Capturing the cardiac rhythm during symptoms is central to diagnosing suspected arrhythmias.
Recording during symptoms
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A 12-lead electrocardiogram (ECG) taken during symptoms* is usually diagnostic.
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When arrhythmias are intermittent and the resting ECG is normal, ambulatory or patient-activated ECG recording should be used to try to capture the abnormal rhythm.
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Many smart watches can record a single-lead ECG and provide a useful adjunct in clinical practice.