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32 Multiple choice questions

  1. peak b/w +50 to -150, compliance w/in normal range
  2. -Probe tone generator: creates a standard ongoing sound (typically, 226 Hz at a standard level and always there)

    -Signal generator: creates other signals, like pure-tones for acoustic reflexes

    -Pressure pump: changes pressure in the EC
  3. as it moves it makes the ossicles move; move sound from the TM to the oval window
  4. air pockets and is continuous into the ME, impacts the pressure as well
  5. -Adult: .6 - 1.5 ml

    -Child: .4 - 1.0 ml

    -Type B: With normal volume: suggests poor mvmt of the TM or poor ME function
  6. lets fresh air into air, equalizes ME space
  7. -Half the height of the tympanogram on both sides, and look at the width b/w the two points

    -Adult: 40-110 daPa

    -Child: 60-150 daPa
  8. -Probe tone: has the ongoing 226 Hz tone coming out of it; doing the MEASURING

    -Pressure: measures pressure

    -Mic: measures the bounce back
  9. +50 to -150 daPa

    -B/w -100 to -150 it may still cause a conductive loss

    -Low: > -150 = Type C, suggests they have negative pressure (ET tube isn't opening and letting air in)

    -High: > +50 = suggests positive pressure
  10. -We want to know how well the TM moves

    -We can measure in a theoretic manner

    -EX: The TM is complaint, meaning there isn't much impedance

    -We do this by using equivalent volumes
  11. -peak > -150

    -Suggests they have negative pressure (ET tube isn't opening and letting air in)
  12. -FIRST, perform Otoscopy

    -Hermetic seal: get a good seal; pick the correct sized tip so there isn't a leak

    -+200 daPa: read what the equivalent volume coming back

    -Volume in ml (actual volume) will give you a REAL volume of the EC
  13. -Probe tone

    -Pressure varied

    -Reflected sound

    -Mic measures

    -Compare baseline

    -Plot results
  14. -compliance < .3 (adults) or .2 (child) = shallow; normal peak

    - Suggests stiffness of the ME system
  15. no peak: suggests poor mvmt of the TM or poor ME function (w/ normal vol.)
  16. 1. Otoscopy

    2. Hermetic seal

    3. +200 daPa vary in 50 daPa steps (when equal you will get the max compliance)

    4. Compare to baseline

    5. Compare results
  17. -compliance < .3 (adults) or .2 (child) = shallow; normal peak

    - Suggests stiffness of the ME system
  18. There will be some component that is a conductive component, but regular tymp. didn't catch it
  19. -when we hear a loud sound the muscles will pull back and tense up the muscles to protect the ossicles, prevent the sound from traveling (e.g., tensor tympani, stapedius)
  20. -Imaginary, not real volumes

    -A theoretic volume that we are estimating that gives us a volume

    -We put a sound in and measure how much comes back

    -What does not bounce back is the same sound in a bigger "room" if there is a hole or perf.

    -What bounces back is the equivalent volume
  21. enhance sound from air to sound, impendence mismatch transformer, sensitive to change
  22. -TM

    -Ossicles

    -ET

    -Mastoid

    -Muscles
  23. -For sound to travel it's best, will take more effort to move fluid than air

    -Without equal pressure, or fluid in the ME will make it harder for the sound to go through

    -The ET helps equalize, so the ossicles can enhance (boost) the sound.
  24. Suggests a perforation of the TM or PE tubes
  25. strictly a conductive disorder
  26. -Adult: > .6 ml

    -Child: > .4 ml

    Type B: with small vol. suggests obstruction of the EC wax or blockage
  27. Suggests obstruction of the EAC, wax/blockage
  28. conductive disorder
  29. Dictates the loudness
  30. -Adult: < 1.5 ml

    -Child: < 1.0 ml

    -Type B: with large vol. suggest a perforation or PE tube in TM
  31. -Tympanometry

    -Change Probe Frequency

    -Look for notching: called 3Ys or notched A for type, if a tympanogram had a notch, comes back up

    -Has a peak and we need to test with a different probe Hz than 260 Hz,

    -Do it again, to make sure it's there. Then repeat at different freq.
  32. peak - base = compliance (use this formula if the base is not at 0)

    -Adults: .3 - 1.4 ml

    -Child: .2 - .9 ml