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Editorial Comment
Renoprotection by blocking the RAAS in diabetic nephropathyfact or fiction?
1 Steno Diabetes Center, Gentofte and 2 Faculty of Health Sciences, University of Aarhus, Aarhus, Denmark and 3 Department of Clinical Pharmacology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
Correspondence and offprint requests to: Peter Rossing, MD, DMSc, Steno Diabetes Center, Niels Steensens Vej 2, DK 2820 Gentofte, Denmark. Email: pro@steno.dk
Keywords: ACE inhibitors; albuminuria cohort study; angiotensin receptor antagonists; diabetic nephropathy; renoprotection
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Diabetic nephropathy is characterized by proteinuria, blood pressure elevation, a relentless decline in renal function and a high risk of cardiovascular disease. In 1992, based on clinical studies, it was suggested that angiotensin-converting enzyme inhibitors (ACEIs) offer renoprotection in diabetic nephropathyi.e. an effect protecting the kidney function above and beyond what was offered by similar blood pressure reduction with other antihypertensive agents [1]. This study was conducted in type 1 diabetic patients with moderately impaired renal function. The finding was confirmed and extended by the Collaborative Study Group [2] in a study with a median follow-up, 3 years; range, 1.84.8, demonstrating that in type 1 diabetic patients, ACEIs were associated with a 50% [95% confidence intervals (CI) 1870] reduced risk of dialysis/transplantation or death. Subsequently blockade of the reninangiotensin system (RAS) was investigated in type 2 diabetic patients using angiotensin II receptor blockers (ARB), and a
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