We performed transesophageal electric cardiac stimulations (TEECS) in order to restore sinus rhythm in 69 patients with isolated non-valvular atrial flutter with ECG FF interval 180–219 ms due to ischemic heart
disease (n=37) and myocardial fibrosis (n=32). Arterial hypertension was diagnosed in 34 (49.3 %) patients. Mean arrhythmic anamnesis constituted 3.1 years, with mean present episode duration of 14.1±2.1 days. In
order to evaluate the role of preliminary antiarrhythmic therapy (AAT) all patients were divided into two groups: in group 1 (n=32) cardioversion was conducted without preliminary AAT, in group 2 (n=37) patients were
administered antiarrhythmic medications (AAM): amiodarone (70.3 %), its combinations with other AAM (16.2 %), AAM of class I (Vaughan Williams) (5.4 %) and their combinations with atrioventricular conduction
blockers (8.1 %). Efficacy of TEECS constituted 96.9 % in the patients of group 1 and 100 % in the patients of group 2 (р>0,05). Thus, administration of AAM before cardioversion in the patients with such frequency
characteristics is not justified.