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Related Experiment Videos

Bradycardia-mediated ventricular electrical remodeling.

Gil J Gross1

  • 1Division of Cardiology, Hospital for Sick Children, Hospital for Sick Children Research Institute, Department of Pediatrics and Heart & Stroke/Richard Lewar Centre of Excellence, University of Toronto, Toronto, Canada. ggross@sickkids.ca

Journal of Cardiovascular Electrophysiology
|May 12, 2006
PubMed
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Bradycardic states induce early myocardial electrical remodeling, characterized by QT interval prolongation and altered K+ currents. Ventricular activation rate is the key determinant of this bradycardic remodeling.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Molecular Cardiology

Background:

  • Bradycardia (slow heart rate) is linked to myocardial electrical remodeling.
  • This remodeling can predispose the heart to dangerous ventricular arrhythmias.

Purpose of the Study:

  • To investigate if ventricular activation rate dictates early electrical remodeling during bradycardia.
  • To establish a novel rabbit model of complete heart block (CHB).

Main Methods:

  • Induction of CHB via transcatheter radiofrequency AV node ablation in rabbits.
  • Chronic ventricular pacing at physiological (280 bpm) or bradycardic (140 bpm) rates.
  • Sham ablation and non-paced controls for comparison.

Main Results:

Related Experiment Videos

  • Early electrical remodeling occurred within 8 days in bradycardic animals only.
  • Significant QT interval prolongation observed in bradycardic group.
  • Biventricular downregulation of IKr and IKs delayed rectifier K+ currents.

Conclusions:

  • Ventricular activation rate is a primary determinant of early bradycardic electrical remodeling.
  • CHB at bradycardic rates induces specific changes in ion channel function.
  • Findings contribute to understanding heart rate-dependent myocardial remodeling.