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Tests For Hearing

Question
28 out of 41
 

A young man presents with an accident leading to loss of hearing in right ear. On otoscopic examination, the tympanic membrane was intact pure tone audiometry that shows an air-bone gap of 55 dB in the right with normal cochlear reserve. Which of the following will be the like ympanometry finding: (LQ)



A As type tympanogram

B Ad type tympanogram

C B type tympanogram

D C type tympanogram

Ans. B Ad type tympanogram

This is also a very interesting question:

The question says. Pure tone audiometry shows an air bone gap of 55 dB in the right ear with normal cochlear reserve.

The air-bone gap in pure tone audiometry is a measure of total conductive deafness.

Hence - it means there is a conductive deafness of 55 dB in the right ear.

Next the question says - Patient has intact tympanic membrane so we have to look for a cause ofthis 55 dB conductive deafness.

Average hearing loss seen in different lesions of conductive apparatus Ref. Dhinqra 5th/ed p 34

1. Complete obstruction of ear canal

2. Perfo!ation of tympanic membrane

3. Ossicular interruption with intact drum

4. Ossicular interruption with perforation

5. Closure of oval window

30 dB

10-40 dB

54dB

10-25 dB

60 dB

As is clear from above table - with tympanic membrane intact and a hearing loss of 55 dB is seen if ossicular chain is disrupteD.

Hence- it is a case of ossicular discontinuity.

Tympanogram seen in ossicular discontinuity is a high compliance tympanogram . Ad tympanogram.

Tests For Hearing Flashcard List

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