Intraoperative reductions in serum fentanyl levels in dogs with induced moderate hypothermia and transdermal fentanyl patches (TDF) in place has been documented. The impact of such reductions has not been evaluated nor has the anesthetic sparing effect of the TDF. Reductions in serum levels may be the result of either a decreased uptake of fentanyl from the dermal depot, or a biophase shift. The objective of this investigation was to determine whether the minimum alveolar concentration (MAC) of isoflurane was altered in the presence of TDF in normothermic and hypothermic dogs.
Six mature, healthy, mixed breed dogs were anesthetized on four separate occasions, and received each of the 4 following treatments in random order: 1. Sham patch-normothermia (C-NORM), 2. Sham patch-hypothermia (C-HYPO), 3. Fentanyl patch-normothermia (F-NORM), 4. Fentanyl hypothermia (F-HYPO). The appropriate patch was applied twenty four hours prior to induction of anesthesia. Anesthesia was induced with isoflurane in oxygen; the dogs were intubated and mechanical ventilation was initiated. Target temperatures (34.5ºC- HYPO, or within 1ºC of baseline- NORM) were held constant for one hour prior to beginning the MAC determinations. Supramaximal stimulation was produced by an electrical stimulator which delivered a current to needle electrodes in the buccal mucosa of the lower jaw of the dog. The MAC (± SD) for C-NORM, C-HYPO, F-NORM and F-HYPO was 1.2 ± 0.17, 0.855 ± 0.183, 0.763 ± 0.097, and 0.830 ± 0.172 respectively. MAC for C-NORM was significantly higher than the other groups. There was no significant difference between C-HYPO, F-NORM, and F-HYPO.
Transdermal fentanyl reduces the isoflurane requirement in normothermic dogs. The presence of hypothermia appears to negate the effects of TDF.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-04112005-150748 |
| Date | 11 April 2005 |
| Creators | Wilson, Diane |
| Contributors | Giselle Hosgood, Claudio Natalini, Glenn Pettifer |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-04112005-150748/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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