Classifications
spontaneous facts
no stimulus needed, not routinely used
2 OAE instruments in clinic
Grason Stadler Inc Corti
Otodynamics Echoport ILO 292
monitor ototoxicity
effect on OHC function, site specific, frequency specific, detect cochlear dysfunction, don't depend on pt's behavior
pediatric audiology
cochlear function, can be asleep, no behavior needed, quick, frequency and ear specific, crosscheck principle
spontaneous info
without external stimuli, most young adults with normal hearing have SOAEs
ensures what two things
desired signal is presented and recorded signal is a reasonable approximation of physical signal that was present in ear canal
differentiates what
cochlear from retro-cochlear with ABR info
newborn hearing screening
evoked
5 facts
- increases confidence in results
- no ANSI standard
- level of stimulus delivered in canal and measured by mic in probe is used to adjust presentation level
- providers rarely calibrate; input is calibrated at factory
- providers try to detect if errors occur and rule out malfunctions
Non-organic HL because
OAEs don't depend on behavior, normal OAE implies normal sensory function, with frequency specific info
DPOAE info (4 facts)
- two pure tones presented at same time; cochlea generates additional tonal signals at frequencies related to stimulus
- stimulus tone at f1 and f2
- cochlea produces tones at 2f1-f2 (most used)
- more toward apex than stimulus tone
tinnitus
site specific, objectively confirm cochlear dysfunction, frequency specific info which may be associated with frequency region of tinnitus
TE info (2 facts)
- stimuli are very short duration clicks (80 msec) used in combination to cancel out stimulus and leave response
- broadband spectrum
MIHL or NIHL
high sound exposure affects OHC function, site specific, warning sign, objectively confirm cochlear dysfunction (musicians complain of auditory dysfunction)