To prove if the success rate of curative treatment of atrial fibrillation in left atrial circumferential pulmonary vein ablation is higher by using a steerable transseptal introducer giving access to the left atrium then by using a conventionally introducer with fixed curve.

To prove if the success rate of curative treatment of atrial fibrillation in left atrial circumferential pulmonary vein ablation is higher by using a steerable transseptal introducer giving access to the left atrium then by using a conventionally introducer with fixed curve; in patients with paroxysmal or persistent symptomatic Atrial Fibrillation.

Primary Endpoint: rate of patients in stable sinus rhythm at 6 Month Follow Up

Inclusion Criteria:

• Paroxysmal or persistent symptomatic atrial fibrillation
• Resistant to at least 1 anti arrhythmic drug
• Left atrial diameter less then 60 mm (TTE, parasternal)
• Atrial fibrillation documented by ECG
• Patient is willing and available to perform all Follow Ups

Exclusion Criteria:

• Permanent atrial fibrillation
• Pre existing left atrial fibrillation ablation
• Atrial fibrillation due to reversible cause
• Known intracardiac or other thrombi
• Pregnancy
• Women of child bearing potential without negative pregnancy test within 48 hours prior to ablation
• Contraindication for anticoagulation