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Original Article
The corrected QT (QTc) prolongation in hyperthyroidism and the association of thyroid hormone with the QTc interval
Ye Seung Lee, Joong Wan Choi, Eun Ju Bae, Won Il Park, Hong Jin Lee, Phil Soo Oh
Clin Exp Pediatr. 2015;58(7):263-266.   Published online July 22, 2015
Purpose

Ventricular repolarization is assessed using the QT interval corrected by the heart rate (QTc) via an electrocardiogram (ECG). Prolonged QTc is associated with an increased risk of arrhythmias and cardiac mortality. As there have been few reports regarding the effects of hyperthyroidism on ventricular repolarization, we studied the association between serum free thyroxine (free T4 [fT4]) and thyroid stimulating hormone...

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