Patient Monitor User’s manual
9-7
【12.50mm/s】or【25mm/s】as required.
9.6 Measurement Limitations
If you doubt the SpO
2
measurements, check the patient’s vital signs first, then
check the monitor and SpO
2
sensor. The following factors may influence the accuracy
of measurements:
——Incorrect sensor application or use;
——Significant levels of dysfunctional hemoglobins.(such as
carboxyhemoglobin or methemoglobin);
——Intravascular dyes such as indocyanine green or methylene blue;
——Exposure to excessive illumination, such as surgical lamps (especially
ones with a xenon light source), bilirubin lamps, fluorescent lights, infrared
heating lamps, or direct sunlight (exposure to excessive illumination can be
corrected by covering the sensor with a dark or opaque material)
——Excessive patient movement;
——Venous pulsations;
——Placement of a sensor on an extremity with a blood pressure cuff, arterial
catheter, or intravascular line.
——Low perfusion;
——Electromagnetic interference, such as MRI device;
—— Electrosurgical units.
The monitor can be used during defibrillation, but the readings may be inaccurate
for a short time
Loss of pulse signal can occur in any of the following situation:
——The sensor is too tight;
——There is excessive illumination from light sources such as a surgical lamp, a
brilirubin lamp, or sunlight;
——A blood pressure cuff is inflated on the same extremity as the one with a SpO2
sensor attached;
——The patient has hypotension, severe vasoconstriction, severe anemia, or
hypothermia;
——There is arterial occlusion proximal to the sensor.
——The patient is in cardiac arrest or is in shock.
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