Effect of Aliskiren and Hydrochlorothiazide on Kidney Oxygenation in Patients With Hypertension
Recruitment status was: Recruiting
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
|Official Title:||Effect of Aliskiren 300mg and Hydrochlorothiazide 25mg on Kidney Oxygenation in Patients With Stage 1 and 2 Hypertension: a BOLD-MRI Study|
- Renal oxygenation measured by renal BOLD-MRI after chronic treatment with aliskiren or hydrochlorothiazide [ Time Frame: up to one year ]A renal BOLD-MRI is performed after administration of aliskiren or hydrochlorothiazide and R2* measures are taken. The R2* values of the renal medulla and the renal cortex with both drugs are then compared with each other.
|Study Start Date:||October 2011|
|Estimated Study Completion Date:||October 2012|
|Estimated Primary Completion Date:||October 2012 (Final data collection date for primary outcome measure)|
|Active Comparator: Aliskiren||
Drug therapy will be started with an initial 2 weeks on Aliskiren 150 mg followed by a titration to 300 mg Aliskiren if the treatment is well tolerated. A first baseline measurements will be performed before initiating therapy and a second after 8 weeks of treatment (24h after last drug intake) to assess the chronic effect.
Other Name: Rasilez
|Active Comparator: Hydrochlorothiazide||
Drug therapy will be started with an initial 2 weeks HCTZ 12.5 mg followed by a titration to 25 mg HCTZ if the treatment is well tolerated. A first baseline measurements will be performed before initiating therapy and a second after 8 weeks of treatment (24h after last drug intake) to assess the chronic effect.
Other Name: Esidrex
36 patients with arterial hypertension stage 1-2 (blood pressure: 140/90 and 180/110 mm Hg) will be included in this study and randomized to two groups of 18 patients each: one group will receive RASILEZ 300mg (aliskiren) and one group ESIDREX 25mg (hydrochlorothiazide).
After a two week washout of antihypertensive drugs, baseline and the chronic effect (8 week study drug) of each group will be studied with precise renal hemodynamic measurements (inulin clearance, PAH renal plasma and blood flow, sodium and endogenous lithium excretion, plasma renin, plasma aldosterone, urinary sodium and potassium) and assessment of renal oxygenation with BOLD-MRI (blood oxygen level detection - magnetic resonance imaging).
Drug therapy will be started with an initial 2 weeks on Rasilez 150 mg or HCTZ 12.5 mg followed by a titration to 300 mg Rasilez and 25 mg HCTZ if the treatment is well tolerated. In both groups: a first baseline measurements will be performed before initiating therapy and a second after 8 weeks of treatment (24h after last drug intake) to assess the chronic effect.
Patients already on treatment with antihypertensive drugs can be included in this study, but will undergo a 'wash-out' period of two weeks. After obtaining informed consent, baseline physical examination and office blood pressure measurement will be performed. Office blood pressure will be measured according to the guidelines of the European Society on Hypertension and European Society of Cardiology (ESH-ESC practice guidelines) by an experienced physician. Moreover, patients will measure their home blood pressure twice daily: after 5 minutes of sitting quietly, three measures spaced by 1-2 minutes will be taken in the morning and in the evening. For this purpose, an Omron 705 IT device will be provided to the participants; this device has been widely tested in clinical practice and has been validated for use in clinical studies (12).
Throughout the study, the participants will continue his/her regular diet. The goal should be to keep the salt intake as stable as possible during the study, since salt intake alters the R2* signal. Salt intake will be verified each time before BOLD-MRI measurement by a 24h urine collection (dosing volume, creatinine- and sodium-concentration).
Please refer to this study by its ClinicalTrials.gov identifier: NCT01519635
|Contact: Michel Burnier, Professor||0041213141129||Michel.Burnier@chuv.ch|
|Centre Hospitalier Universitaire Vaudois||Recruiting|
|Lausanne, Vaud, Switzerland, 1004|
|Contact: Michel Burnier, Professor 0041213141129 firstname.lastname@example.org|
|Sub-Investigator: Valentina Forni, MD|
|Principal Investigator:||Michel Burnier, Professor||Centre Hospitalier Universitaire Vaudois|