Title | Validation of the acute electroencephalographs responses of calves to noxious stimulus with scoop dehorning |
Publication Type | Journal Article |
Year of Publication | 2007 |
Authors | Gibson, T.J. , Johnson C.B. , Stafford K.J. , Mitchinsont S.L. , and Mellor D.J. |
Journal | New Zealand Veterinary Journal |
Volume | 55 |
Issue | 4 |
Pagination | 152 - 157 |
Date Published | 2007 |
ISBN Number | 00480169 (ISSN) |
Keywords | Anesthesia, General , Anesthetics, Local , animal , animal disease , Animals , article , Bos , Bradycardia , calves , cattle , cauterization , Cautery , Dehorning , electrocardiography , Electroencephalogram , electroencephalography , female , Friesia , general anesthesia , horn , Horns , lidocaine , Lignocaine ring block , local anesthetic agent , methodology , Minimal anaesthesia model , Nociception , pain , pain assessment , Pain Measurement , physiology , standard , Tachycardia , validation study |
Abstract |
AIM: To validate use of the electroencephalogram (EEG) and a minimal anaesthesia model for assessment of noxious sensory input caused by scoop dehorning of calves. METHODS: Twenty Friesian heifers weighing 125-178 kg were maintained under light general anaesthesia using halothane and an established protocol (minimal anaesthesia model). They were then dehorned using a scoop dehorner either with (DH+LA) or without (DH) a lignocaine ring block, and changes in the EEG and electrocardiogram (ECG) recorded. Median frequency (F50), 95% spectral edge frequency (F95) and total power (Ptot) were derived from the EEG data. RESULTS: There were significant increases in the F50 (p<0.01) and F95 (p<0.01), and a decrease in Ptot (p<0.01) following dehorning in the DH group, but there were no changes in the DH+LA group. Transient bradycardia in the first 75 sec following dehorning was recorded in the DH group compared with both pre-treatment values in the same group and with the DH+LA group (p<0.001). Tachycardia was evident by 15 min after dehorning in the DH but not the DH+LA group. CONCLUSIONS: The results validate use of the EEG and a minimal anaesthesia model for assessment of noxious sensory inputs in cattle. |
URL | http://www.scopus.com/inward/record.url?eid=2-s2.0-34548019008&partnerID=40&md5=d95a4ca19408e7f694c2794450b7db9f |