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Figure 1 Assessment of QT interval during atrial arrhythmia and sinus rhythm. (A) The end of the QT interval (diamond) during atrial fibrillation is clarified by comparing it with the end of the QT interval in sinus rhythm (*) after conversion. (B) The end of the QT interval (diamond) during atrial flutter is clarified by comparing it with the end of the QT interval in sinus rhythm (*) after conversion.