractory period (ERP) measurements on endocardial ridges and grooves.
  • Computational bidomain modeling of idealized endocardial structures.

Main Results:

  • Endocardial ridges exhibited a lower stimulus capture threshold (24% reduction) and shorter ERP compared to grooves.
  • Computational models confirmed that structural modulation of electrotonic loading, related to surface curvature, drives these excitability differences.
  • Delayed afterdepolarizations were more likely to be captured in endocardial ridges.

Conclusions:

  • Cardiac tissue's endocardial architecture significantly influences electrical excitability and stimulus capture.
  • Findings provide mechanistic insights into focal-trigger-induced arrhythmias and inform novel pacing strategies like optogenetics.
  • Endocardial ridges show preferential vulnerability to afterdepolarization capture, offering critical understanding for arrhythmia mechanisms.