Angiotensin II receptor blockers (ARBs) have been demonstrated to reduce morbidity and/or mortality in patients with chronic heart failure (CHF), acute myocardial infarction (AMI), type 2 diabetes, and hypertension. Although as a class ARBs share a common mechanism of action, potency among the agents varies. Higher-potency ARBs (candesartan, irbesartan, olmesartan, and telmisartan) may demonstrate improved 24-hour blood pressure control, suggesting that these agents may have superior clinical event reduction potential versus lower-potency agents (eprosartan, losartan, and valsartan). We conducted a meta-analysis of randomized, controlled trials that evaluated the effect of ARBs on clinical outcomes. A systematic literature search of MEDLINE from 1966 through December 2006 was conducted using specific search terms. Studies that met the following criteria were included: randomized; not angiotensin-converting enzyme (ACE) inhibitor-controlled; incorporation of monotherapy with ARBs in 1 or more of the treatment..