5.4.3.3 Immittance Measurements
Show the probe to the patient and then explain the following:
• An eartip is placed on the tip of the probe and inserted into the ear canal. A seal
must be achieved for the test to progress.
• Coughing, talking and swallowing will disturb test results.
• The aim of Tympanometry is to test the mobility of the eardrum and the
condition of the middle ear.
o A small amount of air will flow through the probe to move the eardrum; it produces
a sensation equal to pressing a finger slightly into the ear canal.
o One or more tones will be heard during the test. No participation is
expected from the patient.
• The aim of Acoustic Reflexes is to test the condition of the Musculus stapedius.
o One or more louder tones will be heard during the test. No participation is
expected from the patient.
• The aim of Reflex Decay is test the integrity of the CN VIII.
o One tone is presented above the acoustic reflex threshold measurement for
a minimum period of 10 seconds.
• The aim of ETF is to test the condition of the Eustachian tube.
o ETF Intact: three tympanograms are completed while the patient performs
a manueaver between each tympanogram.
o ETF Perforated: pressure level is obtained in the ear canal and the patient
swallows to measure change of pressure.
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