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A clinical study on the effect in horses during medetomidine-isoflurane anesthesia, of butorphanol constant rate infusion on isoflurane requirements, on cardiopulmonary function and on recovery characteristics


Bettschart-Wolfensberger, R; Dicht, S; Vullo, C; Frotzler, A; Kümmerle, J M; Ringer, S K (2011). A clinical study on the effect in horses during medetomidine-isoflurane anesthesia, of butorphanol constant rate infusion on isoflurane requirements, on cardiopulmonary function and on recovery characteristics. Veterinary Anaesthesia and Analgesia, 38:186-194.

Abstract

Objective  To test if the addition of butorphanol by constant rate infusion (CRI) to medetomidine–isoflurane anaesthesia reduced isoflurane requirements, and influenced cardiopulmonary function and/or recovery characteristics.

Study design  Prospective blinded randomised clinical trial.

Animals  61 horses undergoing elective surgery.

Methods  Horses were sedated with intravenous (IV) medetomidine (7 μg kg−1); anaesthesia was induced with IV ketamine (2.2 mg kg−1) and diazepam (0.02 mg kg−1) and maintained with isoflurane and a CRI of medetomidine (3.5 μg kg−1 hour−1). Group MB (n = 31) received butorphanol CRI (25 μg kg−1 IV bolus then 25 μg kg−1 hour−1); Group M (n = 30) an equal volume of saline. Artificial ventilation maintained end-tidal CO2 in the normal range. Horses received lactated Ringer’s solution 5 mL kg−1 hour−1, dobutamine <1.25 μg kg−1 minute−1 and colloids if required. Inspired and exhaled gases, heart rate and mean arterial blood pressure (MAP) were monitored continuously; pH and arterial blood gases were measured every 30 minutes. Recovery was timed and scored. Data were analyzed using two way repeated measures anova, independent t-tests or Mann–Whitney Rank Sum test (p < 0.05).

Results  There was no difference between groups with respect to anaesthesia duration, end-tidal isoflurane (MB: mean 1.06 ± SD 0.11, M: 1.05 ± 0.1%), MAP (MB: 88 ± 9, M: 87 ± 7 mmHg), heart rate (MB: 33 ± 6, M: 35 ± 8 beats minute−1), pH, PaO2 (MB: 19.2 ± 6.6, M: 18.2 ± 6.6 kPa) or PaCO2. Recovery times and quality did not differ between groups, but the time to extubation was significantly longer in group MB (26.9 ± 10.9 minutes) than in group M (20.4 ± 9.4 minutes).

Conclusion and clinical relevance  Butorphanol CRI at the dose used does not decrease isoflurane requirements in horses anaesthetised with medetomidine–isoflurane and has no influence on cardiopulmonary function or recovery.

Abstract

Objective  To test if the addition of butorphanol by constant rate infusion (CRI) to medetomidine–isoflurane anaesthesia reduced isoflurane requirements, and influenced cardiopulmonary function and/or recovery characteristics.

Study design  Prospective blinded randomised clinical trial.

Animals  61 horses undergoing elective surgery.

Methods  Horses were sedated with intravenous (IV) medetomidine (7 μg kg−1); anaesthesia was induced with IV ketamine (2.2 mg kg−1) and diazepam (0.02 mg kg−1) and maintained with isoflurane and a CRI of medetomidine (3.5 μg kg−1 hour−1). Group MB (n = 31) received butorphanol CRI (25 μg kg−1 IV bolus then 25 μg kg−1 hour−1); Group M (n = 30) an equal volume of saline. Artificial ventilation maintained end-tidal CO2 in the normal range. Horses received lactated Ringer’s solution 5 mL kg−1 hour−1, dobutamine <1.25 μg kg−1 minute−1 and colloids if required. Inspired and exhaled gases, heart rate and mean arterial blood pressure (MAP) were monitored continuously; pH and arterial blood gases were measured every 30 minutes. Recovery was timed and scored. Data were analyzed using two way repeated measures anova, independent t-tests or Mann–Whitney Rank Sum test (p < 0.05).

Results  There was no difference between groups with respect to anaesthesia duration, end-tidal isoflurane (MB: mean 1.06 ± SD 0.11, M: 1.05 ± 0.1%), MAP (MB: 88 ± 9, M: 87 ± 7 mmHg), heart rate (MB: 33 ± 6, M: 35 ± 8 beats minute−1), pH, PaO2 (MB: 19.2 ± 6.6, M: 18.2 ± 6.6 kPa) or PaCO2. Recovery times and quality did not differ between groups, but the time to extubation was significantly longer in group MB (26.9 ± 10.9 minutes) than in group M (20.4 ± 9.4 minutes).

Conclusion and clinical relevance  Butorphanol CRI at the dose used does not decrease isoflurane requirements in horses anaesthetised with medetomidine–isoflurane and has no influence on cardiopulmonary function or recovery.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Equine Department
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Language:English
Date:2011
Deposited On:18 Nov 2011 07:53
Last Modified:05 Apr 2016 15:06
Publisher:Wiley-Blackwell
ISSN:1467-2987
Publisher DOI:https://doi.org/10.1111/j.1467-2995.2011.00600.x
PubMed ID:21492383

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