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The influence of anesthesia with and without medetomidine on cardiac structure and function in sanctuary captive chimpanzees (pan troglodytes)

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Author
Drane, Aimee L.
Calvi, Thalita
Feltrer, Yedra
Curry, Bryony
Tremblay, Joshua
Milnes, Ellie
Stöhr, Eric J.
Howastan, Glyn
Oxborough, David
Stembridge, Mike
Shave, Rob
Date
2021-09-28
Acceptance date
2021-04-07
Type
Article
Publisher
American Association of Zoo Vetinarians
ISSN
1042-7260
1937-2825 (electronic)
Embargoed until
2100-01-01
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Abstract
Dependent on timing of assessment, anesthetic agents and specifically medetomidinenegatively impact cardiac function in great apes. The aim of this study was todetermine the influence of tiletamine-zolazepam with and without medetomidine oncardiac structure and function in healthy chimpanzees ( Pan troglodytes ) during aperiod of relative blood pressure stability. Twenty-four chimpanzees living in an Africanwildlife sanctuary undergoing routine health assessments were stratified by age, sexand body mass and randomized to be anesthetized using either tiletamine-zolazepam(6 mg/kg; TZ; n=13; seven males and six females) or a combination of tiletamine-zolazepam (2 mg/kg) and medetomidine (0.02 mg/kg; TZM; n= 11; five males and sixfemales). During the health checks, regular heart rate and blood pressure readingswere taken and a standardized echocardiogram was performed 20-30 minutes post-induction. Data were compared between the two anesthetic groups using independentsamples T or Mann Whitney U tests. Whileheart rate (Mean ± S.D; TZ: 76 ± 10 bpm;TZM: 65 ± 14 bpm, P = 0.027), cardiac output (TZ: 3.0 ± 0.7 L/min; TZM: 2.4 ±0.7 L/min, P = 0.032) and mitral A wave velocities (TZ: 0.51 ± 0.16 cm/s; TZM:0.36 ± 0.10 cm/s, P = 0.013) were lower in the TZM group, there were no statisticallysignificant differences in cardiac structure or the remaining functional variablesbetween groups. Furthermore, there were no statistical differences in systolic (TZ114.6 ± 14.9 mmHg; TZM: 123.0 ± 28.1 mmHg; P = 0.289) or diastolic bloodpressure (TZ: 81.8 ± 22.3 mmHg, TZM: 83.8 ± 20.1 mmHg; P = 0.827) between thegroups during the echocardiogram. This study has shown that during a period ofrelative blood pressure stability there are few differences in measures of cardiacstructure and function between protocols using tiletamine-zolazepam with or withoutmedetomidine in healthy chimpanzees.
Journal/conference proceeding
Journal of Zoo and Wildlife Medicine;
Citation
Drane, A.L., Calvi, T., Feltrer, Y., Curry, B.A., Tremblay, J.C., Milnes, E.L., Stöhr, E.J., Howatson, G., Oxborough, D., Stembridge, M. and Shave, R. (2021) 'The influence of anesthesia with and without medetomidine on cardiac structure and function in sanctuary captive chimpanzees (pan troglodytes)', Journal of Zoo and Wildlife Medicine, 52(3), pp.986-996. https://doi.org/10.1638/2020-0024
URI
http://hdl.handle.net/10369/11360
DOI
https://doi.org/10.1638/2020-0024
Description
Article published in Journal of Zoo and Wildlife Medicine available at https://doi.org/10.1638/2020-0024
Closed Deposit
Rights
http://www.rioxx.net/licenses/all-rights-reserved
Sponsorship
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
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