1Research Institute of Cardiology, Tomsk, Russia; 2Novosibirsk State Medical University, Ministry of Health of Russia, Novosibirsk, Russia Aim. To reveal the specific features of Fas ligand-mediated ischemic myocardial remodeling and those of chronic heart failure (CHF) development during a 12-month prospective follow-up. Subjects and methods. A total of 94 patients with ischemic CHF were examined and divided into 3 groups according to NYHA Functional Class (FC): 1) FC II CHF in 35 patients; 2) FC III CHF in 31; 3) FC IV CHF in 28. According to the results of the 12-month follow-up, the patients were randomized into 2 groups: A) 49 patients with a favorable course of cardiovascular disease and B) 45 patients with its poor course. Serum soluble Fas ligand (sFas-L) levels were measured by enzyme immunoassay. Results. In the patients with CHF, the baseline sFas-L levels substantially exceeded that in the control group by 3-6 times (p<0.01). In the men with the poor course of CHF, the baseline serum sFAS-L levels (85.94±4.14 pg/ml) were significantly higher than that in the favorable CHF group (107.33±5.13 pg/ml; р=0.0015). ROC analysis of the sensitivity and specificity of cardiovascular risk stratification according to sFAS-L levels revealed the high prognostic value of this marker - ROC-Area±S.E. was 0.75±0.05 (95% confidence interval, 0.60 to 0.81; p=0.0005). There was a statistically significant moderate correlation of left ventricular (LV) ejection fraction with sFAS-L concentrations and a moderate direct correlation between serum sFAS-L concentrations and LV remodeling parameters. Conclusion. The serum level of sFas-L determines the development of ischemic LV remodeling and the severity of CHF, by increasing in proportion to the degree of disease progression. The determination of serum sFas-L levels assists in objectively estimating the severity of apoptosis and may be an important prognostic test to assess the course of CHF in patients with coronary heart disease.