How do you interpret tympanogram results?

How do you interpret tympanogram results?


  1. Type A. Suggests normal middle ear functioning. Peak is between +/- 100 daPa. Compliance from 0.3-1.5 ml.
  2. Type Ad. Suggests a highly compliant middle ear system. Peak is between +/- 100 daPa. Compliance is more than 1.5 ml.
  3. Type As. Suggests a less compliant middle ear system. Peak is between +/- 100 daPa.

What type of tympanogram is considered normal?

Tympanogram tracings are classified as type A (normal), type B (flat, clearly abnormal), and type C (indicating a significantly negative pressure in the middle ear, possibly indicative of pathology).

What does Type B tympanogram indicate?

Type B tympanograms are a flat line (Figure 2), which is consistent with middle ear pathology, such as fluid or infection behind the ear drum. This indicates negative pressure in the middle ear space, often consistent with sinus or allergy congestion, or the end-stages of a cold or ear infection.

What does a Tympanogram measure?

Tympanometry measures ear canal volume (ECV), tympanic membrane mobility (compliance), and middle ear pressure (pressure). The ability to measure tympanic membrane mobility and middle ear pressure is useful in the assessment of middle ear condition and functioning, which can contribute to conductive hearing loss.

What does flat Tympanogram mean?

A flat tympanogram (type B) means a stiff tympanic membrane and predicts fluid in the middle ear (a positive predictive value of approximately 90%). A normal tympanogram (type A) means a middle ear without fluid and an intact tympanic membrane (a negative predictive value up to more than 95%).

Why is tympanometry 226 Hz?

The most commonly used probe tone has been 226Hz. This probe tone has some definitive advantages when testing the adult ear. That’s because the adult middle ear system is stiffness-dominated (compliance) at this frequency and the effects of mass and friction are minor.

What type of hearing loss might you expect if a patient presents with a Type B Tympanogram?

Type B Tympanogram – Audiologists see a Type B usually when there is fluid filling up the middle ear space (red line). They can also see a Type B when there is a hole in the eardrum (blue line) that will be higher on the graph than the fluid. Conductive hearing loss is often associated with Type B.

What does a type a curve look like on a tympanogram?

Figure 5 shows the “Type A” curve of a normal tympanogram. This curve is shown as a thick dark line against the shaded area (shading shows the area a “normal” tympanogram would fall into). In a “Type A” curve, the peak compliance occurs at or near atmospheric pressure indicating normal pressure within the middle ear.

What is the purpose of a tympanogram?

A tympanogram provides information regarding the compliance of the middle ear system (how well sound passes through the eardrum to the middle ear system), ear canal volume, and middle ear pressure. Compliance is plotted vertically on the tympanogram, and is measured in ml or mmho.

What are the different types of tympanometry graphs?

The graphs obtained after conducting tympanometry are classified into the following types based on the compliance and the peak of the graph: 1. Type A Tympanogram Type A resembles a teepee and shows a normal middle ear system that has no fluid and an intact tympanic membrane.

What does a flat tympanogram indicate?

Type B shows a flat line. It indicates a constant middle ear pathology which is a build-up of fluid or ear infection behind the eardrum. A flat tympanogram (type B) also indicates a stiff tympanic membrane. Some of the cases of type B shows – presence of hole inside the eardrum, the dissimilarity lies in the ear canal volume,