Effect of High and Low Sodium Diets on Blood Pressure in Hypertensive Patients Treated With Aliskiren

Phase 4

Completed

Brief Summary: This study will compare the effects of high and low level sodium (salt) diets on blood pressure in patients with hypertension (high blood pressure) who are taking aliskiren 300 mg.

Recruitment & Eligibility

Inclusion Criteria

Male or female outpatients 18-60 years old
Patients with systolic hypertension who met the 24 hour Ambulatory Blood Pressure Monitoring (ABPM) criteria (ABPM mean daytime Systolic Blood Pressure (SBP) >= 135 mmHg and < 160 mmHg)

Exclusion Criteria

Overt heart failure (HF) or a history of heart failure within preceding 6 months.
Unstable angina pectoris.
Type 1 or Type 2 diabetes mellitus or abnormal hemoglobin A1c(HbA1c)
Body mass index (BMI) > 30 kg/m2
Subjects taking more than 2 antihypertensive medications.
Use of other investigational drugs within 30 days of the time of enrollment
Use of Tamsulosin hydrochloride and other alpha blockers.
Use of Antiarrhythmic drugs, including digoxin.
History of MI or cardiovascular attack (CVA) within the preceding 6 months.
History of malignancy of any organ system, treated or untreated, within the past 5 years with the exception of localized basal cell carcinoma of the skin
Pregnant or nursing (lactating) women

Arm && Interventions

Group	Intervention	Description
Diet Sequence High/Low Sodium	Aliskiren	Patients on high sodium (\>= 200 mmol/day) diet for the first 4 weeks and on low sodium diet ( \<= 100 mmol/day) for the next 4 weeks. \[with Aliskiren 300 mg\]
Diet Sequence Low/High Sodium	Aliskiren	Patients on low sodium diet ( \<= 100 mmol/day) for the first 4 weeks and high sodium (\>= 200 mmol/day) diet for the next 4 weeks. \[with Aliskiren 300 mg\]

Primary Outcome Measures

Name	Time	Method
Mean 24 Hour Ambulatory Systolic Blood Pressure (MASBP) in Systolic Hypertensive Patients Treated With Aliskiren (300 mg) for 4 Weeks on a High Sodium Diet Versus 4 Weeks on a Low Sodium Diet	Week 4 and week 8 (4 weeks after crossover)	The primary objective of the study was to assess mean 24 hour ambulatory systolic blood pressure (MASBP) in systolic hypertensive patients treated with aliskiren (300 mg) for 4 weeks on a high sodium diet versus 4 weeks on a low sodium diet. \[At week 4 patients crossed over from low to high sodium diet and vice versa for 4 weeks. MASBP for patients on high sodium diet versus low sodium diet was also analyzed at week 8 (4 weeks after crossover).\]

Secondary Outcome Measures

Name	Time	Method
Mean 24 Hour Ambulatory Diastolic Blood Pressure (MADBP) in Systolic Hypertensive Patients Treated With Aliskiren (300 mg) for 4 Weeks on a High Sodium Diet Versus 4 Weeks on a Low Sodium Diet	Week 4 and week 8 (4 weeks after crossover)	To evaluate the mean 24 hour ambulatory diastolic blood pressure (MADBP) in systolic hypertensive patients treated with aliskiren (300 mg) for 4 weeks on a high sodium diet versus 4 weeks on a low sodium diet. \[At week 4 patients crossed over from low to high sodium diet and vice versa for 4 weeks. MADBP for patients on high sodium diet versus low sodium diet was also analyzed at week 8 (4 weeks after crossover).\]
Percentage of Responders Defined as MASBP <130 mm Hg or a Decrease From Baseline in MASBP of ≥20 mm Hg in Systolic Hypertensive Patients Treated With Aliskiren (300 mg) for 4 Weeks on a High Sodium Diet Versus 4 Weeks on a Low Sodium Diet	Week 4 and Week 8 (4 weeks after crossover)	To evaluate the percentage of responders defined as MASBP \< 130 mm Hg or a decrease in MASBP from baseline of ≥20 mm Hg in systolic hypertensive patients treated with aliskiren (300 mg) for 4 weeks on a high sodium diet versus 4 weeks on a low sodium diet. \[At week 4 patients crossed over from low to high sodium diet and vice versa for 4 weeks. Percent response for patients on high sodium diet versus low sodium diet was also analyzed at week 8 (4 weeks after crossover).\]