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8 Cards in this Set
- Front
- Back
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What is tympanometry
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A dynamic measure of middle ear function, measuring acoustic immittance, changes of the middle ear due to air presure changes in the external ear canal.
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What are the three main types of tympanograms?
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Types A, B and C.
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What are the characteristics of Type A?
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sharp peak in immittance from 0 daPa of air pressure and declining immitance of air pressure
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What are the subtypes associated with Type A tympanograms?
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Type A sub s, Type A sub d
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What are the characteristics of Type A sub s?
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The sub s stands for stiffness/shallowness; therefore, representative of a reduction in energy flowing through the middle ear caused by ossicular chain stiffness. Otosclerosis is the most common example.
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Describe Type A sub d
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Subtype d represents deep/discontinuity; therefore, ossicular chains is too loose. This will cause an abnormal increase in energy flowing through the middle ear due to the absent resistance of cochlear fluid resulting in increase levels of tympanic membrane movement.
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Describe Type B
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Flattened due to increased mass to the ossicular chain caused by fluid buildup in the middle ear. Example are ottitis media with effusion.
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Describe Type C
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Faulty Eustachian tube function causes air to be trapped in the middle ear and eventually is absorbed, reducing air pressure. This results in the middle ear to have negative pressure (reduced air pressure as compared to the external ear canal).
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