In otosclerosis Carhart's notch dips at:
1000 Hz in AC
1000 Hz in BC
2000 Hz in AC
2000 Hz in BC
(d) 2000HzinBC(Ref. Shambaugh, 6th ed., 532)In otosclerosis the dip at 2000Hz is seen in bone conduction curve which is known as Carhart's notch. Mnemonic: Carhart's in Bone Conduction, CBC.
Otosclerosis