Screening Tests for DISORDERS!!!

1
Screening Tests for DISORDERS!!!

• Or Crusading the Clinic

2
Audiometry (Mencher Chapter 3)

• Basic hearing test
• Sine waves 125 8000 Hz
• Speech range
• Few audiometers test over 10 kHz
• If Tinnitus
• Narrow band noise
• Warble tones
• Narrow frequency range
• Allows differentiation from tinnitus

3
More Audiometry Variables

• Insert earphones vs. supra-aural earphones
• 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

4
Tympanometry

• Tympanogram
• Maps pressure vs. mobility
• Response of Tympanic Membrane
• Normal smooth curve (no asymetry)
• Flat Response
• 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

5
Acoustic Brainstem Response

• Acoustic brainstem response (ABR)
• Procedure Present Click or tone pip
• Use electrodes to measure brainstem response
• Magnitude
• Normal range
• Latency
• Acoustic Neuroma
• Unresponsive subjects
• Baby hearing