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Physiology of hearing and hearing loss

Question
35 out of 39
 

All are causes of sensorineural deafness Except: [AIIMS May 2014]



A Old age
B Cochlear otosclerosis

C Loud sound
D Rupture of tympanic membrane

Ans. D Rupture of tympanic membrane Ref. Dhingra Sth/ed pg 38, 6th/ed p 32

SNHL - Sensorineural hearing loss:

It results from lesions of cochlea, Vilith nerve or central auditory pathways

" It maybe present at birth . congenital (explained in detail Jater)or may be acquireD.

Common Causes of Acquired SNHL

Infection of labyrinth - viral, bacterial or spirochetal

Trauma to labyrinth (as in # of temporal bone)

Noise induced hearing loss

Ototoxic drugs

Old age/Presbycusis

Meniere's disease

Acoustic neuroma

Sudden hearing loss

Systemic diseases like diabetes, hypothyroidism, kidney disease, Autoimmune diseases, multiple sclerosis, blood dyscrasias

Familial progressive SNHL.

From the above list-It is clear that Option a . old age and option c . loud sound-cause SNHL

Since SNHL results from lesions of cochlea - cochlear otosclerosis which is a variant of normal otosclerosis (which causes conductive deafness) will cause sensorineural deafness (. option b is correct) Perforation / Rupture of tympanic membrane causes conductive deafness and not- SNHL.

Note

Loud noise can lead to both SNHL and conductive deafness (which occurs only in case of severe blast).

Physiology of hearing and hearing loss Flashcard List

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