- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00746902
Study of the Relationships Between Refractory Hypertension, Overweight/Obesity and Sleep Apnea Syndrome (RHOOSAS)
The purpose of the study is to investigate the links between blood pressure (BP), overweight or obesity, and sleep apnea syndrome (SAS), by studying a large cohort of subjects suffering from refractory hypertension.
Primary objective
- To compare plasmatic leptin levels in patients suffering from refractory hypertension depending on whether or not they experience SAS.
Secondary objectives
- To ascertain what determines the difference in plasmatic leptin concentrations in patients suffering from refractory hypertension depending on whether or not they experience SAS.
- To characterise BP readings (from clinical and ambulatory (ABPM) measurements) in patients suffering from refractory hypertension depending on whether or not they experience SAS.
- To characterise metabolic parameters (lipids, glycaemia, adiponectin) and sympathetic nervous system effectors (adrenaline, noradrenaline and metanephrines) in patients suffering from refractory hypertension depending on whether or not they experience SAS.
- To characterise BP readings, metabolic parameters and sympathetic nervous system effectors in patients suffering from refractory hypertension according to the severity of the SAS (in those who experience this problem).
- To study, in patients with both SAS and refractory hypertension, the impact of nasal continuous positive airway pressure (CPAP) treatment on BP readings, metabolic parameters and sympathetic nervous system effectors, by comparing those who are compliant with the CPAP regimen with those who are non-compliant.
Study Overview
Detailed Description
A number of factors predispose subjects to both hypertension and SAS, including overweight/obesity and hyperinsulinism. The pathogenesis of concomitant overweight/obesity and hypertension is multifactorial. There is an independent relationship between the degree of insulin resistance and the severity of SAS. A number of studies have suggested that hormones secreted by adipose tissue are involved in the pathogenesis of both hypertension and SAS, and overweight/obesity has been shown to be associated with elevated leptin levels coupled with reduced adiponectin levels.
Leptin is produced in adipose tissue and its levels rise with overweight/obesity due to peripheral resistance to its action. A number of studies have detected high leptinemia in both hypertensives and people suffering from SAS. Leptin may activate the sympathetic nervous system and promote SAS-related hypertension.
Adiponectin which is also produced in adipose tissue has beneficial activities, notably on atherogenesis. A relationship between hypertension and adiponectin has yet to be demonstrated.
Unlike leptin, adiponectin levels do not seem to be elevated in patients with SAS.
In terms of treatment, a number of studies have shown that CPAP has a positive effect on BP readings. Although this effect is modest, it is greater in subjects with SAS and rises with the severity of this condition. The effects of CPAP on plasmatic leptin and adiponectin levels are as yet unknown.
Study Type
Enrollment (Actual)
Phase
- Phase 3
Contacts and Locations
Study Locations
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-
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Grenoble, France
- University Hospital
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-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Patients of either gender, of between 18 and 70
- Suffering from refractory hypertension as defined by persistent clinical hypertension (> 140/90 mm Hg according to two different readings 24 hours apart) despite at least three classes of antihypertensive drugs (including a thiazide diuretic) at appropriate doses.
- Recruited in the Cardiology Departments of the University Hospitals in Grenoble, Toulouse, Marseille and Poitiers, and in the Mozart Clinic in Paris.
- Outpatients
- Patients who have signed the consent form
- Patients affiliated to or beneficiary of the social security system
Exclusion Criteria:
- Failure to fulfil the inclusion criteria
- Treated SAS, whatever the form of the treatment
- Disease which might affect BP regulation, including Parkinson's disease, kidney or heart transplantation, dysautonomia, severe heart failure
- Atrial fibrillation or regular extrasystole (> 10/minute)
- Night- or shift-work
- Pregnant and breast-feeding women
- Patients under legal guardianship
- Incarcerated patients or adults protected by the law
- Hospitalised patients
- Ongoing participation in another clinical research study
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: 1
Arm 1: Active CPAP, a nasal continuous positive airway pressure
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Active nCPAP
|
Sham Comparator: 2
Arm 2 : Sham CPAP :Placebo/CPAP
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Active nCPAP
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
leptinemia
Time Frame: inclusion visit, visit month 3, visit month 6 or 9
|
inclusion visit, visit month 3, visit month 6 or 9
|
Secondary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
BP readings (clinical and ABPM), metabolic parameters (lipids, glycaemia, adiponectin) and sympathetic nervous system effectors (adrenaline, noradrenaline and metanephrines).
Time Frame: inclusion visit, visit month 3, visit month 6 or 9
|
inclusion visit, visit month 3, visit month 6 or 9
|
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Jean-Philippe BAGUET, Professor, University Hospital, Grenoble
Publications and helpful links
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 0803
- 2008-A00292-53 (Registry Identifier: ID RCB)
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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