Product Manual

9-14 CARESCAPE V100 Vital Signs Monitor 2036991-001C
Nellcor OXIMAX SpO2: Troubleshooting
PROBLEM: The oxygen saturation measurement does not correlate with the
value calculated from a blood gas determination.
CAUSE:
 The SpO
2
calculation may not have correctly adjusted for the effects of pH;
temperature; CO
2
; fetal hemoglobin; or 2,3-DPG.
 Accuracy can be affected by incorrect sensor application or use;
intravascular dyes; bright light; excessive patient movement; venous
pulsations; electrosurgical interference; and placement of a sensor on an
extremity that has a blood pressure cuff, arterial catheter, or intravascular
line.
SOLUTION:
 Check that calculations have been corrected appropriately for the relevant
variable. In general, calculated saturation values are not as reliable as direct
laboratory hemoximeter measurements.
 If there is excessive light, cover the sensor with opaque material.
 Circulation distal to the sensor site should be checked routinely. Refer to the
Nellcor sensor’s directions for use supplied with the sensor for requirements
on moving the sensor to another site to ensure adhesion, skin integrity, and
correct optical alignment. If skin integrity changes, move the sensor to
another site.
 Try to keep the patient still, or change the sensor site to one with less
motion.
 Observe all instructions, warnings, and cautions in this manual and in the
directions for use of the sensor.
PROBLEM: A valid SpO
2
signal was present but has disappeared.
CAUSE:
 An NIBP determination on the same limb is in progress.
SOLUTION:
Check the patient.
 An alarm message code appears on the screen, and the audible alarm will
sound immediately.
 Move the sensor to the arm that is not connected to a blood pressure cuff.
PROBLEM: An E21 REPLACE SENSOR error code has been detected.
CAUSE:
 The sensor or cable may be the wrong type or defective, the cabling may be
improperly connected.
SOLUTION:
Check the patient.
 If possible, keep the patient still; check whether the proper sensor/cable is
applied securely and properly, and replace it if necessary.
 Disconnect and reconnect the sensor.