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Immittance Testing

Acoustic Immittance The ease of (or opposition to) flow of sound through a system.
What is "immittance" composed of? Acoustic Impedance and acoustic admittance
Acoustic Impedance The opposition to the transfer of acoustic energy through the auditory system. Measured in acoustic ohms (Za). How much sound bounces back - the harder the surface the more sound bounces back (not a lot of sound going through).
Acoustic Admittance The ease of energy flow or transfer of acoustic energy through the auditory system. Reciprocal of impedance. Measured in mmhos (Ya).
What are the components for dissipation of energy? Acoustic Resistance (Impedance) and Acoustic Conductance (Admittance)
What are the components for storage of energy? Acoustic Reactance (Impedance) and Acoustic Susceptance (Admittance)
What type of system is dominant at low frequencies? High frequencies? At low frequencies the system is stiffness dominant. At high frequencies the system is mass dominant.
What are the four basic immittance measures? Tympanometry (measure immittance as a function of air pressure), acoustic (stapedial) reflex measures (measurement of immittance as a function of loud sounds), eustachian tube function (measurement of patency of eustachian tube), fistula (vertigo testing)
What are the norms for compliance in infants (over 6 months old)? For children aged 1-8 yrs old? >.20 mmhos for infants and >.30 mmhos for children ages 1-8 yrs old
What are the equivalent ear canal volumes for neonates? Children? Adults? Patent tubes in children? 1) Neonates: usually < .50cc 2) Children: .30-1.0 (0.9) cc 3) Adults: 0.65 (.63) - 1.75 (1.46) cc 4) Patent tubes in children: 1.0 - 5.5 cc
What is the pump speed of the tympanometer on screening mode? Diagnostic mode? Screening - 200 daPa/second and Diagnostic - 50 daPa/second
What is the ASHA screening guideline for TW for "abnormal" results? AAA screening guideline? ASHA > 200 daPa and AAA > 250 daPa
What is considered "abnormal" diagnostically for TW? TW > 275 daPa
According to ASHA, what is the referral criteria for tympanometry? 1) drainage, abnormality of ear canal, TM, or ear that was previously undetected 2) Volume > 1.0 cc and flat tympanogram (if not already under physician care
You would repeat tympanometric screening in 6-8 weeks if.... 1) Compliance < .30 mmho (children) or < .20 mmho (infants) 2) Width > 200 daPa (children) or >235 daPa (infants) 3) If second screening fails, refer to physician
What are the biological reasons for acoustic reflexes? 1) Intensity control 2) Static control/position 3) Low frequency regulation
What are the clinical purposes of acoustic reflex testing? 1) Det. site of dysfunction via comparing ipsi and contra-lateral responses 2) Det. hearing sensitivity and/or site of dysfunction via acoustic reflex threshold measures 3) Det. status of ME, cochlea, VII and VII nerve, and brainstem
Created by: duda713