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. 2013 Nov 20;1:39. doi: 10.3389/fped.2013.00039

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Copyright © 2013 Bhuiyan, Al-Shahrani, Al-Aama, Wilde and Momenah.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Electrocardiogram recordings from patients with LQTS1, LQTS2, and LQTS3. (A) 12-lead ECG of an 18-year-old male with a KCNQ1 mutation. The QT interval is prolonged (QTc = ±500 ms). The ST segment has a broad base and relatively large amplitude. Conduction interval is normal (standard calibration). (B) 12-lead ECG of a 14-year-old girl with a KCNH2 mutation. The QT interval is prolonged (QTc ± 520 ms). The ST segment is notched in lead V3 and has relatively low amplitude in the extremity leads. Conduction interval is normal (standard calibration). (C) 12-lead ECG of a 12-year-old boy with a SCN5A mutation. The QT interval is prolonged (QTc ± 600 ms). The ST segment has a long (almost) iso-electric segment with a large, sharp, and narrow T wave. Conduction interval is normal (standard calibration).