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Chapter 10 Pulse CO-Oximetry (SpO2)
The X Series pulse CO-oximetry option is intended for use only with ZOLL / Masimo Rainbow
sensors. The CO-oximetry sensor contains light-emitting diodes (LEDs) that transmit various
visible and infrared light through the body's extremities. The transmitted light is then received
by a photodetector, which converts it to an electronic signal. The signal is then sent to the X
Series unit for processing.
Oxygen-saturated blood absorbs light differently than unsaturated blood. Thus the amount of
visible and infrared light absorbed by blood flowing through a suitable peripheral area of the
body, typically the finger in adults and the foot in neonates, can be used to calculate the ratio of
oxygenated hemoglobin to total hemoglobin in arterial blood. The monitor displays this ratio as
a percent (normal values typically range from 95% to 100% at sea level) alternating with SpCO
and SpMet, and SpHb, SpOC, PVI and PI values if available on your unit.
Note:
The measurements rely on multiwavelength calibration equations to estimate the:
Percentage of carboxyhemoglobin in arterial blood (SpCO).
•
Percentage of methemoglobin in arterial blood (SpMet).
•
Total hemoglobin concentration present in the blood (SpHb).
•
Total oxygen content present in the blood (SpOC).
•
Peripheral perfusion changes secondary to respiration (PVI).
•
The arterial pulse strength as the percentage of pulsatile signal to non-pulsatile signal (PI).
•
The quality of measurements depends on the correct size and application of the sensor,
adequate blood flow through the sensor site, and the sensor's exposure to ambient light. For
correct placement and location of the sensors, refer to the Directions for Use contained with all
Rainbow oximetry sensor packages.
10-2
The monitor does not display SpCO values when you use a SpHb sensor and does not
display SpHb values when you use a SpCO sensor.
www.zoll.com
9650-001355-01 Rev. M
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