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Post-anesthetic hyperthermia in cats.

Lysa P Posner1, Robin D Gleed, Hollis N Erb

  • 1Department of Clinical Sciences, VMC College of Veterinary Medicine, Cornell University, Ithaca, NY, USA. lysa_posner@ncsu.edu

Veterinary Anaesthesia and Analgesia
|January 24, 2007
PubMed
Summary

Hydromorphone administration in cats undergoing surgery is linked to post-anesthetic hyperthermia, with elevated temperatures observed in most cases. Close monitoring for fever is recommended for cats receiving hydromorphone.

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Area of Science:

  • Veterinary Anesthesiology
  • Small Animal Surgery
  • Pharmacology

Background:

  • Post-anesthetic hyperthermia is a potential complication in cats.
  • Understanding the influence of anesthetic drug combinations on thermoregulation is crucial for patient safety.

Purpose of the Study:

  • To investigate the association between hydromorphone and/or ketamine administration and post-anesthetic hyperthermia in cats.
  • To compare the effects of different pre-anesthetic and anesthetic drug combinations on body temperature.

Main Methods:

  • A prospective clinical study involving 40 healthy adult cats undergoing routine surgeries.
  • Cats were randomly assigned to four groups receiving different combinations of hydromorphone or medetomidine with diazepam-ketamine or propofol.
  • Rectal temperatures were monitored for 5 hours post-anesthesia.

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Main Results:

  • At least one cat in each group exhibited a rectal temperature exceeding 39.2°C (102.5°F) within 5 hours post-anesthesia.
  • Higher percentages of temperature elevations above pre-anesthetic levels were observed in groups receiving hydromorphone (86% and 80%) compared to medetomidine groups (25% and 34%).
  • Maximum temperatures reached were higher in hydromorphone-treated groups, with one cat reaching 41.6°C (107.0°F).

Conclusions:

  • Hydromorphone administration is associated with an increased risk of post-anesthetic hyperthermia in cats.
  • While hydromorphone appears to be a significant factor, hyperthermia can occur with other anesthetic drug combinations.
  • Close monitoring for hyperthermia is essential in cats receiving hydromorphone post-surgery.