The Effects of Nebivolol on the NO-system in Patients With Essential Hypertension

Study Overview
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Brief Summary
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Investigators want investigate the following hypothesis: Nebivolol increases nitric oxide activity in the systemic circulation and the kidney The increased activity of nitric oxide during nebivolol treatment can be demonstrated by inhibition of NO synthesis with L-NMMA. We expect increased responses in blood pressure and sodium excretion is expected during nebivolol treatment compared to placebo.

Detailed Description
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Beta-blockers are no longer recommended as first line treatment in essential hypertension. Evidence mainly based on clinical trails with the non-vasodilating beta-blockers atenolol and propanolol points towards that beta-blockers have an increased risk of stroke compared to ACE-inhibitors, calcium channel blockers and thiazides. However, this Nebivolol is a third generation beta-blocker with vasodilating properties. Nebivolol decreases peripheral blood pressure to the same extend as other beta-blockers but in contrast to atenolol nebivolol also reduces central blood pressure. Furthermore nebivolol increases nitric oxide (NO) availability in forearm vessels, maybe through activation of beta-3 receptors. The nitric oxide system plays a central role in both renal sodium and water handling and regulation of vascular tone and blood pressure. It has not been investigated if nebivolol changes NO availability in the kidney. Investigators want investigate the following hypothesis: Nebivolol increases nitric oxide activity in the systemic circulation and the kidney The increased activity of nitric oxide during nebivolol treatment can be demonstrated by inhibition of NO synthesis with L-NMMA. Investigators expect increased responses in blood pressure and sodium excretion is expected during nebivolol treatment compared to placebo. Purpose The purpose of this study is to investigate the effects of nebivolol on renal handling of sodium and water (Glomerular filtration rate, urine production, free water clearance, excretion of proteins from epithelial sodium channels (u-ENaCαβγ) and aquaporin channels (u-AQP2) and sodium and potassium excretion), plasma concentrations of vasoactive hormones (renin, angiotensin II, aldosterone, vasopressin, atrial natriuretic peptide, brain natriuretic peptide and endothelin), central blood pressure, pulse wave velocity (PWV) and augmentation index, under basal conditions and during inhibition of nitric oxide synthesis in patients with essential hypertension. Design 25 patients with essential hypertension are recruited in this randomised, cross over, placebo-controlled, double blinded study with two treatment periods (nebivolol/placebo). Each subject will attend to two examination days. Four days prior to each examination days and on the morning of each examination day subjects are given either nebivolol 5 mg pr. day or placebo. During treatment periods subject are given a standardized diet. On the examination days subject are given L-NMMA, a nitric oxide synthase inhibitor, and renal function, central hemodynamic and vasoactive hormones are evaluated during basal conditions and during inhibition of nitric oxide synthesis. Perspectives This study is expected to contribute to increasing the knowledge about the mechanisms involved in the development and progression of cardiovascular disease. Beta-blockers are not recommended as first line treatment in essential hypertension but the results from this study may influence clinical treatment of essential hypertension in the future.

Official Title
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The Effects of Nebivolol on the NO-system in Patients With Essential

Conditions
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Essential Hypertension

Intervention / Treatment
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* Drug: Nebivolol
* Drug: placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Increased blood pressure (above 135 mmHg systolic or 85 mmHg diastolic in day time in 24 hour blood pressure measurement taking 5 or 10 mg amlodipine Men and women age 40 - 70 years informed consent Exclusion Criteria: diabetes mellitus glomerular filtration rate < 30 ml/min albuminuria > 1,5 g/l renogram which suggests secondary hypertension clinical signs of pheochromocytoma or increased p-metanephrines clinical important sign og heart, lung, liver, thyroid or neoplastic diseases clinical important deviations in routine blood samples or ECG drug or alcohol abuse pregnancy or nursery intolerance to nebivolol blood donation with a month of the first examination day inacceptable increase in blood pressure durin L-NMMA infusion (200/120) inacceptable side effects to amlodipine blood pressure increase above 170/105 on highest dose amlodipine (10 mg)

Ages Eligible for Study
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Minimum Age: 40 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Nebivolol<br>Tablet Nebivolol 5 mg (oral use) for 5 days | Drug: Nebivolol<br>* Tablet i blinded in capsula<br>* Other names: Tradename in Denmark: Hypoloc;|
| Placebo Comparator: Placebo<br>Inactive placebo given as tablet for 5 days | Drug: placebo<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Fractional excretion of sodium |  | 5 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Blood pressure | Both ambulatory blood pressure and office and central blood pressure before and during L-NMMA infusion | 5 days | 
| Pulse wave velocity | before and during L-NMMA infusion | 5 days | 
| Plasma renin concentration | before and during L-NMMA infusion | 5 days | 
| Plasma aldosterone concentration | Before and during L-NMMA infusion | 5 days | 
| Plasma angiotensin II concentration | Before and during L-NMMA infusion | 5 days | 
| Plasma Endothelin concentration | Before and during L-NMMA infusion | 5 days | 
| Plasma brain natriuretic peptide concentration | Before and during L-NMMA infusion | 5 days | 
| Plasma vasopressin concentration | Before and during L-NMMA infusion | 5 days | 
| Glomerular filtration rate | Before and during L-NMMA infusion | 5 days | 
| Urinary excretions of epithelial sodium channels | Before and during L-NMMA infusion | 5 days | 
| Urinary excretions of aquaprorin-2 | Before and during L-NMMA infusion | 5 days | 
| 24-hour ambulatory blood pressure |  | 5 days | 
| Free water clearance | Before and during L-NMMA infusion | 5 days | 
| Urine flow | Before and during L-NMMA infusion | 5 days | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Essential hypertension, Nitric oxide, Nebivolol, Fractional excretion of sodium