OBJECTIVE -To assess and compare the long-term effects of the combination of candesartan and lisinopril with high-dose lisinopril on systolic blood pressure in patients with hypertension and diabetes.RESEARCH DESIGN AND METHODS -This was a prospective, randomized, parallel-group, double-blind, double-dummy study with a 12-month follow-up. Drug therapy was either lisinopril 40 mg once daily or dual-blockade treatment with candesartan 16 mg once daily and lisinopril 20 mg once daily. The study comprised 75 type 1 and type 2 diabetic patients aged 35-74 years. The main outcome measures were seated and 24-h ambulatory systolic blood pressure.RESULTS -Reduction in systolic blood pressure (24-h systolic blood pressure) reduction was obtained in both treatment arms (mean reduction at final follow-up: dual blockade 6 mmHg vs. lisinopril 2 mmHg), but no significant difference was found between dual-blockade and lisinopril 40 mg once daily (P ϭ 0.10). Both treatments were generally well tolerated, and similar low rates of side effects were found in the two groups.CONCLUSIONS -There was no statistically significant difference between lisinopril 40 mg once daily and lisinopril 20 mg in combination with candesartan 16 mg once daily in reducing systolic blood pressure in hypertensive patients with diabetes.
Diabetes Care 28:273-277, 2005D ual blockade of the renin-angiotensin system was opted for based on the principle of obtaining the broadest and most efficient blockade of the effects of angiotensin II by using the combination of an ACE inhibitor and an angiotensin II receptor blocker (AIIA).By combining two different pharmacological principles and inhibiting both the ACE and the angiotensin II type 1 receptor, it seems possible to arrive at a treatment regimen that inhibits both the production and the action of angiotensin II and serves as an efficient antihypertensive therapy. The Candesartan and Lisinopril Microalbuminuria (CALM) study was among the first to show an additional effect from dual blockade on blood pressure in a population of type 2 diabetic patients with microalbuminuria over a 12-week follow-up period (1). Following the CALM study, several small-scale studies indicated that using dual blockade in treating type 1 and type 2 diabetic patients might produce additional clinical effects on both blood pressure and albumin excretion (2-4). Moreover, one large-scale study in nondiabetic patients with nephropathy has also shown that dual-blockade treatment has an effect in the long term (5).However, several important clinical questions remain unresolved: 1) What are the clinical effects of dual blockade compared with an efficient dosage titration of an ACE inhibitor? 2) Does the effect of dual blockade persist over a longer period of time? 3) What are the long-term safety and tolerability characteristics of the two treatment regimes?Thus, the primary objective of the CALM II study was to compare over a 12-month period the results of adding either candesartan cilexetil 16 mg or lisinopril 20 mg to concomitant antihy...