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Open-thorax guinea pig model for defibrillation.

J N Eynard1, R A Malkin

  • 1Department of Comparative Medicine, The University of Tennessee-Memphis, USA.

Laboratory Animal Science
|January 19, 2000
PubMed
Summary

Researchers developed a sustained ventricular fibrillation (VF) model in guinea pigs. Larger guinea pigs (>1,021 g) showed a greater ability to sustain and survive VF, indicating their utility for VF research.

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Area of Science:

  • Cardiovascular Research
  • Animal Models
  • Electrophysiology

Background:

  • Ventricular tachyarrhythmias (VT) in guinea pig models are often transient.
  • A need exists for a reliable model of sustained ventricular fibrillation (VF).

Purpose of the Study:

  • To develop and characterize an open-thorax guinea pig model of sustained ventricular fibrillation (VF).
  • To assess the feasibility of using guinea pigs for VF and defibrillation studies.

Main Methods:

  • Bilateral thoracotomy was performed on eight guinea pigs.
  • Two pacing methods (normal and rapid) were used to induce VF.
  • Blood pressure was monitored to define VF (mean <10 mm Hg).

Main Results:

  • Both pacing methods successfully induced VF in the guinea pig model.
  • A significant correlation was found between body weight (>1,021 g) and VF sustainment/survival.
  • The model demonstrated sustained VF suitable for further study.

Conclusions:

  • The developed open-thorax guinea pig model provides sustained ventricular fibrillation.
  • Guinea pigs are a viable rodent model for investigating VF and defibrillation.
  • Body weight is a critical factor for successful VF induction and survival in this model.

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