Part No. 715-0080, Rev. B
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SECTION 4: PULSE OXIMETRY (OPTIONAL FEATURE)
This section contains information regarding the pulse oximetry feature of the incubator. Principles of
operation, set-up instructions, and sensor options are detailed.
PULSE OXIMETER PRINCIPLES OF OPERATION
Pulse oximetry is based on several key principles:
the absorption of red and infrared light (spectrophotometry) by oxyhemoglobin and
deoxyhemoglobin
the change in volume of arterial blood in tissue (and hence, light absorption by blood) due to
changes in pulse (plethysmography)
the fluctuating absorbance of venous blood during arteriovenous shunting contributes to noise
during the pulse
Because oxyhemoglobin and deoxyhemoglobin differ in light absorption, the amount of red and
infrared light absorbed by the blood is related to hemoglobin oxygen saturation. The pulse oximeters
supported by the incubator, Masimo SET
and Nellcor OxiMax, decompose the red and infrared
pulsatile absorbance signals into an arterial signal plus a noise component and calculate the ratio of
arterial signals. The ratio of the two arterial pulse-added absorbance signals is used to find the
oxygen saturation in an empirically derived equation in the pulse oximeter software.
Different pulse oximetry sensors can be used with the system. The user should consult the sensor’s
instructions for use to ensure the appropriate sensor is being used. In addition, only Masimo sensors
should be used with the Masimo pulse oximeter and only Nellcor sensors should be used with the
Nellcor pulse oximeter. Sensor accuracy data, found in SECTION 11 (PULSE OXIMETER
SPECIFICATIONS (OPTIONAL FEATURE)), are based on human blood studies in which the values
obtained for healthy adult volunteers in induced hypoxia states during motion and non-motion
conditions were compared to a laboratory co-oximeter.
Erroneous SpO
2
readings may be caused by several reasons including, but not limited to, the
following:
Interfering
substances
such
as Carboxyhemoglobin and Methemoglobin (i.e. an increase in
SpO
2
approximately equal to the amount of carboxyhemoglobin present)
Dyes, or any substance containing dyes, that change usual blood pigmentation
Summary of Contents for AirBORNE A750i
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