Audiology PowerPoint 5
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| The main principles of tympanometry are to: | show 🗑
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| Transmission through the tympanic membrane is best when: | show 🗑
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| If there is a difference of pressure: | show 🗑
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| Impedance | show 🗑
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| compliance | show 🗑
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| When doing a tympanometry, you are assessing... | show 🗑
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| show | device delivers a tone to a sealed volume (EAM) and detect the sound level changes as the pressure is varied
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| The pressure pump (function)... | show 🗑
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| The speaker (function)... | show 🗑
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| show | measures the loudness in the external auditory meatus (how much sound is reflecting back)
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| show | part of the sound is absorbed and sent via middle ear to the inner ear while part of the sound is reflected. The stiffer the tympanic membrane the more sound is reflected.
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| show | 1) The probe tip is inserted into the external auditory canal to make a tight seal, 2)A pure tone is delivered to the external auditory meatus, 3) The pump decreases the ear canal pressure to ~ -200 daPa, then increases the pressure to ~ +200 daPa,
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| show | goes down.
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| show | goes up.
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| Tympanogram | show 🗑
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| show | when there is no difference of pressure between the EAM and the middle-ear cavity / ET
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| Pressure in the external auditory meatus is varied from _________________ while monitoring compliance | show 🗑
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| show | blowing air into the EAM
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| show | sucking air out of the EAM
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| show | maximal mobility
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| show | 0.2 through 1.4 ml
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| If peak is < .02 ... | show 🗑
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| If peak is > 1.4 ... | show 🗑
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| show | the pressure at which pressure equalization occurs on both sides of the tympanic membrane. It also indicates the pressure at which peak compliance or maximum mobility is attained.
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| normal range of pressure | show 🗑
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| show | indicative of poorly functioning Eustachian tube or possibly some fluid.
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| show | often associated with onset of otitis media
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| show | indicates the range of pressure peak and compliance peak values associated with normal middle-ear function
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| show | A, B, and C
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| show | represents normal ME function
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| Type A-s | show 🗑
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| show | Represents hypermobile or hyperflaccid ME: deep curve with normal ME pressure but tall peak of abnormally compliant ME ->indicative of a flaccid TM due to disarticulation of the ossicular chain, loss of elastic fibers in the TM, thin TM
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| show | represents a restricted tympanic membrane mobility: no sharp peak, with little or no variation in impedance over a wide range of pressure. This curve is usually typical of a stiff ME secondary to non-compressible fluid in the ME (otitis media)
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| show | represents significant negative pressure in the middle ear cavity: normal compliance but the peak compliance is significantly below zero, indicating negative pressure in the ME space. This curve is usually typical of Eustachian tube dysfunctions.
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| Normal adult range of EAM volume | show 🗑
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| If the EAM volume is abnormal... | show 🗑
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| If EAM volume is > 2ml, due to... | show 🗑
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| If EAM volume is <0.6, due to... | show 🗑
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