Objective: The clinical, subclinical and electrophysiology of patients with typical atrial flutter (AFL) were evaluated. -Subject and Method: 11 patients with typical atrial flutter (6 males, mean age: 64 +/- 9 years) were included in a cross, descriptive study. Clinical and subclinical characteristics were collected. Electrophysiology were done for all patients according to indication of AHA guideline 2003. Result and conclusion: Percentage of heart failure, mitral valve replacement, tricuspid valve repairment and previous atrial flutter ablation took up 18.2 percent.45.4 percent patients were presented with atrial fibrillation. Atria: ventricular response 2:1 took up 63.7 percent. Beta blocker was used in 91.8 percent patients and cordarone was used in 72.7
45.5 percent patients were kept on 2 drugs. For atrial flutter-fibrillation patients, 2 rate-control drugs were used in 80 percent, which is higher than in group with lone atrial flutter (16.6 percent). Lateral right atrium activation was counterclockwise in all patients. Mean atrial flutter cycle length was of 244.2 +/- 43.7 (ms). Mean atrial flutter cycle length in lone-atrial flutter patients (240.2 +/- 38.7 ms) was higher than in patients with atrial flutter-fibrillation (220.3 +/- 25.6 ms). During electrophysiology studying, atrial fibrillation occurred in 16.7 percent lone-atrial flutter patients.