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[Prevalence of subnormal glomerular filtration rate in patients with diabetes mellitus].

AIM
To evaluate prevalence of subnormal glomerular filtration rate (GFR) in diabetes mellitus (DM) patients with reference to albuminuria level.


MATERIAL AND METHODS
GFR by MDRD and urine excretion of protein/albumin were estimated in 851 diabetic patients (473 with type 1 DM and 378 with type 2 DM).


RESULTS
Normoalbuminuria (NAU), microalbuminuria (MAU) and proteinuria were detected in 54, 16 and 30% type 1 diabetics, respectively; 77% had subnormal GFR, in NAU 8.3% had GFR decline (< 60 ml/min) corresponding to stage III-IV chronic disease of the kidneys. In MAU the latter was present in 16.4%, in proteinuria--in 62.8%. Type 2 diabetics had NAU in 33.6% cases, MAU--in 17.7%, proteinuria--in 48.7%. Subnormal GFR < 60 ml/min was found in 40% cases with NAU and MAU. Most patients with proteinuria had chronic disease of the kidneys of stage III-V In a normal creatinine concentration in blood serum subnormal GFR < 60 ml/min was observed in type 1 DM in 7.6, in type 2 DM--in 33% cases.


CONCLUSION
Prevalence of subnormal GFR in diabetic patients with NAU and MAU is rather high. This necessitates wide introduction of this index in screening, follow-up and classification of renal damage severity in DM as well as estimation of albuminuria/proteinuria.