45 Multiple choice questions
- there's an obstruction of the ear canal or improper probe placement
- NOT to diagnose a disorder, but to assess the outer ear and TM and middle ear for something obviously atypical
(can assist in interpreting other audiological evaluation results)
- less than 0.3 ml
-reflects stiffness of the middle ear system.
- point where there is most acoustic energy passed
- peak admittance (sometimes static compliance)
physical volume (aka ear canal volume)
- Detecting middle ear disorders (tympanometry and reflexes)
Differentiating different types of middle-ear pathology (tymp. and reflexes)
Differentiating cochlear from retrocochlear pathology (reflexes & reflex decay)
Facial nerve (reflex) and eustachian tube function (tympanometry)
- before tympanometry
- the tympanic membrane is not intact (so it picks up the volume of the middle ear too)
- 0.3 ml - 2.0 ml
- indicates normal middle ear function, NOT normal hearing
- middle ear pressure is negative relative to outer ear pressure. Sign of Eustachian Tube Dysfunction
- where the tympanogram peak falls horizontally
- color: not normal if white or grey.
Bulging or Retraction
Fluid line or Bubbles
- measure stapedial muscle reflex, which stiffens the middle ear system when elicited by high intensity sounds.
- greater than 2.0 ml.
-reflects flaccidity of TM/ossicles, aka excessive compliance
- acoustic energy passed by the tympanic membrane into the middle ear
- +100 to -150 daPa
- either the probe tip was misplaced, or there is an ear canal obstruction
- normal shape, normal peak admittance, excessively negative peak pressure.
- less than -150 daPa
- this term reflects what the test measures; combination of the words "impedance" and "admittance"
- provided on the screen or print out.
The Physical Volume of the ear canal beyond the probe
- opposition to flow of acoustic energy at the middle ear
- 7 months
- .6 to 2.5 ml
-depends on age, gender, body size, etc
- structural defect of the ear, head or neck
ear canal abnormalities
tympanic membrane abnormalities
- admittance of sound at the peak of the tympanometry trace.
in ml, cc or mmho
shown by the hight of the tympanogram at its peak
- excessively middle ear system
normal shape, peak pressure, HIGH peak admittance: >2.5 ml
- flat. no peak (abnormal shape)
very low admittance; so little or no mobility
- Blood or effusion (drainage)
excessive cerumen or foreign object
probe tone is constantly on and the Microphone can measure how much
sound is absorbed/admitted, and how much is reflected into the ear canal
- Type B with abnormally large ear canal volume
- 0 daPa.
admittance (passing of acoustic energy) declines as the air pressure moves away from 0, either positively or negatively.
- admittance of sound into the middle ear at varying degrees of positive and negative pressure in the external auditory canal.
- relative to the air pressure in the middle ear
- the TM is not intact
- normal middle ear function
normal shape, peak pressure and peak admittance
- eustachian tube dysfunction.
-may reflect oncoming of otitis media
Acoustic Reflex Thresholds
- check ear canal volume
- TM is intact, there's no ear canal obstruction, but there's little to no mobility of the TM
- stiffened middle ear system.
normal shape, peak pressure, LOW peak admittance: < .3 ml
- otitis media with effusion
- equal on both sides (normal resting position), at 0 daPa