This is a randomized pilot study on the effect of oesophageal temperature monitoring on the esophageal thermal injury after left atrial ablation for the treatment of atrial fibrillation (AF).~Sixty patients with paroxysmal AF or persistent and without previous AF ablation with indication of AF ablation will be selected to be included at the study.~After informed consent, these patients will be randomized in 3 groups with different strategies of esophageal protection for radiofrequency application in the posterior wall of the left atrium, by randomization in a ratio of 1: 1: 1 between groups.~Group I: no esophageal temperature monitoring technique. Group II: monitoring of esophageal temperature during radiofrequency applications in the posterior wall of the left atrium, with unipolar thermometer.~Group III: oesophageal temperature monitoring during radiofrequency applications in the posterior wall of the left atrium, with a multipolar and self expandable thermometer.~The primary end point will be the incidence of esophageal lesions assessed by upper endoscopy that will be done in all patients.
It's a randomized pilot study to evaluate the incidence of esophageal thermal injury after left atrial ablation for the treatment of atrial fibrillation according to three different strategies of esophageal temperature monitoring.~These patients will be divided into 3 groups with different strategies of esophageal temperature monitoring: group 1 without monitoring, group 2 monitoring with single probe thermometer and group 3 monitoring with multi-probe thermometer.~The primary end point will be the incidence of esophageal lesions assessed by upper endoscopy.