GE Medical Systems marquette Dash 2000, Service Manual, Page: 94 / 202

TROUBLESHOOTING: Data Acquisition Tests
4-12 DASH 2000 Patient Monitor Revision A
2000 412-001
Verify the following:
¥ Respiration rate is displayed and accurate.
¥ Respiration waveform is displayed and noise-free.
¥ Markers appear in the displayed respiration waveform (refer to
figure at left). These indicate the points at which the monitor senses
inspiration and expiration for determination of the respiration rate.
No Respiration Waveform
or Rate Appear on the
Display
If the respiration waveform or rate does not appear on the monitor
display, perform the following steps to isolate the problem:
¥ Vary the baseline impedance on the patient simulator
¥ Vary the ÆR on the patient simulator.
¥ Test the patient simulator and appropriate patient cables on a
working monitor to determine the source of the problem.
¥ If none of the previous recommendations corrects the problem, the
acquisition PCB is suspect. Swap the PCB into a working monitor to
determine the source of the problem and replace as necessary.
Markers do not Appear on
the Respiration
Waveform; Respiration
Rate is Inaccurate If the markers on the respiration waveform do not appear on the display
or the respiration rate count is inaccurate, try changing the respiration
sensitivity level on the monitor. To do this, use the Trim Knob on the
monitor to:
¥ Scroll to and select RR (respiration parameter) from the monitor
main menu,
¥ Scroll to and select SENSITIVITY from the respiration parameter
menu, and
¥ Scroll to and select a different sensitivity percentage (%) from the
sensitivity menu
NOTE
Usually, a lower respiration sensitivity % level rectifies
this problem.
Respiration Functions
Work Properly When
Using A Patient Simulator
but not on an Actual
Patient
Refer to the OperatorÕs Manual for detailed information regarding
patient preparation relative to respiration monitoring functions.
Achieving optimum results for respiration waveforms and accurate
respiration rate detection by the monitor, requires proper preparation for
ECG electrode placement on the patient. An example of a noisy
respiration waveform, usually due to bad patient preparation, is shown
at the left.
NOTE
With patients that exhibit excessively high baseline chest
impedance, proper respiration monitoring can be
extremely difficult, if not impossible.