Abstract
To perform a cross-sectional comparison of endogenous markers of glomerular filtration rate (GFR) (plasma symmetric dimethylarginine (SDMA) and estimated GFR (eGFR)) with a direct measure of GFR (using the plasma clearance of Inutest (In-GFR)), and a longitudinal evaluation of these markers in relation to the development of microalbuminuria, in young people with type 1 diabetes (T1D). Longitudinal stored blood samples (n=1105) were available from 417 young people from the Oxford Regional Prospective Study (an inception cohort of 527 children followed for a median of 10.3 (interquartile range 7.1-12.3) years), for measurement of SDMA and creatinine. Additional annually collected data on anthropometric parameters, HbA1c, insulin dose and three early morning albumin:creatinine ratios were available. In-GFR was measured in a representative subgroup of 183 subjects. SDMA and eGFR. SDMA and eGFR were significantly and similarly associated with In-GFR (r=-0.38 and r=0.36, p<0.001). Overall SDMA levels were lower in microalbuminuric (n=116) than normoalbuminuric subjects (n=301) (0.385 + or - 0.063 vs 0.412 + or - 0.059 micromol/l, p<0.001), probably reflecting hyperfiltration. The pattern of change in SDMA levels with age differed bet...Continue Reading
Citations
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