Transcript Screening Tests

Screening Tests for
DISORDERS!!!
Or Crusading the Clinic
Audiometry
(Mencher Chapter 3)
 Basic hearing test
waves 125 – 8000 Hz
 Speech range
 Sine
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Few audiometers test over 10 kHz
If Tinnitus
 Narrow
band noise
 Warble tones
Narrow frequency range
 Allows differentiation from tinnitus

More Audiometry Variables

Insert earphones vs. supra-aural earphones
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Reduce background noise (25 vs. 6 dB HL, respectively)
Interaural attentuation
Collapsed ear canal
 Masking Noise
 Isolate hearing in one hear
 Eliminate ‘good ear’

Bone Conduction
 By-pass
middle ear
 Bone to cochlea

Earphone vs. Bone conduction comparison

Tympanogram
Tympanometry
 Maps pressure vs. mobility
 Response of Tympanic Membrane
 Normal = smooth curve (no asymetry)
 Flat Response
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Effusion
Ossification
Peaked response

Perforation
 Efficiency

of Middle ear
Acoustic Reflex
 Reflex of stapedial muscle
 85 dB Hl stimulus
 Presence/Absence
 Timing of response
 Cerumen build-up to Retrocochlear abnormalities
Acoustic Brainstem Response

Acoustic brainstem
response (ABR)
 Procedure:
Present Click or
tone pip
 Use electrodes to measure
brainstem response

Magnitude


Latency
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Normal range
Acoustic Neuroma
Unresponsive subjects
 Baby
hearing