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Related Experiment Videos

Recovery from heart failure: structural and functional analysis in a canine model.

R J Howard1, T P Stopps, G W Moe

  • 1Department of Medicine, St. Michael's Hospital, Toronto, Ont., Canada.

Canadian Journal of Physiology and Pharmacology
|December 1, 1988
PubMed
Summary

This study shows that rapid ventricular pacing in dogs causes congestive heart failure, with significant cardiac changes and electrolyte imbalances. Recovery occurred within a week, though cardiac dilation persisted.

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Area of Science:

  • Cardiology
  • Veterinary Medicine
  • Heart Failure Research

Background:

  • Chronic, rapid ventricular pacing is a known method to induce congestive heart failure in animal models.
  • Understanding the progression and recovery patterns of pacing-induced heart failure is crucial for developing effective treatments.

Purpose of the Study:

  • To analyze the echocardiographic features of developing heart failure in dogs induced by rapid ventricular pacing.
  • To assess the recovery capacity of this canine model after pacing cessation.

Main Methods:

  • Fifteen dogs were studied, with nine subjected to rapid ventricular pacing (250 bpm) and six serving as sham controls.
  • Two-dimensional echocardiography was used to monitor cardiac dimensions, ejection fraction, and left ventricular wall thickness.

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  • Serum electrolytes and renal function markers (blood urea nitrogen, creatinine) were analyzed.

    • Main Results:

    • Paced dogs developed severe heart failure, evidenced by increased diastolic cardiac area, decreased ejection fraction, and thinned ventricular walls.
    • Significant increases in heart rate, respiratory rate, and body weight were observed, alongside decreased serum sodium and increased blood urea nitrogen and creatinine.
    • Recovery was rapid, with most parameters normalizing within one week, except for persistent cardiac dilation up to four weeks post-pacing.

    Conclusions:

    • Rapid ventricular pacing effectively models congestive heart failure in dogs, exhibiting characteristic echocardiographic and biochemical changes.
    • The canine model demonstrates significant recovery potential after pacing cessation, with most physiological parameters returning to normal.
    • Persistent cardiac dilation post-recovery highlights potential long-term structural changes in pacing-induced heart failure.