Audiogram in early Meniere's disease shows:: (A) Notch at 2 kHz in bone conduction, (B) Notch at 4 kHz in air conduction, (C) A flat curve, (D) A rising curve
Answer is D. In early cases of Meniere's disease low frequencies are affected more and the audiogram shows a rising curve. In long-standing cases, audiogram becomes fiat and then falling type.Notch at 2 kHz in bone conduction is typically seen in Carhart's notch seen in otosclerosis (5 dB at 500 Hz, 10 dB at 1000 Hz, 15 dB at 2000 and 5 dB at 4000 Hz).Notch at 4 kHz both in air and bone conduction is seen in noise-induced hearing loss. As the duration of noise exposure increases, notch at 4 kHz deepens and widens to involve other frequencies.