Introduction to Basic Audiology

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Introduction to Basic Audiology posted at Cairo University Audiology Unit, Cairo University, the leading educational resource for Audiology in Egypt

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Introduction to Basic Audiology

  1. 1. Introduction to Basic Audiology
  2. 2. Introduction to Diagnostic Audiology  Pure tone air-conduction  Bone-conduction  Speech Audiometry  Acoustic immittance
  3. 3. Audiometric Evaluation  Otoscopic observation (excessive cerumen, foreign body, etc)  Comprehensive case history  Audiometric testing: Air conduction .25-8K Hz. Bone-conduction .5-4K Hz  Speech Audiometry: SRT, Word recognition  Acoustic Immittance: Tympanometry, acoustic reflexes, reflex decay
  4. 4. Audiogram
  5. 5. Unmasked and Masked Audiometric Symbols
  6. 6. “No Response” Audiometric Symbols
  7. 7. Hearing Loss  Normal hearing for adults=0 to 20 dB  Mild hearing loss =21 to 40 dB  Moderate hearing loss=41 to 55 dB  Moderately Severe hearing loss=56 to 70 dB  Severe hearing loss=71 to 90 dB  Profound hearing loss=90+ dB  For children: 0-15 dB normal  16-20 dB=borderline normal
  8. 8. Types of Hearing Loss  Type Site Example  Conductive Outer/Middle Cerumen/OM  SensorineuralInner Aging/noise  Mixed Outer/Middle Cerumen/aging Inner
  9. 9. Headphones
  10. 10. Headphones
  11. 11. Insert Earphones
  12. 12. Bone Vibrator
  13. 13. Bone Conduction
  14. 14. Bone Conduction Calibration
  15. 15. Relationship between air and bone conduction thresholds and type of loss
  16. 16. Example of Masking
  17. 17. Normal Audiogram
  18. 18. Bilateral Conductive HL
  19. 19. Example of SNHL
  20. 20. Example of a Mixed HL
  21. 21. Example normal Left, SNHL right
  22. 22. Spondee Threshold  Magnitude of HL for speech  Reference for word recognition testing  Agreement with pure-tone average (PTA)  ~10 dB  Malingering  May not agree in cases of precipitous HFSNHL
  23. 23. Spondee Word List
  24. 24. Interpretation of Word Recognition
  25. 25. Example of NU-6 Word Recognition List

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