Abstract
A 22-year-old man with no previous medical history presented with first in his life episode of atrial fibrillation (AF). The biochemistry blood examinations were within normal range, including thyroid hormones and electrolyte levels. The patient was converted to sinus rhythm with intravenous infusions of metoprolol, potassium and magnesium. During sinus rhythm QT interval was 280ms in aVL and 330ms in V2–V4 leads (Fig. 1). Holter monitoring showed sinus rhythm, 35 PVCs and 2 ventricular pairs. The echocardiogram, except asymmetrical IVS hypertrophy (18mm), was normal.
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