unit 1 Flashcards
aural rehabilitation (AR)
seeks to restore a person’s ability to communicate (re-teaching)
aural habilitation
seeks to establish or improve a child’s ability to communicate (cannot re-teach what they never had)
what is the AR plan?
assessment, informational counseling, develop a plan, implementation, outcome assessment, and follow up
what are the two models for AR?
evaluation (activity limitations/restrictions, audiologic status, and life factors) AND intervention (AR strategy, listening devices, other services, and outcome assessment
goals of AR
minimize, alleviate hearing related difficulties ; improves conversational fluency, improved feeling of self-concept, better quality of life
disabiling hearing loss
there is a loss of function imposed by hearing loss and denotes a multidimensional which many include pain or discomfort (only about 30% of adults will do something about their hearing loss)
what does ICF stand for
international classification of functioning, disability and health
ICF framework
body structure, activity, body functions, participation, environmental factors, activity limitations, personal factors, participation limitation
impact of hearing loss on family members
“third party disabilities” in their own lives
why is AR needed for infants and toddlers
early identification, and prevention of speech and language delays
why is AR needed for school age children
academics and communication with peer groups are high priorities
-educational planning, accommodation in the classroom with assistive technology. and support in transition
why is AR needed for adults
adults can continue to make contributions in workplace and communities
why is AR needed for older persons
many want to continue career or desires to communicate with friends and family
-with health advances, hearing loss is the only thing holding them back
evidence based practice
clinical decisions for patient care should be based on :
-clinical expertise
-patient values
-best research evidence (real ear measurements)
-not “this is what we’ve always done”
what does PICO stand for
patient intervention comparison outcome
prelingual
HL acquired before acquisition of spoken language
perilingual
HL during acquisition of spoken language
postlingual
HL after acquisition of spoken language
congential
HL present at birth
acquired
HL from prevocational, early working age, later working age, retirement age
progressive hearing loss
occurs over the course of several months
sudden hearing loss
individual loses hearing suddenly, possibly due to an injury
speech clarity
dominated by high frequency volumes (CONSONANTS)
speech volume
dominated by low frequency volumes (VOWELS)
what conveys the most word information
consonants - therefore more important for speech intelligibility
speech perception testing
determine need for amplification, compare performance with and without listening device, compare different listening devices, determine needs for AT/placement in training program/expected benefit
speech recognition tests
assesses how well someone understands, often referred to as word recognition scores
-sound segregation and sound localization
speech awareness threshold/speech detection threshold (SAT/SDT)
the lowest level that the patient can just detect the presence of speech 50% of the time
-spondee words
-should be within 5-10 dB HL of pure tone threshold
speech recognition threshold (SRT)
lowest level at which the patient can perceive words with 50% accuracy (repeat the words back)
-spondee words
-should be within 6-12 dB of pure tone average
word recognition scores (WRS)
pure tone thresholds determine degree and type of hearing loss
-used to find a reduction in clarity
most comfortable level (MCL)
level that is most comfortable for the listener
uncomfortable loudness level (UCL)
intensity at which speech becomes uncomfortably loud
dynamic range (DR)
difference between the softest level that words can be understood and the level where speech starts to be uncomfortable
signal to noise ratio (SNR)
difference between the level of the signal and the level of noise
signal - noise = SNR
basic components of hearing aid
microphone, amplifier, receiver, battery, body of hearing aid, wax protector, telecoil, and program switch
omnidirectional microphone (omni)
sensitive to sound coming from all directions
directional microphone
more sensitive to sound originating on front of the user than to sound coming from behind the user (fixed vs. automatic vs. adaptive)
fixed directional microphone
picking up sound from the specific area
automatic directional microphone
switch in and out of directionally automatically (condenses into one area based on hearing background noise)
adaptive directional microphone
will change the direction of the way it is pointing (moves where speech is)
amplifier
gain = output - input
-how much sound comes out of the hearing aid
linear gain
one to one
compression
a nonlinear forms of amplifiers gain used to determine and limit output gains as a function of input gain
gain regulation
limit output of HA without distortion, minimize loudness discomfort, prevent further damage, restore normal perception, maintain listening comfort, reduce adverse effects of noise, provide varying amount of gain as a function of input level
recievers
like a speaker (pumps out the sound)
-low power = low HL
-high power = high HL
what do we fit domes based on
fitting based on acoustics
function of dome
are put on ends of receivers to fit in the ear (come in packs)
holes on domes - allows sound to go in normally
full domes - restrict all bass and sound from coming in
function of earmold
will help seal off the ear so leaking of sound (whistling) will not occur
-used for higher hearing loss patients since they need more sound output
what do we use to fit a earmold
patients hearing loss
how do we determine a dome or earmold
case by case
-look at hearing loss
-if they have a latex allergy
-if they have other situations that prevent from putting domes in
how to determine the style of hearing aids
based on the anatomy, hearing loss level, and what the patient wants
in the ear hearing instruments (ITE)
custom made
completely in the canal, in the canal, and in the ear
behind the ear hearing instruments (BTE)
behind the ear and receiver in the canal
completely in the canal (CIC)
-fits deeply inside the ear canal
-for mild to moderate losses
-reduces feedback and improves sound localization
-virtually invisible
in the canal (ITC)
-small enough to fit almost entirely in canal
-generally for mild to moderately sever losses
-easy for patients with arthritis
in the ear (ITE)
-fits in external ear
-generally for mild to severe losses
-similar to ITC, but a little bigger
behind the ear (BTE)
-fits snugly behind the ear and is attached to a custom earpiece
-for mild to profound hearing loss
-fewer problems with feedback and easy maintenance
receiver in the canal (RIC) or receiver in the ear (RITE)
-smallest BTE style
-for mild to profound hearing loss
-comprised of a smaller body that sits behind the ear with receiver in the ear
-most popular style
levels of hearing aid technologies
basic, essential, advanced, and premium
other features of a hearing aid
on/off control, direct audio input (DAI), wireless capability, telecoil, volume control, remote control (now used alongside an app). memories and programs, fall detection, and some waterproof models are coming out
one hearing aid vs. two hearing aids
-localization is impacted (need information from both ears to learn where sound is coming from)
-listening in noise (we use two ears to separate sound in noise ; if only using on, it can overwhelm the ear)
-loudness summation (two input levels of same frequency in the same ear will give it the same boost)
contralateral routing of signal (CROS)
sound will be transferred from bad side to the good side
-normal hearing in one ear and no hearing in the other ear
bilateral contralateral routing of signal (BiCROS)
amplifies the loss in the better of the two sides plus transferring noise from the worse side to the better side
-impaired hearing in one ear and no hearing in the other ear
limitations of hearing aids
only makes sound louder, cannot bypass the site of lesion, cannot selectively amplify speech versus noise, and other devices may be needed for warning sounds and alarms