When abnormal results are found, it is prudent to repeat the test results.  In ‘test 2′ below, the notching could have been due to patient movement.  Test 3 shows a much different finding. Note that test 4 was conducted at a slower rate of pressure change. The fast rates are considered appropriate for screening, but not for diagnostic workups, so the “valid” tympanogram is the one at the slowest rate.

Acoustic Reflex Data

Thresholds

The tympanograms below are NOT on the same patient.  They are for a 60 year old female, and also illustrate that results that look abnormal at a fast rate may not be abnormal at a slow rate.

• What is the term that is used to describe this “speed related” abnormality?