Abstract
Objectives
To investigate the clinical features and factors associated with primary Sjögren’s syndrome (pSS)–associated renal tubular acidosis (RTA).
Method
This case–control study was based on a multicenter pSS registry established by the Chinese Rheumatism Data Center. Patients with pSS, including those with RTA and those without renal involvement, between May 2016 and March 2020 were included in the analysis. Demographic, clinical, and laboratory data were also collected. Univariate and multivariate logistic regression analyses were used to identify factors that were associated with pSS-RTA.
Results
This study included 257 pSS patients with RTA and 4222 patients without renal involvement. Significantly younger age at disease onset (40.1 ± 14.1 vs. 46.2 ± 13.1 years, P < 0.001), longer diagnosis interval (15.0 interquartile range [IQR] [1.0, 48.0] vs. 6.0 IQR [0, 34.0] months, P < 0.001), higher EULAR Sjögren’s syndrome disease activity index (9 IQR [5, 15] vs. 3 IQR [0, 8], P < 0.001), and a higher prevalence of decreased estimated glomerular filtration rate (25.0% vs. 6.6%, P < 0.001) were observed in pSS patients with RTA than in those without renal involvement. Factors that were independently associated with pSS-RTA included age at disease onset ≤ 35 years (odds ratio [OR] 3.00, 95% confidence interval [CI] 2.27–3.97), thyroid disorders (OR 1.49, 95% CI 1.04–2.14), subjective dry mouth (OR 3.29, 95% CI 1.71–6.35), arthritis (OR 1.57, 95% CI 1.10–2.25), anti-SSB antibody positivity (OR 1.80, 95% CI 1.33–2.45), anemia (OR 1.67, 95% CI 1.26–2.21), elevated alkaline phosphatase level (OR 2.14, 95% CI 1.26–3.65), decreased albumin level (OR 1.61, 95% CI 1.00–2.60), and elevated erythrocyte sedimentation rate (OR 1.78, 95% CI 1.16–2.73).
Conclusions
Delayed diagnosis and decreased kidney function are common in pSS patients with RTA. pSS should be considered in patients with RTA, and early recognition and treatment may be useful in slowing the deterioration of renal function in patients with pSS-RTA.
Key Points • pSS patients with RTA have earlier disease onset and higher disease activity than pSS patients without RTA, but the diagnosis was frequently delayed. • Decreased kidney function are common in pSS patients with RTA. • Sjögren’s syndrome should be considered in young female patients with unexplained RTA, whereas RTA should be screened in pSS patients with early disease onset and elevated ALP level. |
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We acknowledged the contributions from all medical centers in the CRDC all over China and the HealthCloud Co., Ltd, as the system provider.
Funding
This study was supported by the Chinese National Key Technology R&D Program, Ministry of Science and Technology (2017YFC0907601, 2017YFC0907605), and Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (CIFMS) (2021-I2M-1-005).
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MTL, LYZ, JLZ, DX, YZ, and XFZ contributed to the conception and design of the study. LQ, LYZ, QL, JL, PTY, XDK, XWD, MJZ, XML, YFW, and JX contributed to data collection. YYZ and YHW participated in statistical analysis and interpretation. YYZ drafted the manuscript. MTL and DX revised the manuscript critically. DX, MTL, YZ, and XFZ supervised the study. All authors read and approved the final manuscript.
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Written informed consent was obtained from all patients at enrollment. Ethics approval for the registry was obtained from the Medical Ethics Committee of Peking Union Medical College Hospital (JS-2038).
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Zhang, Y., Qiao, L., Zhang, L. et al. Renal tubular acidosis and associated factors in patients with primary Sjögren’s syndrome: a registry-based study. Clin Rheumatol 42, 431–441 (2023). https://doi.org/10.1007/s10067-022-06426-2
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DOI: https://doi.org/10.1007/s10067-022-06426-2