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The long QT syndrome (LQTS) is a disorder of myocardial repolarization characterized by a prolonged QT interval on the electrocardiogram (ECG). This syndrome is associated with an increased risk of polymorphic ventricular tachycardia, a characteristic life-threatening cardiac arrhythmia also known as torsades de pointes. A rate related corrected QT interval (QTc) can be calculated as QT/√RR and normally is ≤0.44s. Some references given QTc upper normal limits as 0.43s in men and 0.45s indoi:10.18535/ijmsci/v8i04.01 fatcat:4dd2hdqntzh5xpgpogsuphzzxu