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Fentanyl or midazolam for co-induction of anaesthesia with propofol in dogs.

Author(s): Covey-Crump GL, Murison PJ

Affiliation(s): University of Bristol Veterinary School, Bristol, UK. gwen.covey-crump@bristol.ac.uk

Publication date & source: 2008-11, Vet Anaesth Analg., 35(6):463-72. Epub 2008 Jun 19.

Publication type: Randomized Controlled Trial

OBJECTIVE: Propofol may cause adverse effects (e.g. apnoea, hypotension) at induction of anaesthesia. Co-induction of anaesthesia may reduce propofol requirements. The effect of fentanyl or midazolam on propofol dose requirements and cardiorespiratory parameters was studied. STUDY DESIGN: Randomized, controlled, blinded clinical study. ANIMALS: Sixty-six client owned dogs (35 male, 31 female, ASA I-II, age 6-120 months, body mass 4.7-48.0 kg) were selected. METHODS: Pre-medication with acepromazine (0.025 mg kg(-1)) and morphine (0.25 mg kg(-1)) was administered by intramuscular injection. After 30 minutes group fentanyl-propofol (FP) received fentanyl (2 microg kg(-1)), group midazolam-propofol (MP) midazolam (0.2 mg kg(-1)) injected over 30 seconds via a cephalic catheter and in a third group, control-propofol (CP), the IV catheter was flushed with an equivalent volume of heparinized saline. Anaesthesia was induced 2 minutes later, with propofol (4 mg kg(-1)minute(-1)) administered to effect. After endotracheal intubation anaesthesia was maintained with a standardized anaesthetic protocol. Pulse rate, respiratory rate (RR) and mean arterial pressure (MAP) were recorded before the co-induction agent, before induction, and 0, 2 and 5 minutes after intubation. Apnoea >or=30 seconds was recorded and treated. Sedation after pre-medication, activity after the co-induction agent, quality of anaesthetic induction and endotracheal intubation were scored. RESULTS: Propofol dose requirement was significantly reduced in FP [2.90 mg kg(-1)(0.57)] compared to CP [3.51 mg kg(-1) (0.74)] and MP [3.58 mg kg(-1)(0.49)]. Mean pulse rate was higher in MP than in CP or FP (p = 0.003). No statistically significant difference was found between groups in mean RR, MAP or incidence of apnoea. Activity score was significantly higher (i.e. more excited) (p = 0.0001), and quality of induction score was significantly poorer (p = 0.0001) in MP compared to CP or FP. Intubation score was similar in all groups. CONCLUSIONS AND CLINICAL RELEVANCE: Fentanyl decreased propofol requirement but did not significantly alter cardiovascular parameters. Midazolam did not reduce propofol requirements and caused excitement in some animals.

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