Prognostic Importance of Serum Alkaline Phosphatase in CKD Stages 3–4 in a Clinical Population

Taliercio, Jonathan J.; Schold, Jesse D.; Simon, James F.; Arrigain, Susana; Tang, Anne; Saab, Georges; Nally, Joseph V.; Navaneethan, Sankar D.

doi:10.1053/j.ajkd.2013.04.012

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Prognostic Importance of Serum Alkaline Phosphatase in CKD Stages 3–4 in a Clinical Population

Published Date:

Jun 12 2013

Publisher's site:

http://dx.doi.org/10.1053/j.ajkd.2013.04.012 New Site Icon

Source:

Am J Kidney Dis. 2013; 62(4):703-710.

[PDF-515.43 KB]

Details:

Personal Authors:

Taliercio, Jonathan J. ; Schold, Jesse D. ; Simon, James F. ; Arrigain, Susana ; Tang, Anne ; ... More ▼

Keywords:

[+]

Pubmed ID:

23769134

Pubmed Central ID:

PMC3783514

Description:

Background

Elevated total serum alkaline phosphatase (ALP) levels have been associated with mortality in the general population and in dialysis patients.

Study Design

Retrospective cohort study.

Setting & Participants

28,678 patients with chronic kidney disease (CKD) stages 3 and 4 (estimated glomerular filtration rate [eGFR], 15–59 ml/min/1.73 m2) were identified using the Cleveland Clinic Chronic Kidney Disease Registry. CKD was defined as two eGFR values <60 ml/min/1.73 m2 drawn >90 days apart using the Chronic Kidney Disease Epidemiology Collaboration creatinine equation.

Predictor

ALP levels measured using the calorimetric assay was examined as quartiles (quartile 1, <66 U/L; Q2, 66–81 U/L; Q3, 82–101 U/L; and Q4, ≥102 U/L) and as a continuous measure.

Outcomes & Measurements

All-cause mortality and ESRD were ascertained using the Social Security Death Index and US Renal Data System.

Results

After a median follow up of 2.2 years, 588 patients progressed to ESRD and 4,755 died. There was a graded increase in the risk for mortality with higher ALP quartiles (Q2, Q3, Q4) when compared to the reference quartile (Q1) after adjusting for demographics, comorbid conditions, use of relevant medications and liver function tests. The highest quartile of ALP was associated with a hazard ratio for ESRD of 1.38 (95% CI, 1.09–1.76). Each 1-standard deviation (42.7 U/L) higher ALP level was associated with 15% (95% CI, 1.09–1.22) and 16% (95% CI, 1.14–1.18) increased risk of ESRD and mortality respectively.

Limitations

Single center observational study, lack complete data including PTH for all study participants and attrition bias.

Conclusions

Higher serum ALP levels in CKD stages 3–4 were independently associated with all-cause mortality and ESRD.

Document Type:

Journal Article

Collection(s):

CDC Public Access

Funding:

1R39OT22056/OT/OSTLTS CDC HHS/United States
DK094112/DK/NIDDK NIH HHS/United States
KL2 RR024990/RR/NCRR NIH HHS/United States
P60MD00265/MD/NIMHD NIH HHS/United States
R01 DK085185/DK/NIDDK NIH HHS/United States
R34 DK094112/DK/NIDDK NIH HHS/United States
RR024990/RR/NCRR NIH HHS/United States

Supporting Files:

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