Glomerular function and microalbuminuria in children with insulin-dependent diabetes

Area of Science:

• Pediatric Nephrology
• Diabetology
• Clinical Research

Background:

• Diabetic nephropathy is a major complication of diabetes mellitus.
• Early detection of renal abnormalities in children with diabetes is essential for timely intervention.
• Understanding the relationship between metabolic control and renal function in pediatric diabetes is critical.

Purpose of the Study:

• To evaluate renal function, including glomerular filtration rate (GFR) and renal plasma flow (RPF), in children with type 1 diabetes.
• To compare renal function parameters between diabetic children and healthy controls.
• To investigate the correlation between renal function and glycemic control (HbA1C, blood glucose levels, and maximal blood glucose excursion).

Main Methods:

• Assessed GFR (inulin and creatinine clearances) and RPF (PAH clearance) in 45 diabetic children and controls.
• Measured resting urinary albumin excretion (UAE).
• Correlated renal parameters with metabolic control indicators (HbA1C, mean, post-prandial, and maximal blood glucose).

Main Results:

• Diabetic children exhibited significantly increased GFR and RPF compared to controls.
• Hyperfiltration (GFR > 160 ml/min/1.73 m2) was observed in 61% of diabetic children, independent of diabetes duration.
• GFR showed a weak correlation with HbA1C and mean/post-prandial blood glucose, but a strong correlation with maximal blood glucose excursion.
• Elevated UAE was found in 5 children; no clear relationship with metabolic indexes was established.

Conclusions:

• Renal abnormalities, particularly hyperfiltration, are frequent in children with early-onset and short-duration diabetes.
• Maximal blood glucose excursion appears to be a significant factor associated with increased GFR.
• Systematic evaluation of renal parameters is recommended for pediatric diabetic populations to detect early functional changes.