Which condition causes the maximum hearing loss?
A. Ossicular disruption with intact tymnpanic membraneB. Disruption of melleus and incus as well tympanic membrane
C. Partial fixation of the stapes footplate
D. Otitis media with effusion
The answer is A.
Average Hearing
loss seen in different lesions of conductive apparatus:
Complete obstruction of ear canal = 30dB
Perforation of tympanic membrane (it varies and is
directly proportional to the size of perforation) = 10-40 dB
Ossicular interruption with intact drum = 54 Db
Closure
of oval window = 60 Db