Aim. To assess the effectiveness of Mildronate in the prevention of arrhythmias during the perioperative period of open cholecystectomy under intravenous multicomponent anesthesia.Material and methods. In total, 69 patients were divided into 3 groups: with concomitant coronary heart disease (CHD), with essential arterial hypertension (EAH), or without concomitant cardiovascular disease (CVD). Each group was divided into a control subgroup (total n=36) receiving conventional treatment and a main subgroup (total n=33) additionally receiving Mildronate (500 mg twice a day intravenously: 24 hour before the operation, during premedication, during early postanesthetic period, and for 2 days after the operation). Arrhythmic episodes were registered at Holter ECG monitoring for 4 days: 24 hours before the operation; 24 hours of the operation; and 48 hours after the operation. The monitoring period was divided into 6 intervals: 1 — preoperation; 2–6 hours before the operation; 3 — anesthesia start; 4 — anesthesia maintenance; 5 — anesthesia finish; and 6 — second day after the operation.Results. Cardiac arrhythmias were registered not only among patients with EAH and CHD, but also with patients without concomitant CVD.Conclusion. Mildronate therapy reduced the number of arrhythmic episodes at different stages of perioperative period, particularly in the anesthesia start, finish, and maintenance periods among patients with CHD and EAH, as well as among CVD-free patients.

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Objective. To evaluate the status of QT interval derivatives in patients with chronic IHD during different perioperative periods of planned open cholecystectomy under general anaesthesia and to determine the possibility of using meldonium for prevention of QT interval dysfunction. Materials and methods. Patients with the diagnosis of cholelithiasis with verified forms of chronic CHD (angina I and II AC) were divided into 2 groups: Group 1 was the control group with conventional perioperative therapy, and Group 2 was the main group with additional meldonium. The dynamics of the corrected QT interval (QTc) and the variance of the QT interval (DQT) were assessed. Analysis was performed by means of daily Holter ECG monitoring, in which 6 time periods were singled out: 1 - the day before the operation (18 hours); 2 - hours before the operation; 3 - induction into anesthesia; 4 - maintenance of anesthesia; 5 - withdrawal from anesthesia; 6 - the day 2 after the operation (18 hours). Results. The increase in QTc and DQT values during induction, maintenance and withdrawal from anesthesia was detected only in the control group. The inclusion of meldonium in perioperative therapy in patients with CHD was accompanied by the absence of QTc interval prolongation and an increase in DQT values in the periods of induction, exit and maintenance of anaesthesia. Conclusion. The perioperative period was accompanied by a prolongation of the QTc interval and an increase in DQT values in the group receiving conventional therapy. The inclusion of meldonium was accompanied by no increase in QTc and DQT during most follow-up periods.