Long QT syndrome and short QT syndrome.

Abstract excerpt

The long QT syndrome (LQTS) is a genetic disorder characterized by prolongation of the QT interval in the electrocardiogram (ECG) and a propensity to torsades de pointes ventricular tachycardia frequently leading to syncope, cardiac arrest, or sudden death usually in young otherwise healthy individuals. The long QT syndrome is caused by mutations of predominantly potassium and sodium ion channel genes or...

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