Question
Identify the type of tympanogram shown in the picture below ?
A. Type A.
B. Type B.
C. Type C.
D. Type D.
Show Answer
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Correct Answer » A Explanation |
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Ans;A. Type A.
Tympanometry
- It is a test of middle ear functioning. It looks at the flexibility (compliance) of the eardrum to changing air pressures, indicating how effectively sound is transmitted into the middle ear. A typical tympanometry result indicates the ear canal volume (cm3), the max pressure (daPa) and the peak compliance (ml).
TYPE A
- Suggests normal middle ear functioning
- Peak is between +/- 100 daPa
- Compliance from 0.3-1.5 ml.
TYPE AD
- Suggests a highly compliant middle ear system(ossicular discontinuity or thin and lax tympanic membrane)
- Peak is between +/- 100 daPa
- Compliance is more than 1.5 ml.
TYPE AS
- Suggests a less compliant middle ear system(otosclerosis, malleus fixation)
- Peak is between +/- 100 daPa
- Compliance is less than 0.3 ml.
TYPE B
- Suggests middle ear involvement from fluid (middle ear effusion)
- There is no identifiable peak
- Ear canal volume is normal.
TYPE C
- Suggests Eustachian Tube dysfunction (often seen just before or after effusion)
- Peak is below – 100 daPa
- Compliance from 0.3-1.5 ml
