Final Exam Flashcards
If setting up Stenger test, PT R thres is at 5 and L thres is at 45 at 2,000 Hz. How would you set the tone for L ear? How would you set tone for the right ear?
L: 35 (10-45)
R: 15 (5+10)
if the patient says they DID NOT hear the tone for the above example, were they likely faking?
yes
In the example above, if the patient reports that they DID NOT hear the tone, in which ear did they likely hear it in?
left ear
If you determined that the person was presenting with a nonorganic hearing loss and wanted to estimate a pure tone threshold at 2000 Hz, how would you set that up?
R ear: 15
L ear: 0
When using Stenger principals to estimate threshold, would you expect the patient to report that they DO or DO NOT hear the tone at your initial presentation?
they would say they do hear it at the first presentation
If the hearing loss at the the left ear were nonorganic and the hearing was actually symmetrical based on the right ear thresholds, would the patient be able to hear a 40 dB tone presented to the left ear?
yes
How would you set up a Stenger at 1000 Hz for PT with L thres at 0 and R thres at 45?
L ear: 10
R ear: 35
Assume the patient in the above case is giving you valid responses. Would this result in a negative Stenger or a positive Stenger?
negative stenger
If the patient in the previous case is giving you valid responses, in which ear would they have heard the tone during a Stenger test?
left ear
contra’s missing, ispi present, no HL
brainstem pathology
probe side absent, normal tymps, normal hearing, descending pathway
facial nerve pathology
conductive loss on audiogram (ABGs, Low frequ HL), normal tymps & reflexes
SSCD
bilateral, no reflexes on both sides
normal OAE, hearing below 60dB, BILATERAL, rare are stim effect, thresh varies, is retro, has to occur w/ SNHL
ANSD
thresholds normal & reflexes bw 70-90 SL
normal hearing
HL in one ear, same side probes - abs
stim - 70-90 ABOVE air thresholds (elevated)
conductive
SNHL, STIM ear reflexes affected, <70 dB SL, stim effect, generally expect reflex up to 60dB cochlear hearing, if AC thres >60 dB absent reflexes are not diagnostic
cochlear HL
SNHL/NH, STIM ear, >90dB SL/ABS
retrocochlear/vestibular schwanoma
what is sensitivity
correctly identifying those with the disease
TP/TP+FN
Number of true positives / total number who have it
what is specificity
correctly identifying those without the disease
TN/FP+TN
Number of true negatives / total number who do not have it
Is standard low frequency tympanometry good at differentiating between otosclerosis and a normal middle ear?
no because you can have a normal tymp with otosclerosis
What is a primary factor that influences sensitivity and specificity for a specific test?
how you set the screening criteria
Is high frequency audiometry more sensitive for detecting damage to the as?
could be, need more research
common use for high frequency audiometry
monitoring ototoxicity
What transducer type must be used for high frequency audiometry?
circumaural headphones
what is acoustic reflex decay
based on reflex adaptation
presented 10dB above reflex threshold
unimpaired system can hold this for longer than 10 seconds
retrocochlear pathology adapts and decays
+ decay
retrocochlear pathology sign
did not hold for the full 10 seconds
- decay
not indicative of retrocochlear pathology
holds for the full 10 seconds
difference between baseline admittance and admittance at the reflex
50%
How is a test for acoustic reflex decay administered?
Present 10 dB above reflex threshold (without exceeding 105 dB) for ten seconds
Note whether reflex is maintained for the ten seconds or if it decays
If reflex decays by 50% or more, this is considered “positive” for reflex decay and is an abnormal finding
Suggestive of retrocochlear
Decay less than 50% = negative for reflex decay
what is considered a + decay
If reflex decays by 50% or more
retrocochlear
what is considered a - decay
Decay less than 50%
what is the ideal condition for acoustic reflex decay
CONTRALATERAL
if cannot, ipsi is ok
only present at 500 or 1000 Hz
Why are you not likely to actually measure positive reflex decay even in cases of retrocochlear pathology?
Typically we have no response with retrocochlear (reflex threshold) so we won’t do it on them because it is too loud
Cochlear - can do it on them and could rule out retrocochlear this way
What are some indications that a hearing loss might be nonorganic?
Exaggerates difficulty hearing
Case history
Financial compensation (work injury, for example)
Referred by an attorney
Difficulty in school (pediatric)
Age (most common age for pediatric functional hearing loss is10-12 years old)
Based on observable discrepancies
Between behavior and test results
Among audiology test results
what is nonorganic
faking a HL
apparent hearing deficit in absence of an anatomic or physiologic explanation
What dB of difference between ears is needed to do a Stenger?
20 dB