Repetitive paroxysmal auricular tachycardia with defective intraventricular conduction in a 7-month-old infant

Repetitive paroxysmal tachycardia of auricular type with aberrant intraventricular conduction which simulated paroxysmal ventricular tachycardia is reported in an infant 7 months of age. Among the note-worthy features about the case were: (1) the bizarre ventricular complexes, (2) high and variable rate of discharge (up to 300 per minute) of the ectopic focus, (3) lack of evidence of ectopic auricular activity, (4) absence of sinus or extrasystolic beats between paroxysms, (5) increase in duration of the Q-T interval, and (6) development of persistent S-T-T segment abnormalities with restoration of normal sinus rhythm.