Intratesticular and incisional line infiltration with ropivacaine for castration in medetomidine-butorphanol-midazolam sedated dogs

Veterinary Anaesthesia and Analgesia
Yishai KushnirYael Shilo-Benjamini

Abstract

To evaluate whether intratesticular and incisional ropivacaine infiltration produces sufficient intra- and postoperative analgesia for castrating dogs under sedation. Randomized, blinded, controlled clinical study. Twenty-three healthy dogs weighing 5.8-35.6 kg admitted for castration. Dogs were sedated with medetomidine (0.01 mg kg-1), butorphanol (0.2 mg kg-1) and midazolam (0.2 mg kg-1) intramuscularly, and were randomly assigned to group R, 0.2-0.4 mL kg-1 of ropivacaine 0.5%, or group S, an equivalent volume of saline injected intratesticularly and along the incision line. If persistent motion was observed during surgery, sedation was considered to be insufficient and general anaesthesia was induced. Carprofen 2.2 mg kg-1 was administered postoperatively. Pain was evaluated in all dogs before sedation and postoperatively following atipamezole administration at 1, 2, 4, 8 and 24 hours using an interactive visual analogue scale (IVAS; 0-100), the Glasgow composite pain scale-short form (CMPS-SF; 0-24), and a mechanical algometer. Methadone 0.3 mg kg-1 was administered intravenously to dogs if IVAS >30 or CMPS-SF >4. There was no significant difference between groups for the number of dogs administered general anaesthesia. Th...Continue Reading

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