[Heart rate variability in patients with paroxysmal atrial fibrillation of various etiologies].

Heart rate variability (HRV) was assessed on 24 hour Holter ECG recordings from 32 healthy persons and 54 patients with paroxysmal atrial fibrillation (AF) of different etiology (hypertension, ischemic heart disease, rheumatic mitral valve disease, idiopathic AF) aged 45-73 years. Nocturnal, diurnal and 24 hour HRV was measured. Time and frequency domain HRV measures were lower in patients with AF and underlying heart disease compared with healthy persons and for most of the parameters with patients with idiopathic AF (p<0,05). Patients with idiopathic AF compared with healthy persons had higher values of high frequency power during nighttime (p<0.05), what reflected activation of parasympathetic nervous system in this category of patients.

[Comparative effectiveness of different methods of diagnosis and correction of impaired portal circulation]. / Sravnitel'naia éffektivnost' razlichnykh metodov diagnostiki i korrektsii narushenii portal'nogo krovoobrashcheniia.

The diagnostic effectiveness of X-ray radionuclide and ultrasound determination of portal blood flow and the impact of different treatments on the blood flow were evaluated in 76 patients with hepatic cirrhosis. The treatment regimens were used propranolol (Group 1), isosorbide-5-mononitrate (monosan) (Group 2), and a combined therapy with propranolol in combination with diuretics and a course of intravenous laser irradiation (Group 3). In terms of both clinical and laboratory parameters and the status of portal circulation, the highest effect was observed in the patients receiving the combined therapy.

[Effect of radio frequency catheter ablation on spectral parameters of heart rate variability in patients with paroxysmal supraventricular tachyarrhythmias]. / Vliianie radiochastotnoi kateternoi ablatsii na spektral'nye pokazateli variabel'nosti ritma serdtsa u bol'nykh s paroksizmal'nymi nadzheludochkovymi takhiaritmiiami.

AIM: To assess effect of radio frequency catheter ablation (RFCA) on heart rate variability (HRV) in patients with supraventricular tachyarrhythmias (SVT). METHODS: Spectral analysis of HRV on 5-minute ECG strips was carried out in 19 patients with SVT before and 2 days after RFCA. RESULTS: Both total and high frequency power significantly decreased (p<0,05) after RFCA in supine and orthostatic positions. Significant decrease of low frequency power occurred after RFCA in orthostatic position. CONCLUSION: In patients with SVT RFCA alters autonomic regulation of chronotropic function of the heart. Sympathetic and parasympathetic influences on the chronotropic function of the heart are attenuated in early period after the procedure.