Aim. To assess the prevalence of sarcopenia in rheumatological patients. Materials and methods. 317 patients with rheumatological pathology were examined, among them 201 women and 116 men, the age of patients ranged from 21 to 58 years, the average age at the time of inclusion of patients in the study was 41.17.3 years. Sarcopenia was diagnosed using the method recommended by The European Working Group on Sarcopenia in Older People 2. Results. The frequency of occurrence of a decrease in the appendicular skeletal muscle mass to the appendicular skeletal muscle mass index was 31.2% (99 patients), a decrease in muscle strength according to the wrist dynamometry was observed in 44.5% (141) patients, low skeletal muscle performance according to the results NIH Toolbox 4 Meter Walk Gait Speed Test in 42.8% (135) patients. The prevalence of suspected sarcopenia (probable sarcopenia) was 13.3% (42 patients) and sarcopenia, including severe 31.2% (99) patients. Statistically significant differences were obtained between groups of patients depending on the duration of rheumatological disease and the prevalence of sarcopenia (2=19.328; p=0.001). Conclusion. Sarcopenia occurs in a third of hospitalized rheumatological patients.

The aim. To conduct a comparative analysis of the effectiveness of methods for assessing lean body mass in haemodialysis patients. Patients and methods. A total of 317 patients receiving treatment with programmatic bicarbonate haemodialysis in 9 haemodialysis centers in 5 regions of the European part of the Russian Federation were examined for 8.2 ± 5.1 years, among them 171 women and 146 men, the average age was 57.1 ± 11.3 years. Dual-energy X-ray absorptiometry and bioimpedancemetry were used to assess lean body mass. Results. The results of determining the total lean body mass obtained from the results of dual-energy X-ray absorptiometry and bioimpedancemetry were compared using the Bland-Altman method. The correlation coefficient between the indicators was r = 0.994, p < 0.0001, delta (M ± σ) was –0.48 ± 0.91 kg, CI 95% (–0.71)–(–0.26) kg. Conclusion. Dual-energy X-ray absorptiometry has no significant advantages compared with bioimpedancemetry when evaluating lean body mass in haemodialysis patients.