Double Blind Crossover Comparison of Diuretics in the Young
Recruitment status was: Recruiting
The principle objective of the study is to determine whether low-renin (i.e. salt sensitive) hypertension at a young age is caused by the kidneys hanging onto too much salt as a result of an over active salt pump in the kidney.
The kidneys have four different salt pumps, and each is blocked by a different type of diuretic (salt losing tablet)If one out of the four is overactive, we would expect patients to respond much better to one diuretic than to the alternatives - rather than responding equally well to all available types of diuretic.
Drug: Bendroflumethiazide 2.5mg - 5mg
Drug: Amiloride 20-40mg
Drug: Spironolactone 50-100mg
Drug: Frusemide 20-40mg
Drug: Bendroflumethiazide 1.25-2.5mg/ Amiloride 10-20mg combined
|Study Design:||Allocation: Randomized
Intervention Model: Crossover Assignment
Primary Purpose: Treatment
|Official Title:||Double Blind Crossover Comparison od Diuretics in Young Patients With Low Renin Hypertension|
- Difference in systolic blood pressure for subjects' best drug and second best drug.
- Difference in plasma renin for subjects' best drug and second best drug.
- Predictions of best drug
|Study Start Date:||August 2006|
|Estimated Study Completion Date:||July 2007|
Studies suggest that patients with low renin hypertension respond better to diuretics than other hypertensive drug groups. The aim of the study is to rotate patients through the four main diuretic groups and see if it is possible to identify the most effective diuretic for this group, as measured by a >=10mgHg decrease in Systolic blood pressure in one specific group a compared to the others.
As most caucasians with Low renin hypertension are older (>55), presentation with this type of hypertension at a younger age suggests the presence of substantial genetic variation in order to cause the atypical presentation. It is hoped that by identifying the best diuretic for these patients we will also be able to identify:
- Whether the young low-renin hypertensives can be sub-classified according to their most effective diuretic;
- Whether this sub-classification helps us to identify the genes and mutations responsible, since these are to expected to be in the so-called sodium channels (i.e. salt pumps)which the kidneys use to prevent salt being excreted in the urine.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00429897
|University of Cambridge - Addenbrookes Hospital|
|Cambridge, United Kingdom, CB2 2QQ|
|Principal Investigator:||Morris J Brown, Proffessor||Cambridge University|