Fiber orientation and cell-cell coupling influence ventricular fibrillation dynamics

Bum Rak Choi, Tong Liu, Mitra Lavasani, Guy Salama*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Introduction: The structure of ventricular fibrillation (VF) is influenced by regional differences in action potential durations and perhaps restitution kinetics and fiber anisotropy. The spatial organization of VF was investigated by measuring the cross-correlation (CC) and mutual information (MI) of membrane potential (Vm) oscillations recorded from multiple sites. Methods and Results: Rabbit hearts (n = 6) were retrogradely perfused and stained with di-4-ANEPPS, and VF was elicited by burst pacing. Vm oscillations were recorded optically from multiple locations on the epicardium using a 16 × 16 photodiode array or a 72 × 78 CCD camera. The spatial organization of VF was investigated by calculating the maximum CC (CC max) and MI (MImax) that can be obtained between any two sites. CCmax and MImax were extended to all pixels and served as indices of the similarities between Vm transients at a reference pixel and all other pixels on the map. We found that maps of CC max and MImax did not contain discrete regions with high CC or MI. However, CCmax and MImax decreased monotonically with increasing distance between any arbitrarily chosen reference pixel and all other pixels. In VF, maps of CCmax and MImax revealed elliptical gradients of CC and MI that were closely aligned with fiber orientation, with major axis at 127° ± 8° on the left ventricles. Conclusion: CC and MI analysis in fibrillation provides new evidence that anisotropy of fiber orientation and cell-cell coupling have a direct influence on VF dynamics.

Original languageEnglish (US)
Pages (from-to)851-860
Number of pages10
JournalJournal of cardiovascular electrophysiology
Volume14
Issue number8
DOIs
StatePublished - Aug 1 2003

Keywords

  • Cross-correlation
  • Fiber orientation
  • Mutual information
  • Optical mapping
  • Ventricular fibrillation

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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