"Boiler's notch" is suggestive of ?: (A) Conductive Hearing Loss, (B) Noise Induced Hearing Loss (NIHL), (C) Both 1 and 2, (D) Normal Finding
Answer is B. Boiler notch/Acoustic dip is seen in Noise induced hearing loss NIHL Boiler notch at 4000Hz Notch is seen in BC curve AC curve notch are insignificant Maximum seen at 3000-6000Hz Sound causing maximum NIHL 2000-3000Hz Stereocilia of Outer hair cells are first to be affected