GE Dash 3000 Service Manual page 139

No Respiration Waveform or Rate Appear on the Display
Markers do not Appear on Respiration Waveform; Respiration Rate is Inaccurate
Respiration Functions Work Properly on Patient Simulator but not on Actual
Patient
Revision A
Troubleshooting: Data Acquisition Tests
If the respiration waveform or rate does not appear on the monitor
display, perform the following steps to isolate the problem.
1. Vary the baseline impedance on the patient simulator
2. Vary the ∆R on the patient simulator.
3. Test the patient simulator and appropriate patient cables on a
working monitor to determine the source of the problem.
4. 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.
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. Use the Trim Knob control on the
monitor to select the following menu options.
1. Scroll to and select RR (respiration parameter) from the monitor
main menu,
2. Scroll to and select SENSITIVITY from the respiration parameter
menu, and
3. Scroll to and select a different sensitivity percentage (%) from the
sensitivity menu
NOTE
Usually, a lower respiration sensitivity % level rectifies this
problem.
Refer to the Operator's 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. Following is an example of a
noisy respiration waveform which is usually due to bad patient
preparation.
NOTE
With patients that exhibit excessively high baseline chest
impedance, proper respiration monitoring can be extremely difficult,
if not impossible.
Dash 3000/4000 Patient Monitor
2000966-339
583A
5-23