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18 Cards in this Set

  • Front
  • Back
Causes of HL in infants
5-10%: infection
5-15%: perinatal process
10-20%: assorted postnatal problems
30-50%: genetic
Prenatal Development of Auditory System
8wks: pinna
early: EAC
20wks: cochlea
32wks: ossicles
ANS not all there at birth
Development of Auditory Responses
20wks: FETAL hearing demonstrated
newborn: discriminated F's and I's, rudimentary localizaion
How an Infant may respond to sound
-attempt localization
-Moro's relfex
-change respiration/heart rate
-stop moving
-eye blink, grimace
Newborn Hearing Assessment
-aim to screen out severe HL
-high rish register: family hx, maternal infection, low birthweight, jaundice, meningitis, ototox. meds>5days, APGAR 0-3@ 5 mins, hypotonia >2hrs birth, mech. ventilation >10days, stigmata
Infants 1mos-12mos Testing
-no circumaural phones
-generalized response to sound
-startle response
-OAEs and ABRs (sedated for ABR), VRA/BOA/COR (look at toy when sound presented)
-impedance audiometry
Testing in 1-5 year olds
-important to work quickly, use developmental history
-18mos, pointing test
-24 mos, identify pics
2-3 years: play audiometry
3-5 years: picutre pointing speech Threshold
3+: Nu-Chips, WIPI
impedance audiometry/OAEs/ABRs
-Ling 6 test
Ling 6 Sound Test: what is is, for whom, etc
-for kids with identified HL
-6 phonemes that cover freq. of speech
Details of School Screening Programs
-identify new cases of HL, follow kids with known HL
-school nurse, trained volunteers
-ASHA regulations: test anually from age 3-3rd grade, test 1k/2k/4kHz, 20dBHL=passing
-AC only
Educational Audiology: details
-employed in big cites, schools for deaf
-assess child abilities in classroom, manage/fit listening devices for school
-interpret/translate child HL to teacher
-help design rehab activities (work with SLP)
-educate for HL prevention
Types of Functional HL
Maligering: intenionally faking it. usually fake unilateral

Psychogenic/conversion/hysterical: subconsious, underlying psychological issue
Signs of a Functional HL
-referred by lawyer or insurance company
-very nervous, exaggerate listening behavior, hard time hearing in "all" situations, speak at normal volume but claim severe/profound loss, inconsistant threshold tests, PTA and thresh. very different, BC poorer than AC, no cross hearing, acoutic reflexes present/<15dBabove th., OAEs present when th.>30dBhL
Managing Functional HL
-say results are inconsistant
-document performance, not judgement about faking it
-forensic audiology-may have to testify to results
-tell kids to try harder
-make sure parents are "rewarding" HL
Temporary Threshold Shift
-hearing returns to normal after a few hours
-high F causes more TTS than low F
-level of TTS varies between 8-16 horus of exposure before plateau
Permanent Threshold Shift
-loud enough, long enough sound
-cumulative over lifetime--no plateau
-noise notch notices at 3k or 6k
Music Related HL
-52% Classical musicians get it
-37% rock musicians get it
-related to instrument you play and those around you
Hearing Conservation Programs at work
-must be in place if >85dBA
1. Assessment of Noise Exposure
2. Noise Control
3. Hearing Measurement
4. Hearing Protection
5. Education
Noise Dosimeter
Wearable device to measure average noise exposed to over work shift