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Example of a 86-year-old female patient with history of hypertension and vascular disease presenting with a bifascicular block (right bundle branch block and a left anterior fascicular block) in the standard 12-lead electrocardiogram (upper panel). Accordingly, resembling QRS morphology and axis deviation were identified in the self-recorded smartwatch electrocardiogram (lower panel). The interval 10–20 s of the smartwatch recordings are presented.
