What could cause the Signal Quality Index (SQI) to decrease?
If the impedance of the white or black sensors exceeds 1kΩ, the SQI will fall gradually. Poor impedance conditions may cause the SQI to fall to 50%. See question 3.14 on sensor impedance. Always check all sensors and cable connections. Some mechanical devices (e.g. patient warmers) could generate high frequency activity, especially when in close proximity to the CSM sensors. If possible move disturbing device away from CSI sensors. Check grounding on disturbing device. Reduce the influence from disturbing device running the CSM on batteries.
