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The QT interval
(Left) Normal electrocardiogram. (Right) Prolonged QT interval. Reprinted with permission from Trinkley KE, Page RL II, Lien H, et al. QT interval prolongation and the risk of torsades de pointes: essentials for clinicians. Curr Med Res Opin 2013;29:1719-26. Publisher: Taylor & Francis, Ltd, www.tandfonline.com.
