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Effects of anaesthetic induction on hypothermia in dogs undergoing ovariohysterectomy

J. L. Bornkamp, S. Robertson, N. M. Isaza, K. Harrison, B. A. DiGangi, L. Pablo

HYPOTHERMIA is a common complication of general anaesthesia in small animal practice. This study aimed to compare the influence of general anaesthesia with a benzodiazepine plus ketamine or propofol on intraoperative rectal and oesophageal temperatures and postoperative rectal temperature in dogs undergoing routine ovariohysterectomy.

Twenty-five adult female dogs which were brought to a veterinary teaching hospital for routine ovariohysterectomy were included in the study. Anaesthesia was induced with midazolam or diazepam plus ketamine (5 mg/kg in 11 dogs) or propofol (4 mg/kg in 12 dogs). Rectal temperature was measured at hospital admission, before premedication, immediately after anaesthetic induction and every five minutes after anaesthetic induction. Oesophageal temperature was measured every five minutes during anaesthesia, beginning 30 minutes after anaesthetic induction. After anaesthesia, dogs were covered with a warm-air blanket and rectal temperature was measured every 10 minutes until normothermia (37°C) was achieved.

No difference in baseline rectal temperature was identified between the treatment groups. Dogs in both treatment groups had lower rectal temperatures …

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