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Physiology of hearing and hearing loss

Question
32 out of 39
 

Otitic barotrauma results due to: (PGI June 2011)



A Ascent in air
B Descent in air

C Linear acceleration
D Sudden acceleration

Ans. B Descent in air Ref. Dhingra 5th/ed p 74, 6th/ed p 66

Otitic Barotrauma: It this condition, Eustachian tube fails to mantain middle ear pressure at ambient atmospheric level

Etiology: Rapid descent during airflight

Underwater diving

Compression in pressure chamber.

Mechanism

When middle ear pressure rises

Normal eustachian tube

Allows passage of air from middle ear to pharynx

In case if atmospheric pressure is more

than middle ear pressures by > 90 mmhg

Locking of eustachian tube

Sudden negative pressure in middle ear

Retraction of tympanic membrane, hyperemia,

transudation with haemorrhage

Aero otitis media

Clinical Features

Severe earache, deafness, tinnitus, vertigo.

On examination - Tympanic membrane is retracted, congested or there may be effusion in middle ear.

Conductive type of hearing loss is present.

Precautions

Avoid traveling during upper respiratory infection.

Avoid sleep during descent.

Do Valsalva or swallowing or yawning during descent of flight.

Treatment

Middle ear ventilation should be restored by decongestants, catheterization or even myringotomy.

Physiology of hearing and hearing loss Flashcard List

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