Progression of overt nephropathy in non-insulin-dependent diabetes

Kidney International
B D MyersW E Mitch

Abstract

The detection of overt albuminuria (> 300 mg/g creatinine) in the absence of azotemia was used to diagnose early nephropathy in 34 Pima Indians with NIDDM of 16 +/- 1 years duration. Differential solute clearances were performed serially to define the course of the glomerular injury over 48 months. At baseline, the GFR (107 +/- 5 ml/min), filtration fraction and sieving coefficients of relatively permeant dextrans (< 52 A) were all depressed below corresponding values in 20 normoalbuminuric Pima Indians with a similar duration of NIDDM. Over the ensuing 48 months the GFR (-34%) and filtration fraction (-13%) in the nephropathic patients declined further. The sieving coefficients of large, nearly impermeant dextrans (> 56 A radius) increased selectively and fractional clearances of albumin and IgG increased correspondingly by > 10-fold. Analysis of the findings with pore theory revealed: (1) a progressive decline in pore density and the ultrafiltration coefficient (Kf); and (2) broadening of glomerular pore-size distribution that resulted in greater prominence of large pores (> 70 A radius). We conclude that increasing loss of intrinsic ultrafiltration capacity is the predominant cause of the early and progressive decline in GFR...Continue Reading

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Citations

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