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Related Experiment Videos

Structure-function relationship in the AV junction.

Igor R Efimov1, Vladimir P Nikolski, Florence Rothenberg

  • 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA. efimov@wustl.edu

The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology
|September 16, 2004
PubMed
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The atrioventricular node

Area of Science:

  • Cardiovascular Physiology
  • Cardiac Electrophysiology
  • Molecular Cardiology

Background:

  • The atrioventricular node (AVN) is critical for cardiac electrical conduction, controlling atrial-to-ventricular signal transmission.
  • The AVN's function is vital in both normal heart rhythm and pathological conditions like arrhythmias.
  • The AV junction is implicated in reentry circuits and can act as a pacemaker during sinoatrial node dysfunction.

Purpose of the Study:

  • To investigate the structure-function relationship of the AV junction during normal conduction, reentry, and junctional rhythm.
  • To identify molecular and structural heterogeneity underlying AVN conduction properties.
  • To elucidate the mechanisms of AV nodal reentrant arrhythmogenesis.

Main Methods:

  • Utilized fluorescent imaging with voltage-sensitive dyes.

Related Experiment Videos

  • Employed immunohistochemistry to analyze molecular markers.
  • Studied rabbit hearts to examine AV junctional properties.

    • Main Results:

    • Identified molecular and structural heterogeneity in the AV junction, supporting dual-pathway conduction.
    • Observed differential expression of connexin isoforms (Cx43, Cx45, Cx40) in the AV junction.
    • Located the origin of junctional rhythm in the posterior extension of the AV node in 79% of hearts, expressing HCN4 and neurofilament 160.

    Conclusions:

    • Heterogeneity in gap junction and ion channel expression governs AV junction conduction, reentrant arrhythmias, and spontaneous rhythm in rabbits.
    • Uniform neurofilament expression indicates AV nodal posterior extensions are integral to the cardiac conduction system.
    • Differential connexin isoform expression explains longitudinal dissociation, dual-pathway electrophysiology, and AV nodal reentrant arrhythmogenesis.