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Incremental peritoneal dialysis and survival outcomes: a propensity-matched cohort study

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Abstract

Background

The advantages of an incremental dialysis start are not fully clear. We aimed to evaluate the association of incremental initiation of peritoneal dialysis with mortality.

Methods

Incident peritoneal dialysis patients with a catheter placed at our hospital between 2008 and 2017 were included. All patients were followed up until December 31, 2019. Patients were categorized into different groups according to the initial daily dialysis exchanges, and were matched at a ratio of 1:2 with propensity score matching. Multiple variables including age, sex, residual kidney function, urine volume, hemoglobin, serum albumin and other important variables were included for the matching. Primary outcomes were all-cause and cardiovascular mortality.

Results

A total of 1315 patients with a mean age of 45.9 years were enrolled. The mean glomerular filtration rate was 4.32 ml/min/1.73 m2 at start of dialysis. Two hundred eighty-five patients in the incremental group and 502 in the full dose group were matched for age, sex, residual kidney function, urine volume, hemoglobin, serum albumin and other important variables. Patient survival and cardiovascular event-free survival were similar between the two groups. However, during the first 6 years of peritoneal dialysis, patients in the incremental group had better survival (P = 0.011) and cardiovascular event-free survival (P = 0.044) than the full dose group, while such advantages disappeared when dialysis vintage became longer. Further analysis showed that the incremental group (vs full dose dialysis) had a 39% lower risk (95% CI 0.42–0.90, P = 0.012) of all-cause mortality and a 41% decreased risk (95% CI 0.35–0.99, P = 0.047) of cardiovascular mortality during the first 6 years of dialysis. Additionally, the cumulative hazard for anuria was significantly lower in the incremental group versus the full dose group (P = 0.006).

Conclusions

Our study shows a time-related survival advantage for incremental peritoneal dialysis patients, suggesting that an incremental regimen for starting peritoneal dialysis is feasible and is not associated with worse outcomes.

Graphical abstract

Graphical Abstract presenting schematically the measurements of the solvation response function by processing the relevant streak camera images and the time-correlated photon counting (TCSPC) data and appropriately combining them together.

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Data availability statement

All data generated or analyzed during this study are included in this article. Further inquiries can be directed to the corresponding author.

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Acknowledgements

We thank all nephrologists and nurses in our PD center for their excellent management of PD patients and maintenance of PD database. We also thank Richard Robins, PhD, from Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

Funding

This work was supported by the Guangdong Basic and Applied Basic Research Foundation (Grant no. 2019A1515011775), Guangdong Provincial Key Laboratory of Nephrology (Grant no. 2020B1212060028) and NHC Key Laboratory of Clinical Nephrology (Sun Yat-Sen University).

Author information

Authors and Affiliations

Authors

Contributions

XY proposed the concept of the study. RL and HY analyzed and interpreted the data. RL and HY wrote the draft of the article and revised it under the supervision of Professor XY. XY was responsible for the management of PD center and set up of PD database. XY, HM, FH and HY were in charge of the treatment of PD patients. RL, YP, JL and CY collected the data. YP, HW and XD provided intellectual content of critical importance to the work described. All authors approved the final version of the manuscript.

Corresponding author

Correspondence to Xiao Yang.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This study protocol was reviewed and approved by the Ethics Committee of the First Affiliated Hospital, Sun Yat-sen University, approval number ([2016]215).

Informed consent

All patients signed a written informed consent when they catheterized at our hospital, agreeing that their clinical information would be used for non-commercial scientific research.

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Liu, R., Ye, H., Peng, Y. et al. Incremental peritoneal dialysis and survival outcomes: a propensity-matched cohort study. J Nephrol 36, 1907–1919 (2023). https://doi.org/10.1007/s40620-023-01735-4

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