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  • MIE 305 NCSU Chapters 1-4
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Chapter 3 CAOHC Study Guide (1)

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Chapter 3 CAOHC Study Guide (1)

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Chapter 3 CAOHC Study Guide
outer, middle, inner - ANS-3 parts of the ear

outer ear - ANS-pinna and external ear canal

middle ear - ANS-tympanic membrane and ossicles; eustachian tube

inner ear - ANS-cochlea, vestibule, semi-circular canals, and auditory nerve

normal hearing in adults - ANS-hearing thresholds between 0 dB HL and 25 dB HL between 250
- 8000 Hz

9 possible causes of conductive hearing loss - ANS-cerumen
collapsed ear canal
external otitis
foreign body
perforated TM
ossicular chain discontinuity
otitis media
ET dysfuntion
otosclerosis

9 possible causes of sensorineural hearing loss - ANS-presbycusis
sudden hearing loss
congenital deafness
Meniere's disease
retrocochlear HL
ototoxic medication
workplace chemicals and noise exposure
NIHL
acoustic trauma

AAO-HNS Medical Referral Criteria for OHCP - ANS-baseline audiogram
periodic audiograms
medical criteria

baseline audiogram - ANS-average hearing level at 500, 1000, 2000, and 3000 Hz greater than
25 dB in either ear; difference in average hearing level between the better and poorer ears of
more than 15 dB at 500, 1000, and 2000 or more than 30 dB at 3000, 4000, and 6000

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