Abstract
Background
To investigate whether pre-dialysis level of serum creatinine (SCre) could indicate the responsiveness to zinc supplementation of patients on maintenance hemodialysis (MHD).
Methods
We retrospectively reviewed the results of our previous randomized study of 91 patients who had been on MHD and received zinc supplementation with either zinc acetate hydrate (ZAH; zinc, 50 mg/day) or polaprezinc (PPZ; zinc, 34 mg/day). A late response to zinc supplementation was defined as a serum zinc level of < 80 μg/dL three months after the study began. Patients were divided into two groups: late response (serum zinc level < 80 μg/dL) and early response (serum zinc level ≥ 80 μg/dL). Factors independently associated with a late response to zinc supplementation were determined using inverse probability of treatment weighting (IPTW) multivariate logistic analysis.
Results
Of 91 patients, 86 continued to receive zinc supplementation after three months. The mean pre-dialysis SCre level was 10.0 mg/dL. The number of patients with a late response and response to zinc supplementation was 32 and 54, respectively. There was a significant negative correlation between the pre-dialysis SCre and the Δserum zinc change for 3 months. (r = − 0.284, P = 0.008). IPTW multivariate analysis showed that a pre-dialysis SCre level ≥ 10.0 mg/dL (odds ratio, 3.71; 95% confidence interval; 1.24–11.1, P = 0.022) was an independent factor associated with a late response to zinc supplementation.
Conclusions
Pre-dialysis SCre level was independently associated with responsiveness to zinc supplementation after three months in patients on MHD.
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Acknowledgements
We thank all staffs of Oyokyo Kidney Institute Aomori Hospital for their invaluable help with data collection.
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Conceptualization: TO; methodology: TO and SH; formal analysis and investigation: TO, writing—original draft preparation: TO; writing—review and editing: TO and SH; data acquisition and clinical follow-up: TO, KT, TH, YT, KI, TT, and FS; supervision: TS and CO.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study approved by the Ethics Committee of Hirosaki University Graduate School of Medicine (IRB number, Ken11H30001). The trial is registered in the UMIN Clinical Trials Registry UMIN000031200.
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10157_2020_1911_MOESM1_ESM.pptx
Figure S1. Correlation between pre-dialysis serum creatinine (SCre) and the creatinine index. Pearson’s correlation analysis revealed a strong positive correlation between pre-dialysis SCre and the creatinine index. Figure S2. Sex difference in pre-dialysis serum creatinine (SCre) and Δzinc. A Pre-dialysis SCre level in female patients was significantly lower than that in male patients (A). The Δzinc in patients with SCre ≥ 10 mg/dL were significantly lower overall than in those with SCre <10 mg/dL within male patients (B). No significant results were obtained within female patients (C). Figure S3. The change of pre-dialysis serum creatinine (SCre) during the study period. Repeated-measures analysis of variance (ANOVA) showed that there was a significant change in pre-dialysis SCre during the study (P = 0.008). On the post-hoc analysis, a pre-dialysis SCre at 3 months was significantly reduced compared with that in 1 month (P <0.001). P value adjustment by Bonferroni’s correction (PPTX 229 kb)
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Okamoto, T., Hatakeyama, S., Togashi, K. et al. Pre-dialysis serum creatinine as an independent predictor of responsiveness to zinc supplementation among patients on hemodialysis. Clin Exp Nephrol 24, 955–962 (2020). https://doi.org/10.1007/s10157-020-01911-x
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DOI: https://doi.org/10.1007/s10157-020-01911-x