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It is four in the morning, and the ward is quiet. A junior doctor has been on her feet for nine hours. She is tired, her muscles are sore and her eyes are straining, but when her shift ends at six in the morning and she finally gets home, she struggles to sleep

For doctors, this raises a difficult question: how can they record something that is not happening during an examination? A standard electrocardiogram (ECG) shows the heart’s activity only at a specific moment, while even longer-term monitoring does not always coincide with less frequent episodes of heart rhythm disorders. As a result, some arrhythmias, particularly short…