Catheter Ablation for Atrial Fibrillation in Preserved Ejection Fraction

Inclusion Criteria: * Left ventricular ejection fraction ≥50% * Scheduled for catheter ablation of AF Exclusion Criteria: * Significant valvular heart disease * Coronary artery disease with \>70% stenoses or necessary coronary Intervention at time of recruitment * Coronary intervention 60 days before recruitment * Coronary bypass surgery 90 days before recruitment * Cardiomyopathy or cardiac storage disease (e.g. amyloidosis) * Reduced left ventricular ejection fraction * Pericardiac disease * Significant pulmonary hypertension * Chronic obstructive pulmonary disease with home-oxygen-therapy, oral steroids, hospitalization due to exacerbations during the last 12 months before recruitment, or suspected severe pulmonary condition based on clinical evaluation * Other non-cardiac conditions associated with limited physical capacity (adipositas permagna, severe anemia) * Pregnancy * Other limitations for adequate performance of stress echocardiography (e.g. orthopedic reasons)