Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
10.AUD-Acst Immit
Audiology SLP314
| Term | Definition |
|---|---|
| Tympanometry intro | Assesses what we cannot see: health of middle ear. Provides pathology clues. No participation required. |
| Tympanometry intro (cont) | Does not provide us with any information regarding the hearing status. Only assesses the possible physical abnormalities of the outer and/or middle ear. Helps us distinguish between a conductive and sensorineural hearing loss. |
| Impedance | opposition to flow of acoustic energy |
| Admittance | relative ease with which energy flows through the system |
| Immitance | refers to either impedance or admittance. Measures condition of TM and middle ear |
| Immitance testing (2) | Tympanometry. Acoustic reflex. |
| Tympanometry components (3) | 1. Puretone generator 2. Microphone (measures) 3. Air pump (neg/pos pressure) |
| Tympanometry defined | measurement of the mobility of the middle ear when air pressure in the external canal is varied from +200 to −400 daPa. |
| Tympanogram | x-axis, air pressure daPa. y-axis, immitance ml (compliance/mobility). |
| Patient preparation | 1.No talking, chewing, moving excessively (be still). 2. Pull the ear up and back. 3.Place probe in the opening of the ear canal (appropriate seal) 4.Use distraction techniques with children |
| 5 results of tympanometry | 1. Type A (normal) 2. Type B - flat (no movement). 3. Type C - Negative peak (ET dysfunction, before/after otitis). 4.Deep A / Ad (disarticulated ossicles, poor heeling of TM) 5. Shallow A / As (fluid in ME or stuck stapes) |
| Interpretation of tympanometry | 1. Location of peak along pressure axis 2. Max compliance (height of peak). 3. Ear canal volume (ECV) |
| Pressure peak norm | -150 to +40 daPa |
| Max compliance norms | 0.2 - 2.0 ml |
| Ear canal volume (ECV) | Volume from probe tip to TM. Child - 0.3 to 1.0 ml. Adult - 0.65 to 1.75 ml. Excessive vol: perforation or PET. Excessively small vol: wax plug or probe against canal. |
| Type A tympanogram | Probably normal ME/TM function |
| Type As | -Abnormal, reduced compliance -Early otosclerosis, tympanosclerosis |
| Type Ad | -Abnormal, increased compliance. -Ossicular disarticulation, interruption. TM flaccidity (healed perforation-middle layer doesn't heal) |
| Type B | -Abnormal pressure and compliance. -Extreme stiffness of TM and ME (ME effusion, advanced otosclerosis, impacted cerumen) -use ear canal vol to discriminate |
| Type C | -Abnormal, negative ME pressure (normal compliance). -Eustacian tube dysfunction, early or resolving OM |
| Uses of tympanometry | 1.Determine cause of conductive loss. 2.BC can't be tested (kids) 3.Otitis media monitoring |
| Ear Canal Volumes for Type B | Normal ECV: Extreme stiffness, otosclerosis. Low ECV: impacted cerumen. High ECV: perforated TM |
| Acoustic reflex | Involuntary contractions of the middle ear muscles that occur in response to high intensity sound. Depends on hearing status |
| Acoustic reflex threshold | Lowest intensity needed to elicit a contraction of ME muscles. Typically 65 - 95dB HL. Triggers both ears (ipsilateral). |
| Acoustic reflex testing | Present sound. Observe. Increase by 5dB. Repeat at 0.5, 1, 2, 4 kHz ipsi- and contralaterally. |
Created by:
ashea01
Popular Speech Therapy sets