Abstract
Purpose
Sleep disturbance is frequently observed in patients on maintenance hemodialysis (MHD), and this population usually presents imbalances in trace elements. We investigated the association between blood trace element levels and sleep quality in patients on MHD.
Methods
This cross-sectional and single-center study was performed in September 2019. Patients regularly undergoing hemodialysis for > 3 months at our center were recruited, and demographic, clinical, and laboratory parameters were recorded. The Pittsburgh Sleep Quality Index (PSQI) was applied to define sleep disturbance. Blood trace element (zinc, manganese, copper, selenium, and lead) levels were measured using an inductively coupled plasma mass spectrometer.
Results
In total, 121 patients on MHD (male/female = 68:53) were enrolled in the study (mean age 63.7 ± 13.9 years, median dialysis vintage 38.0 [20.0, 60.0] months). According to PSQI, 56 (46%) patients experienced severe sleep disturbance. These patients were characterized by older age, higher serum parathyroid hormone levels, and lower blood selenium levels (all P < 0.05). No significant differences in blood zinc, manganese, copper, and lead levels were observed between groups. Univariate binary logistic regression showed that lower blood selenium levels were associated with severe sleep disturbance (odds ratio = 0.976, 95% confidence interval: 0.954–0.999, P = 0.038). Multivariate analyses also confirmed the results after adjusting for confounding factors.
Conclusion
Our study indicated an association between lower blood selenium levels and the occurrence of severe sleep disturbances in patients on MHD. However, a prospective study with a larger sample size and assessing the importance of selenium supplementation are needed to confirm the results.
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Data Availability
The authors agree all data and statistical information essential to this paper will be made available for review if required.
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Acknowledgments
We are indebted to all nephrologists and nurses in our hemodialysis center for their excellent management of hemodialysis patients. We also thank the patients and staffs involved in the cross-sectional study. We specially thank Shilin Xu, B.S.Nurse, because all the laboratory data in the study derived from the electronic management system for blood purification center (Hope®, software) are developed by him, which can import the laboratory test results according to the patients’ IDs included in the study.
Funding
This research was supported by a grant from the Science and Technology Planning Project of Guangdong Province (2016A020215023) and a grant from the Guangdong Provincial Department of Science and Technology Project (2017B090904027).
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S.X. contributed to the study design, partial data collection, and drafting of the manuscript; D. Z was involved in the analysis and interpretation of the data; R.T, S.L, W.C, L.W, and Y.L completed the PSQI questionnaire for patients and collection of clinical data; and Y.L and X.Z were involved in the study design, critical revision of the manuscript for important intellectual content, and final approval of the submitted manuscript.
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The research protocol conforms to the Declaration of Helsinki and was approved by the Ethics Committee of the Guangzhou Red Cross Hospital, Jinan University Hospital (license code: 2019-235-01). All patients gave their informed consent prior to their inclusion in the study.
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Written informed consent was obtained from all patients.
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Xu, S., Zou, D., Tang, R. et al. Levels of trace blood elements associated with severe sleep disturbance in maintenance hemodialysis patients. Sleep Breath 25, 2007–2013 (2021). https://doi.org/10.1007/s11325-021-02336-w
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DOI: https://doi.org/10.1007/s11325-021-02336-w