Bispectral Index Analysis of Opioid Immobilization of Rocky Mountain Elk

Terry J. Kreeger; Khursheed Mama; Matthew Huizenga; Cole Hansen; Cynthia Tate

doi:10.2193/2009-286

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Terry J. Kreeger,¹ Khursheed Mama,² Matthew Huizenga,¹ Cole Hansen,¹ Cynthia Tate¹

¹aWyoming Game and Fish Department, 2362 Highway 34, Wheatland, WY 82201, USA
²bCollege of Veterinary Medicine, Department of Clinical Sciences, Colorado State University, Fort Co

Abstract

We immobilized elk with either isoflurane to produce general anesthesia (control), 0.01 mg/kg carfentanil plus 0.1 mg/kg xylazine, or 0.25 mg/kg butorphanol plus 0.4 mg/kg azaperone plus 0.15 mg/kg medetomidine (BAM) and measured the bispectral index (BIS). The carfentanil-xylazine BIS (70.4 ± 1.4) and the BAM BIS (60.2 ± 1.5) were higher than the control BIS (47.2 ± 4.1; P ≤ 0.001). These data indicate that opioids produce neuroleptanalgesia and not general anesthesia or sedation, which explains observed elk responses to these drugs.

Citation Download Citation

Terry J. Kreeger, Khursheed Mama, Matthew Huizenga, Cole Hansen, and Cynthia Tate "Bispectral Index Analysis of Opioid Immobilization of Rocky Mountain Elk," Journal of Wildlife Management 74(4), 902-905, (1 May 2010). https://doi.org/10.2193/2009-286

Published: 1 May 2010