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A 24-year-old female patient’s electrocardiographies showed marked prolongation of the QT interval and subsequent polymorphic ventricular tachycardia (PMVT) (top). Her genetic testing result was a positive genotype of potassium voltage-gated channel subfamily H member 2 (KCNH2). She was diagnosed with long QT syndrome (LQTS) type 2. The mechanism of lethal ventricular tachyarrhythmia in LQTS (bottom). PVC, premature ventricular contraction.
