Microalbuminuria (urinary albumin excretion equal to 30-300 mg/24 h) is a reliable indicator of premature cardiovascular mortality in diabetic patients and in the general population. In insulin-dependent and non-insulin-dependent diabetes mellitus microalbuminuria is a marker of initial diabetic nephropathy and predicts the evolution toward renal insufficiency. In essential hypertension the clinical and prognostic role of microalbuminuria is more controversial. While it is a recognised marker of cardiovascular complications and a reliable predictor of ischaemic heart disease, its prognostic value on the risk of progressive renal alterations is still uncertain because no prospective studies, taking microalbuminuria as a selection criterion and renal insufficiency as an end point, are available. Blood pressure control with antihypertensive drugs is accompanied by a reduction in urinary albumin excretion. The favourable effects of antihypertensive agents on microalbuminuria appear to be proportional
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