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Glomerular hyperfiltration and renal disease progression in type 2 diabetes
Piero Ruggenenti1, Esteban L Porrini, Flavio Gaspari
1Clinical Research Center for Rare Diseases Aldo & Cele Daccò, Mario Negri Institute for Pharmacological Research, Bergamo, Italy. pruggenenti@ospedaliriuniti.bergamo.it
Diabetes Care
|July 10, 2012
Summary
In type 2 diabetes, hyperfiltration is linked to faster kidney function decline and increased risk of nephropathy. Ameliorating hyperfiltration may be renoprotective, warranting further investigation.
Area of Science:
- Nephrology
- Diabetology
- Cardiovascular Medicine
Background:
- Type 2 diabetes is a leading cause of chronic kidney disease.
- Hyperfiltration, or elevated glomerular filtration rate (GFR), is observed in a subset of diabetic patients.
- Understanding the role of hyperfiltration in diabetic nephropathy is crucial for developing renoprotective strategies.
Purpose of the Study:
- To determine the prevalence and predictors of hyperfiltration in type 2 diabetic patients with normo- or microalbuminuria.
- To assess the association between hyperfiltration and subsequent GFR decline and nephropathy progression.
- To investigate factors influencing hyperfiltration and its potential impact on renal outcomes.
Main Methods:
- A longitudinal study of 600 hypertensive type 2 diabetic patients with low albuminuria levels.
- GFR was measured using iohexol plasma clearance, and albuminuria by nephelometry.
- Glucose disposal rate (GDR) was assessed via hyperinsulinemic euglycemic clamp; blood pressure (BP) and HbA1c were controlled to target levels.
Main Results:
- Over a median of 4 years, GFR declined by 3.37 mL/min/1.73 m(2) per year.
- Fifteen percent of patients exhibited hyperfiltration at baseline.
- Persistent hyperfiltration was associated with a 2.16-fold increased risk of progressing to micro- or macroalbuminuria, independent of ACE inhibition.
- Amelioration of hyperfiltration correlated with improved BP, metabolic control, GDR, and slower GFR decline.
Conclusions:
- Despite intensive treatment, type 2 diabetic patients experience significant GFR decline.
- Hyperfiltration is a distinct subgroup phenomenon that may accelerate renal function loss and nephropathy.
- Further research is needed to confirm if ameliorating hyperfiltration offers renoprotection.
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