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Transcutaneous pacing in a hypothermic-dog model

R G Dixon1, J M Dougherty, L J White

  • 1Emergency Medicine Residency Program, Akron General Medical Center, OH, USA.

Annals of Emergency Medicine
|May 1, 1997
PubMed
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Transcutaneous pacing (TCP) significantly speeds rewarming from hypothermia in dogs. This method safely restores hemodynamic stability, reducing rewarming time by half without causing myocardial injury.

Area of Science:

  • Cardiovascular Physiology
  • Thermoregulation
  • Emergency Medicine

Background:

  • Hypothermia poses significant risks to hemodynamic stability.
  • Rewarming from hypothermia can be a slow and challenging process.
  • The efficacy of transcutaneous pacing (TCP) during rewarming is not well-established.

Purpose of the Study:

  • To evaluate the hemodynamic response to transcutaneous pacing (TCP) during rewarming from hypothermia.
  • To assess the safety and effectiveness of TCP in facilitating rewarming.
  • To compare rewarming times and hemodynamic parameters between paced and non-paced hypothermic dogs.

Main Methods:

  • Prospective, controlled laboratory study involving 20 mongrel dogs.
  • Dogs were cooled to 27°C core temperature.

Related Experiment Videos

  • Experimental group received TCP during active rewarming; control group received sham pacing.

    • Main Results:

    • TCP group rewarmed significantly faster (171.5 min vs. 254 min, P < .05).
    • Cardiac index returned to 84% of baseline in paced dogs vs. 63% in controls (P < .05).
    • No significant hemodynamic deterioration, lethal arrhythmias, or myocardial injury observed in paced animals.

    Conclusions:

    • Transcutaneous pacing (TCP) is safe, effective, and easily implemented in dogs.
    • TCP restores and maintains hemodynamic stability during rewarming from hypothermia.
    • TCP halved the rewarming time compared to non-paced controls.