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Nephrol Dial Transplant (2001) 16: 1183-1188
© 2001 European Renal Association-European Dialysis and Transplant Association

Prospective study on renal outcome of IgA nephropathy superimposed on diabetic glomerulosclerosis in type 2 diabetic patients

Siu-Ka Mak, Ping-Nam Wong, Kin-Yee Lo, Gensy M. W. Tong and Andrew K. M. Wong

Renal Unit, Department of Medicine, Kwong Wah Hospital, Kowloon, Hong Kong, China

Background and methods. In order to examine the clinical outcome of IgA nephropathy (IgAN) superimposed on diabetic glomerulosclerosis in type 2 patients we studied 36 Chinese patients (26 men, 10 women), who were recruited for renal biopsy when they had proteinuria of more than 1 g/day. Twenty-seven had isolated diabetic glomerulosclerosis and nine had IgAN superimposed on diabetic glomerulosclerosis (combined). Renal function was assessed by serial serum creatinine, 24-h urine protein and creatinine measurements. Patient survival rate, incidence of end-stage renal disease (ESRD), blood pressure, and glycaemic control status were determined.

Results. The age at the time of renal biopsy was younger for the combined group when compared with the diabetic glomerulosclerosis group (44±3.6 vs 58±2.1 years, P=0.006). The duration of diabetes was, however, similar for the two groups (8.0±2.3 vs 6.7±1.2 years, P=NS). After a mean follow-up of 31.6±15.3 months, 15 patients (one in the combined group and 14 in the diabetic glomerulosclerosis group) developed ESRD. Nine patients (all in the diabetic glomerulosclerosis group) died during follow-up. With similar glycaemic and blood pressure control, the two groups had comparable rate of decline of creatinine clearance (CrCl) (-0.73±0.26 vs -0.73± 0.18 ml/min/1.73 m2/month, P=NS), final serum creatinine (363±134 vs 426±52 µmol/l, P=NS) and proteinuria levels (4.3±0.9 vs 4.4±0.6 g/day, P=NS), as well as CrCl (44.1±19.0 vs 33.4±6.9 ml/min/ 1.73 m2, P=NS).

Conclusion. It is concluded that the superimposed IgAN does not significantly alter the medium-term clinical outcome of patients with diabetic glomerulosclerosis.

Keywords: outcome; superimposed IgA nephropathy; type 2 diabetes

Correspondence and offprint requests to: Dr Siu-Ka Mak, Renal Unit, Department of Medicine, Kwong Wah Hospital, 25 Waterloo Road, Kowloon, Hong Kong, China.


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