Assessment Pure-Tone Bone Conduction Testing

Question Answer
T or F there is not a physiologically useful purpose for bone conduction true
Diagnostically why is BC used to determine the type of loss
is a bone test as precise as air no
what are some limitations of BC middle ear participates, no valid method of specifying bone vibrator output (calibrated on standard head size bone densities differ), difficulties with masking, other equipment and procedural variables
how does bone conduction work excited the cochlear receptors in the same manner as air conduction-the fluid in the inner ear needs to move but it happens from vibration rather than air waves
T or F all bone conduction can be accounted for by a single mechanism False
how does bone conduction set the other bones into movement the ossilator moves the mastoid which then "rattles" the rest of the bones of the skull even after they are sutured together
compression bone conduction is best at which frequencies high frequencies (light bones vibrate faster)
inertial bone conduction is best at which frequencies low frequencies (the ossicular chain in set into a swinging motion) the high frequencies move too fast
what happens when the ossilator is placed on the forehead the swinging motion is lost
can cerumen impaction have an effect on BC yes if there is enough because it may be changed by the occluding or opening of the canal, changing canal resonance, or changing impedance of TM
what is the most common tuning for test, how is it done Weber, TF struck, held to the forehead sound lateralize. If it is in the bad ear its conductive if it is in the better ear its SN. If no conductive component it lateralize to the better cochlea or will only be felt. Goes to greater conductive component
How does the Bing TF test work TF is placed on the mastoid and ear is occluded. If it gets louder there is normal hearing or SN loss if sound does not get louder there is a conductive loss
how does the Rinne TF test work strike fork and place by ear, when no longer heard place on mastoid right away. If sound comes back it suggest BC is better and loss is conductive if sound does not come back loss is SN
on occasion TF tests are still used today, why used to differentiate SN from conductive
BC thresholds are thought to be a measure of what and air conduction is thought to be a measure of what inner ear/SN system (cochlear reserve), entire system
T or F BC thresholds are independent of the middle ear system False, the middle ear is still impacted
how can the middle ear impact BC stapes fixation due to radical mastoidectomy, elevated BC after removal of middle ear structures or tympanic membrane immobilization, occlusion effect, otitis media (BC may bet better after infection is gone)
T or F bone conduction can appear worse than it really is due to scar tissue because of inertia true
T or F Bone conduction can be considered a true test of cochlear reserve since it is the best that we have false, it is the best that we have but we must also be cautious of other characteristics
what are the two places an oscillator may be placed mastoid or forehead
advantages and disadvantages of frontal placement A) better test retest reliability, reduction of middle ear participation, easier to place D)reduced sensitivity compared to mastoid
advantages and disadvantages of mastoid placement A) audiometers calibrated for mastoid, larger dynamic range D) mastoid has more movement so more variability (middle ear moves)
T or F BC has smaller dynamic ranger true
T or F the oscillator always tests the cochlea on the side of the oscillator false, it always tests the best cochlea
T or F the bone-conduction is not a measure of pure cochlear reserve but is influenced by status of external and middle ear true
T of F physiologically BC can be worse than AC false
what kind of testing should always be done with BC immittance testing (middle ear testing)
what is the order of frequencies test for BC 1k, 2k, 3k, 4k, 500, 250
what is the frequency that was added and what should we be aware of with testing 250 3k was added, must be aware of 250 because it could be tactile
why can 6k and 8k not be tested with BC the machine can not vibrate that fast
if there is a conductive loss what does the AC and BC show AC abnormal, BC normal
if there is SN loss what does AC and BC show both air and bone are abnormal and are roughly equal
if there is a mixed loss what does AC and BC show both are abnormal but bone will be better than air (air bone gap)
if the bone is abnormal but it is still better than air what is being shown air bone gap
if there is a T on an audiogram what does it mean tactile response
when there is a notch on an audiogram what does it mean there is always a SNHL
what does the arrow off of the symbol on the audiogram mean no response at the limits of the audiometer and you can assume a SNHL
what is the leading cause of SNHL mumps

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