Nephrology Dialysis Transplantation, Vol 12, Issue 6 1149-1154, Copyright © 1997 by Oxford University Press
S Rudberg and R Osterby
Background. Overt diabetic nephropathy is accompanied
by a progressive decline in glomerular filtration rate (GFR). In this study
we have investigated if a reduction of GFR already during the transition
from normo- to microalbuminuria is associated with glomerular structural
changes. Methods. Seventeen adolescents (11 girls/6
boys) with 10.5 (3.4) (mean, SD) years of IDDM were studied. GFR was
previously measured in the normoalbuminuric stage 2-5 years prior to the
renal biopsy, and measured again at the time for the biopsy, after in mean
1.8 years of microalbuminuria (15-200 &mgr;g/min). HbAlc and albumin
excretion rate were measured 3 or 4 times yearly and blood pressure 1-4
times yearly between the GFR examinations. The associations between the
yearly rate of fall in GFR and basement membrane (BM) thickness, mesangial
and matrix volume fractions, matrix star volume, mean capillary diameter
(CAPD), area of filtration surface (peripheral BM) per glomerulus, total
capillary length per glomerulus, the ratio of peripheral BM to capillary
surface, glomerular volume, and interstitial volume fraction were analysed.
Results. BM thickness and matrix star volume were
increased in patients with, as compared to those without, a decline in
GFR⩾6 ml/min per year (P<0.005
respectively). Patients with previous glomerular hyperfiltration
(⩾135 ml/min per 1.73 m2) showed the
steepest decline in GFR; 11 ml/min per year versus -0.8 ml/min per year in
previously normofiltering patients, P<0.001.
The rate of fall in GFR was positively correlated to BM thickness
(P<0.001), interstitial volume fraction
(P=0.02) and CAPD (P=0.04), mean
HbAlc (P=0.01), but not to the change in HbAlc between
GFR examinations. Conclusion. A decreasing glomerular
filtration rate in the early stage of microalbuminuria may be due to more
advanced diabetic glomerulopathy than in IDDM patients with stable GFR.
Keywords: basement membrane thickness; diabetic
glomerulopathy; glomerular filtration rate; mesangial matrix;
microalbuminuria; renal interstitium
ORIGINAL ARTICLES
Decreasing glomerular filtration rate - an indicator of more advanced diabetic glomerulopathy in the early course of microalbuminuria in IDDM adolescents?
Department of Woman and Child, Paediatric Unit, Karolinska Institute, Stockholm, Sweden; Electron Microscopy Laboratory, Institute of Experimental Clinical Research, Institute of Pathology, Arhus University, Arhus, Denmark; Corresponding author address: St Goran's Children's Hospital, S-112 81 Stockholm, Sweden
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