Catheter Evaluation for Endocardial Ablation in Patients With Typical Atrial Flutter

Inclusion Criteria: Two symptomatic episodes of typical atrial flutter (or chronic atrial flutter) during the one-year period prior to enrollment. This may include typical AFL occurring while receiving anti-arrhythmic drug (AAD) therapy for non-AFL tachyarrhythmia, including atrial fibrillation. At least one episode of typical (clockwise or counterclockwise) atrial flutter documented by 12 lead electrocardiogram (ECG), Holter monitor, transtelephonic event monitor, telemetry strip, or implanted device within 6 months prior to enrollment. 18 years of age or older Informed consent Exclusion Criteria: Intracardiac thrombus Uncontrolled heart failure, or New York Heart Association (NYHA) class III or IV heart failure Women who are pregnant Cardiac surgery (ventriculotomy or atriotomy) within the past two months Intra-atrial thrombus, tumor, or other abnormality that precludes catheter introduction and placement Unstable angina or acute myocardial infarction within 3 months Awaiting cardiac transplantation Heart disease in which corrective surgery is anticipated within 6 months Presence of condition that precludes appropriate vascular access Enrolled in any investigational device exemption (IDE) investigating study for a device or drug High risk for non-compliance with the protocol (e.g., inaccessible for follow-up by the investigator or patient's physician) Radio frequency (RF) ablation for typical atrial flutter within the past 2 months