Sarcopenia in patients with rheumatic musculoskeletal diseases

Abstract Aim To investigate the impact of high‐dose glucocorticoid therapy on sarcopenia in hospitalized patients with rheumatic musculoskeletal diseases (RMDs). Methods We included patients with RMDs who were hospitalized between 2020 and 2022 for remission induction treatment and collected information on skeletal mass index (SMI) before high‐dose glucocorticoid therapy and 1 month later. We divided the patients into 2 groups according to the progression of sarcopenia, defined as a >10% decrease in SMI, and compared their clinical characteristics. Results Forty‐nine patients were included in this analysis. The mean age was 53.3 years, 73.5% were female, and the mean SMI was 5.3 kg/m 2 . Before treatment, 83.7% had already met the definition of sarcopenia, and 57.1% experienced further sarcopenia progression after 1 month of high‐dose glucocorticoid treatment. Patients with sarcopenia progression were predominantly male ( P = 0.025), had a higher body weight ( P = 0.048), and showed a higher SMI than those without sarcopenia at baseline ( P = 0.008). Multivariable analysis revealed that body weight increase from 0 to week 1 of high‐dose glucocorticoid treatment was associated with sarcopenia progression (odds ratio: 0.22, 95% CI: 0.04–0.61, P = 0.007) with a cut‐off of −1.8 kg. During a mean observation period of 30.2 days, the incidence of infection was significantly higher in patients with progressive sarcopenia ( P = 0.042). Conclusions One‐month hospitalization with high‐dose glucocorticoid therapy is associated with sarcopenia progression in patients with RMDs. An early decrease in body weight can be used to predict muscle volume loss.