The prognosis of patients with chronic heart failure, depending on adherence to observation in a specialized heart failure treatment center

Abstract

Actuality. The risk of death of patients with chronic heart failure (CHF) after acute decompensation of heart failure (ADHF) is directly related to the quality of the treatment of CHF after discharge from the hospital. In order to achieve the maximum effect of therapy in patients with CHF, experts in Europe and the USA recommend the creation of centers of specialized medical care for patients with CHF. Objective: to determine the risks of general, cardiovascular mortality and death from ADHF in patients with CHF during two years of observation, depending on their adherence to observation in a specialized center for the treatment of chronic heart failure (center CHF).Materials and methods. The study consistently included 942 patients with CHF after ADHF. The adherence of patients to follow up in center CHF was analyzed and 4 groups were distinguished: group 1 (n = 313) included patients who were observed continuously for two years; group 2 (n = 382) included patients who, after discharge, had never been observed in the center CHF; group 3 (n = 197) consisted of patients who were monitored at center CHF during the first year and then discontinued, and group 4 (n = 49) united patients who, when included in the study, abandoned observation, but after a year began to be constantly observed during the second year center CHF.Results.Statistically significant differences in age were registered only between groups 1 and 2 (69.6+9.9 and 71.8+11 years, respectively, р1/2=0.006). The overall mortality over the 2 years of follow-up was significantly higher in group 2 (32.4%) versus group 1 (1.2%, OR=3.8, 95% CI 2.5-5.7; p1/2<0.001 ); compared with group 3 (9.1%, OR=4.8, 95% CI 2.8-8.1; p2/3<0.001) and group 4 (8,2%, OR = 5.4, 95% CI 1.9-15.3; p2/4=0.0005). Cardiovascular mortality (CVM) for 2 years of follow-up was significantly higher in group 2 versus group 1 (8.1% and 1.3% of cases, OR=6.8, 95% CI 2.4-19.5; p1/2<0.001), as well as in comparison with group 3 (CVM 3% for 2 years, OR=2.8, 95% CI 1.1-6.8; p2/3=0.02). CVM in group 4 (6.1%) was 5 times higher in comparison with group 1 (OR=5.0, 95% CI 1.1-23.2; p1/4=0.02). The risks of death from ADHF over the 2 years of follow-up were significantly higher in group 2 (16.4%) compared with all groups: with group 1 (6.4%) OR=2.9, 95% CI 1.7-4, 9, p1/2<0.001; with group 3 (5.1%) OR=3.7, 95% CI 1.8-7.3, p2/3<0.001; and with group 4 (2%) OR=9.5, 95% CI 1.3-69.7, p2/4= 0.008. The combined endpoint (CVM and death from ADHF in 2 years of follow-up) was also significantly higher in group 2 (24.5%) compared with all compared groups: group 1 (7.7%), OR=3.9, 95% CI 2.4-6.3, p1/2<0.001; group 3 (8.1%), OR=3.7, 95% CI 2.1-6.5, p2/3<0.001; and group 4 (8.2%), OR=3.7, 95% CI 1.3-10.4; p2/4=0.01.Conclusion.Surveillance of patients with CHF after an episode of ADHF in a specialized center CHF, both for a long time (two years) and partially during the first year of observation, reduces the risk of all-cause death, CVM and death from ADHF.