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Parameter filtering and signal quality
Parameter filtering
When configured, the parameter filter calculates a moving average of the calculated
parameter values. The averaging time can be configured with the Config UI. Using
the parameter filter makes the values more accurate but may delay the visibility of
changes. Also increasing the averaging time reduces fast variations in parameter
values.
The averaging is weighted using the estimated reliability (SQI) and time of each value.
Short periods of artifact in original values will have limited effect on the displayed
value. Also, recent values will have higher weight than older values. When used
together with the parameter filtering, the SQI reflects the reliability of the filtered value
If the original measurement is reliable and the value clearly violates the alarm limit,
the value is updated faster to decrease the delay to alarms. Similarly, if the value is
reliable and returns within the alarm limits, the value is updated faster to reduce
unnecessary alarms. The fixed alarm delays are still applied.
Signal quality indicator (SQI)
The signal quality indicator (SQI) displays the estimated reliability of a parameter value.
On the Central Viewer the SQI is only available in the Single Patient View. On the Hub it
is available in LIVE and detailed views.
The SQI is represented by filled circles:
Each parameter (respiration, SpO
calculated based on the same pleth waveform, their measurement principles are
different and therefore the reliability of the values is not the same. The following
factors affect both of these measurements:
5815148-01
Indicates a reliable signal: accurate value.
Indicates an average signal: slightly increased likelihood of inaccurate
values.
Indicates a weak signal: increased likelihood of inaccurate values.
Indicates no signal: no reliable value available.
and PR) has its own SQI. Even if SpO
2
Portrait
™
Mobile Monitoring Solution
11
and PR are
2
91
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Troubleshooting
