Inclusion Criteria:  1. Paroxysmal atrial fibrillation  Exclusion Criteria:  Sick sinus syndrome 2nd and 3rd degree AV block (without pacemaker), bifascicular block or prolonged (PR>300ms) 1st degree AV block History of vagotomy Recurrent vasovagal syncope Left ventricular ejection fraction < 40% Significant valvular disorder (i.e., prosthetic valve or hemodynamic significant valvular diseases) Recent stroke (< 3 months) Myocardial infarction or hospitalization for heart failure (< 3 months) Severe heart failure (NYHA Class IV) End stage kidney disease on dialysis Pregnancy