Beta, alpha, theta and delta brain waves and their proportions during ketamine- and halothane-induced anaesthesia in horses
2001
Kruljc, P. (Ljubljana Univ. (Slovenia). Veterinary Fac.)
The study was carried out on ten cold-blood horses, divided into two groups and several time periods. The values of beta, alpha, theta and delta brain waves were monitored during general anaesthesia induced with ketamine and halothane after premedication with detomidine and butorphanol. A pEEG monitor with computer-modified EEG and measurements of individual brain wave proportions (beta, alpha, theta, delta) was used, as well as an anaesthesia monitor to control the vital functions of the horses. During anaesthesia pain sensation was examined as well. Ketamine-induced anaesthesia is characterised by intense and discordant activity of the two cerebral hemispheres. The proportion of brain waves resembled the values measured before the beginning of the experiment, although the horses were anaesthetised. During halothane-induced anaesthesia a decrease in high-frequency wave proportion and an increase in low-frequency wave proportion were established. Delta wave proportion did not change.
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