A tympanogram is a measure of the
compliance of the middleear ( the space behind the eardrum ) system mobility (
including the eardrum ).
Tympanogram is an objective method for confirming
abnormalities of theeardrum or middle ear space, such as :
- fluid behind the ear drum
- a hole or perforation of the ear drum
- stiffness of eardrum or middle ear bones ( example,otosclerosis )
The tympanogram is completed by :
- Inserting a probe in the ear and creating a vacuum-tightseal.
- The air pressure is changed in the ear canal from positiveto negative and the movement of the eardrum is recorded.
- The amount and shape of the movement can either exclude orsignify different problems, as previously listed.
- The test is fast, objective, and is not painful ( althoughsometimes the insertion of the probe may upset children ).
When a loud sound is presented to a healthy ear, the eardrum
will contract, asort of built-in hearing protection mechanism ( although it's
not veryeffective ). This contraction of the eardrum is called the acoustic
reflex. Theabsence of this reflex can further confirm problems of the middle
ear, or mayhelp to identify or confirm a hearing loss. Acoustic reflexes are
typicallyevaluated concurrent with the tympanogram.
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