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The effect of the fiber curvature gradient on break excitation in cardiac tissue.

BACKGROUND: Break excitation has been hypothesized as a mechanism for the initiation of reentry in cardiac tissue. One way break excitation can occur is by virtual electrodes formed due to a curving fiber geometry. In this article, we are concerned with the relationship between the peak gradient of...

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Published in:Pacing & Clinical Electrophysiology Vol. 29; no. 5; pp. 496 - 502
Main Authors: Beaudoin DL, Roth BJ
Format: equations & formulas pictorial research tables/charts Journal Article
Published: Wiley-Blackwell May2006
Online Access:View this record in EBSCOhost
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      dt: May2006
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      pub: Wiley-Blackwell
      place: Malden, Massachusetts
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        atl: The effect of the fiber curvature gradient on break excitation in cardiac tissue.
      aug:
        au:
          Beaudoin DL
          Roth BJ
        affil: Department of Physics, Oakland University, Rochester, Michigan
      sug:
        subj:
          Heart Conduction System Physiopathology
          Myocardium Physiopathology
          Electrodes
          Electrophysiology
          Experimental Studies
          Membrane Potentials
          Simulations
          Human
      ab: BACKGROUND: Break excitation has been hypothesized as a mechanism for the initiation of reentry in cardiac tissue. One way break excitation can occur is by virtual electrodes formed due to a curving fiber geometry. In this article, we are concerned with the relationship between the peak gradient of fiber curvature and the threshold for break stimulation and the initiation of reentry. METHODS: We calculate the maximum gradient of fiber curvature for different scales of fiber geometry in a constant tissue size (20x20 mm), and also examine the mechanisms by which reentry initiation fails. RESULTS: For small peak gradients, reentry fails because break excitation does not occur. For larger peak gradients, reentry fails because break excitation fails to develop into full-scale reentry. For strong stimuli above the upper limit of vulnerability, reentry fails because the break excitation propagates through the hyperpolarized region and then encounters refractory tissue, causing the wave front to die.
      pubtype: Academic Journal
      doctype:
        equations & formulas
        pictorial
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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