Inclusion Criteria:  Patients with symptomatic atrial fibrillation scheduled for pulmonary vein isolation Class I or class IIa indication for pulmonary vein isolation by current guidelines Age ≥ 18 years Written informed consent  Exclusion Criteria:  History of previous pulmonary vein isolation or surgical treatment of atrial fibrillation Reversible causes of atrial fibrillation (e. g. thyroid disorder, acute alcohol intoxication, recent major surgical procedures, trauma or acute infection) Moderate or severe valvular heart disease CHA2DS2-VASc-Score =0 (males) or 1 (females) or contraindication to oral anticoagulation Acute coronary syndrome, percutaneous coronary intervention, valve surgery or percutaneous intervention or cardiac bypass surgery and stroke within the last 3 months Reduced left ventricular ejection fraction < 35% Hypertrophic obstructive cardiomyopathy Medical conditions limiting the expected survival to < 1 year Participation in any other randomized controlled trial Women of childbearing potential without appropriate contraceptive measures (oral contraceptives, vaginal ring, intrauterine devices, implanon, injections, partner with vasectomy) pregnant woman or woman with desire for children Any condition that - in the opinion of the investigator - may prevent the subject from adhering to the study protocol (e.g. history of non-compliance, drug addiction) Subjects under legal supervision or guardianship Unable to give informed consent