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Bispectral index reveals death-feigning behavior in a red kite


Martin Jurado, Olga; Simova-Curd, Stefka; Bettschart-Wolfensberger, Regula; Hatt, Jean-Michel (2011). Bispectral index reveals death-feigning behavior in a red kite. Journal of Avian Medicine and Surgery, 25(2):132-135.

Abstract

Red kites (Milvus milvus) are raptors known to feign death in the presence of humans. An adult wild red kite (Milvus milvus), ASA II, underwent coelioscopy. Butorphanol was administered before induction of anesthesia which was maintained with 1.5% isoflurane in oxygen. Intraoperatively, heart rate and respiratory rate ranged from 240 to 260 bpm and from 16 to 28 brpm, respectively. Pupil and corneal reflexes were always present. Body temperature was maintained at 40.4°C. Suppression ratio was 0 during the whole anesthesia. Bispectral index was 44 immediately after intubation, ranged from 44 to 57 during maintenance of anesthesia and at the moment of extubation it was 59. The index rose up to 85 within a minute while the kite remained immobile under the suspicion of feigning death in sternal recumbence. The bird was perched keeping immediately the upright position. This fact confirmed the correspondence of the BIS value (85) with a fully conscious patient. Whereas behavioral or cardio-respiratory variables remained unchanged, the degree of hypnosis was uncovered by BIS, which anticipated a possible sudden awakening episode of the kite.

Abstract

Red kites (Milvus milvus) are raptors known to feign death in the presence of humans. An adult wild red kite (Milvus milvus), ASA II, underwent coelioscopy. Butorphanol was administered before induction of anesthesia which was maintained with 1.5% isoflurane in oxygen. Intraoperatively, heart rate and respiratory rate ranged from 240 to 260 bpm and from 16 to 28 brpm, respectively. Pupil and corneal reflexes were always present. Body temperature was maintained at 40.4°C. Suppression ratio was 0 during the whole anesthesia. Bispectral index was 44 immediately after intubation, ranged from 44 to 57 during maintenance of anesthesia and at the moment of extubation it was 59. The index rose up to 85 within a minute while the kite remained immobile under the suspicion of feigning death in sternal recumbence. The bird was perched keeping immediately the upright position. This fact confirmed the correspondence of the BIS value (85) with a fully conscious patient. Whereas behavioral or cardio-respiratory variables remained unchanged, the degree of hypnosis was uncovered by BIS, which anticipated a possible sudden awakening episode of the kite.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Equine Department
05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Uncontrolled Keywords:death-feigning behavior, bispectral index, isoflurane, avian, red kite, Milvus milvus
Language:English
Date:2011
Deposited On:01 Dec 2011 12:57
Last Modified:17 Feb 2018 14:03
Publisher:Association of Avian Veterinarians
ISSN:1082-6742
OA Status:Green
Publisher DOI:https://doi.org/10.1647/2010-001.1
PubMed ID:21877451

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