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Clinical Trial
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't
Dual renin-angiotensin system blockade at optimal doses for proteinuria.
Kidney International 2002 September
BACKGROUND: The antiproteinuric effect of combining the angiotensin-converting enzyme (ACE) inhibitor lisinopril and the angiotensin II (Ang II) antagonist losartan was compared to that of the optimal antiproteinuric doses of monotherapy.
METHODS: To this purpose, lisinopril and losartan were studied in 9 nondiabetic renal patients with median proteinuria 4.5 g/day (95% CI, 3.5, 6.4), creatinine clearance of 80 mL/min (95% CI, 66, 96), and mean arterial pressure (MAP) of 102 mm Hg (95% CI, 93, 112). First, in two protocols with six-week treatment periods per dose, the optimal antiproteinuric dose of each drug was established in each patient. Losartan and lisinopril were used in randomized order, each preceded by a baseline period without medication. The doses of losartan (mg/day) were 50, 100, 150, and again 50. The lisinopril doses were 10, 20, 40, and again 10. After the second protocol, patients were treated with a combination, using the optimal antiproteinuric doses established for the individual drugs.
RESULTS: The antiproteinuric response by losartan was optimal at 100 mg (-46%; 95% CI, -60, -24%), being larger than at the 50 mg dose (-27%; 95% CI, -42, -4%, P < 0.05), but not different from the 150 mg dose (-46%; 95% CI, -58; -20%). Proteinuria decreased further at each up-titration step of lisinopril to -75% (95% CI, -85, -43%) at the 40 mg dose. Combination therapy reduced proteinuria more effectively (-85%; 95% CI, -96, -58) than monotherapy with losartan, and to a lesser extent than with lisinopril. Optimal blood pressure responses were obtained at similar doses.
CONCLUSIONS: Dose-titration with a renin-angiotensin system blocker, followed by add-on therapy is highly effective in order to reduce proteinuria. The safety of this regimen needs to be addressed in future studies.
METHODS: To this purpose, lisinopril and losartan were studied in 9 nondiabetic renal patients with median proteinuria 4.5 g/day (95% CI, 3.5, 6.4), creatinine clearance of 80 mL/min (95% CI, 66, 96), and mean arterial pressure (MAP) of 102 mm Hg (95% CI, 93, 112). First, in two protocols with six-week treatment periods per dose, the optimal antiproteinuric dose of each drug was established in each patient. Losartan and lisinopril were used in randomized order, each preceded by a baseline period without medication. The doses of losartan (mg/day) were 50, 100, 150, and again 50. The lisinopril doses were 10, 20, 40, and again 10. After the second protocol, patients were treated with a combination, using the optimal antiproteinuric doses established for the individual drugs.
RESULTS: The antiproteinuric response by losartan was optimal at 100 mg (-46%; 95% CI, -60, -24%), being larger than at the 50 mg dose (-27%; 95% CI, -42, -4%, P < 0.05), but not different from the 150 mg dose (-46%; 95% CI, -58; -20%). Proteinuria decreased further at each up-titration step of lisinopril to -75% (95% CI, -85, -43%) at the 40 mg dose. Combination therapy reduced proteinuria more effectively (-85%; 95% CI, -96, -58) than monotherapy with losartan, and to a lesser extent than with lisinopril. Optimal blood pressure responses were obtained at similar doses.
CONCLUSIONS: Dose-titration with a renin-angiotensin system blocker, followed by add-on therapy is highly effective in order to reduce proteinuria. The safety of this regimen needs to be addressed in future studies.
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