10-2
Respiration Solutions
Problem Possible Causes Action/Solution
Erratic Respiration rate and
waveform.
Poor electrode placement or
conductivity.
Confirm proper electrode
placement and adhesion.
Respiration rate displayed less
than actual rate.
Respiration waveform amplitude
is too low.
Use RESP SIZE function to
increase waveform amplitude.
Respiration rate displayed higher
than actual rate.
Cardiovascular artifact (CVA) is
interfering with signal.
Reposition LA electrode to
reduce CVA.
SpO
2
Solutions with Nellcor
Problem Possible Causes Action/Solution
Pleth waveform does not track
pulse; SPO2 SRCH is displayed,
or oxygen saturation does not
display.
Sensor is not applied correctly.
Damaged sensor or cable.
Patient’s perfusion too poor for
oximeter to detect pulse.
Excessive patient motion.
Check sensor application.
Verify red light on sensor
illuminates. Replace cable if
needed.
Try another sensor site.
Reduce patient motion or set
response mode to SLOW.
NO C-LOCK message. Poor patient perfusion.
ECG electrode or lead is loose.
Try another sensor site.
Check all ECG connections.
NO SENSOR is displayed. Sensor not connected.
Damaged Sensor or cable.
Unknown sensor connected.
Check sensor connections.
Verify red light on sensor
illuminates. Replace cable if
necessary.
Replace with Nellcor sensor.
LOW SIG is displayed. Sensor off patient. Place sensor on patient.
ARTIFACT is displayed. Excessive patient motion. Reduce patient motion.
O2 WRT ER May indicate an older version of
main software and SLOW mode
is selected.
Select either NORM or FAST
mode.
SpO
2
Solutions with Masimo
Problem Possible Causes Action/Solution
Pleth waveform does not track
pulse; SPO2 SRCH is displayed,
or oxygen saturation does not
display.
Sensor not applied correctly.
Damaged Sensor or cable.
Patient’s perfusion too poor for
oximeter to detect pulse.
Excessive patient motion.
Environmental interference.
Check sensor application.
Verify red light on sensor
illuminates. Replace cable if
needed.
Try another sensor site.
Disconnect and reconnect sensor
from cable to reacquire SpO
2
data.
Reduce patient motion.
Move from light or noise source.
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