Abstract Background The spontaneous type 1 ECG pattern (ECG-T1) is diagnostic of Brugada syndrome (BrS) and implies an increased arrhythmic risk, while pharmacologically-induced ECG-T1 without other clinical features only makes the diagnosis possible, according to ESC guidelines. Given the dynamic nature of the ECG patterns in BrS, tools to increase the detection of ECG-T1 are needed to improve BrS diagnosis and adequately assess the arrhythmic risk. Purpose To assess the diagnostic yield of a smartphone-operated, 6-lead device (6L-mobile ECG) in BrS. Methods Eighteen patients with spontaneous or drug-induced ECG-T1 (Figure 1-a), 18 patients with type 2 ECG pattern (ECG-T2, figure 2-a) and 18 controls were included. A 12-lead ECG and a 6L-mobile ECG were obtained by placing leads V1 and V2 in 2nd, 3rd and 4th intercostal space (ICS). The 6L-mobile ECG was placed with the 2 frontal electrodes in contact with the patients’ chest. Each 12-lead ECG and 6L-mobile ECG recording was classified as ECG-T1, ECG-T2 or non-diagnostic (ND), by considering the lead/ICS with the most evident pattern for analysis. Results Sixteen 6L-mobile ECG recordings were diagnostic of ECG-T1 (figure 1-b), 18 of ECG-T2 (figure 2-b) and 20 were ND. Unipolar 6-L mobile ECG recordings at any ICS had a 77% sensitivity and 94% specificity for the diagnosis of ECG-T1 (NPV 89%, PPV 88%, p<0.0001). For ECG-T2, the 6L-mobile ECG showed a 89% sensitivity and 94% specificity (NPV 94%; PPV 89%, p<0.0001). Conclusions The 6-L mobile ECG device showed a high diagnostic yield for type 1 and type 2 ECG patterns and may emerge as a new diagnostic and monitoring tool in BrS.
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