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by measurement and nd the hypoxemia patient earlier, thereby preventing or
reducing accidental death caused by hypoxia effectively.
3 Factors affecting SpO2 measuring accuracy (interference reason)
• Intravascular dyes such as indocyanine green or methylene blue.
• Exposure to excessive illumination, such as surgical lamps, bilirubin lamps,
uorescent lights, infrared heating lamps, or direct sunlight.
• Vascular dyes or external used color-up product such as nail enamel or color
skin care.
• Excessive patient movement.
• Placement of a sensor on an extremity with a blood pressure cuff, 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.
ENGLISH
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