Symmetric dimethylarginine is a stronger predictor of mortality risk than asymmetric dimethylarginine among older people with kidney disease

Annals of Clinical Biochemistry
Liyona PatelEdmund J Lamb

Abstract

Circulating asymmetric dimethylarginine and symmetric dimethylarginine are increased in patients with kidney disease. Symmetric dimethylarginine is considered a good marker of glomerular filtration rate, while asymmetric dimethylarginine is a marker of cardiovascular risk. However, a link between symmetric dimethylarginine and all-cause mortality has been reported. In the present study, we evaluated both dimethylarginines as risk and glomerular filtration rate markers in a cohort of elderly white individuals, both with and without chronic kidney disease. Glomerular filtration rate was measured in 394 individuals aged >74 years using an iohexol clearance method. Plasma asymmetric dimethylarginine, symmetric dimethylarginine and iohexol were measured simultaneously using isotope dilution tandem mass spectrometry. Plasma asymmetric dimethylarginine concentrations were increased ( P < 0.01) in people with glomerular filtration rate <60 mL/min/1.73 m2 compared with those with glomerular filtration rate ≥60 mL/min/1.73 m2, but did not differ ( P > 0.05) between those with glomerular filtration rate 30-59 mL/min/1.73 m2 and <30 mL/min/1.73 m2. Plasma symmetric dimethylarginine increased consistently across declining glomerular filtrat...Continue Reading

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