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Published (Version of Record)CC BY-NC V4.0, Open Access
Journal article
The effect of rectal temperature on perianesthetic serum concentrations of transdermally administered fentanyl in cats anesthetized with isoflurane
American journal of veterinary research, Vol.64(12), pp.1557-1561
2003
PMID: 14672436
Abstract
Objective
To determine whether moderate hypothermia during 4 hours of anesthesia with isoflurane substantially affects serum concentrations of transdermally administered fentanyl in the perianesthetic period in cats.
Animals
7 healthy mature cats.
Procedure
A fentanyl patch (25 µg/h) was applied to the shaved thorax 24 hours before induction of anesthesia. Anesthesia was induced at time 0. Each cat received 2 treatments in a random order. Treatments were isoflurane anesthesia with normothermia and isoflurane anesthesia with hypothermia. Cats were intubated, connected to a nonrebreathing circuit, and maintained at 1.3X minimum alveolar concentration for 4 hours. Cats in the hypothermia treatment groups were actively cooled to 35°C following the induction of anesthesia. Serum fentanyl analysis was performed at –24, –12, 0, 1, 2, 3, 4, 4.5, 5, 6, 7, 8, 9, 10, 12, and 24 hours.
Results
Mean ± SEM serum fentanyl concentration (SFC) for the hypothermia treatment group (0.598 ± 0.3048 ng/mL) was significantly lower than the baseline concentration (1.834 ± 0.6393 ng/mL) at 1 hour. This significant reduction persisted for the duration of anesthesia for the hypothermia treatment group. Serum fentanyl concentrations returned to baseline values within 1 hour of the end of anesthesia, regardless of body temperature.
Conclusions and Clinical Relevance
Hypothermia during inhalant anesthesia induced a significant reduction in SFC obtained with transdermal administration. The impact of this reduction in SFC on the contribution of transdermally administered fentanyl to any reduction in the need for inhalant anesthesia remains to be determined.
Details
- Title
- The effect of rectal temperature on perianesthetic serum concentrations of transdermally administered fentanyl in cats anesthetized with isoflurane
- Authors/Creators
- Glenn R PettiferGiselle Hosgood
- Publication Details
- American journal of veterinary research, Vol.64(12), pp.1557-1561
- Identifiers
- 991005592763707891
- Murdoch Affiliation
- School of Veterinary Medicine
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
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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