Journal article
Comparison of cardiopulmonary effects of etorphine and thiafentanil administered as sole agents for immobilization of impala (Aepyceros melampus)
Veterinary Anaesthesia and Analgesia, Vol.48(1), pp.53-64
2021
Abstract
Objective
To compare the cardiopulmonary effects of the opioids etorphine and thiafentanil for immobilization of impala.
Study design
Two-way crossover, randomized study.
Animals
A group of eight adult female impala.
Methods
Impala were given two treatments: 0.09 mg kg–1 etorphine or 0.09 mg kg–1 thiafentanil via remote dart injection. Time to recumbency, quality of immobilization and recovery were assessed. Respiratory rate, heart rate (HR), mean arterial blood pressure (MAP) and arterial blood gases were measured. A linear mixed model was used to analyse the effects of treatments, treatments over time and interactions of treatment and time (p < 0.05).
Results
Time to recumbency was significantly faster with thiafentanil (2.0 ± 0.8 minutes) than with etorphine (3.9 ± 1.6 minutes; p = 0.007). Both treatments produced bradypnoea, which was more severe at 5 minutes with thiafentanil (7 ± 4 breaths minute–1) than with etorphine (13 ± 12 breaths minute–1; p = 0.004). HR increased with both treatments but significantly decreased over time when etorphine (132 ± 17 to 82 ± 11 beats minute–1) was compared with thiafentanil (113 ± 22 to 107 ± 36 beats minute–1; p < 0.001). Both treatments caused hypertension which was more profound with thiafentanil (mean overall MAP = 140 ± 14 mmHg; p < 0.001). Hypoxaemia occurred with both treatments but was greater with thiafentanil [PaO2 37 ± 13 mmHg (4.9 kPa)] than with etorphine [45 ± 16 mmHg (6.0 kPa)] 5 minutes after recumbency (p < 0.001). After 30 minutes, PaO2 increased to 59 ± 10 mmHg (7.9 kPa) with both treatments (p < 0.001).
Conclusions and clinical relevance
The shorter time to recumbency with thiafentanil may allow easier and faster retrieval in the field. However, thiafentanil caused greater hypertension, and ventilatory effects during the first 10 minutes, after administration.
Details
- Title
- Comparison of cardiopulmonary effects of etorphine and thiafentanil administered as sole agents for immobilization of impala (Aepyceros melampus)
- Authors/Creators
- S. Pfitzer (Author/Creator) - Murdoch UniversityL. Meyer (Author/Creator)L. Laubscher (Author/Creator) - Stellenbosch UniversityK. Warren (Author/Creator) - Murdoch UniversityR. Vaughan-Higgins (Author/Creator) - Murdoch UniversityJ.P. Raath (Author/Creator) - Wildlife Pharmaceuticals South Africa (Pty) Ltd., White River, South Africa.M. Laurence (Author/Creator) - Murdoch University
- Publication Details
- Veterinary Anaesthesia and Analgesia, Vol.48(1), pp.53-64
- Publisher
- Elsevier Ltd.
- Identifiers
- 991005542288407891
- Copyright
- © 2020 Association of Veterinary Anaesthetists and American College of Veterinary Anesthesia and Analgesia
- Murdoch Affiliation
- School of Veterinary Medicine
- Language
- English
- Resource Type
- Journal article
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