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Tests For Hearing

Question
7 out of 41
 

Rinne's test is negative if minimum deafness is:



A 15-20 dB
B 25-30 dB

C 35-40 dB
D 15-50 dB

Ans. A 15 - 20 dB Ref. Dhingra Stii/ed p26, 6th/ed p 22

As discussed in the text in Rinnies test-air conduction of the ear is compared with its bone conduction.

Principle and Result

In normal individuals → AC > BC . Rinne test is positive

In case of conductive deafness ~ air conduction is decreaseD. Hence BC> AC . Rinne test negative

In U/L SNHL → air conduction is normal whereas BC is further decreaseD. Hence AC > BC. Rinne test positive

But in case of severe U/L SNHL - patients do not perceive any sound of tuning fork by air conduction but respond to bone conduction testing which is in reality due to transcranial transmission of sound from the normal ear.

Hence there is false negative Rinne test (BC > AC).

Result

Inference

Seen in

Positive

Negative

False negative

Air conduction> Bone conduction

Bone conduction> Air conduction

Normal individuals

SNHL

Conductive deafness

Severe SNHL

Note

A negative Rinne test indicates a minimum air bone gap of 15-20 dB (Ans 7)

Now lets see Os 5 and 6

0.5 says Rinne's test is negative in -

We know negative Rinne test is seen in case of conductive deafness. Amongst the options given, only tympanosclerosis is a cause for conductive deafness.

Again in 0.6 - only CSOM causes conductive deafness.

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