Tests For Hearing
Gelle's test is done in: (LQ)
|D||Serous otitis media|
Gelle's test was once a popular test to find out stapes fixation in otosclerosis, but now it has been superseded by tymponometry.
In this test, bone conduction is tested and at the same time Siegel's speculum compresses the air in the meatus.
Normally, when air pressure is increased in ear canal (by Siegel's speculum)
Normally, when air pressure is increased
in ear canal (by Siegel's speculum)
Pushes the tympanic membrane inward
Ossicles are pushed inward
↑ intralabyrinthine pressure
Immobilty of basilar membrane
↑ ed hearing . test is positive
But if ossicular chain is fixed or disrupted, no such phenomenon occurs . test is negative.
Gelle's test is positive: In normal individuals, SNHL.
Gelle's test is negative: In case of fixed ossicular chain (otosclerosis) or if ossicular chain is disconnecteD.
[Ref. Dhingra Sth/ed p42, 6th/ed p 37; Tuli 1st/ed p37]