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Effects of L-Carnitine on Mineral Metabolism in the Multicentre, Randomized, Double Blind, Placebo-Controlled CARNIDIAL Trial.
BACKGROUND: The use of L-carnitine has been proposed in haemodialysis (HD) when deficiency is present to improve anaemia resistant to erythropoietin stimulating agent, intradialytic hypotension or cardiac failure. We tested the effects of L-carnitine supplementation on parameters of chronic kidney disease-mineral bone disorder.
METHODS: CARNIDIAL was a randomized, double-blinded trial having included 92 incident HD subjects for a 1-year period to receive L-carnitine versus placebo. Determinant factors of C-terminal fibroblast growth factor 23 (cFGF23) and intact FGF23 were studied including Klotho level. The L-carnitine effect on mineral metabolism was analyzed between groups by mixed linear models for repeated measurements.
RESULTS: Klotho was below the lower limit of quantification (LLOQ) in 55% of the 163 samples. In multivariate analysis, cFGF23 was positively correlated with calcium and phosphate and was higher in subjects having Klotho > LLOQ. No correlation existed between Klotho and phosphate and phosphate was even higher in subjects having Klotho > LLOQ (p < 0.001). Both forms of FGF23 were not related to iron markers nor to IV iron dose. No L-carnitine effect was detected on parathyroid hormone (PTH) or FGF23 during the study period where PTH slightly decreased over time, whereas FGF23 increased. But calcium and phosphate increased more in the L-carnitine group.
CONCLUSION: L-carnitine supplementation increased calcium and phosphate plasma concentrations with no detected downregulation effect on PTH and FGF23. (Clinical Trial 00322322, May 5, 2006).
METHODS: CARNIDIAL was a randomized, double-blinded trial having included 92 incident HD subjects for a 1-year period to receive L-carnitine versus placebo. Determinant factors of C-terminal fibroblast growth factor 23 (cFGF23) and intact FGF23 were studied including Klotho level. The L-carnitine effect on mineral metabolism was analyzed between groups by mixed linear models for repeated measurements.
RESULTS: Klotho was below the lower limit of quantification (LLOQ) in 55% of the 163 samples. In multivariate analysis, cFGF23 was positively correlated with calcium and phosphate and was higher in subjects having Klotho > LLOQ. No correlation existed between Klotho and phosphate and phosphate was even higher in subjects having Klotho > LLOQ (p < 0.001). Both forms of FGF23 were not related to iron markers nor to IV iron dose. No L-carnitine effect was detected on parathyroid hormone (PTH) or FGF23 during the study period where PTH slightly decreased over time, whereas FGF23 increased. But calcium and phosphate increased more in the L-carnitine group.
CONCLUSION: L-carnitine supplementation increased calcium and phosphate plasma concentrations with no detected downregulation effect on PTH and FGF23. (Clinical Trial 00322322, May 5, 2006).
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