Arterial Oxygen Saturation and Pleth (SpO
2
/PLETH) Measurement
Introduction to the Instrument
33
Arterial Oxygen Saturation and Pleth (SpO
2
/PLETH)
Measurement
Description
The Measurement Server has a pulse, arterial oxygen saturation, and plethysmogram
measurement.
Measurements
The measurement produces numerics for the arterial oxygen saturation value and the pulse
rate, along with a real-time wave for the plethysmogram.
SpO
2
/PLETH Features
This illustration shows the user controls and connector for the SpO
2
/PLETH. The parts are
described following the illustration below.
Safety
To ensure the safety of the patient, the patient-applied part is isolated from ground by opto-
couplers and a transformer. The circuit is also encapsulated in plastic.
PLETH Wave
The circuit automatically and continuously adjusts the size of the wave, which represents the
quality of the SpO
2
measurement signals. Manual wave adjustments in this mode are not
possible. If the signal quality becomes weak, the wave becomes progressively smaller. If the
signal degrades below an acceptable level, the wave becomes flat and an INOP alarm results.
A poor signal may be caused by poor perfusion at the transducer site, or by the transducer; it
is not related to low oxygen saturation.
This is a standard 8-pin
connector for use with an
SpO
2
/PLETH transducer.
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