E30 Digital Electrocardiograph User’s Manual
21
E.4 Stability of Measurements against NOISE
E.4.1 Acceptance of minimum waves
The labeling of the QRS waveforms depends by definition (since Einthoven) on the first
detected wave. A tiny positive wave at QRS beginning is called r or R and may mask a true,
following Q wave. Therefore the acceptance criteria of initial waveforms should be clearly defined
and standardised.
The following rule for acceptance of minimum waves is used by wave detection:
a) The signal part under consideration shows clearly two opposite slopes with at least one turning
point in between;
b) The signal part under consideration deviate at least 30μV from the reference level for duration
of at least 6 ms.
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