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Download PowerPoint Presentation - Objective Tests of the Auditory System
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Transcript
Objective Tests Acoustic Immittance Otoacoustic Emissions Auditory Evoked Potentials Acoustic Immittance 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 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) Diagnostic Significance Conductive Loss Sensorineural Loss Cochlear Loss Retrocochlear Loss Otoacoustic Emissions 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 Auditory Evoked Potentials Instrumentation Auditory Brainstem Response Audiometry (ABR) Other AEPs Auditory Evoked Potentials Instrumentation Auditory Evoked Potentials 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 Summary of Auditory Evoked Potentials AEP Site Application Electrocochleography VIII Nerve Hearing Testing ABR VIII Nerve and Brainstem See Previous Middle Latency Response Primary Auditory Cortex Hearing Testing Late Vertex Response Upper Level Cortex Central Auditory Problems P300 Frontal Lobe Physiological Psychology Summary you are not responsible for chapter 7 of text
