Test 2 Flashcards
If PTA and SRT are not within +/- 10 db you can suspect problems with…
Test procedure
test equipment and calibration
functional hearing loss
What is the purpose of speech reception threshold?
to validate puretone thresholds at 500, 1000, and 2000hz (PTA)
baseline for speech discrimination test
hearing aid evaluation for gain prescription
What is the starting intensity level for speech reception thershold? and what is the presentation mode?
30db above the puretone average for each ear
Then go down 10db (until NR) and up 5 db
Presentation mode - live voice
What is the purpose of Speech Discrimination testing?
determine extend of SD ability
determine site of ear pathology
determine candidacy for hearing aid amplification
determine prognosis for Aural rehabilitation
What is the SD testing procedure?
Initial Intensity Level - 30 db above SRT in each ear
Number of words - 25
Open word lists - CID W-22 or NU-6 (Adu), PB-K
SD% = # correct x 4
0-59%: Very poor
Sensori-neural (Neural/8th nerve)
Conventional SD testing extensions
SD at higher intensities
SD in noise (ex. SPIN test) speech perception in noise
SD using synthetic sentences (ex. SSI test) Synthetic sentence identification test
SD using high-frequency stimuli (ex. CCT) California Consonant Test
What is the function of PI-PB?
measuring performance (SD) at different intensity levels using PB words (CID W-22 or NU-6)
90-100%: Excellent
Normal/Conductive hearing loss
What are the intensities normally used for PI-PB?
30 db above SRT (30db SL)
45 db above SRT (45db SL)
60 db above SRT (60db SL)
For conductive and cochlear hearing loss, PI-PB performance gets _____ as intensity increases?
better
What is the speech material used in speech reception threshold?
CID W-1 (two syllabic words/spondees with equal stress)
What does sensation level (SL) mean?
level of sound above threshold
What is speech reception threshold?
the lowest level an individual can identify spondees 50% of the time (2/4, 3/4) or three repeated responses
In ROR, what figure is consistent with neural lesion?
0.4 or greater
In ROR, what figure is consistent with normal or conductive hearing loss or cochlear lesion?
0.4 or less
What is the purpose of Immittance audiometry?
to directly evaluate the middle ear status
to indirectly evaluate the inner ear status
What is happening in the Probe ear (test ear) during Immittance audiometry?
probe tone frequency: 220 Hz or 660Hz (which must be done with new born babies to get reliable tympanograms)
Probe tone intensity: 85 db spl in the ear canal
Type B
Abnormally low compliance
peak compliance - absent
consistent with middle ear fluid build-up
Type As
Limited peak compliance around 0 to -100 mm air pressure; less than 0.3 ml
consistent with otosclerosis - stapedial bone fixation - fixed to the oval window
What tests are used in Immittance audiometry to directly assess the middle ear?
Tympanometry
stapedial reflex threshold
Type C
Normal peak compliance beyond -100 mm air pressure
consistent with Eustachian tube malfunction (plugged up)
What are the advantages of Immittance audiometry?
The tests are objective so they are replicable and require less patient cooperation
determine the cause for conductive hearing loss
determine functional integrity of the inner ear - indirectly
How do you determine PI-PB roller over ratio?
PBmax - PBmin / PBmaz = ROR%
