We performed 225 transesophageal electric cardiac stimulation (TEECS) procedures in order to restore sinus rhythm in patients with isolated atrial flutter (AF) type I and IHD (n=161) or myocardiofibrosis (n=64). Arterial hypertension was present in 157 patients. Arrhythmia anamnesis constituted in average 7,1 years, with present arrhythmic episode mean duration of 25.3±3.6 days. No pharmacologic antiarrhythmic treatment (AAT) was administered before TEECS. Depending on FF duration all patients were divided into two groups: group 1 (n=75) – below 220 ms, group 2 (n=108) – 220–259 ms, and group 3 (n=42) – ≥ 260 ms. Significant reverse
correlation was found between AF rate and patient’s age, IHD symptoms worsening, heart conduction abnormalities, chronic pulmonary pathology and TEECS efficacy. In the patients with AF rate below 220 ms
procainamide was used significantly more often. At the same time in patients with AF rate above 260 ms AAT increases proarrhythmic risk, therefore AAT will be more useful and safe after transformation of AF into atrial
fibrillation using medications with short half-life (Vaughan Williams class I).