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Case7 For Better SpO2 Monitoring - SQI, Signal Quality Index
The SpO2 value is often affected by the patient’s condition, artifacts created by external devices or by inappropriate attachment of probes, while monitoring continuously.
Nihon Kohden’s monitor has several features for better SpO2 measurement. Let us introduce one of the features here: SQI, Signal Quality Index.
For other three features, please see in each page. Pulse-amplitude Index, Sensitivity Mode, and Response.
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Signal Quality Index (SQI)
Nihon Kohden’s monitors display the quality of the pulse waveform signal, which is used to measure SpO2, by a bar graph. If the SQI bar graph displays 2 yellow bars or below, check for the patient’s physical movement and/or how a probe is attached.
SQI Bar Graph | Signal Quality |
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Good. |
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There may be some artifacts. |
2 yellow bars 1 |
There may be significant artifacts. If this continues for a while, check the patient and probe attachment site. |
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Very low. Check the patient and probe attachment site. |
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The signal cannot be detected. |
1 If the SQI bar graph shows 1 or 2 bars, the “Low Quality Signal” message appears on the monitor.