Maximal Dose of Angiotensin Converting Enzyme (ACE) Inhibitor for Treatment of Diabetic Kidney Disease

The primary aim is to evaluate the anti proteinuric effect of increasing doses of the ACE inhibitor, lisinopril: 20, 40 and 60 mg daily in type 1 diabetic patients with hypertension and diabetic nephropathy. The secondary aim is to evaluate the effect on blood pressure (24 hour ambulatory blood pressure) and kidney function (glomerular filtration rate (GFR)). The tertiary aim is to evaluate differences in response to treatment according to ACE/insertion/deletion (ID)-genotypes and other genetic variants in the genes of the renin angiotensin system.