It has been reported that the presence of intermittent pre-excitation indicates low risk of rapid conduction via the accessory pathway in atrial fibrillation. We report a case of a 10-year-old boy with a history of intermittent pre-excitation who presented with atrial fibrillation with very rapid conduction.
Keywords: Pre-excitation; Wolff–Parkinson–White; atrial fibrillation; supraventricular tachycardia.