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A normal tympanogram (called "type A") shows that your eardrum moves easily in response to changes in air pressure. It resembles a mountain or teepee. Abnormal tympanometry results
Tympanometry is an acoustic evaluation of the condition of the middle ear [1] eardrum (tympanic membrane) and the conduction bones by creating variations of air pressure in the ear canal. Tympanometry is an objective test of middle-ear function. It is not a hearing test, but rather a measure of energy transmission through the middle ear. It is ...
The method consists of 50 sets of six monosyllabic words that differ in initial or final consonant (e.g. not, tot, got, pot, hot, lot or ray, raze, rate, rave, rake, race). The listener is typically presented with one of the words in the couplet preceded by a phrase, "You will mark the word ___".
The results of pure-tone audiometry are however a very good indicator of hearing impairment. Hearing disability is defined by the WHO as a reduction in the ability to hear sounds in both quiet and noisy environments (compared to people with normal hearing), which is caused by a hearing impairment. [17]
This test is usually abnormal with conductive hearing loss. A type B tympanogram reveals a flat response, due to fluid in the middle ear (otitis media), or an eardrum perforation. [5] A type C tympanogram indicates negative middle ear pressure, which is commonly seen in eustachian tube dysfunction. [5]
The result is a tympanogram showing ear canal volume, middle ear pressure and eardrum compliance. Normal middle ear function (Type A tympanogram) with a hearing loss may suggest presbycusis. Type B and Type C tympanograms indicate an abnormality inside the ear and therefore may have an additional effect on the hearing.
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Otosclerosis is traditionally diagnosed by characteristic clinical findings, which include progressive conductive hearing loss, a normal tympanic membrane, and no evidence of middle ear inflammation. The cochlear promontory may have a faint pink tinge reflecting the vascularity of the lesion, referred to as the Schwartz sign .