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Phase audiometry--a rapid method for detecting cerebello-pontine angle tumours?
U Almqvist1, B Almqvist, K E Jönsson
1Department of Oto-Rhino-Laryngology, University Hospital of Lund, Sweden.
Scandinavian Audiology
|January 1, 1989
Summary
This study on hearing loss suggests that an interaural time difference (ITD) detection limit exceeding 120 microseconds may indicate a retrocochlear lesion, aiding in auditory diagnosis.
Area of Science:
- Audiology
- Neuroscience
- Otolaryngology
Background:
- Hearing loss diagnosis requires differentiating cochlear from retrocochlear pathologies.
- Interaural time differences (ITDs) are crucial for sound localization and can be affected by retrocochlear impairments.
Purpose of the Study:
- To establish a borderline value for detecting interaural time differences (ITDs) in various hearing loss groups.
- To assess the utility of ITD detection in identifying retrocochlear lesions.
Main Methods:
- Manual phase audiometry was used to test interaural time difference detection.
- Four subject groups were evaluated: normal hearing, cochlear hearing loss, CPA tumors, and conductive impairment.
Main Results:
- An upper borderline value of 120 microseconds for ITD detection is proposed.
- Subjects unable to detect ITDs below 120 microseconds were likely to have retrocochlear lesions.
Conclusions:
- ITD detection, particularly the 120-microsecond threshold, shows potential for identifying retrocochlear pathologies.
- This finding can assist in the differential diagnosis of hearing impairments.