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)
Don’t Forget to Solve all the previous Year Question asked on Cochlear versus Retrocochlear hearing loss

Leave a Reply

%d bloggers like this:
Malcare WordPress Security