20 Monitoring SpO2
SpO2 Signal Quality Indicator (FAST SpO2 only)
is available) which gives an indication of the reliability of the displayed values.
The level to which the triangle is filled shows the quality of the signal; the indicator below shows a
medium signal quality. The signal quality is at a maximum when the triangle is completely filled.
Assessing a Suspicious SpO2 Reading
Traditionally, pulse rate from SpO
the correct calculation of SpO
When the pulse rate is very low, or strong arrhythmia is present, the SpO
the heart rate calculated from ECG, but this does not indicate an inaccurate SpO
With Pulse oximetry, sensor movement, ambient light (especially strobe lights, or flashing lights), or
electromagnetic interference can give unexpected intermittent readings when the sensor is not
attached. Especially bandage-type sensor designs are sensitive to minimal sensor movement that might
occur when the sensor is dangling.
Understanding SpO2 Alarms
This refers to SpO
low alarm limit below the desat alarm limit.
If you measure SpO
INOP can occur. If the fetal monitor is configured to suppress this alarm, there may be a delay
of up to 60 seconds in indicating a critical status, such as sudden pulse loss or hypoxia.
numeric is displayed together with a signal quality indicator (if configured and enough space
reading. With newer algorithms, such as FAST-SpO
is not directly linked to the correct detection of each pulse.
specific alarms. See the "Alarms" on page 99 chapter for general alarm
offers high and low limit alarms, and a high priority desat alarm. You cannot set the
on a limb that has an inflated noninvasive blood pressure cuff, a non-pulsatile
was compared with heart rate from ECG to confirm the validity of
, this is no longer a valid criteria because
pulse rate may differ from