<qa>  What is the NAVISTAR THERMOCOOL irrigated tip catheterThis trial compares the safety and effectiveness of catheter ablation for PAF with antiarrhythmic drug therapy. The investigational catheter being studied is the NAVISTAR THERMOCOOL irrigated-tip catheter. At the time of this study, the NAVISTAR THERMOCOOL catheter was FDA-approved for commercial distribution in the U.S. for treating patients with Type I atrial flutter and drug refractory monomorphic ventricular tachycardia post myocardial infarction. The catheter was approved for use in Europe for endocardial ablation for treating cardiac arrhythmias. 