Validation of the acute electroencephalographs responses of calves to noxious stimulus with scoop dehorning

TitleValidation of the acute electroencephalographs responses of calves to noxious stimulus with scoop dehorning
Publication TypeJournal Article
Year of Publication2007
AuthorsGibson, T.J., Johnson C.B., Stafford K.J., Mitchinsont S.L., and Mellor D.J.
JournalNew Zealand Veterinary Journal
Volume55
Issue4
Pagination152 - 157
Date Published2007
ISBN Number00480169 (ISSN)
KeywordsAnesthesia, 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.

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