Which of the following conditions causes maximum hearing loss
Ossicular disruption with intact tympanic membrane
Disruption of malleus and incus with intact tympanic membrane
Ottitis media with effusion
Paial fixation ofthe stapes footplate
CONDUCTIVE HEARING LOSS AVERAGE HEARING LOSS SEEN IN DIFFERENT LESIONS OF CONDUCTIVE APPARATUS 1. Complete obstruction of ear canal: 30 dB 2. Perforation of tympanic membrane (It varies and is directly propoional to the size of perforation): 10-40 dB 3. Ossicular interruption with intact drum: 54 dB 4. Ossicular interruption with perforation: 38 dB 5. Malleus fixation: 10-25 dB 6. Closure of oval window: 60 dB Note here that ossicular interruption with intact drum causes more loss than ossicular interruption with perforated drum. Ref:- Dhingra; pg num:-29
Ear