Abstract

This study was aimed at comparing the delta rhythm frequencies of electroencephalographic waves after inducing either with thiopentone or propofol intravenously in basset hound dogs. Fronto-polar montage was used to obtain the electroencephalographic waves. The depth of anaesthesia was also assessed clinically by recording the clinical parameters viz., heart rate, oxygen saturation, end-tidal carbon dioxide and blood pressure as well as by checking the reflexes. The animals induced with thiopentone had a lower frequency compared to the animals induced with propofol at all time periods. The frequency obtained immediately after inducing with thiopentone was 3.50 ± 2.40 Hz whereas the frequency obtained immediately after inducing with propofol was 3.94 ± 2.25 Hz. Whereas the frequency obtained at the 60^th minute time period after thiopentone induction was 2.13 ± 0.49 Hz and after propofol induction was 2.72 ± 1.56 Hz. The reflexes were absent during the observation periods

Keywords : Electroencephalography, Delta rhythm, Dog, Anesthesia, Thiopentone, Propofol