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A 69-year-old lady without any relevant medical history presented with recurrent palpitations. A 12-lead ECG was recorded and is shown in figure 1. The differential diagnosis of the narrow-complex tachycardia with a P:R ratio of 1:2 was (1) atrial …
Ethics approval This is not a study. The patient gave her consent for publication (even though the report does not identify her).
Provenance and peer review Not commissioned; internally peer reviewed.