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Results from the Atherosclerosis Risk in Communities study suggest that low serum magnesium is associated with incident kidney disease

A. Tin,Morgan E. Grams,N. Maruthur,B. Astor,D. Couper,T. Mosley,E. Selvin,J. Coresh,W. H. Linda Kao

Published 2014 in Kidney International

ABSTRACT

Low serum magnesium has been associated with kidney function decline in persons with diabetes as well as cardiovascular disease in the general population. Since the association of serum magnesium with incident kidney disease in the general population is unknown, we assessed this in 13,226 participants (aged 45 to 65) in the Atherosclerosis Risk in Communities study with baseline estimated glomerular filtration rate of at least 60 ml/min/1.73m2 in years 1987–89 and followed through 2010. The risks for incident chronic kidney disease (CKD) and end-stage renal disease (ESRD) associated with baseline total serum magnesium levels were evaluated using Cox regression. There were 1,965 CKD and 208 ESRD events during a median follow-up of 21 years. In adjusted analysis, low serum magnesium levels (0.7mmol/L or less) had significant associations with incident CKD and ESRD compared with the highest quartile with adjusted hazard ratio of 1.58 (95% CI: 1.35–1.87) for CKD and 2.39 (95% CI: 1.61–3.56) for ESRD. These associations remained significant after excluding users of diuretics and across subgroups stratified by hypertension, diabetes, and self-reported race. Thus, in a large sample of middle-aged adults, low total serum magnesium was independently associated with incident CKD and ESRD. Further studies are needed to determine whether modification of serum magnesium levels might alter subsequent incident kidney disease rates.

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