Efficacy of the A-line AEP monitor as a tool for predicting successful insertion of a laryngeal mask during sevoflurane anesthesia

Acta Anaesthesiologica Scandinavica
S AlpigerH Ording

Abstract

The use of clinical signs for assessing depth of anesthesia is unreliable during periods with little noxious stimulation. A patient may appear adequately anesthetized at one moment at a given level of stimulation, but may later, when facing other more intense stimuli, show signs of insufficient anesthesia. In order to prevent under- or overdosing of anesthetics, an anesthesia depth monitor that is able to predict responses to noxious stimulation would therefore be useful. Auditory evoked potentials (AEP) is one of several physiological parameters under investigation. The method has been improved by rapid extraction and conversion of the AEP curve into an index (A-Line ARX Index = AAI). We aimed to determine the clinically required depth of anesthesia, measured by the A-line AEP Monitor, for at least 90% probability of acceptable insertion conditions for a laryngeal mask airway (LMA). We studied 112 patients anesthetized by mask with increasing concentration of sevoflurane in oxygen. The monitor was programmed to give an alarm at AAI between 15 and 40 according to randomization. When the alarm sounded, the end-expiratory sevoflurane concentration was recorded and the LMA inserted. Insertion conditions were assessed by an observe...Continue Reading

References

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Citations

Jan 23, 2008·Der Anaesthesist·G N SchmidtP Bischoff
Apr 2, 2011·Acta Anaesthesiologica Taiwanica : Official Journal of the Taiwan Society of Anesthesiologists·Ying-Tzu ChenSiu-Wah Chau
Dec 23, 2006·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·P MartoranoP Pelaia
Aug 19, 2014·Acta Anaesthesiologica Scandinavica·J Raeder
Sep 22, 2006·Molecular Endocrinology·Aline Mamin, Jacques Philippe

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