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Twelve-lead ECG tracings of three young symptomatic adults with atrioventricular block requiring pacemaker implantation. Panel A: patient (Pt #5) with a variant of uncertain significance of SCN5A gene had a documented long-QT interval and intermittent atrioventricular block. Panel B: patient with a pathogenic variant of PKP2 (Pt #12). Panel C: ajmaline-induced BrS patient (Pt #2) with negative genetic test.
