Operating instructions

otorrhea External ear discharge.
otosclerosis A genetic abnormality of the temporal bone, frequently causing
fixation of the stapes and conductive hearing loss.
sound pressure The average (rms) difference between the air pressure that
occurs during sound transmission and the ambient air pressure.
tympanogram A recording of the admittance of the ear as a function of ear
canal air pressure.
tympanometric gradient See tympanometric width.
tympanometric peak pressure The value of ear canal air pressure at which
the tympanometric peak occurs.
tympanometric width A measure of the shape of the tympanogram in the
region of the tympanometric peak. Defined as the width of the tympanogram
(in decapascals) at 50% of peak eardrum admittance, tympanometric width
is a good indicator of the presence of middle ear effusion.
tympanometry The measurement of acoustic admittance in the sealed ear
canal as a function of ear canal air pressure.
tympanosclerosis A complication of otitis media that is characterized by
sclerotic regions involving the tympanic membrane, ossicles, and middle ear
mucosa. Tympanosclerosis increases the stiffness of the middle ear system.
volume velocity The volume of air that passes through a plane per unit time.
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