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(A) ECG taken on the 8th hospital day. QT and QTc intervals were 350 and 440 ms, respectively. (B) ECG taken on the 9th hospital day showing spontaneous onset of polymorphic ventricular tachycardia by the short-long-short sequences. Arrows indicate the premature ventricular contractions. QT and QTc intervals were 350 and 450 ms, respectively. ECG, electrocardiogram.
