Impedance audiometry is done in?
Otomycosis
Meniere's disease
Pressure changes in middle ear
Cholesteatoma
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.