Pulse oximetry
12-1
12 Pulse oximetry
Overview
Oxygen saturation SpO
2
is the percentage of saturated hemoglobin compared to total
hemoglobin measured by a two wavelength pulse oximeter (also called functional or In Vivo
oxygen saturation.
The SpO
2
value is measured by light absorption technique: Red and infrared light is emitted
from the emitter side of the sensor. The light is partly absorbed when it passes through the
monitored tissue. The amount of transmitted light is detected in the detector side of the sensor.
When the pulsative part of the light signal is examined, the amount of light absorbed by
arterial hemoglobin is discovered and the saturation level can be calculated.
The plethysmographic pulse wave is derived from variations of the intensity of the transmitted
light and reflects the blood pulsation at the measuring site. Thus the amplitude of the
waveform reflects the perfusion.
Module description
NOTE: In the monitoring system, use only one module measuring pulse oximetry.
E-PSMW
E-PSMPW
Pulse
oximetry
connector
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