Risk factors and renal outcomes of low bone mineral density in patients with non-dialysis chronic kidney disease (original) (raw)

Abstract

Summary

Bone disorder is a common complication of chronic kidney disease (CKD). The clinical usefulness of bone mineral density (BMD) in CKD is not well known. Our study shows that low BMD is associated with physical activity and dietary Na/K intake ratio and can predict poor renal outcome in non-dialysis CKD.

Purpose

Despite evidence of a link between bone mineral disorders and chronic kidney disease (CKD), the clinical implications of bone mineral density (BMD) in CKD are not well established. We investigated risk factors and renal outcomes of low BMD in CKD.

Methods

We analyzed data from the KNOW-CKD. BMD measured by dual-energy x-ray absorptiometry was classified by T score: normal (T score ≥ − 1.0), osteopenia (− 1.0 > T score > − 2.5), and osteoporosis (T score ≤ − 2.5) of the lumbar spine, hip, or femoral neck. Logistic regression analysis to assess risk factors of low BMD (T score < − 1.0) and Cox proportional hazards models to estimate risk of incident end-stage renal disease (ESRD).

Results

Low BMD was prevalent (osteopenia 33%; osteoporosis 8%) in 2128 adults with CKD (age 54 ± 12 years; male 61%). Over a median follow-up of 4.3 years, there were 521 cases of incident ESRD. Lower BMD was associated with female sex, older age, low eGFR, low BMI, and lifestyle factors of physical activity (odds ratio (OR) = 0.62, 95% confidence interval (0.49–0.77)) and spot urine Na/K ratio (1.07 (1.00–1.15)). In adjusted Cox models, low BMD was associated with increased incident ESRD (hazard ratio (HR) = 1.14 (0.92–1.41) for osteopenia; 1.43 (1.01–2.04) for osteoporosis, P for trend < 0.05) compared with the reference of normal BMD. The association between low BMD and ESRD was similar according to T score discordance classification.

Conclusions

Low BMD was associated with modifiable lifestyle factors including low physical activity and high dietary Na/K intake ratio. The presence of low BMD is associated with poor renal outcomes in non-dialysis CKD.

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Funding

The KNOW-CKD was funded by grants 2011E3300300, 2012E3301100, and 2013E3301600 from Research of the Korea Centers for Disease Control and Prevention.

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Authors and Affiliations

  1. Division of Nephrology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 03181, Republic of Korea
    Y. Y. Hyun & K.-B. Lee
  2. Department of Internal Medicine, College of Medicine, Institute of Kidney Disease Research, Yonsei University, Seoul, South Korea
    S. H. Han & K. H. Choi
  3. Department of Internal Medicine, Kangnam Sacred Heart Hospital, Hallym University Medical Center, Seoul, South Korea
    H. C. Park
  4. Department of Internal Medicine, Seoul National University Boramae Hospital, Seoul, South Korea
    Y. K. Oh
  5. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, South Korea
    S. K. Park
  6. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
    K.-H. Oh & C. Ahn

Authors

  1. Y. Y. Hyun
  2. K.-B. Lee
  3. S. H. Han
  4. K. H. Choi
  5. H. C. Park
  6. Y. K. Oh
  7. S. K. Park
  8. K.-H. Oh
  9. C. Ahn

Consortia

on behalf of the KoreaN cohort study for Outcome in patients With CKD (KNOW-CKD) Study Group

Corresponding author

Correspondence toK.-B. Lee.

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The authors declare that they have no conflict of interest.

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Hyun, Y.Y., Lee, KB., Han, S.H. et al. Risk factors and renal outcomes of low bone mineral density in patients with non-dialysis chronic kidney disease.Osteoporos Int 31, 2373–2382 (2020). https://doi.org/10.1007/s00198-020-05531-9

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