Gima OXY-100 Manuel De L'utilisateur page 42

Common Knowledge
1 Meaning of SpO
SpO is the saturation percentage of oxygen in the blood, so called O
2
concentration in the blood; it is defined by the percentage of oxyhemoglobin
(HbO ) in the total hemoglobin of the arterial blood. SpO
2
physiological parameter to reflect the respiration function; it is calculated by
the following method: SpO
HbO are the oxyhemoglobins (oxygenized hemoglobin), Hb are those
2
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 ) and deoxygenated hemoglobin (Hb) have different absorption character
2
in the spectrum range from red to infrared light (600nm~1000nm wavelength),
by using these characteristics, SpO
oximeter is the functional oxygen saturation -- a percentage of the hemoglobin
that can transport oxygen. In contrast, hemoximeters report fractional oxygen
saturation – a percentage of all measured hemoglobin, including dysfunctional
hemoglobin, such as carboxyhemoglobin or metahemoglobin.
Clinical application of pulse oximeters: SpO
parameter to reflect the respiration and ventilation function, so SpO
used in clinical becomes more popularly, such as monitoring the patient with
serious respiratory disease, the patient under anesthesia during operation,
premature and neonate. The status of SpO
measurement and find the hypoxemia patient earlier, thereby preventing or
reducing accidental death caused by hypoxia effectively.
3 Normal SpO
2
In campagna area, healthy people's SpO
values below 94% are determined as hypoxia. SpO
the default threshold for determining anoxia by most researchers, so SpO
low limit of the oximeter is set as 90% generally.
ENGLISH
2
= HbO
2
Range and Default Low Limit
/ (HbO +Hb)×100%
2 2
can be determined. SpO
2
is an important physiological
2
can be determined in time by
2
value is greater than 94%, so the
2
is an important
2
measured by this
2
monitoring
2
<90% is considered as
2
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2
2