What is Tympanogram?

Why do hospitals perform Tympanometry

It’s not just for children — seniors can also undergo this test to understand the condition of their hearing!

Today, hearing loss in children is especially important because children who experience hearing loss without proper care may face negative effects on language development, learning, emotional health, and social opportunities as they grow into adults. One test that can help identify hearing problems in infants and children is Tympanometry. Hospitals sometimes also perform Tympanometry in seniors to determine whether hearing issues are caused by middle ear problems. This is useful for improving daily communication and ensures that hearing aids, if needed, can work effectively for older adults.

Tympanometry is a test of middle ear function using air pressure; it is not a hearing test. It is performed because the results can indicate abnormalities in the middle ear, such as:

  • Fluid accumulation in the middle ear

  • Stiffening of the ossicles, which is more common in seniors

  • Eustachian tube dysfunction, often seen in children due to underdeveloped tubes, making them more prone to inflammation

When tested at 226 Hz, the tympanogram produces a single, sharp peak, which can be analyzed for abnormalities.

How to read a tympanogram:

  • The horizontal axis (X) represents air pressure

  • The vertical axis (Y) measures the movement of the eardrum and middle ear system in response to pressure changes

Next, let’s look at sample test results.

Type A

This test result indicates normal middle ear function.

Type As

Similar to Type A, but with a reduced peak, indicating reduced middle ear compliance. This means the eardrum does not move well, as seen in conditions like otosclerosis.

Type AD

This type shows an excessively high peak, indicating that the middle ear is too flexible, causing the eardrum to move excessively. It may be associated with conditions such as ossicular discontinuity.

Type B

This type shows no peak at all, indicating a stiff middle ear with no compliance. It may be caused by conditions such as otitis media with effusion (OME) or cholesteatoma in the middle ear.

Type C

This type shows a peak shifted toward the negative pressure side on the X-axis, indicating Eustachian tube dysfunction.

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