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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 ...
Normal tympanometry results 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.
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]
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.
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 ___".
for adults: between 26 and 40 dB HL; for children: between 20 and 40 dB HL [4] Moderate: between 41 and 54 dB HL [4] Moderately severe: between 55 and 70 dB HL [4] Severe: between 71 and 90 dB HL [4] Profound: 91 dB HL or greater [4] Totally deaf: Have no hearing at all. This is called anacusis.
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Acoustic immittance audiometry - Immittance audiometry is an objective technique which evaluates middle ear function by three procedures: static immittance, tympanometry, and the measurement of acoustic reflex threshold sensitivity. Immittance audiometry is superior to pure tone audiometry in detecting middle ear pathology. Tympanometry