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Published ahead of print on May 7, 2008
Journal of the American Society of Nephrology
© 2008 American Society of Nephrology
doi: 10.1681/ASN.2007111164
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Received November 1, 2007
Accepted on March 24, 2008

CLINICAL RESEARCH

Association of Oral Calcitriol with Improved Survival in Nondialyzed CKD

Abigail B. Shoben *, Kyle D. Rudser *, Ian H. de Boer {dagger}, Bessie Young {ddagger}, and Bryan Kestenbaum {sect}1

*Department of Biostatistics, {dagger}Division of Nephrology, {ddagger}Division of Nephrology, Puget Sound Veterans’ Affairs Medical Center, and {sect}Division of Nephrology, Harborview Medical Center, University of Washington, Seattle, Washington


1 To whom correspondence should be addressed. E-mail: brk{at}u.washington.edu.


   Abstract

Parenteral vitamin D is associated with improved survival among long-term hemodialysis patients. Among nondialyzed patients with chronic kidney disease (CKD), oral activated vitamin D reduces parathyroid hormone levels, but the impact on clinical outcomes is unknown. We evaluated associations of oral calcitriol use with mortality and dialysis dependence in 1418 nondialysis patients with CKD and hyperparathyroidism in the Veterans’ Affairs Consumer Health Information and Performance Sets database. Incident calcitriol users and nonusers were selected on the basis of stages 3 to 4 CKD, hyperparathyroidism, and the absence of hypercalcemia before calcitriol use and then were matched by age and estimated kidney function. During a median follow-up of 1.9 yr, 408 (29%) patients died and 217 (16%) initiated long-term dialysis. After adjustment for demographics; comorbidities; estimated kidney function; medications; and baseline levels of parathyroid hormone, calcium, and phosphorous, oral calcitriol use was associated with a 26% lower risk for death (95% confidence interval 5 to 42% lower; P = 0.016) and a 20% lower risk for death or dialysis (95% confidence interval 1 to 35% lower; P = 0.038). The association of calcitriol with improved survival was not statistically different across baseline parathyroid hormone levels. Calcitriol use was associated with a greater risk for hypercalcemia. In conclusion, oral calcitriol use is associated with lower mortality in nondialysis patients with CKD.


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