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Chapter 5 Measuring SpO
5.1 Introduction
The measurement of oxygen saturation of arterial blood (also known as
pulse oxygen saturation, usually shortened as SpO
of light spectra and volume tracing. The LED emits lights with two specific
wavelengths, which
and deoxyhemoglobin. The optical receptor measures the changes in the light
intensity after the light passes the capillary network and estimates the ratio of
oxygenated hemoglobin and the total hemoglobin.
SpO
% =
2
Wavelengths of the light emitted by the pulse oximeter probe are nominally
660nm for red LED and 940nm for infrared LED.
5.2 Safety Information
Warning:
• Use only SpO
the SpO
warnings and cautions.
• When a trend toward patient deoxygenation is indicated,
blood samples should be analyzed by a laboratory
co-oximeter to completely understand the patient's
conditions.
• Do not use the monitor and the SpO
magnetic resonance imaging (MRI). Induced current could
cause burns.
• Prolonged continuous monitoring may increase the risk
of unexpected changes in skin characteristics, such as
irritation, reddening, blistering or burns. Inspect the sensor
site every two hours and move the sensor if the skin quality
changes. For neonates, or patients with poor peripheral
blood circulation or sensitive skin, inspect the sensor site
more frequently.
2
are
selectively absorbed
oxygenated hemoglobin
oxyhemoglobin + deoxyhemoglobin
sensors specified in this manual. Follow
2
sensor's instructions for use and adhere to all
2
84
www.spengler.fr
) adopts the principles
2
by oxygenated
hemoglobin
x 100 %
sensor during
2
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