| Auditory-evoked potentials in general anesthesia monitoring: baseline study of availability in relation to hearing function in awake status. | |
MedLine Citation:
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PMID: 15954958 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: It has been confirmed that middle latency auditory-evoked potentials are good indicators of the hypnotic level in patients undergoing general anesthesia. The focal point for the evocation of auditory-evoked potentials is the presence of a serviceable hearing function. The aim of the study was to evaluate the limit of hearing loss above which the test could not be applied. METHODS: To determine the limit of applicability of the technique, 100 subjects were studied. Twenty of them were normally hearing and 80 were affected by sensorineural hearing loss of various degrees. Each subject was submitted to pure tone audiometry, to determine hearing threshold, and then, in awake status, to auditory-evoked potentials recording using acoustic stimuli of 85 dB HL. RESULTS: All the 20 normally hearing subjects showed a reliable auditory-evoked potentials. Among the 80 subjects affected by hearing loss, only five had no potentials. These five subjects presented a pure tone audiometry threshold greater than 85 dB HL. CONCLUSION: The study demonstrated that middle latency auditory-evoked potentials recorded using an A-Line (software version 1.4) AEP monitor (Danmeter, Odense, Denmark) can be carried out even in presence of hearing loss if the pure tone threshold is less than 85 dB HL. |
Authors:
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L De Siena; F Pallavicino; M Lacilla; A Canale; A Longobardo; G Pecorari; R Albera |
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Publication Detail:
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Type: Clinical Trial; Journal Article |
Journal Detail:
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Title: Acta anaesthesiologica Scandinavica Volume: 49 ISSN: 0001-5172 ISO Abbreviation: Acta Anaesthesiol Scand Publication Date: 2005 Jul |
Date Detail:
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Created Date: 2005-06-15 Completed Date: 2005-10-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0370270 Medline TA: Acta Anaesthesiol Scand Country: Denmark |
Other Details:
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Languages: eng Pagination: 774-7 Citation Subset: IM |
Affiliation:
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Department of Medico-Surgical Disciplines, Section of Anesthesia, University of Turin, Turin, Italy. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Adolescent Adult Aged Aged, 80 and over Anesthesia, General* Audiometry, Pure-Tone Auditory Threshold / drug effects Evoked Potentials, Auditory / drug effects* Female Hearing / physiology* Hearing Loss / physiopathology* Humans Male Middle Aged Wakefulness / physiology |
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