Progression of diabetic nephropathy

Area of Science:

• Nephrology
• Diabetology
• Cardiovascular Medicine

Background:

• Diabetic nephropathy is a leading cause of end-stage renal disease.
• The rate of glomerular filtration rate (GFR) decline in diabetic nephropathy is highly variable.
• Key risk factors promoting GFR decline remain incompletely understood.

Purpose of the Study:

• To identify risk factors associated with the progression of diabetic nephropathy.
• To investigate the impact of arterial blood pressure, glycemic control, and cholesterol levels on GFR decline.
• To evaluate the effectiveness of antihypertensive treatment in managing diabetic nephropathy progression.

Main Methods:

• Longitudinal study of 301 type 1 diabetic patients with diabetic nephropathy over 7-14 years.
• Annual measurements of GFR (51Cr-EDTA), blood pressure, albuminuria, HbA1c, and serum cholesterol.
• Clinical diagnosis of diabetic nephropathy based on persistent albuminuria, retinopathy, and absence of other renal diseases.

Main Results:

• The average GFR decline was 4.0 mL/min/year, significantly lower (1.9 mL/min/year) in persistently normotensive patients.
• Multiple regression analysis showed positive correlations between GFR decline and mean arterial pressure, albuminuria, HbA1c, and cholesterol.
• A 'two-hit' model indicated a GFR decline of 1.5 mL/min/year in the lowest risk stratum versus 6.1 mL/min/year in the highest.

Conclusions:

• Antihypertensive treatment has improved diabetic nephropathy prognosis.
• Normotensive diabetic patients exhibit slower nephropathy progression.
• Modifiable factors like blood pressure, albuminuria, HbA1c, and cholesterol are significant promoters of diabetic nephropathy progression.