Tag: Cochlear versus Retrocochlear hearing loss

Cochlear versus Retrocochlear hearing loss

Cochlear versus Retrocochlear hearing loss


DIFFERENCE BETWEEN COCHLEAR AND RETROCOCHLEAR DEAFNESS

Test Normal Cochlear lesion Retrocochlear lesion
Pure Tone Audiogram  Normal  SNHL   SNHL
Speech Discrimination 90-100%  < 90%  Very poor
Roll over phenomenon  Absent   Absent  Present
Recruitment Absent Present Absent
SISI Score 0-15% >70% 0-20%
Threshold tone decay 0-15DB <25DB >25DB
Stapedial Reflex Present Present Absent
Stapedial reflex Decay Normal Normal Abnormal
BERA Normal interval
between wave I and V
Normal interval
between wave I and V 
Wave V delayed or
absent
Exam Question
 
  • Recruitment phenomenon is seen in Presbyaccusis,Meniere’s Disease(Cochlear lesion)
  • To distinguish between cochlear and post cochlear dam­age, test done is Brainsterm evoked response audiometry.
  • Stapedial Reflex Decay is absent in 8th nerve lesion.(suggestive of Retrocochlear lesion)
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Cochlear versus Retrocochlear hearing loss

Cochlear versus Retrocochlear hearing loss

Q. 1

Recruitment phenomenon is seen in:

 A

Otosclerosis

 B

Presbyaccusis

 C

Acoustic nerve schwannoma

 D

Otitis media with effusion

Q. 1

Recruitment phenomenon is seen in:

 A

Otosclerosis

 B

Presbyaccusis

 C

Acoustic nerve schwannoma

 D

Otitis media with effusion

Ans. B

Explanation:

Q. 2

To distinguish between cochlear and post cochlear dam­age, test done is:

 A

Brainsterm evoked response audiometry

 B

Impedence audiometry

 C

Pure tone audiometry

 D

Auditory cochlear potential

Q. 2

To distinguish between cochlear and post cochlear dam­age, test done is:

 A

Brainsterm evoked response audiometry

 B

Impedence audiometry

 C

Pure tone audiometry

 D

Auditory cochlear potential

Ans. A

Explanation:

 

BERA is very useful in distinguishing between cochlear pathology and retrocochlear pathology for SNHL

Impedence audiometry and PTA tests the middle ear pathology.


Q. 3

Acoustic/Stapedial reflex decay test is positive inlesion of:          

 A

Cerebellum

 B

Midbrain

 C

Eighth nerve

 D

Auditory cortex

Q. 3

Acoustic/Stapedial reflex decay test is positive inlesion of:          

 A

Cerebellum

 B

Midbrain

 C

Eighth nerve

 D

Auditory cortex

Ans. C

Explanation:

Q. 4

Recruitment test is positive in:             

 A

Retrocochlear lesions

 B

Otosclerosis

 C

Meniere’s disease

 D

None of the above

Q. 4

Recruitment test is positive in:             

 A

Retrocochlear lesions

 B

Otosclerosis

 C

Meniere’s disease

 D

None of the above

Ans. C

Explanation:


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