Ablation of the cavotricuspid isthmus (CTI) in the right atrium is currently the therapy of
choice for the treatment of typical atrial flutter (3,4). It is a curative approach and has a
high success rate (5). It has been recognized that patients with typical atrial flutter often
complain of atrial fibrillation (1,2). Current clinical and experimental studies confirm the
close relationship between atrial flutter (AFL) and atrial fibrillation (AF) and raise a
question, if both arrhythmias are different forms of a common electrical phenomenon with
atrial fibrillation being the underlying clinical problem (6).