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23 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Static Compliance
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A measurement of the mobility of the tympanic membrane
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How high the ear drum moved
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Tympanometry
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measurement of the pressure compliance function of the tympanic membrane
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Acoustic reflex
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contraction of one or both of the middle ear muscles in response to a loud sound
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put loud sound in ear and measure loud sound responding back
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Loudspeaker
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Emits a pure tone known as the incident wave (usually 220 Hz, but must use higher frquency 660 or 1000 for testing newborns)
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Microphone
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Records the sound in the ear canal (incident wave and the reflected wave from te eardrum)
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Air Pump
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Creates either a + or - air presure in the ear canal; calibrated in mm H2O or daPa
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Type A
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normal Pressure (+/- 100 mm H2O)
Normal Compliance Conditions: Normal Hearing SNHL |
about 75% people with normal hearing have Type A Tympanogram. Normal compliance level 4-1.4 or even higher.
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Type A.S
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Normal pressure (+/- 100 mm H2O
Low compliance Conditions: Otosclerosis Thickened/Scarred eardrum |
Peak is much lower from type A. Peak is around .1,.2,.3
S stands for Stiffness |
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Type C
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Negative pressure (<-150 mmH2O)
Normal compliance Conditions: Eustacian tube dysfunctioning |
Eustacian tube blocked
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Type B
(no canal volume 0.00 ml) |
Flat tympanogram
Conditions: Cerum Probe tip against canal wall |
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Type B
(Normal canal volume 0.4-1.5 ml) |
Flat typmpanogram
Conditions: Otitis Media |
fluid filled behind middl eardrum
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Type B
(High canal volume >2.0 ml) |
Flat tympanogram
Conditions: perforated eardrum Patent ventilating tube |
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Jerger
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Name of tympanogram classification
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Acoustic reflex
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Contracting of the middle ear muscles, primarily the stapedius muscles, to loud sounds.
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Ipsilateral
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Stimulates one ear; records in the same ear.
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Contralateral
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Stimulates one ear; records in the opposite ear.
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Acoustic Reflexs two modes of presentation
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Ipsilateral and Contralateral
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Patient must be completely silent during test ( no talking, chewing gum or movement of jaw)
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Normal hearing
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70-90 dB HTL
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Conductive hearing loss
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Absent
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Mild SNHL (<40 dB HTL)
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70-90 dB HTL
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Mod-Profound SNHL
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Absent
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Retrocochlear loss
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Elevated or absent
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Otoacoustic Emission
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●Sounds emanating from the cochlea that can be detected in the external auditory canal with probetube microphone
● Low-level sounds emitted by the cochlea, either spontaneously or as an echo or other soun evoked by an auditory stimulus, related to the function of the outer hair cells (OHCs) of the cochlea |
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