Lady has bilateral hearing loss since 4 years which worsened during pregnancy. Type of impedance audiometry graph will be: (A) Ad, (B) As, (C) B, (D) C
Answer is B. As type is seen where compliance is lower at or near ambient air pressure. This occurs in fixation of ossicles(otosclerosis). Ref: Diseases of EAR, NOSE and THROAT by PL Dhingra 6th Edition page no.24