35. The purpose of a study by Kay et al. (A-35) was to determine the safety and efficacy of radiofrequency ablation as definitive therapy for primary atrial tachycardias. Subjects were 15 consecutive patients with primary atrial arrhythmias that were refractory to medical management. The authors conclude that radiofrequency catheter ablation appears to be a safe and effective technique for the treatment of primary atrial arrhythmias that are refractory to antiarrhythmic medications. What was the target population? The sampled population?