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Reading an Audiogram

Reading an Audiogram. A/C Via TDH-50P headphones Placed on Pinna Checks the validity of entire ear system Tests that ipsilateral ear. B/C Bone vibrator Placed on Mastoid Process Tests the validity of only the inner ear Tests better cochlea. Air vs. Bone Conduction.

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Reading an Audiogram

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  1. Reading an Audiogram

  2. A/C Via TDH-50P headphones Placed on Pinna Checks the validity of entire ear system Tests that ipsilateral ear B/C Bone vibrator Placed on Mastoid Process Tests the validity of only the inner ear Tests better cochlea Air vs. Bone Conduction

  3. Things to know about an Audiogram • Lo to Hi Frequency (abscissa) • 125 Hertz to 8000 Hertz • Octave and half-octaves • Lo to Hi dB (ordinate) • -10 dB HL to 120 dB HL • Each dB is equal to one octave • It is a Legal document 20

  4. The Legend

  5. Ranges of Hearing Loss • -10 – 25 dB HL = Normal range • 26 – 40 dB HL = Mild hearing loss • 41 – 55 dB HL = Moderate • 56 – 70 dB HL = Moderately Severe • 71 – 90 dB HL= Severe • Greater than 90 dB HL = Profound

  6. Normal Hearing

  7. Conductive Hearing Loss

  8. Sensorineural Hearing Loss

  9. Mixed Hearing Loss

  10. Other “Hearing” Tests • Tympanometry • Acoustic Reflexes • Speech Audiometry • Speech Reception Threshold (SRT) • Speech Discrimination (SD) • ABR • ECOCHG (Electrocochleography) • OAE

  11. What about Hearing Aids • Minimal hearing loss • Probably no/little benefit • Moderate hearing loss and usually sensorineural hearing loss are good candidates • Profound hearing loss? • Could for environmental & safety reasons • Cochlear Implant

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