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Long-term excess mortality after hip fracture in hemodialysis patients: a nationwide cohort study in Japan

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Abstract

Introduction

Fracture dialysis patients have a higher risk of 1-year mortality compared with non-fracture dialysis patients. However, it is unclear whether excess mortality persists for more than a year.

Materials and methods

We conducted a nationwide cohort study in 162,360 hemodialysis patients in Japan. Study outcomes were 5-year all-cause mortality and cause-specific mortality. Cox proportional hazards regression was used to examine the association between hip fracture and mortality in two cohorts: the full cohort, which included potential confounders as covariates in multivariable-adjusted regression models, and the propensity score-matched cohort.

Results

Crude mortality rates for fracture patients were double those of non-fracture patients and persisted during the 5-year period. The association between hip fracture and mortality was significant even after adjusting for premorbid conditions (hazard ratio (HR) 1.22, 95% confidence interval (CI) 1.13–1.32). Similar findings were observed in the propensity score-matched cohort of 2410 patients (HR 1.20, 95% CI 1.05–1.36). While cause-specific mortality rates for all categories, with the exception of sudden deaths, were higher for fracture patients relative to non-fracture patients in the full unmatched cohort, only the mortality rate for heart disease was significantly higher for fracture patients relative to non-fracture patients in the propensity score-matched cohort.

Conclusion

Excess mortality persisted for many years after hip fracture in hemodialysis patients, and was still present after adjusting for several premorbid conditions and propensity score matching.

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Acknowledgments

We thank the Committee of the Renal Data Registry of the Japanese Society for Dialysis Therapy (JSDT) for permission to use their data. The opinions reflected in this manuscript are those of the authors alone and do not reflect the official position of JSDT.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by MW, AW, TH, and IM. The first draft of the manuscript was written by MW and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Minako Wakasugi.

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Conflict of interest

Dr. Hamano received grants and personal fees from Chugai Pharmaceutical Company, Torii Pharmaceutical Company, Kyowa Kirin Company, Kissei Pharmaceutical Company, and Bayer, outside the submitted work. The other authors declare that they have no other relevant financial interests to disclose.

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Wakasugi, M., Kazama, J.J., Wada, A. et al. Long-term excess mortality after hip fracture in hemodialysis patients: a nationwide cohort study in Japan. J Bone Miner Metab 38, 718–729 (2020). https://doi.org/10.1007/s00774-020-01110-4

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  • DOI: https://doi.org/10.1007/s00774-020-01110-4

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