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Physiology of hearing and hearing loss

Question
34 out of 39
 

Post head injury, the patient had conductive deafness and on examination, tympanic membrane was normal and mobile. likely diagnosis is: (LQ)



A Distortion of ossicular chain

B Haemotympanum

C EAC sclerosis

D Otosclerosis

Ans. A Distortion of ossicular chain Ref. Logan Turner I Oth/ed p 347

In post head injury, the conductive deanfess may occur due to:

Fracture temporal bone (more commonly longitudinal) extending to external canal: tympanic membrane is frequently torn and inner ear is spareD.

Blood or CSF in external and middle ear.

Damage to ossicle (most frequent being incudo-stapedial joint) resulting in more severe and permanent conductive deafness.

Aseptic necrosis of long process of incus canlead to late conductive deafness.

In the Question it is given:

Tympanic membrane is normal and mobile: Inhemotympanum - tympanic membrane will appear red/blue [due to presence of blood pigments) so it is ruled out. ... Logan Turner 10th/ed p441

Otosclerosis and EAC sclerosis do not occur in case of head injury \ they are ruled out

Also Know

Causes of SNHL in case of head injury:

Labyrinthine concussion

Vestibular damage

Physiology of hearing and hearing loss Flashcard List

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