Troubleshooting
79
General Oximetry Subsystem Problems
4. PULSE SEARCH indicator is on; SpO2 and pulse rate
not displayed.
• Check the patient. The patient may be experiencing
shock, hypotension, severe vasoconstriction, severe
anemia, hypothermia, arterial occlusion proximal to
the sensor, or cardiac arrest.
• The sensor may be improperly applied (for example,
too tight) or it may not be plugged in.
• There may be excessive ambient light; cover the sensor
site with opaque material.
• The sensor may be placed on an extremity with a blood
pressure cuff, arterial catheter, or intravascular line.
Move the sensor to an alternate site that is not
affected.
• The patient’s perfusion may be too low for the N-200 to
detect an acceptable pulse.
• Use C-LOCK ECG synchronization; test the N-200 on
someone else; try another sensor site; or try another
sensor (see the NELLCOR Sensors section for
suggestions).
• The sensor may be damaged; replace it.
• The patient module may be damaged; try another
patient module.
5. The pulse amplitude indicator tracks a pulse, but
there is no oxygen saturation or pulse rate.
• Check the patient.
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