Treatment with low-dose prednisolone is associated with altered body composition but no difference in bone mineral density in rheumatoid arthritis patients: a controlled cross-sectional study.

OBJECTIVES: To determine whether low-dose prednisolone affects body composition and bone mineral density (BMD) in patients with rheumatoid arthritis (RA), also considering inflammation and physical disability. METHODS: This cross-sectional study included 100 patients (50 women) with RA with a median (IQR) disease duration of 8 (4-15) years. Fifty patients had been treated with prednisolone (5-7.5 mg) for at least 2 years (the P-group) and 50 patients matched for gender and age had not (the NoP-group). Body composition and BMD were assessed by dual-energy X-ray absorptiometry (DXA). Disease activity (28-joint Disease Activity Score, DAS28) and physical disability (Health Assessment Questionnaire, HAQ) were assessed. RESULTS: The total patient group had increased fat mass (FM) and a high trunk:peripheral fat ratio, of which 38% had a fat free mass index (FFMI, kg/m²) below the 10th percentile of a reference population. The P-group had significantly higher FM but similar lean body mass (LBM) and BMD compared with the NoP-group. In multivariate analyses, treatment with prednisolone and a higher HAQ score were significantly and independently associated with higher FM but not with LBM. Higher C-reactive protein (CRP) was independently associated with lower LBM. Higher HAQ score and low weight were significantly and independently associated with lower BMD at femoral neck and lumbar spine. CONCLUSIONS: RA patients treated with low-dose prednisolone had significantly higher FM than patients without prednisolone, an effect that was independent of current inflammation. However, there was no association between prednisolone treatment and muscle mass or BMD. Thus, the net effect of prednisolone on body composition and bone is different in inflammatory diseases such as RA.

Cachexia in rheumatoid arthritis is associated with inflammatory activity, physical disability, and low bioavailable insulin-like growth factor.

OBJECTIVES: To examine the impact of inflammation, insulin-like growth factor (IGF-1) and its regulating binding protein (IGFBP-1) on lean body mass (LBM) in patients with rheumatoid arthritis (RA). METHODS: In 60 inpatients (50 women), inflammatory activity was measured by Disease Activity Score 28 (DAS28), C-reactive protein (CRP), and interleukin (IL)-6, and physical disability by the Health Assessment Questionnaire (HAQ). LBM was assessed by dual-energy X-ray absorptiometry (DXA) and fat free mass index (FFMI; kg/m(2)) and fat mass index (FMI; kg/m(2)) were calculated. RESULTS: Median age was 65 years and disease duration 13 years. Fifty per cent of the patients had FFMI below the 10th percentile of a reference population and 45% had FMI above the 90th percentile, corresponding to the condition known as rheumatoid cachexia (loss of muscle mass in the presence of stable or increased FM). DAS28, CRP, and IL-6 correlated negatively with LBM (p = 0.001, 0.001, and 0.018, respectively), as did HAQ (p = 0.001). Mean (confidence interval) IGF-1 was in the normal range, at 130 (116-143) microg/L. IGFBP-1 levels were elevated in patients (median 58 microg/L in women and 59 microg/L in men) compared with a normal population (33 microg/L in women and 24 microg/L in men). The ratio IGF-1/IGFBP-1, which reflects bioavailable IGF-1, was low (2.0 microg/L) and was positively correlated with LBM (p = 0.015). In multiple regression analysis, 42% of the LBM variance was explained by IGF-1/IGFBP-1, HAQ score, and DAS28. CONCLUSION: A large proportion of RA inpatients, mainly women, had rheumatoid cachexia. The muscle wasting was explained by inflammatory activity and physical disability as well as low bioavailable IGF-1.

Malnutrition in women with rheumatoid arthritis is not revealed by clinical anthropometrical measurements or nutritional evaluation tools.

OBJECTIVE: To evaluate diagnostic instruments for assessment of nutritional status in patients with rheumatoid arthritis (RA) in relation to objective body composition data. SUBJECTS AND METHODS: Study subjects include 60 in-ward patients (83% women, median age 65 years). Anthropometric measures and the nutritional tools Mini Nutritional Assessment (MNA), Subjective Global Assessment (SGA), Malnutrition Universal Screening Tool (MUST) and Nutritional Risk Screening tool 2002 (NRS-2002). Body composition was determined by dual-energy X-ray absorptiometry and fat-free mass index (FFMI; kg/m(2)) and fat mass index (FMI; kg/m(2)) were calculated. RESULTS: Mean body mass index (BMI) for RA women and men were 24.4 and 26.9 kg/m(2), respectively. Twelve per cent of the women and none of the few men had BMI<18.5 kg/m(2), that is, the cutoff value for malnutrition. FFMI indicated 52% of the women and 30% of the men to be malnourished. The sensitivity and specificity for BMI to detect malnutrition according to FFMI were 27 and 100%, whereas for arm muscle circumference the sensitivity was 36% and the specificity 89% and for triceps skin fold 43 and 93%, respectively. For MNA, sensitivity was 85% and specificity 39% and for SGA 46 and 82%. Both MUST and NRS-2002 had sensitivity of 45% and specificity of 19%. CONCLUSION: A large proportion of in-ward RA patients had reduced FFMI. Concurrent elevation of fat mass made BMI a non-reliable tool to detect malnutrition. Of the tested clinical evaluation tools, MNA might be used as a screening instrument, but because of its low specificity it should be followed by body composition determination.