20
arterial catheter, or intravascular line.
• Exposure to the chamber with High pressure oxygen.
• There is an arterial occlusion proximal to the sensor.
• Blood vessel contraction caused by peripheral vessel hyperkinesias
or body temperature decreasing.
4. Factors causing low SpO2 Measuring value
(pathology reason)
• Hypoxemia disease, functional lack of HbO2.
• Pigmentation or abnormal oxyhemoglobin level.
• Abnormal oxyhemoglobin variation.
• Methemoglobin disease.
• Sulfhemoglobinemia or arterial occlusion exists near sensor.
• Obvious venous pulsations.
• Peripheral arterial pulsation becomes weak.
• Peripheral blood supply is not enough.
2.5 Caution
A. The nger should be placed properly (see the attached illustration of
this manual), or else it may cause inaccurate measurement.
B. The
SpO2
sensor and photoelectric receiving tube should be ar-
ranged in a way with the subject’s arteriole in a position there be-
tween.
C. The
SpO2
sensor should not be used at a location or limb tied with
arterial canal or blood pressure cuff or receiving intravenous injection.
D. Do not x the
SpO2
sensor with adhesive or else it may result in ve-
nous pulsation and inaccurate measure of
SpO2
.
E. Make sure the optical path is free from any optical obstacles like rub-
berized fabric.
F. Excessive ambient light may affect the measuring result. It includes
uorescent lamp, dual ruby light, infrared heater, direct sunlight and
etc.
G. Strenuous action of the subject or extreme electrosurgical interfer-
ence may also affect the accuracy.
H. Testee can not use enamel or other makeup on the nger.
ENGLISH
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