Document Detail

Auditory-evoked potentials in general anesthesia monitoring: baseline study of availability in relation to hearing function in awake status.
MedLine Citation:
PMID:  15954958     Owner:  NLM     Status:  MEDLINE    
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.
L De Siena; F Pallavicino; M Lacilla; A Canale; A Longobardo; G Pecorari; R Albera
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  49     ISSN:  0001-5172     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-06-15     Completed Date:  2005-10-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  774-7     Citation Subset:  IM    
Department of Medico-Surgical Disciplines, Section of Anesthesia, University of Turin, Turin, Italy.
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MeSH Terms
Acoustic Stimulation
Aged, 80 and over
Anesthesia, General*
Audiometry, Pure-Tone
Auditory Threshold / drug effects
Evoked Potentials, Auditory / drug effects*
Hearing / physiology*
Hearing Loss / physiopathology*
Middle Aged
Wakefulness / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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