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  • Title: Bone alkaline phosphatase and mortality in dialysis patients.
    Author: Drechsler C, Verduijn M, Pilz S, Krediet RT, Dekker FW, Wanner C, Ketteler M, Boeschoten EW, Brandenburg V, NECOSAD Study Group.
    Journal: Clin J Am Soc Nephrol; 2011 Jul; 6(7):1752-9. PubMed ID: 21597029.
    Abstract:
    BACKGROUND AND OBJECTIVES: Serum alkaline phosphatase (AP) is associated with vascular calcification and mortality in hemodialysis patients, but AP derives from various tissues of origin. The aim of this study was to assess the effect of bone-specific AP (BAP) on morbidity and mortality in dialysis patients. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: From a prospective cohort study of incident dialysis patients in The Netherlands, all patients with measured BAP at 12 months after the start of dialysis (baseline) were included in the analysis (n = 800; mean age, 59 ± 15 years; mean BAP = 18 ± 13 U/L). By Cox regression analyses, we assessed the impact of BAP levels on short-term mortality (6 months) and longer-term mortality (4-year follow-up). RESULTS: High levels of BAP strongly affected short-term mortality. After adjustment for confounders, patients in the highest BAP tertile had a 5.7-fold increased risk of death within 6 months compared with patients in the lowest tertile. The effect applied to both cardiovascular and noncardiovascular mortality. Furthermore, high levels of BAP were associated with increased cardiovascular mortality in the longer term. In comparison with total AP, the effect sizes related to clinical outcomes were much higher for BAP. CONCLUSIONS: High levels of BAP were strongly associated with short-term mortality in dialysis patients, pointing out the important impact of bone turnover. Longitudinal assessments of BAP may be useful for the treatment monitoring in clinical practice in dialysis patients.
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