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12-lead ECG (while off medications) of a phospholamban founder mutation carrier (c.40_42delAGA, p.Arg14del). The ECG shows sinus rhythm with right axis deviation, low voltages (<0.5 mV in standard leads), and characteristic negative T waves in left precordial leads from V3-6. The terminal activation duration (from the nadir of the S wave to the end of all depolarisation deflections) is 60 ms and therefore prolonged in lead V1 (vertical black lines)
