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Patient Monitor User Manual
Chapter 13 SpO
13.1 What is SpO
The monitor uses oximetry to measure functional oxygen saturation in the blood. SpO
Plethysmogram measurement is employed to determine the oxygen saturation of hemoglobin in
the arterial blood. If, for example, 97% of the hemoglobin molecules in the red blood cells of the
arterial blood combine with oxygen, then the blood has a SpO
SpO
numeric on the monitor will read 97%.The SpO
2
hemoglobin molecules which have combined with oxygen molecules to form oxyhemoglobin.
The SpO
/PLETH parameter can also provide a pulse rate signal and a plethysmogram wave.
2
How the SpO
/PLETH Parameter Works
2
Arterial oxygen saturation is measured by a method called pulse oximetry. It is a continuous,
non-invasive method based on the different absorption spectra of reduced hemoglobin and
oxyhemoglobin. It measures how much light, sent from light sources on one side of the
sensor, is transmitted through patient tissue (such as a finger or an ear), to a receiver on the
other side.
The amount of light transmitted depends on many factors, most of which are constant.
However, one of these factors, the blood flow in the arteries, varies with time, because it is
pulsating. By measuring the light absorption during a pulsation, it is possible to derive the
oxygen saturation of the arterial blood. Detecting the pulsation gives a PLETH waveform
and pulse rate signal.
The SpO2 value and the PLETH waveform can be displayed on the main interface.
Pulse oximetry can overestimate the SpO
dye dilution chemicals.
SpO
/Pulse Monitoring
2
1
ES (Electrosurgery) equipment wire and SpO
2
Do not put the sensor on extremities with arterial catheter or venous syringe.
NOTE:
Do not perform SpO
because obstruction of blood flow during NIBP measuring may adversely affect the
reading of SpO
value.
2
Monitoring
2
Monitoring
2
WARNING
WARNING
measuring and NIBP measuring on the same arm at one time,
2
oxygen saturation of 97%. The
2
numeric shows the percentage of
2
value in the presence of Hb-CO, Met-Hb or
2
cable must not be tangled up.
2
- 102 -
SpO
Monitoring
2
2
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