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CD 443 Exam 3 – Questions & Complete Answers (Rated A+)
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CD 443 Exam 3 – Questions & Complete Answers (Rated A+)
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CD 443 Exam 3 – Questions & Complete Answers(Rated A+)
Review: Sensorineural Hearing Loss? Right Ans - AC threshold shows a loss
BC threshold shows a loss
NO AIR-BONE GAP
Review: Conductive Hearing Loss? Right Ans - AC threshold shows a loss
BC threshold is normal
Significant air-bon gap >10 dB
Review: Mixed Hearing Loss? Right Ans - AC threshold shows a loss
BC threshold shows a loss
Significant air-bone gap >10 dB
Review: SRT? & SDT? Right Ans - SDT: The lowest level at which the patient
can just DETECT speech 50% of the time.
SRT: The lowest level at which the patient can barely UNDERSTAND speech
50% of the time.
Review: Word Recognition? Right Ans - -Suprathreshold Test
-40 dB above SRT is used as the presentation level for discrimination testing
(40 dB SL)
-Haring loss in normal limits should not have any trouble
-Conductive hearing loss: problems with loudness
-Sensorineural or Mixed hearing loss: problems with loudness and clearness
What are the two types of hearing tests? Right Ans - Behavioral Test
- Require the patient's active cooperation and a behavioral response
Objective Test
- Requires some cooperation but no behavioral response
What is tympanometry? Right Ans - -Test of tympanic membrane
movement
-Test of Eustachian tube function
-Best measure available for detecting otitis media
, Tympanometry can be affected by what findings of an otoscopy? Right Ans
- Ear drum perforation
Occluding wax, Foreign bodies, Malformed ear canal
Tympanometry is? Right Ans - measuring how sound is transmitted
through the middle ear (indirectly) we can evaluate the functional properties
of the middle ear
Tympanometry is NOT ... Right Ans - A hearing test
But it can..
• ...help identify middle ear conditions that can cause hearing loss
• ...help distinguish between sensorineural and conductive causes
• ...be a very reliable test for detecting otitis media (middle ear fluid)
With a Tympanometry depending on your device you are using you can
measure? Right Ans - Admittance or impedance
Most equipment measures admittance
What is admittance? What is impedance? Right Ans - Admittance-
opposition to energy transmission
Impedance- ease with which energy is transmitted
The probe in the Tympanometry has three tubes connected it to... Right
Ans - 1. Loudspeaker- Plays a probe tone - usually 226 Hz at 85 or 90 dB SPL
2. Microphone- Measures the intensity level in the ear canal
3. Air pump- Changes air pressure in the ear canal, Can create either positive
or negative air pressure within the ear canal, Calibrated in milliliters (ml),
millimeters of water (mm H20), or dekapascals (daPa)
How does tympanometry work? Right Ans - 1. A 226 Hz tone at 85 or 90 dB
SPL is emitted from one tube (probe tone)
2. While probe time is present a + to - air pressure sweep is introduced from
another tube into the canal
3. The reflected signal is picked up by the 3rd tube
4. The tympanogram records the amount of ear drum movement (compliance)
as air pressure changes by analyzing the amount of probe tone that was
reflected
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