Effect of aliskiren addition to amlodipine on ankle edema in hypertensive patients: a three-way crossover study.
Author(s): Fogari R, Zoppi A, Mugellini A, Maffioli P, Lazzari P, Monti C, Derosa G
Affiliation(s): Clinica Medica II, University of Pavia, Centro Ipertensione e Fisiopatologia Cardiovascolare, Department of Internal Medicine and Therapeutics , Pavia , Italy. email@example.com
Publication date & source: 2011-06, Expert Opin Pharmacother., 12(9):1351-8. Epub 2011 Apr 22.
Publication type: Randomized Controlled Trial
OBJECTIVE: The aim of this study was to assess the effect of aliskiren and amlopidine on ankle-foot volume (AFV) and pretibial subcutaneous tissue pressure (PSTP). RESEARCH DESIGN AND METHODS: After 4-week placebo, 120 outpatients with grade 1 - 2 hypertension were randomized to amlodipine 10 mg or aliskiren 300 mg or their combination for 8 weeks in three crossover periods. At the end of each treatment, blood pressure, AFV, PSTP, plasma renin activity (PRA) and norepinephrine were assessed. RESULTS: Both monotherapies similarly reduced systolic blood pressure (SBP; p < 0.001) and diastolic blood pressure (DBP; p < 0.001), but the reduction was greater with amlodipine/aliskiren combination (SBP: - 24.6 mmHg, p < 0.001 vs monotherapy; DBP: -20.9 mmHg, p < 0.01 vs monotherapy). Amlodipine increased both AFV (+ 28.4%, p < 0.01) and PSTP (+ 80.4%, p < 0.01), while the combination produced a less marked increase in AFV (+ 6.6%, p < 0.01 vs amlodipine) and PSTP (+ 20.1%, p < 0.01 vs amlodipine). Plasma norepinephrine increased with amlodipine (+ 53.5%, p < 0.01) and this increase was not reduced by aliskiren addition. PRA was unaffected by amlodipine, while it was reduced by both aliskiren monotherapy (- 77.7%, p < 0.01) and aliskiren/amlodipine combination (- 75.7%, p < 0.01). CONCLUSIONS: Direct renin inhibition by aliskiren partially counteracts the microcirculatory changes responsible for calcium-channel-induced edema formation, possibly through preferential vasodilation of venous capacitance vessels.