Unit 3 Flashcards
(101 cards)
Joint Committee on Infant Hearing (JCIH)
has published guidelines for monitoring Universal Newborn Hearing Screenings.
Who performs the test?
Nurses but they actually prefer AuDs and SLPs
Early Hearing Detection and Intervention (EHDI)
1-3-6 Rule
Individuals 3 years and younger identified with HL should be evaluated every 3 months
Recommend that infants with risk factors for HL be reevaluated in 9 months
1-3-6 Rule
Evaluated by 1 month
Diagnosed by 3 months
Intervention by 6
UNHS Protocol
All states have universal newborn hearing screening but protocol
Varies by state
Otoscopy and tympanometry are not required
ABR, OAEs (or both)
-To have ideal specificity and sensitivity, BOTH tests should be performed.
Auditory Brainstem Response (ABR)
Measures brain waves in response to sound
for those that can not responds behaviorally
Any pathologies of the OE or ME can affect ABR
Just a screening
Great objective test for patients who cannot respond behaviorally
Does not assess all necessary frequencies and cannot determine degree of HL
Otoacoustic Emissions (OAEs)
Measure of outer hair cell function
Normal OAEs suggest no worse than a mild HL
Diagnostic protocol: 750-8000 Hz (likely shortened in the hospital)
-OAE screeners likely have a shortened protocol
Greatly objective test for patients who cannot respond behaviorally
Does present OAEs mean the patient has normal hearing?
NO!
Certain configurations of HL
ANSD
Absent auditory nerve
What are Cochlear Implants?
Prosthetic devices that is surgically implanted to electrically stimulate the cochlea
Multiple components
It does NOT restore acoustical hearing (it is now electrical hearing)
cochlear implants are devices that are surgically implanted into the cochlea, activate the auditory nerve, and provide sensitivity to sound.
Components of the CI
Microphone
Speech processor
Transmitter
Electrode array
process of CI
- microphone picks up the sounds from the surrounding environment.
- speech processor changes the sound from the microphone into electrical sound signals and sends them to the transmitter.
- transmitter is held in place with a magnet behind the ear and sends the sounds through the skin to the receiver. This receiver then transmits the signals into electrical impulses and sends them to the electrodes placed within the cochlea.
- These electrodes send the impulses to the nerves in the scala tympani and then to the brain through the auditory nervous system (Battey, 2013).
CI Manuracturers
Advanced Bionics
Cochlear
MED EL
Advanced Bionics
California
Waterproof
MRI compatible
Phonak
Cochlear
Australia
Wireless accessories
ReSound compatible
MED EL
Austria
Single unit processor (Rondo)
(not recommended for children)
CI Evaluation
Will have a HA trial -Must show minimal benefit from hearing aids -Must have a referral Type of evaluations to determine candidacy Determine brand and accessories Surgery Activate CI’s 2-4 weeks later Initial visit Follow-up visits & therapy
initial visit
Activation
Determine baseline
May not UNDERSTAND language
Type of evaluations to determine candidacy
- Medical evaluation
- Physical examination
- Audiometry
- Contra-indications vs. candidacy
- Absolute contraindications
medical evaluation
General health Age of onset of hearing loss Etiology of hearing loss Auditory memory (use of hearing aids, use of oral communication) Duration of deafness
Physical examination
Cochlea present? Surgical planning (Michel’s Aplasia, temporal bone fracture, Otosclerosis, Small IAC, EVA
Absolute contraindications
Ossification of the cochlea Absence of the cochlea and/or auditory nerve Active otitis media Radical mastoidectomy cavity CNS disease that prevenst benefits Medical contraindications for surgery
FDA Audiological Criteria for Adults
Moderate to profound SNHL bilaterally
Patient receives minimal benefit from appropriately fitted amplification
<50% sentence recognition in ear to be implanted (aided)
<60% in contralateral ear and binaurally (aided)
-Medicaid: <40% in aided communication
High motivation and appropriate expectations
Children CI Candidacy (12-24 months)
Profound SNHL
Limited benefit from binaural amplification based on the MAIS/IT-MAIS
Children CI Candidacy (2-17 years)
Severe to profound SNHL bilaterally
Limited benefit from binaural amplification trial
Speech discrimination scores <30%