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22 Cards in this Set

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Responsibilities and Job Function

Evaluations for adults and children


Fitting hearing aids and FM devices


Cochlear Implant mapping


Neonatal Hearing screens


Hearing Loss prevention


Inter operative monitoring


balance testing and therapy


educational and university setting


OSHA


consultant/industry

Types of Hearing Loss

1.) Hearing sensitivity- a reduction in the sensitivity of the auditory mechanism so that sounds need to be louder than normal for listener to perceive.




2.) Auditory Nervous System Disorder- may or may not include hearing sensitivity loss, but often results in reduced ability to hear suprathreshold sounds properly.




3.) Functional Hearing Loss- exaggeration or fabrication of hearing loss

Threshold Vs. Suprathreshold

Threshold measures try to find the lowest level at which a person can hear/understand speech.




Suprathreshold seeks to determine how well a person understands what is heard, once it has been made audible.

Hearing Loss Types

1.) Conductive- outter and middle ear; bone conduction WNL, air-bone gap significant




2. Sensorineural- cochlear, retrocochlear; bone conduction loss, air-bone gap not significant




3.) Mixed- air conduction loss; bone conduction loss, air-bone gap significant

Deaf Vs. deaf

(Captial D) refers to a cultural group




(lowercase d) is defined by an audiogram

Types of hearing aids

Body


Behind the ear


In the ear


In the canal


Completely in the canal

Parts of hearing Aids

All hearing aids have:


microphone


power source


receiver




Optional Parts:


telecoil


tone control


ear mode

Cochlear Implants

The functional replacement of the ear




Parts:


microphone


speech processor


external receiver


internal electrode array

Assistive listening devices

Sound enhancement technology:


hard wired systems


infrared systems


loop induction systems


FM systems


bluetooth




Telephone enhancement Systems


television enhancement systems


signal alerting devices

What allow things to vibrate?

Elasticity and Inertia

Normal frequency for humans to hear

20-20,000 Hz

Speech frequencies

125-8,000 Hz

Retrocochlear

display disproportionately low word recognition in comparison to pure tones, worst type of HL for word recognition, acoustic neuroma

Carhart's notch

dip in audiogram at 2000 Hz due to stapes fixation

Pseudohypacusis

faking a hearing loss

Speech recognition/reception threshold

part of speech audiometry, uses spondee words (equal stress, cowboy)

OAE

measures function of outer hair cells, absence of response suggests issues with the inner ear.

ABR

abnormal response implies auditory neuropathy (retrocochlear problem)

Acoustic reflex delay

reduced suggests retrocochlear problem, positive suggests possible acoustic tumor

Tympanogram

graphical plot showing eardrum compliance at different values of air pressure

Tympanogram Types

A: normal




As: shallow compliance(otosclerosis, ear infection)




Ad: deep compliance (ossicular disarticulation)




C: negative pressure (eustacian tube dysfunction)




B: flat- no pressure or complaince

Degree of hearing loss

Normal -10-15- hears all speech sounds




Slight 16-25 - may miss some consonants




Mild 26-40 may miss some speech sounds




Mod 41-55 will miss most speech at normal level




Mod severe 56-70 will not hear any speech at normal




Severe 71-90 will not hear any speech and almost any other sounds




Profound 91+ will not hear any speech and probably only very loud sounds