The object of study was to evaluate the manifestation of chronic inflammation in patients with atrial fibrillation, arterial hypertension, coronary artery disease and heart failure. Material and methods. 78 patients were examined; average age was 66,3 ± 1,0. The 1 group included 42 patients with permanent form of atrial fibrillation (AF), arterial hypertension (AH), coronary artery disease (CAD) and heart failure (HF). The 2 group consisted of 36 patients with AH, CAD, HF without heart rhythm disturbances. 15 practically healthy persons were included in control group. In all groups patients were comparative by age, sex and clinical manifestation. Blood plasma levels of high sensitivity C-reactive protein (hs-CRP), interleukin-1 (IL-1), interleukin-6 (IL-6), interleukin-10 (IL-10) were measured in the patients of the 1 and 2 groups as well as control group. 12-lead electrocardiography (ECG), 24-hour monitoring of electrocardiogram and blood pressure, transthoracic echocardiography (TTE) were performed for all patients. Results. In the patients of 1 group the significant increase of blood plasma levels of hs-CRP (5,04 ± 0,31 mg/L vs 2,98 ± 0,09 mg/L, р = 0,001), ІL-1 (12,34 ± 1,35 pg/mL vs 3,48 ± 0,46 pg/mL, р = 0,001), ІL-6 (10,27 ± 0,93 pg/ mL vs 5,04 ± 0,36 pg/mL, р = 0,002) were revealed in comparison with control group. In the patients of 2 group the significant increase of blood plasma levels of hs-CRP (4,11 ± 0,35 mg/L vs 2,98 ± 0,09 mg/L, р = 0,05), IL-1 (8,77 ± 1,44 pg/mL vs 3,48 ± 0,46 pg/mL, р = 0,02), ІL-6 (8,18 ± 0,77 pg/mL vs 5,04 ± 0,36 pg/mL, р = 0,01) were revealed in comparison with control group. In the patients of 1 group the tendency to increase of blood plasma levels of hs-CRP (5,04 ± 0,31 mg/L vs 4,11 ± 0,35 mg/L, р = 0,09), ІL-1 (12,34 ± 1,35 pg/mL vs 8,77 ± 1,44 pg/mL, р = 0,07), ІL-6 (10,27 ± 0,93 pg/mL vs 8,18 ± 0,77 pg/mL, р = 0,09) were revealed in comparison with 2 group. In the patients of 1 group the significant increase of blood plasma level of IL-10 (29,01 ± 2,59 pg/mL vs 15,43 ± 1,80 pg/mL, р = 0,001) was revealed in comparison with 2 group as well as between 1 group and control group (29,01 ± 2,59 pg/mL vs 11,14 ± 1,58 pg/mL, p = 0,001). In the patients of 2 group the tendency to increase level of IL-10 (15,43 ± 1,80 pg/mL vs 11,14 ± 1,58 pg/mL, р = 0,13) was revealed in comparison with control group. Conclusion. In patients with permanent form of AF, AH, CAD and HF the significant increase of blood plasma levels of hs-CRP, IL-1, IL-6 and IL-10 were revealed; that indicates the presence of chronic inflammation. Consequently, the main strategy of treatment of patients with a permanent form of AF, AH, CAD and HF is to suppress the activity of chronic inflammation, as one of the leading pathogenetic mechanisms of progression of the atherosclerotic process and heart rhythm disturbances, with obligatory using of the inhibitors of the renin-angiotensin-aldosterone system and statins.