Clinical studies have demonstrated the benefit of angiotensin-converti
ng enzyme (ACE) inhibitors in retarding the progression of renal disea
se, stabilizing or reducing urinary albumin excretion, and improving t
he glomerular filtration rate beyond that attributable to their antihy
pertensive effects. Based on their effectiveness in reducing the risks
of diabetic nephropathy, ACE inhibitors are recommended as first-line
therapy for all hypertensive diabetic patients with microalbuminuria
or more advanced stages of renal nephropathy. They are similarly recom
mended for nondiabetic patients with renal disease based on their effe
ctiveness in slowing the progression of renal dysfunction in patients
with various forms of renal disease.