doi: 10.1046/j.1365-2044.2002.02693.x.
The effects of nitrous oxide on the auditory evoked potential index during sevoflurane anaesthesia
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- PMID: 12133083
- DOI: 10.1046/j.1365-2044.2002.02693.x
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The effects of nitrous oxide on the auditory evoked potential index during sevoflurane anaesthesia
Anaesthesia.
2002 Aug.
Free article
Abstract
We have studied the effects of nitrous oxide on the auditory evoked response index (AAI-index) derived from the A-line monitoring device during sevoflurane anaesthesia in 21 patients undergoing minor ambulatory surgery. During sevoflurane anaesthesia with an AAI-index < 30, the addition or withdrawal of nitrous oxide in a concentration of 66% end tidal did not show any linear dose dependent change in AAI-index . However, comparing nitrous oxide > 40% to nitrous oxide < 10% end tidal concentration the AAI-index did decrease, p < 0.05. The AAI-index is either non-linear at deeper anaesthetic levels or is insensitive to the anaesthetic effects of nitrous oxide in terms of MAC-multiples.
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