Increased levels of symmetric dimethyl-arginine are associated with all-cause mortality in patients with symptomatic peripheral arterial disease

Journal of Vascular Surgery
Aleksandra StaniszewskaJulie Brittenden

Abstract

Recent interest has focused on the role of the methyl-arginines, endogenous inhibitors of nitric oxide, as adverse prognostic indicators. To date, few studies have assessed the role of symmetric dimethyl-arginine (SDMA) in patients with peripheral arterial disease. We aimed to determine the relationship, if any, of SDMA to all-cause mortality and disease severity as assessed by the ankle-brachial index (ABI) in patients with symptomatic peripheral arterial disease (PAD). In 238 patients with symptomatic PAD and an ABI of <0.8, l-arginine, asymmetric dimethyl-arginine (ADMA) and SDMA levels were measured by hydrophilic-interaction liquid chromatography-electrospray tandem mass spectrometry. The median follow-up was 6 years 11 months (interquartile range [IQR], 4 years 5 months-7 years 10 months). SDMA and ADMA levels were higher in those who died compared with those who survived (0.51 [IQR, 0.44-0.66] μmol/L vs 0.46 [IQR, 0.39-0.55] μmol/L, P ≤ .001; and 0.48 [IQR, 0.41-0.55] μmol/L vs 0.45 [IQR, 0.39-0.50] μmol/L, P = .007, respectively). l-arginine levels were similar in the two groups. On multivariate analysis, SDMA and ADMA as continuous variable were significantly associated with mortality (P = .001). For SDMA and ADMA, the...Continue Reading

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