Association between vitamin D and fatigue in patients with rheumatoid arthritis: a cross-sectional study

Multifactorial Nature of Fatigue in North Indian Rheumatoid Arthritis Patients

Introduction

Fatigue is a common, disabling, and poorly understood aspect of Rheumatoid arthritis (RA) treatment. Better understanding of fatigue is required for holistic treatment of RA. The present study was conducted to evaluate factors (disease activity, pain, sleep quality, and vitamin D) contributing to fatigue in RA.

Method

A cross-sectional study was conducted on 204 patients of RA. Fatigue was measured using CFQ-11 scale, pain and sleep impairment were assessed on visual analogue scale, disease activity by DAS 28 ESR, and vitamin D levels by enzyme chemiluminescence immunoassay. Univariate and multivariate binary logistic regression analyses were done to study association.

Results

Mean age of study subjects was 51±11.63 years with majority (89.7%) being females and mean duration of RA was 8.54 years. Prevalence of fatigue was 66.2% (CFQ-11 score >4/11). Deficiency of vitamin D was found in 12.3% subjects. Mean sleep impairment and pain score on VAS were 32.60±21.53 and 26.37±21.65 respectively. Univariate analysis revealed that CFQ-11 fatigue score was independently associated with disease activity, pain, sleep, and vitamin D deficiency. Further Multivariate binary logistic regression analysis showed strongest association of vitamin D deficiency with fatigue (OR of 6.38 with 95% confidence interval of 1.58, 25.71). Disease activity (OR - 1.714, 95% CI- 1.14, 2.55) and sleep impairment (OR - 1.038, 95% CI- 1.005, 1.071) have also been found to be significantly associated with fatigue.

Conclusion

Fatigue in RA is multifactorial, and it is mediated by disease-related factors (disease activity, sleep impairment) and non-disease-related factors (vitamin D deficiency).

Correlation between vitamin D metabolites and rheumatoid arthritis with osteoporosis by ultra-high-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS)

INTRODUCTION

Our aim is to study the correlation between vitamin D metabolites and osteoporosis in rheumatoid arthritis (RA) by ultra-high-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). At the same time, other influencing factors and serum biomarkers of osteoporosis in patients with RA were studied.

MATERIALS AND METHODS

Patients with RA admitted from January 2020 to December 2020 were selected at our hospital. The subjects were divided into the normal bone mineral density (BMD), osteopenia, and osteoporosis groups. The differences of vitamin D (VD) metabolites among groups were compared. The Pearson correlation coefficient was used to analyze the relationship between BMD and various parameters. The relationship between BMD and influencing factors was studied by a multiple linear regression equation.

RESULTS

A total of 287 patients with RA were included. RA patients with 25-hydroxy vitamin D [25(OH)D] deficiency accounted for 43.63% and 25(OH)D insufficient levels accounted for 31.37%. There were 31 cases (10.80%) in the normal BMD group, 161 cases (56.10%) in the osteopenia group, and 95 cases (33.10%) in the osteoporosis group. The BMD of L1-4 (T- score) was negatively correlated with age (P < 0.05), course of disease (P < 0.05), and erythrocyte sedimentation rate (ESR) (P < 0.05), and positively correlated with 25(OH)D₃ (P < 0.05). The multiple linear regression model results showed that age and 25(OH)D₃ were independent predictors of BMD; this explained 22.11% of the total variation.

CONCLUSIONS

VD deficiency and insufficient are common in RA patients. RA patients can be appropriately supplemented with VD. VD3 may be a better choice.