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

1. Introduction to Basic
Audiology

2. Introduction to Diagnostic
Audiology
 Pure tone air-conduction
 Bone-conduction
 Speech Audiometry
 Acoustic immittance

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. Audiogram

5. Unmasked and Masked Audiometric
Symbols

6. “No Response” Audiometric Symbols

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. Types of Hearing Loss
 Type Site Example
 Conductive Outer/Middle Cerumen/OM
 SensorineuralInner Aging/noise
 Mixed Outer/Middle Cerumen/aging
Inner

9. Headphones

10. Headphones

12. Insert Earphones

13. Bone Vibrator

14. Bone Conduction

15. Bone Conduction Calibration

16. Relationship between air and bone
conduction thresholds and type of loss

17. Example of Masking

18. Normal Audiogram

19. Bilateral Conductive HL

20. Example of SNHL

21. Example of a Mixed HL

22. Example normal Left, SNHL right

25. 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

26. Spondee Word List

27. Interpretation of Word Recognition

28. Example of NU-6 Word Recognition List