CMi PC-66L Manual De Uso página 37

Pulse Oximetry Knowledge
1 Meaning of SpO
SpO is the saturation percentage of oxygen in the blood, so
2
called O
2
percentage of oxyhemoglobin (HbO
hemoglobin of the arterial blood. SpO
physiological parameter to reflect the respiration function; it
is calculated by the following method:
HbO are the oxyhemoglobins (oxygenized hemoglobin),
2
Hb are those hemoglobins which release oxygen.
2 Principle of Measurement
Based on Lamber-Beer law, the light absorbance of a given
substance is directly proportional with its density or
concentration. When the light with certain wavelength
emits on human tissue, the measured intensity of light after
absorption, reflecting and attenuation in tissue can reflect
the structure character of the tissue by which the light
passes. Due to that oxygenated hemoglobin (HbO
deoxygenated hemoglobin (Hb) have different absorption
character in the spectrum range from red to infrared light
(600nm~1000nm
characteristics, SpO
by this oximeter is the functional oxygen saturation -- a
percentage of the hemoglobin that can transport oxygen. In
User Manual for Pulse Oximeter
2
concentration in the blood; it is defined by the
SpO = HbO
2
wavelength),
can be determined. SpO
2
/ (HbO +Hb)×100%
2 2
by
32
) in the total
2
is an important
2
) and
2
using these
measured
2