Abstract
Background
Hyperkalemia and hypokalemia are associated with mortality in patients undergoing hemodialysis. However, there are few reports on the association between potassium level fluctuations and mortality. We retrospectively investigated the association between serum potassium level variability and mortality in patients undergoing hemodialysis.
Methods
This study was conducted at a single center. Variability in serum potassium levels was evaluated using the standard deviation of potassium level from July 2011 to June 2012, and its association with prognosis was examined by following up the patients for 5 years. Serum potassium variability was assessed as the coefficient of variation, and the statistical analysis was performed after log transformation.
Results
Among 302 patients (mean age 64.9 ± 13.3; 57.9% male; and median dialysis vintage 70.5 months [interquartile range, IQR 34–138.3]), 135 died during the observation period (median observation period 5.0 years [2.3–5.0]). Although the mean potassium level was not associated with prognosis, serum potassium level variability was associated with prognosis, even after adjustments for confounding factors such as age and dialysis time (hazard ratio: 6.93, 95% confidence interval [Cl] 1.98–25.00, p = 0.001). After the adjustments, the coefficient of variation of potassium level in the highest tertile (T3) showed a higher relative risk for prognosis than that in T1 (relative risk: 1.98, 95% CI 1.19–3.29, p = 0.01).
Conclusions
Variability in serum potassium levels was associated with mortality in patients undergoing hemodialysis. Careful monitoring of potassium levels and their fluctuations is necessary for this patient population.
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The authors would like to thank Editage (www.editage.com) for English language editing.
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KY, MK, and SF designed the study. KY and MK performed the statistical analyses. KY, and MK drafted the document. KY, MK, and EO participated in data collection. SF, HM, and TN supervised data interpretation. All authors have reviewed and approved the final version of the manuscript.
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This study was approved by the Nagasaki Renal Center ethics committee (Nagasaki, Japan) (23002) and was conducted following the 1964 Declaration of Helsinki and its later amendments.
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Yamaguchi, K., Kitamura, M., Otsuka, E. et al. Association between annual variability of potassium levels and prognosis in patients undergoing hemodialysis. Clin Exp Nephrol 27, 873–881 (2023). https://doi.org/10.1007/s10157-023-02368-4
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DOI: https://doi.org/10.1007/s10157-023-02368-4