text: [Theory and practical approaches in catheter ablation of atrial flutter].
  Atrial flutter can be understood as atrial tachycardia due to a single intraatrial macroreentrant circuit that is determined by fixed or functional boundaries. In various types of atrial flutter, radiofrequency ablation became an established curative therapy. During the course of an ablation procedure, initially, the reentrant circuit has to be determined, e.g. by activation and entrainment mapping. Subsequently, the boundaries have to be identified. By connecting two appropriate boundaries with a linear lesion, the intraatrial reentrant circuit can be inhibited. Finally, it should be proven that the linear lesion results in a complete line of conduction block. Doing so, the acute and long-term results of atrial flutter ablation are comparable to those of other supraventricular tachycardias.