Impedance audiometry is done in?: (A) Otomycosis, (B) Meniere's disease, (C) Pressure changes in middle ear, (D) Cholesteatoma
Answer is C. It is an objective test, widely used in clinical practice and is paicularly useful in children. It consists of: Tympanometry Acoustic reflex measurements By changing the pressure in a sealed external auditory canal and then measuring the reflected sound energy, it is possible to find the compliance or stiffness of the tympano-ossicular system and thus find the healthy or diseased status of the middle ear.