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Effects of High- and Low-Sodium Diets on Ambulatory Blood Pressure in Patients With Hypertension Receiving Aliskiren

Dietary sodium reduction and, as necessary, pharmacologic treatment are recommended for hypertension management. This prospective, randomized, open-label, blinded-end point, multicenter, crossover study investigated the effect of dietary sodium intake on mean ambulatory systolic blood pressure (maSBP) in patients with hypertension receiving aliskiren 300 mg once daily. Following a 2- to 4-week washout period, patients were randomized to a high- (≥200 mmol/d) or low- (≤100 mmol/d) sodium diet and were started on aliskiren, 300 mg/d. After 4 weeks, patients were crossed over to the alternate diet for an additional 4 weeks. The primary efficacy variable was change in maSBP between diets. During treatment with aliskiren, maSBP was significantly lower with the low-sodium diet compared with the high-sodium diet (least squares mean difference, 9.4 mm Hg; 95% CI, 7.5-11.4; P < .0001). The percentage of patients achieving a maSBP response to aliskiren (<130 mm Hg or a ≥20-mm Hg reduction from baseline) was greater with the low- (76.5%) versus the high-sodium diet (42.6%; P < .0001). Overall, 40.9% patients had ≥1 adverse event and the rates were similar between groups. In this study, aliskiren was well tolerated and a low-sodium diet accentuated its antihypertensive effect.