Clinical and Experimental Nephrology

, Volume 12, Issue 2, pp 126–131 | Cite as

Relationship between serum 1,25-dihydroxyvitamin D and mortality in patients with pre-dialysis chronic kidney disease

  • Daijo Inaguma
  • Hiroshi Nagaya
  • Kazuhiro Hara
  • Miho Tatematsu
  • Hibiki Shinjo
  • Sachiyo Suzuki
  • Tomoko Mishima
  • Kei Kurata
Original Article

Abstract

Background

It is known that vitamin D has many functions besides involvement in calcium metabolism. It has recently been recognized that vitamin D deficiency is associated with mortality, especially in cardiovascular disease (CVD). Vitamin D deficiency is common in end-stage renal disease, but develops from the early stage of chronic kidney disease (CKD). So we investigated whether the serum level of the activated form of vitamin D (1,25-dihydroxyvitamin D) affected mortality in patients with CKD stages 3 and 4.

Methods

Between January 1, 1995, and June 30, 2006 we measured serum 1,25-dihydroxyvitamin D In 226 patients with CKD stages 3 and 4 and classified the results into two groups depending on whether the level was below (group I) or above (group II) 20 pg/ml. We ended the follow-up period on December 31, 2006. We compared all-cause and cardiovascular mortality between the two groups. We also examined predictors of mortality by using Cox proportional regression analysis.

Results

Two-hundred and twenty-six patients (67 men and 159 women, mean age 67.0) were registered in this study, and groups 1 and 2 comprised 84 and 142 patients, respectively. During the follow-up period 43 patients died. CVD was the major cause of death, followed by infectious disease. The Kaplan–Meier survival curve revealed that all-cause mortality was significantly higher in group I, but a significant difference between CVD mortality in the two groups was not demonstrated. By Cox proportional regression analysis, group I was related to all-cause mortality, but this was not proved to be an independent predictor.

Conclusion

The results suggested that serum level of 1,25-dihydroxyvitamin D was associated with all-cause mortality in patients with CKD stages 3 and 4.

Keywords

1,25-Dihydroxyvitamin D Chronic kidney disease Pre-dialysis 

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Copyright information

© Japanese Society of Nephrology 2008

Authors and Affiliations

  • Daijo Inaguma
    • 1
  • Hiroshi Nagaya
    • 1
  • Kazuhiro Hara
    • 1
  • Miho Tatematsu
    • 1
  • Hibiki Shinjo
    • 1
  • Sachiyo Suzuki
    • 1
  • Tomoko Mishima
    • 1
  • Kei Kurata
    • 1
  1. 1.Department of Nephrology and RheumatologyTosei General HospitalSetoJapan

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