Hemodynamic effects of medetomidine-midazolam-butorphanol and medetomidine-midazolam-buprenorphine combinations and reversibility by atipamezole in dogs

Bruno Pypendop From the Department of Small Animal Obstetrics, Faculty of Veterinary Medicine, University of Liege, Bd de Colonster, 20, B44, Sart Tilman, B4000 Liege, Belgium.

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Didier Serteyn From the Department of Small Animal Obstetrics, Faculty of Veterinary Medicine, University of Liege, Bd de Colonster, 20, B44, Sart Tilman, B4000 Liege, Belgium.

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John Verstegen From the Department of Small Animal Obstetrics, Faculty of Veterinary Medicine, University of Liege, Bd de Colonster, 20, B44, Sart Tilman, B4000 Liege, Belgium.

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Abstract

Objective

To characterize the hemodynamic effects of medetomidine (1 mg/m2 of body surface area; dosage, 39 to 46 μg/kg of body weight, IM) and midazolam (1 mg/kg of body weight, IV) combined with butorphanol (0.1 mg/ kg, IV), buprenorphine (10 μg/kg, IV), or saline solution. Reversibility of these effects by atipamezole (2.5 mg/m2; dosage, 97.5 to 115 μg/kg, IM) was evaluated.

Design

2 treated groups and 1 control group, without repetition.

Animals

15 clinically normal dogs (3 groups of 5).

Procedure

Medetomidine was administered at time 0; midazolam and butorphanol, buprenorphine, or saline solution at time 20; and atipamezole at time 60. Heart rate, systemic and pulmonary arterial pressures, central venous pressure, body temperature, cardiac output, and arterial and mixed venous blood gas tensions and pH were measured. Cardiac index, stroke index, systemic and pulmonary vascular resistances, and left and right stroke work indexes were calculated.

Results

Body temperature, heart rate, cardiac index, and stroke index were significantly decreased below baseline values in some groups. Central venous pressure, pulmonary capillary wedge pressure, and systemic vascular resistance were significantly increased above baseline in all groups. Arterial and venous Po2 and pH decreased in all groups and Pco2 increased, but these changes were more pronounced when buprenorphine was administered. Arterial pressure decreased after atipamezole administration.

Conclusions

The combinations seemed to result in cardiorespiratory depressant effects of similar importance and most of these effects, which are related to medetomidine, were reversed by atipamezole. (Am J Vet Res 1996; 57:724–730)

Abstract

Objective

To characterize the hemodynamic effects of medetomidine (1 mg/m2 of body surface area; dosage, 39 to 46 μg/kg of body weight, IM) and midazolam (1 mg/kg of body weight, IV) combined with butorphanol (0.1 mg/ kg, IV), buprenorphine (10 μg/kg, IV), or saline solution. Reversibility of these effects by atipamezole (2.5 mg/m2; dosage, 97.5 to 115 μg/kg, IM) was evaluated.

Design

2 treated groups and 1 control group, without repetition.

Animals

15 clinically normal dogs (3 groups of 5).

Procedure

Medetomidine was administered at time 0; midazolam and butorphanol, buprenorphine, or saline solution at time 20; and atipamezole at time 60. Heart rate, systemic and pulmonary arterial pressures, central venous pressure, body temperature, cardiac output, and arterial and mixed venous blood gas tensions and pH were measured. Cardiac index, stroke index, systemic and pulmonary vascular resistances, and left and right stroke work indexes were calculated.

Results

Body temperature, heart rate, cardiac index, and stroke index were significantly decreased below baseline values in some groups. Central venous pressure, pulmonary capillary wedge pressure, and systemic vascular resistance were significantly increased above baseline in all groups. Arterial and venous Po2 and pH decreased in all groups and Pco2 increased, but these changes were more pronounced when buprenorphine was administered. Arterial pressure decreased after atipamezole administration.

Conclusions

The combinations seemed to result in cardiorespiratory depressant effects of similar importance and most of these effects, which are related to medetomidine, were reversed by atipamezole. (Am J Vet Res 1996; 57:724–730)

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