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