• Vet Anaesth Analg · May 2007

    Randomized Controlled Trial

    Efficacy and cost-effectiveness of transdermal fentanyl patches for the relief of post-operative pain in dogs after anterior cruciate ligament and pelvic limb repair.

    • Christine M Egger, Leigh Glerum, Katherine Michelle Haag, and Barton W Rohrbach.
    • Department of Small Animal Medicine and Surgery, University of Georgia, Athens, GA, USA. cmegger@mail.ag.utk.edu
    • Vet Anaesth Analg. 2007 May 1; 34 (3): 200-8.

    ObjectivesTo determine whether transdermal fentanyl patches provided cost-effective post-operative analgesia in dogs with pelvic limb injuries.Study DesignProspective, randomized, blinded clinical trial.AnimalsTwenty-four dogs undergoing repair of ruptured cranial cruciate ligaments or pelvic limb fractures.MethodsDogs were randomly assigned to one of two groups: those receiving transdermal fentanyl patches (group F) and those receiving injectable morphine for control of post-operative pain (group M). Patients in both treatment groups were monitored for adequacy of analgesia and alterations in physiological variables. Plasma fentanyl concentrations were measured in Group F. Rescue morphine was given if a dog was deemed uncomfortable. The time of first rescue morphine, the total amount, and number of doses of morphine administered over 72 hours was quantified and compared for each group.ResultsThere was no significant treatment effect on any of the parameters, except for serum cortisol concentration, which was significantly lower overall in group F (p = 0.01). Pain scores peaked at 6 hours post-extubation and were higher than baseline from 2 to 20 hours post-extubation. Cortisol concentrations were the highest at time 0 (extubation) and were significantly higher than baseline until 2 hours post-extubation. Pain scores correlated with fentanyl plasma concentrations (p = 0.0001 and p = 0.01, respectively), but the correlation was low (r = 0.26 and r = 0.16, respectively). No correlation was found between serum cortisol concentrations and pain scores in either group. Fentanyl cost and total cost for pain management were considerably higher for group F.ConclusionsFentanyl patches did not provide better analgesia or a reduced requirement for rescue opioid compared with intramuscular morphine.Clinical RelevanceWhen considering overall costs to the client for comparable analgesic intervention, fentanyl patches increased rather than decreased cost during the first 24 hours post-operatively.

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