Welch Allyn TM 262 Auto Tymp - User Manual - Manual (Page 50)

TM 262
3-16 Revised 4/11/08
When the tympanogram is completed and the test is finished, the steady green lamp turns
off and the display displays the complete tympanogram results.
7. It is now possible to remove the probe from the ear and to view the test results on the
display.
The test results are automatically stored in a page of memory. The actual memory location
number is determined by the number of tests that preceded this current test. For example,
if this is the first test to be stored in memory, it will be assigned the number Ml. If it is the
third test to be stored in memory, it will be numbered M3, etc.
In addition to the tympanogram tracing, the screen displays the test summary information.
This data includes the ear canal volume (ECV), the compliance peak in cm
3 , the pressure
at the peak of the tympanogram in daPa, and the gradient (GR) as a pressure width value.
This test result can be printed out immediately as a single test by selecting the pushbutton
labeled print screen only or other tests can be run and saved before all tests in memory are
printed via the print all pushbutton.
b. Tympanometry and Ipsilateral Reflex
The default parameters for this test are tympanometry followed by an ipsilateral acoustic reflex
test at 1000 Hz. To change this default setting, select the desired frequencies for the test as
described in the next topic, b. Programming ipsilateral acoustic reflex test frequencies.
Once a seal is obtained, the tympanometry sequence is initiated. (See topic a. Tympanometry
only mode earlier in this chapter for detail.s As long as no large leak is encountered during
tympanometry (orange lamp illuminated) and no occlusion is detected (yellow lamp
illuminated), the test automatically sequences on to the reflex portion of the test as follows.
a. The pressure from the tympanogram peak compliance is re-established within the ear
canal and is offset by -20 daPa so as to avoid any problems with extremely sharp
tympanogram slopes.
b. With the air pressure held constant throughout the reflex test sequence, the lowest
intensity level for the starting frequency is presented and a measurement of
compliance change is made. If the compliance decreases by at least 0.05 cm, this
reflex intensity level is stored in memory.
c. If no other frequencies were selected for the test, the Tymp Reflex sequence ends
here. The display will indicate the reflex test result as a Yes, as an HL value, or as an
HL value plus a tracing of the reflex response curve. The default setting established
in the Program mode determines the manner in which the reflex result is displayed.
See Program Mode earlier in this chapter. Note that the green lamp is no longer
illuminated indicating that it is time to remove the probe from the ear.
d. If no response is measured (i.e., a compliance decrease of at least 0.05 cm 3 was not
detected) at this lowest intensity level, the intensity level of the stimulus is
automatically increased by 10 dB. During this second presentation, a measurement of
compliance change is also made. If a response is detected, the test sequence for this
frequency ends and either the result is displayed on the screen or the test proceeds on
to the next frequency selected. However, if once again no response is detectable, the
intensity level is increased by 10 dB (e.g., 1000 Hz Ipsi = 105 dB HL) and the
stimulus is presented.