Pharmacologic therapy with flecainide for asymptomatic Wolff–Parkinson–White syndrome in an infant with severe left ventricular dyssynchrony

Some asymptomatic patients with Wolff–Parkinson–White syndrome have severe left ventricular dyssynchrony and dysfunction. We describe a patient who was given a diagnosis of Wolff–Parkinson–White syndrome in infancy and had a complete response to pharmacologic therapy with flecainide. Our findings suggest that flecainide is a suitable resynchronisation therapy for such infants.