A long QT interval can be congenital or acquired. The importance of measuring the QT interval is related to the fact that, if prolonged, it may cause dangerous arrhythmias or even sudden cardiac death 1. It expresses ventricular depolarization and repolarization. The QT interval is measured from the beginning of QRS to the end of the T-wave. These results could have an important clinical impact when frequent QT interval monitoring is required. These data show that a smartwatch can feasibly and reliably assess QT interval. The reliability of the QTc measurements between standard and smartwatch ECG was also demonstrated with a Bland–Altman analysis using different formulas. There was agreement among the QT intervals of I, II, and V2 leads and the QT mean using the smartwatch and the standard ECG with Spearman’s correlations of 0.886 0.881 0.793 and 0.914 (p < 0.001), respectively. The V2 lead was recorded with the smartwatch in the fourth intercostal space left parasternal with the right index finger on the crown. Lead II was obtained with the smartwatch on the left lower abdomen and the right index finger on the crown. Lead I was recorded with the smartwatch on the left wrist and the right index finger on the crown. I, II, and V2 leads were obtained after recording a standard 12-lead ECG. One hundred nineteen patients admitted to our Cardiology Division were studied. The present study aimed to assess the feasibility and reliability of evaluating the QT interval in lead I, lead II, and V2 lead using a commercially available Apple Watch. Smartwatches are becoming more popular and are increasingly used for monitoring human health. The inherited and acquired long QT is a risk marker for potential serious cardiac arrhythmias and sudden cardiac death.
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