There are 3 primary reasons why the Signal Quality Line report segments of yellow, amber, or red signal.
Signal Loss - The mobile app was not able to communicate with the recorder and therefore no signal is received for that period. The result will be a gap in the analysis.
Artifact - Poor sensor contact or excessive motion during recording will result in signal noise that does not produce valid output. The result is a signal that does not have the appearance of a physiological signal and may exceed the upper and lower extremes of the graph.
Physiological abnormalities - In patients with chronic arrhythmia, the SleepImage System may be unable to provide to analyze the signal successfully. In these cases, the signal quality line will be yellow, amber, or red, even though the input signal is absent any signal loss or artifact. If a patient is suspected of having arrhythmia, please refer them to the appropriate specialist for further evaluation. The SleepImage System is not intended to rule in or rule out arrhythmia.
For more details, please see our Learn More page, under the Additional Information section.