title: The natural course of microalbuminuria in insulin-dependent diabetes: a 10-year prospective study.
abstract: The purpose of this study was to describe the clinical course in patients followed right from the onset of microalbuminuria to the development of diabetic nephropathy. A 10-year prospective follow-up of 209 consecutive normotensive insulin-dependent diabetic patients with normal urinary albumin excretion (UAE < 30 mg 24 h-1), age 34 (18-50) years and duration of diabetes 17 (10-30) years was performed. Twenty-four-hour urinary albumin excretion was measured every 4 months, glycated haemoglobin and supine blood pressure was measured annually. Two-hundred (96%) patients completed 10 (range 5-10) years follow-up. Twenty-nine (15%) patients developed persistent microalbuminuria (UAE 30-300 mg 24 h-1). Eight of these have progressed to nephropathy and one had died of diabetic nephropathy. Multiple stepwise logistic regression analysis demonstrated baseline urinary albumin excretion (p = 0.0016) and glycated haemoglobin (p = 0.0014) but not blood pressure as predictors of development of microalbuminuria within the following 10 years. The median annual increase in urinary albumin excretion was 27 (range 17-65) % in the 29 patients developing microalbuminuria. The median duration from onset of microalbuminuria to development of nephropathy was 7 years. The prevalence of patients receiving antihypertensive treatment (BP > 140/90 mmHg) increased from 10% at onset of microalbuminuria to 45% 4 years after onset of microalbuminuria. The prevalence of patients with proliferative retinopathy increased from 7% at onset of microalbuminuria to 28% 4 years after onset of microalbuminuria.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Steno Diabetes Center, Copenhagen, Denmark.
authors.forename: E R
authors.initials: ER
authors.lastname: Mathiesen
authors.forename: B
authors.initials: B
authors.lastname: Rønn
authors.forename: B
authors.initials: B
authors.lastname: Storm
authors.forename: H
authors.initials: H
authors.lastname: Foght
authors.forename: T
authors.initials: T
authors.lastname: Deckert
mesh_terms: D000293:Adolescent; D000328:Adult; D000419:Albuminuria / Q000209:etiology / Q000503:physiopathology*; D003922:Diabetes Mellitus, Type 1 / Q000150:complications / Q000652:urine*; D003928:Diabetic Nephropathies / Q000209:etiology*; D003930:Diabetic Retinopathy / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D016896:Treatment Outcome