[The effect of volatile anesthetics on EEG, auditory evoked potentials and somatosensory evoked potentials in dogs].
We compared the changes in EEG and evoked potentials among dogs anesthetized with halothane (H), isoflurane (I) or enflurane (E). The mean frequency of EEG with H was higher than that with I and E at 1 and 2 MAC. The amplitude of the 5th wave of auditory brain stem response with H was larger than that with I and E at 2 MAC. In terms of the Pa wave of auditory middle latency response, the amplitude with H was larger than that with E at 1 MAC, and the incidence of the wave with H was higher than that with I and E at 2 MAC. The amplitudes of N2 and N3 waves of somatosensory evoked potentials with H and I tended to decrease with increasing MAC, whereas those with E increased temporarily at 1 MAC. The inhibitory effects on EEG and evoked potentials were different among three volatile anesthetics.
Ono
K
K
Department of Anesthesia, Nishitaga National Hospital, Sendai.
Yasuda
A
A
Matsukawa
S
S
Akama
M
M
Hashimoto
Y
Y
D018685:Anesthetics, Inhalation / Q000494:pharmacology*; D000818:Animals; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D004569:Electroencephalography / Q000187:drug effects*; D004737:Enflurane / Q000494:pharmacology; D005072:Evoked Potentials, Auditory / Q000187:drug effects*; D005073:Evoked Potentials, Somatosensory / Q000187:drug effects*; D006221:Halothane / Q000494:pharmacology; D007530:Isoflurane / Q000494:pharmacology
D018685:Anesthetics, Inhalation; D004737:Enflurane; D007530:Isoflurane; D006221:Halothane