Hearing Aid Dispenser Written Exam Questions and Answers (Graded A)
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Hearing aid dispenser
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Hearing Aid Dispenser
Hearing Aid Dispenser Written Exam Questions and Answers (Graded A)Hearing Aid Dispenser Written Exam Questions and Answers (Graded A)Hearing Aid Dispenser Written Exam Questions and Answers (Graded A)Hearing Aid Dispenser Written Exam Questions and Answers (Graded A)db loss of a perforation of TM ...
Hearing Aid Dispenser Written Exam
Questions and Answers (Graded A)
db loss of a perforation of TM - ANSWER - 10-15db loss
procedure done to fix perforation - ANSWER - tympanoplasty or myringoplasty
monomeric spots - ANSWER - looks like a hole in TM, but reflects light like a mirror. holes that
have healed. aka "mirror membranes"
average dimentions of an adult eardrum - ANSWER - 2.3-2.9cm in length, .7cm in diameters
pars tensa - ANSWER - lower 4/5 of TM and tight
pars flaccida - ANSWER - upper 1/5 of TM and flaccid
otis externa - ANSWER - "swimmers ear" - inflammation of the walls of the EAM. will not cause
loss unless swelling blocks canal. treat: warm salt water, drying it, topical antibiotics
polyps - ANSWER - masses of tissue that grow outward from a surface
cholesteatoma - ANSWER - non-cancerous tumor in the middle ear. oderous discharge.
sometimes perforates upper TM. invasions of skin into the middle ear - sac of concentric rings of
protein. causes conductive loss. most dangerous pathology.
epitympanic cavity - ANSWER - attic of middle ear. allows air into mastoid cells of temporal
bone. branches several nerves
incudotapedial junction - ANSWER - top of incus to head of stapes
,annular ligament - ANSWER - footplate of stapes that is held in the oval window
enlarged canal - ANSWER - result of ear surgery. often have no ear drum or ossicular chain.
need approval of physician before fitting
tympanosclerosis - ANSWER - white, chalky calcium deposits caused by degeneration of tissue
on eardrum, thicking and scarring from peforations and infections
acoustic reflex - ANSWER - tensor tympani (muscle on malleus) and the stapedius muscle
contract to prevent damaging intensities of loud sounds
otitis media aka OM - ANSWER - fluid in middle ear space, most common, fluid can be infected
non-supportive OM - ANSWER - w/ no infection
suppurative OM -3 classifications - ANSWER - 1. acute - more severe w/ short duration and
onset. 2. chronic - recurring infection. 3. adhesive - fluid becomes thick and sticky
procedure to treat OM - ANSWER - PE tube
speed of sound - ANSWER - 700mph or 340 m/s (4x as fast through water, 14x as fast through
steel)
reflection - ANSWER - is an echo or a reverberation
reverberation - ANSWER - often in a small room, 17m or less, reverbs can mask high
frequencies
echo - ANSWER - heard and perceived later than original sound (more than 1/10s after)
, absorption - ANSWER - aborbs sound. can improve environments w/ reflection or reverb. better
in warmth and moist
diffraction - ANSWER - sharpness in the change in direction of sound, bending. high
diffraction=bigger wavelengths (low freq)
refraction - ANSWER - sound passes through one medium to another, change in speed and
wavelength
infrasound - ANSWER - below audible range of 20 Hz
ultrasound - ANSWER - above audible range of 20K Hz
octave - ANSWER - anytime the frequency doubles. f(2) = on octave; f(3)= two octaves
faintest sound a human can hear - ANSWER - 10 ^ -16 watts/cm^2 and pressure of .0002
dynes/cm^2
threshold of pain - ANSWER - 1000 dynes/cm^2
when SPL levels double how many db levels increase? - ANSWER - 6 db
db HL expresses: - ANSWER - threshold levels
db SPL expresses: - ANSWER - voices or environmental sounds
pinna function: - ANSWER - gather sound, aid in localization, enahnce high freq bw 2k-5k hz
aperture - ANSWER - entrance to canal, first bend
isthmus - ANSWER - narrowing of canal
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