Definitions
The combination of impedance and admittance
What is immittance?
What pathology corresponds to:
-Ipsilateral: R - normal; L - absent
-Contralateral: R - absent; L - elevated
What is early stage otosclerosis?
Normal tympanogram (peak between +50 to -100 da Pa)
What is Type A?
OE-ME-IE-CN8-CN-SOC-CN7-Stapedius-ME
What is the acoustic reflex pathway?
the 3 commonly used immittance measures
What are tympanometry, ARTs, and OAEs?
Refers to the extent to which the system RESISTS the flow of energy
What is impedance?
What pathology corresponds to:
-Ipsilateral: R - normal; L - normal
-Contralateral: R - normal; L - normal
What is superior canal dehiscence?
Flat tympanogram (seen in middle ear fluid, wax blocking the canal, or tympanic membrane perforation)
What is Type B?
Present at 70-100 dB SL
What are normal acoustic reflexes?
Age range for 1000 Hz tympanometry
What is 6 months or younger?
Refers to the EASE at which the energy flows through a system
What is admittance?
What pathology corresponds to:
-Ipsilateral: R - normal; L - absent
-Contralateral: R - absent; L - normal
What is Bell's palsy?
Hypermobile middle ear
What is Type Ad?
Present reflexes above 100 dB SL
What are elevated reflexes?
-normal tympanogram
-absent contra reflexes
-normal ipsi reflexes
What is retrocochlear pathology?
Assessed by measurement of static immittance, tympanometry, and acoustic reflexes
What is middle ear function?
What pathology corresponds to:
-Ipsilateral: R - normal; L - normal
-Contralateral: R - absent; L - absent
What is intra-axial lesion?
Stiffness of middle ear system Ex. Otosclerosis
What is Type As?
Caused by internal noise, patent ET, or high compliance
What is artifact?
- normal tymps
-reduced ARTs
-absent OAEs
What is cochlear pathology?
Measure of tympanometry involved with steepness of slope
What is gradient?
What pathology corresponds to:
-Ipsilateral: R - normal; L - absent
-Contralateral: R - normal; L - absent
What is acoustic neuroma?
Negative Pressure
What is Type C?
The 90th %tile for 500 Hz tone
What is 95 dB SL?
Generates a constant 220 Hz 85 dB SPL tone (referred to as the probe tip) The intensity of this tone is monitored constantly, any change in energy glow through the ME and TM. Probe tone is in the test ear
What is the function of the Probe-tone generator?