Product Manual

6
43
Pulse Oximetry Operation
The following factors may cause inaccurate measurements during an SpO
2
reading:
If blood pressure measurement is occurring simultaneously, place the finger clip sensor
on the limb opposite the one with the blood pressure cuff.
1. Insert the patient’s finger completely into the sensor; the thumb is specifically not
recommended for use with the Nellcor finger clip sensor.
The pulse signal bar graph illuminates, indicating the relative strength and quality of
the patient’s pulses at the sensor site. The sensor takes approximately 10 seconds to
determine the initial SpO
2
% value and pulse rate. When the initial values are
determined, they are shown in the SpO
2
display and the pulse rate display,
respectively. If the accuracy of any measurement does not seem reasonable, first use
an alternate means to check the patient’s vital signs and then check the Spot LXi for
proper functioning.
• Patient is in cardiac arrest or shock. • Excessive patient movement.
• Bright light. • Sensor is too tight.
• Moisture in the sensor. • Placement of a sensor on an extremity with a blood pressure
cuff, arterial catheter, or intravascular line.
• Incorrect sensor application or use. • Poor patient perfusion.
• Arterial occlusion proximal to the sensor. • Venous pulsations.
• Intravascular dyes such as indocyanine green
or methylene blue.
• Significant levels of dysfunctional hemoglobins (e.g.,
carboxyhemoglobin or methemoglobin).
• Fingernail polish (if finger sensor is used). • Patient has hypotension, severe vasoconstriction, severe
anemia, or hypothermia.
• Exposure to excessive illumination, such as surgical lamps
(especially ones with a xenon light source), bilrubin 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).
WARNING Tissue damage can be caused by incorrect application or duration of
use of a Nellcor OxiMax sensor. Inspect the sensor site as directed in the sensor
Directions for Use.
WARNING Do not use a damaged sensor or pulse oximetry cable or a sensor
with exposed optical components.