RESUMO
Angiotensin-converting enzyme (ACE) inhibitors have favourable effects on hypertension and diabetic nephropathy, but persistent use may result in incomplete blockade of the renin-angiotensin system. Long-term effects of dual blockade using the ACE inhibitor lisinopril and the long-acting angiotensin II receptor blocker (ARB) telmisartan on blood pressure and albumin excretion rate (AER) were evaluated. Patients with type 2 diabetes mellitus, hypertension (systolic blood pressure [SBP] >or=140 mmHg or diastolic blood pressure [DBP] >or=90 mmHg) and microalbuminuria (AER 30-300 mg/24h) received 20mg of lisinopril or 80 mg of telmisartan once a day for 24 weeks. Patients were then randomised to continuing treatment with the respective monotherapy or with lisinopril plus telmisartan for a further 28 weeks. Significant (P<0.001) declines in SBP (11.1 mmHg versus 10.0 mmHg), DBP (5.6 mmHg versus 5.3 mmHg) and AER (98 mg/24 h versus 80 mg/24 h) were achieved with lisinopril (n=95) or telmisartan (n=97), respectively, after 24 weeks. Subsequent treatment with lisinopril plus telmisartan for 28 weeks resulted in further significant reductions (P<0.001) in SBP, DBP and AER compared with either monotherapy. All treatments were well tolerated. Lisinopril plus telmisartan thus provides superior blood pressure and AER control than either monotherapy. We conclude that use of dual blockade may provide a new approach to prevention of diabetic nephropathy in patients with type 2 diabetes, hypertension and microalbuminuria.
