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In rehab, the ECG signal is evaluated for its quality. The program analyses the signal quality separately for each ECG channel and assigns one of the following signal qualities every second:

ECG signal quality	Example ECG signal	Score value in information block	Description
good ECG quality

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Image Added	E:1	ECG must look like this, with such an ECG signal there are guaranteed no problems with the QRS detection
sufficient ECG quality

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Image Added	E:3	This ECG quality means that the QRS detection will still recognize every QRS complex due to internal filtering, but it is already an indication that one or the other QRS complex may be overlooked here.
insufficient ECG quality

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Image Added	E:6	This ECG quality means that the QRS detection is certainly "overlooked" despite the internal filtering of some QRS complexes (false negative) or disturbances of the ECG signal even as QRS detection (false positive).
non-physiological ECG quality

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E: !!

With such an ECG Signal no QRS complex can be detected. This occurs, for example, when the electrodes of the ECG conduction are open.

The ECG signal quality information is used for the following actions/displays

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As long as the ECG has a good quality, no display in online ECG appears on the overview page. In case of insufficient ECG quality, a transparent red rectangle appears on the right side of the online ECG. Depending on the number of ECG channels, either one or three colored rectangles are displayed.

3 channel ECG
1 channel ECG	Image Modified	In this case, one ECG channel has a insufficient on quality

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In this case the 1st ECG channel is displayed and channels 2 and 3 are of poor quality.
This can be seen from the slightly bolder representation of the channel designation I. If a single-channel ECG display is activated (and only then), channel occupancy of the current ECG channel is highlighted so that you can see which of the ECG channels are of bad or good quality, even if they are not currently displayed.
In this case, the displayed ECG channel 1 is of good quality, but the other two ECG channels (these are currently blanked out) are of insufficient quality.

The display of the ECG quality disappears automatically if this is OK.

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Any information block can be configured to display the ECG quality score value

1 channel ECG

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3 channel ECG
Image Added	The ECG channel has a quality score of 6, which means insufficient ECG quality.

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In this three-channel ECG display, the ECG channel 1 is of poor quality (score vauel of 6) and the other two channels are not physiological (score value of 20).

As numerical vaue

The determination of the ECG signal quality has as result a numerical value, which can be interpreted as a measure of the noise. This can be displayed as a single numerical value for each channel. The value itself is more of a technical specification and should therefore only be displayed in disputed quality cases.