[Alterations of the brain stem and mid-latency evoked potentials under oxygen-nitrous oxide-sevoflurane anesthesia].
We evaluated the alterations of the brain stem and mid-latency evoked potentials (BAEP and MLAEP) in 10-patients who were scheduled for elective abdominal surgery under oxygen-nitrous oxide-sevoflurane anesthesia. With oxygen 2 l.min-1 and nitrous oxide 4 l.min-1, we measured the latency of BAEP and MLAEP at the end-expired sevoflurane concentrations of 0%, 0.3%, 0.6%, 1.0%, 1.5% and 2.0%, respectively. The latency of BAEP was slightly prolonged with oxygen-nitrous oxide-sevoflurane anesthesia. The latency of MLAEP was markedly prolonged with the increase of sevoflurane concentration, and all waves but Na wave disappeared at the 2.0% sevoflurane concentration.
Kadoi
Y
Y
Department of Anesthesiology, Saitama Prefectural Ohara-Cardiovascular Center.
Fujita
N
N
Kameda
M
M
Yokota
T
T
Obata
H
H
Saito
S
S
D000005:Abdomen / Q000601:surgery; D000368:Aged; D000769:Anesthesia, Inhalation; D018685:Anesthetics, Inhalation; D004305:Dose-Response Relationship, Drug; D004987:Ethers; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006801:Humans; D008297:Male; D008738:Methyl Ethers; D008875:Middle Aged; D009609:Nitrous Oxide; D010100:Oxygen; D011930:Reaction Time / Q000502:physiology; D000077149:Sevoflurane
D018685:Anesthetics, Inhalation; D004987:Ethers; D008738:Methyl Ethers; D000077149:Sevoflurane; D009609:Nitrous Oxide; D010100:Oxygen