Bekesy Audiometry. Bekesy audiometry is a self-recording audiometric technique based on sweep and fixed frequency testing. In this method, various pure tone frequencies automatically shift from low to high, while the patient controls the intensity using a button. Two tracings are obtained: one with a continuous tone and the other with a pulsed tone. These tracings help differentiate between cochlear and retrocochlear hearing loss as well as between organic and functional hearing loss. However, Bekesy audiometry is seldom performed in contemporary practice.
The types of tracings obtained in Bekesy audiometry include:
- Type I: Continuous and pulsed tracings overlap, indicating normal hearing or conductive hearing loss.
- Type II: Continuous and pulsed tracings overlap up to 1000 Hz, after which the continuous tracing falls. This pattern is seen in cochlear loss.
- Type III: The continuous tracing falls below the pulsed tracing at 100–500 Hz, sometimes up to 40–50 dB. This pattern is indicative of a retrocochlear or neural lesion.
- Type IV: The continuous tracing falls below the pulsed tracing at frequencies up to 1000 Hz by more than 25 dB. This pattern is also seen in retrocochlear or neural lesions.
- Type V: The continuous tracing is above the pulsed tracing, which is characteristic of nonorganic hearing loss.
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Reference Textbooks.
- Scott-Brown, Textbook of Otorhinolaryngology-Head and Neck Surgery.
- Glasscock-Shambaugh, Textbook of Surgery of the Ear.
- P L Dhingra, Textbook of Diseases of Ear, Nose and Throat.
- Hazarika P, Textbook of Ear Nose Throat And Head Neck Surgery Clinical Practical.
- Mohan Bansal, Textbook of Diseases of Ear, Nose and Throat Head and Neck Surgery
- Hans Behrbohm, Textbook of Ear, Nose, and Throat Diseases With Head and Neck Surgery.
- Salah Mansour, Middle Ear Diseases – Advances in Diagnosis and Management.
- Logan Turner, Textbook of Diseases of The Nose, Throat and Ear Head And Neck Surgery.
- Rob and smith, Textbook of Operative surgery.
- Anirban Biswas, Textbook of Clinical Audio-vestibulometry.
- Arnold, U. Ganzer, Textbook of Otorhinolaryngology, Head and Neck Surgery.
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