Bekesy Audiometry. It is self-recording audiometry based on sweep and fixed frequency testing, where various pure tone frequencies automatically move from low to high while the patient controls the intensity through a button. Two tracings, one with continuous and the other with the pulsed tone, are obtained. The tracings help to differentiate a cochlear from a retrocochlear and organic from a functional hearing loss. Bekesy audiometry is seldom performed these days.
Various types of tracings obtained are:
- Type I Continuous and pulsed tracings overlap. Seen in normal hearing or conductive hearing loss.
- Type II Continuous and pulsed tracings overlap up to 1000 Hz and then continuous tracing falls. Seen in cochlear loss.
- Type III Continuous tracing falls below pulsed tracing at 100–500 Hz even up to 40–50 dB. Seen in retrocochlear / neural lesion.
- Type IV Continuous tracing falls below pulsed lesion at frequencies up to 1000 Hz by more than 25 dB. Seen in retrocochlear/ neural lesion.
- Type V Continuous tracing is above pulsed one. Seen in nonorganic hearing loss.
——— End of the chapter ———
Learning resources.
- Scott-Brown, Textbook of Otorhinolaryngology Head and Neck Surgery.
- Glasscock-Shambaugh, Textbook of Surgery of the Ear.
- Logan Turner, Textbook of Diseases of The Nose, Throat and Ear Head And Neck Surgery.
- Rob and smith, Textbook of Operative surgery.
- 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.
- Anirban Biswas, Textbook of Clinical Audio-vestibulometry.
- W. Arnold, U. Ganzer, Textbook of Otorhinolaryngology, Head and Neck Surgery.
- Salah Mansour, Textbook of Comprehensive and Clinical Anatomy of the Middle Ear.
- Susan Standring, Gray’s Anatomy.
- Ganong’s Review of Medical Physiology.
Author:
Dr. Rahul Kumar Bagla
MS & Fellow Rhinoplasty & Facial Plastic Surgery.
Associate Professor
GIMS, Greater Noida, India
msrahulbagla@gmail.com
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