User's Manual

F Series Fetal & Maternal Monitor User Manual Maternal Monitoring
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NOTE:
1 The nail should cover the light but not too long.
2 The cable should be placed on the backside of the hand.
3 Avoid external light sources such as radiated rays or ultrared rays.
9.2.3 Enabling SpO
2
Trace Printing
The real-time SpO
2
measurement result is displayed in the parameter area of the main interface.
You can choose to print them as a continuous trace on the recorder paper (refer to figure 5-1).
To enable or disable SpO
2
trace printing,
1 Select the setup key
on the main interface.
2 Select Recorder > SpO
2
Trace.
3 Select ON or OFF (default).
4 Select OK.
9.2.4 Assessing the Validity of a SpO2 Reading
You can check the quality of the pleth wave and the stability of the SpO2 values to assess
whether the sensor functions properly and whether the SpO2 readings are valid. Always use these
two indications simultaneously to assess the validity of a SpO2 reading.
NOTE:
1 The SpO
2
accuracy has been validated in human studies against arterial blood
sample reference measured with a CO-oximeter. Pulse oximeter measurements are
statistically distributed, only about two-thirds of the measurements can be expected
to fall within the specified accuracy compared to CO-oximeter measurements. The
volunteer population in the studies composed of local healthy men and women from
age 19 to 37, with variations of skin pigmentations. The SpO
2
accuracy is as follows:
±2% for 90%-100% and ±4% for 70%-90%.
2 The pulse rate accuracy is obtained by comparison to the pulse rate generated with
an arterial oxygen simulator (also an electronic pulse simulator).
3 Generally, the quality of the SpO
2
pleth wave reflects the quality of the light signals
obtained by the sensor. A wave of poor quality manifests a decline of the signal
validity. On the other hand, the stability of the SpO
2
values also reflects the signal
quality. Different from varying SpO
2
readings caused by physiological factors,
unstable SpO
2
readings are resulted from the sensor’s receiving signals with
interference. The problems mentioned above may be caused by patient movement,
wrong sensor placement or sensor malfunction. To obtain valid SpO
2
readings, try to
limit patient movement, check the placement of the sensor, measure another site or
replace the sensor.