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Tests For Hearing

Question
22 out of 41
 

Impedance audiometry is done using frequency probe of: (DNB June2011)



A 220 Hz
B 550 Hz

C 440 Hz
D 1000 Hz

Ans. A 220 Hz

Impedance Audiometry

1. It is an objective test for hearinq?

2. It is very useful in children for assessing the hearing loss. Q

3. It consists of:

Tympanometry

Acoustic reflex measurement

Principle: It is based on the amount of sound reflected back from the tympanic membrane when an 85dB sound pressure level (SPL) low frequency (220 Hz)Q probe tone is introduced into the sealed ear canal, and pressure in the canal is varieD. By changing the pressures in the sealed auditory canal and then measuring the reflected sound energy, it is possible to find the compliance or stiffness of the tympano-ossicular system and thus find the healthy or diseased status of the middle ear

Discussed in detail earlier

Impendance audiometry is used for diagnosing middle ear pathology .

Note

Various types oftympanograms are discussed in next question.

For infants and neonates, tympanograms obtained using a 220 Hz probe may erroneously appear normal.

:. a higher frequency probe tone (660 or 1000 Hz) must be used - (Current Otolaryngology 2nd/ed p 601)

Tests For Hearing Flashcard List

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