Non-invasive Differentiation of Supraventricular Tachyarrhythmia

Inclusion Criteria: * Scheduled for ablation of a supraventricular tachycardia (atrial fibrillation, typical atrial flutter, AV nodal reentry tachycardia, accessory pathway) * majority Exclusion Criteria: * Unstable patient with need for intensive medical care * Lack of language skills or limited cognitive abilities that prevent a differentiated anamnesis and information. Exclusion criteria for study section Questionnaire: \- Competing clinically present arrhythmias, including relevant supra- and ventricular extrasystole (\>5%/die). Exclusion criteria for study section Extended high-resolution ECG: * Previous electrophysiological ablation at the same site for atrial fibrillation. * Relevant supra- and ventricular extrasystole (\>5%/die). * Other clinically present arrhythmias are not excluded if they can be sequentially triggered and ablated (e.g. atrial fibrillation and atrial flutter). Since separate detection is possible with the high-resolution ECG. * Implanted active electrical device (e.g. pacemaker, defibrillator, deep brain pacemaker) * Allergy to measuring electrodes