Acoustic Immittance Otoacoustic Emissions Auditory Evoked Potentials Objective Tests

Instrumentation Ear Canal Measurements Static Immittance (compliance) Tympanometry Acoustic Reflexes Acoustic Immittance

Instrumentation sound source air pump analysis section acoustic reflex stimulus Acoustic Immittance

Ear canal volume predicted by intensity of reflected sound Acoustic Immittance

Ear Canal Volume Normative Data Adults Mean = 1.5 mL 90% range = 0.6 to 1.5 mL Children Mean = 0.7 mL 90% range = 0.4 to 1.0 mL Acoustic Immittance

Static immittance is the measurement of tympanic membrane and middle ear mobility Normative Data for Adults Mean = 0.8 mL 90% range = 0.3 to 1.4 mL Normative Data for Children Mean = 0.5 mL 90% range = 0.2 to 0.9 mL Acoustic Immittance

Tympanometry tracks changes in static immittance over time Acoustic Immittance

Tympanometric (Jerger) types Acoustic Immittance

Tympanometric (Jerger) types Acoustic Immittance

Tympanometric Shape (as recommended by ASHA) Width of the tympanogram at the 50% amplitude point Acoustic Immittance

Normative data for tympanomeric shape Adults Mean = 80 daPa 90% range = 50 to 110 daPa Children Mean = 100 daPa 90% range = 60 to 150 daPa Acoustic Immittance

Acoustic Reflex Anatomy and Physiology Acoustic Immittance

Acoustic Reflex Anatomy and Physiology Acoustic Immittance

Acoustic Reflex Threshold Definition ART for pure tones = 85 to 95 dB HL for normally hearing people ART for Speech = 10 to 20 dB less for pure tones Doesn’t change in people with cochlear loss (up to 50 dB HL) Acoustic Immittance

Conductive Loss Sensorineural Loss Cochlear Loss Retrocochlear Loss Diagnostic Significance

Instrumentation Otoacoustic Emissions

Function Otoacoustic Emissions

Transient Otoacoustic Emissions (TOAEs) Distortion Product Otoacoustic Emissions (DPOAE) Otoacoustic Emissions

Application neonatal hearing screening differential diagnosis monitoring cochlear damage Otoacoustic Emissions

Instrumentation Auditory Brainstem Response Audiometry (ABR) Other AEPs Auditory Evoked Potentials

Instrumentation Auditory Evoked Potentials

Auditory Brainstem Response (ABR) Applications differential diagnosis auditory threshold testing neonatal hearing screening neurosurgical interoperative monitoring Auditory Evoked Potentials

Interpertation for ABR latency amplitude morphology Auditory Evoked Potentials

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