Impedance audiometry
Shruti Speech And
Hearing Clinic
Also called as Tympanometry, Impedance Audiometry is an objective method based on the measurement of the pressure in the middle ear, stapedius reflexes, and tension of the tympanic membrane. Impedance audiometry is completely painless and noninvasive. The audiologist inserts the probe tube into the ear. The entire arrangement is such that the entry of air in your ear remains completely blocked throughout the test. Tympanometry measures the pressure in the middle ear while the audiologist changes the pressure in the ear canal.
Stapedius reflex test is used to measure the sound tolerability of your ear. Your ear is exposed to middle and high-frequency stimulus sounds (500, 1000, 2000, and 4000 Hz). The test will check whether the contraction of the stapedius muscle is present at a particular frequency of sound. Eustachian tube patency or functioning test checks for how much the eustachian tube is open. The audiologist will ask you to swallow several times or yawn to check if the eustachian tube can clear the pressure. Several types of this test exist. Some of the types help evaluate the efficacy of treatments to improve Eustachian tube dysfunction. The result of the impedance audiometry is a graph known as a tympanogram. The tympanogram shows values of the intensity of acoustic reflex on the frequencies 0.5, 1, 2, and 4 kHz.
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