Carha's notch in audiometry is seen in:
TheCarha notchis a depression in the bone-conduction audiogram of patients with clinical otosclerosis. It is different at different frequencies but maximum at 2000hz and it called Carha notch. which correspond to the resonance frequency of the middle ear, can be substantially improved following successful stapes surgery.
Ossicular discontinuity
Hemotypanum
Otomycosis
Otosclerosis
DNB 2018