Table 2.

ECG annotation conventions.

Signal Quality
Q0	<80% of QRS complexes are undoubtfully identified, reliable heart rate (HR) calculation not possible
Q1	≥80% QRS complexes are undoubtfully identified, HR calculation is credible
Q2	Q1 and no R-peak position uncertainty, no artifact, heart rate variability (HRV) calculation is possible
Signal Morphology
M1	P- and T-wave can be seen in nearly all QRS complexes
M0	Not M1