tympanometry Flashcards
(17 cards)
immitence
how energy flows in the system
admittance
ease of how energy flows in system
impedance
opposition of flow of energy
tympanometry
evaluates function/mobility of middle ear, info about middle ear pressure, fluid in middle ear
tympammetry parameters
maximum admittance (Mmho or mL)
pressure at maximum admittance (daPa)
ear canal volume (cubic centimeter)
equal pressure same on both sides =
high admittance
tympanometer aka immitence device
it works by changing pressure in ear canal and measures admittance
healthy middle ear
equal atmospheric pressure
unhealthy middle ear
atmospheric pressure on one side, negative pressure on the other
tympanometry run down
place tip in ear canal so that it can create a closed off tight seal
play tone at 85 dB SPL @ 226 HZ
tone is sent into ear canal is pressure is being changed “negative to positive pressure)
measuring mic will monitor the amount of sound in ear canal that is reflected back from tympanic membrane
Jerger type A
peak- present and occurs around 0
ear canal volume- normal volume
indicate a normal middle ear system
jerger type B (fluid)
peak: no peak
ear canal volume: normal volume
jerger type B (perforated)
peak: no peak
ear canal volume: loud volume
larger ear canal volume indicates a perforation in the ear drum
jerger type C
peak: negative peak
ear canal volume: normal volume
This indicates negative pressure in the middle ear space
what is acoustic reflex
stapedius muscle contracts as a reaction to a loud sound, middle ear stiffens, compliance is decreased, impedence is increased
normal system usually 85 dbHL
Acoustic Reflex threshold (ART)
softest db SL level that can elicit this response (tested at 500, 1000, 2000 HZ)
left contralteral
left ear is stimulated, right is being tested
