Journal article
The effect of inhalant anesthetic and body temperature on peri-anesthetic serum concentrations of transdermally administered fentanyl in dogs
Veterinary anaesthesia and analgesia, Vol.31(2), pp.109-120
2004
PMID: 15053749
Abstract
Objectives
To determine whether moderate hypothermia during anesthesia significantly affects the serum concentration of transdermally delivered fentanyl and whether halothane or isoflurane affect these concentrations.
Study Design
Randomized cross-over experimental trial.
Animals
Six mature, healthy Beagles (three males, three females) weighing 10.6 ± 0.43 kg.
Methods
A 50-µg hour−1 fentanyl patch was applied 36 hours prior to anesthesia. Anesthesia was induced at time 0 (t = 0). Each dog received four treatments: isoflurane + normothermia (ISO-NORM), isoflurane + hypothermia (ISO-HYPO), halothane + normothermia (HAL-NORM), and halothane + hypothermia (HAL-HYPO). Dogs were intubated and maintained at 1.5 times MAC. Animals in the hypothermia treatments were cooled to 35 °C during anesthesia. Serum fentanyl analysis was performed at −36, −24, −12, 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9, 10, 18, and 26 hours. Direct arterial blood pressures and arterial blood gases were monitored.
Results
The mean body temperatures (±SEM) during the anesthetic period for the four treatments were: ISO-NORM = 37.7 ± 0.07 °C, ISO-HYPO = 35.8 ± 0.1 °C, HAL-NORM = 37.7 ± 0.06 °C, and HAL-HYPO = 35.8 ± 0.13 °C. The mean (±SEM) serum fentanyl concentrations (SFC) for both hypothermia treatments were significantly lower than baseline concentrations at t = 1 hour and persisted for the duration of anesthesia for the ISO-HYPO treatment but only from t = 1 to 2 hours for the HAL-HYPO treatment. Serum fentanyl concentrations returned to baseline within one hour of the end of anesthesia, regardless of body temperature. There were no significant differences between treatments for systolic or diastolic blood pressure but mean blood pressures were higher during normothermia versus hypothermia during the last hour of anesthesia.
Conclusions and clinical relevance
Hypothermia during inhalation anesthesia produced a significant reduction in SFC using transdermal administration and was more protracted with isoflurane than halothane anesthesia. While significant reductions in SFC occurred, the SFC were still within the range believed to confer analgesia.
Details
- Title
- The effect of inhalant anesthetic and body temperature on peri-anesthetic serum concentrations of transdermally administered fentanyl in dogs
- Authors/Creators
- Glenn R Pettifer - Louisiana State UniversityGiselle Hosgood - Louisiana State University
- Publication Details
- Veterinary anaesthesia and analgesia, Vol.31(2), pp.109-120
- Publisher
- Blackwell Science Ltd
- Identifiers
- 991005592762407891
- Copyright
- © 2004 Association of Veterinary Anaesthetists and American College of Veterinary Anesthesia and Analgesia
- Murdoch Affiliation
- School of Veterinary Medicine
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 1 Clinical & Life Sciences
- 1.43 Anesthesiology
- 1.43.1642 Veterinary Anesthesia
- Web Of Science research areas
- Veterinary Sciences
- ESI research areas
- Plant & Animal Science