Fig. 2.

Representative examples of beat labelling on lead II for ECG parameter annotation. Paired examples of 12-lead and 6-lead ECGs in sinus rhythm and atrial fibrillation are shown. Each 10-s ECG recording was independently reviewed by a rater for rhythm classification. Three representative beats are selected and annotated. The horizontal purple line represents the isoelectric baseline. In both cases, the three beats were first labelled on the 12-lead ECG, and the corresponding temporally aligned beats (marked with blue dots) were subsequently labelled on the 6-lead ECG. ECG, electrocardiogram