Tympanometry and ECV Flashcards
What is tympanometry
A test used to detect disorders of the tympanic membrane and the middle ear
Origin of tympanometry
Tympanon- tympanic
Metrein - to measure
What does tympanometry measure?
Pressure (the amount in the middle ear)
Compliance (amount of tympanic membrane movement)
Type A tympanogram
Normal pressure (+50 to -100 daPa
Normal compliance(within 0.3 to 1.6 mm H2O or ml)
When do we see a type A tympanogram?
Patients who have normal middle ear and tympanic membrane functions
Type As tympanogram
Normal pressure (+50 to -100 daPa) Low compliance (less than 0.3 mm H2O)
Clinical presentation of As
Otosclerosis - the stapes has become partially or completely fixed or immobilized
Type Ad tympanogram
Normal pressure (+50 to -100 daPa)
High compliance
More than 1.6 mm h2o or ml
Clinical presentation ofAd
Atrophic scab, ossicular chain disarticulation
Type C tympanogram
Negative pressure more negative than -100 daPa Normal compliance (0.3 - 1.6 mm h2o
Clinical presentation of type C tympanogram
Eustachian tube dysfunction
Type B tympanogram
Tracing is flat or with no discernible peak
Clinical presentation of type B tympanogram
Otitis media with effusion Tympanic membrane perforation Tympanostomy tube Atelectasis Earwax Probe sealed against the external ear canal wall
Ear canal volume
Measurement of the volume of air medial to the probe
Volume between probe tip and tympanic membrane
Normal Ear canal volumes
Children 0.3 - 0.9
Adult 0.9 -2.0
