Auditory-evoked potentials in general anesthesia monitoring: baseline study of availability in relation to hearing function in awake status
| Autor: | Michelangelo Lacilla, Andrea Canale, Roberto Albera, F. Pallavicino, Giancarlo Pecorari, A. Longobardo, L. De Siena |
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| Rok vydání: | 2005 |
| Předmět: |
Adult
Male medicine.medical_specialty Adolescent medicine.drug_class Hearing loss Anesthesia General Audiology Hypnotic Hearing otorhinolaryngologic diseases Humans Medicine Wakefulness Evoked potential Hearing Loss Aged Aged 80 and over Baseline study Absolute threshold of hearing medicine.diagnostic_test business.industry Auditory Threshold General Medicine Middle Aged medicine.disease Anesthesiology and Pain Medicine Acoustic Stimulation Evoked Potentials Auditory Audiometry Pure-Tone Female Sensorineural hearing loss Pure tone audiometry medicine.symptom business Hearing function |
| Zdroj: | Acta Anaesthesiologica Scandinavica. 49:774-777 |
| ISSN: | 1399-6576 0001-5172 |
| DOI: | 10.1111/j.1399-6576.2005.00719.x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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