To study the quality of tissue contact of the ablation electrode during the catheter ablation of atrial fibrillation based on the experience of operating electrophysiologist, 52 patients aged 53.1±4.6 years (20 men and 32 women) with paroxysmal (n=18) or persistent AF (n=34) were examined and treated.

To assess the dynamics of an impact of optimization on interventricular delay based on the QRS complex width on the hemodynamics, 120 patients with the sinus rhythm and CRT systems implanted according to the indications by the national guidelines were examined.

To assess the quality of life of patients with atrialfibrillation depending on the treatment strategy chosen and followup strategy in an out-patient setting, 146patients were examined.

Thus, post-operative AF in elderly patients is characterized by a high prevalence as compared with middle-aged subjects. Predictors of the arrhythmia were age, antero-posterior LA size, left ventricular ejection fraction, aortic crossclamping time, and time of ischemia.

To assess the outcomes of the simultaneous the Ross procedure and surgical treatment of atrialfibrillation, 16 patients aged 50.5 years [45-59 years] were examined and surgically treated.

To assess the clinical effect and dynamics of echocardiographic indices of diastolic and systolic left ventricular function after replacement of a pacemaker to a system for cardiac resynchronization therapy in patients with preserved left ventricular ejection fraction and symptoms of chronic heart failure at the background ofpermanent right ventricular pacing after radiofrequency ablation of atrioventricular node, three patients were examined.

To analyze anatomical mapping techniques and explore potentialities of non-invasive surface epi- and endocardial mapping in the diagnosis of complete left ventricular myocardial dyssynchrony, 41 patients with complete left bundle branch block were examined.

The data are considered on the long QT interval syndrome as a potential predictor of adverse outcome in patients with the syndrome of obstructive sleep apnea/hypopnea.

A case report is given of a neonate with a combination of congenital long QT interval syndrome, atrioventricular block, and polymorphic ventricular tachycardia.