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ComD 438 Exam 2
Transcript of ComD 438 Exam 2
Print out your tympanometry results
Understand pressure, compliance, otoscopy, types of tympanograms Tympanogram Type A Type B Type C Type As Type Ad Otoscopy and other observations:
Purpose of otoscopy is to inspect the ear canal for blockage and the TM for any obvious abnormalities
Why do we put pressure on the external ear canal? dd What we know:
Type A: considered normal
Type B: abnormal (OM)
Type C: abnormal (negative ME pressure)
Type As: abnormal (otosclerosis)
Type Ad: abnormal (ossicular discontinuity) Some tympanometry basics
Components of a clinical immittance device (there are six): pressure pump, manometer, microphone, sound level meter, tone generator speaker, and probe tip (to insert into the ear canal)
Immittance of the ear is derived from the stiffness, mass, and resistance components of the ear
Ear is largely a stiffness dominated system with bias to the low frequencies More on tympanometry
What is compliance?
What is compliance measured in?
Pressure range should be from -400 daPa to +200 daPa
What IS tympanometry, anyway?
Admittance = compliance, for the purposes of this class
Admittance of the TM is highest when the pressure in the ME is equal to the pressure in the ear canal
Does tympanometry measure hearing threshold? What you need to know about SRT and WRS:
A LOT Speech recognition threshold testing assesses the patient's intelligibility for speech
What does phonetic balance mean?
What are the clinical functions of the speech recognition threshold?
Range of normal speech recognition scores for individuals with normal hearing is 90% to 100% (think of WRS here) A little bit about SRT
It's defined as the lowest level at which speech may be recognized 50% of the time
Bisyllabic spondee words
Closed set word lists
Preferred method of presentation: recorded or live voice? How to find the SRT (5 dB method):
If initial level isn't heard by patient, increase presentation level by 20 dB until a word is heard
Initial starting level: 10 dB higher than level at which 2 consecutive words were missed on the descending trial
Understand what to do from here (descending trials, final value, correction factor, etc) SRT 2 dB method:
Understand how this differs from the 5 dB method Be familiar with the masking equations: how do we determine the need to mask? Word Recognition Scores (WRS):
Open set word lists
Reasonably familiar words
What is the unit of measure? More on the WRS:
Presentation level is obtained how many dB above the SRT?
% correct is recorded on the audiogram Some good-to-know abbreviations:
MCL = most comfortable loudness level
UCL = uncomfortable loudness level (descending or ascending technique?)
RCL = range of comfortable listening, or dynamic range of hearing (range in dB from SRT to UCL) What is recruitment?
An abnormal increase in loudness per unit increase in intensity
Presence of recruitment reflects cochlear loss Good luck studying! You'll do great!