Which of the following causes maximum hearing loss?
Average hearing loss in different lesions: Complete obstruction of ear canal = 30db Perforation of tympanic membrane = 10-40 db Ossicular interruption with intact tympanic membrane= 54db Ossicular interruption with perforation = 38db Closure of oval window can cause 60 db hearing loss
Complete obstruction of ear canal
Perforation of tympanic membrane
Ossicular interruption with intact tympanic membrane
Ossicular interruption with perforation