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Renal Denervation in Treatment Resistant Hypertension
In patients with treatment resistant hypertension renal nerve ablation emerged as an effective interventional approach of treating hypertensive disease with a progressively increasing fall in blood pressure. Decreased activity of the sympathetic nervous system is one of the major underlying pathogenetic mechanism of the fall in blood pressure but the precise mechanisms that causes the fall in blood pressure in the short-term and, in particular, long-term remains elusive. The objective of the study is to understand the pathogenetic mechanisms of renal denervation beyond the reduced activity of the sympathetic nervous system. In 100 hypertensive patients most advanced technology will be applied, before and repeatedly after renal denervation, throughout the follow-up period of 1 year. Systemic activity of the renin angiotensin aldosterone system, renal perfusion (by MRI spin labeling technique), local activity of the renin angiotensin system in the kidney (urinary angiotensinogen concentrations), sodium excretion and total sodium content (23 Na-MRI technique) and vascular remodelling of small (retinal arterioles 50 - 150 µm) and large arteries (carotid - femoral pulse wave velocity and augmentation index, both measured over 24 hours) will be assessed. Identification of the pathogenetic mechanisms involved in the fall in blood pressure after renal denervation may help to identify those hypertensive patients that profit most from renal nerve ablation in terms of blood pressure reduction.
The investigators propose the following hypotheses why a progressive decrease in blood pressure happens, in addition to the decreased activity of the central nervous system, after renal nerve ablation:
Short term effects:
A)Preservation of renal function and perfusion B)Reduction of local RAS activity in the kidney C)Exaggerated sodium excretion immediately after renal nerve ablation
Long term effects:
D)Decrease of total sodium content after 6 and 12 months E)Improvement of vascular wall properties after 6 and 12 months
Studie Overzicht
Toestand
Conditie
Interventie / Behandeling
Studietype
Inschrijving (Werkelijk)
Contacten en locaties
Studie Locaties
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Erlangen, Duitsland, 91054
- Clinical Research Unit, Department of Nephrology and Hypertension, University of Erlangen-Nürnberg
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Homburg/Saar, Duitsland, 66421
- Klinik für Innere Medizin, Kardiologie, Angiologie und Internistische Intensivmedizin, Universitätsklinikum des Saarlandes
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Bemonsteringsmethode
Studie Bevolking
Beschrijving
Inclusion Criteria:
- treatment resistant hypertension
- male of female aged over 18 years
- written informed consent
- agreement to attend all study visits as planned in the protocol
Exclusion Criteria:
- chronic kidney disease 3 - 5
- any contradictions for MRI
- claustrophobia
- strabismus
- severe ocular diseases
- history of epilepsia
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
Cohorten en interventies
Groep / Cohort |
Interventie / Behandeling |
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Renal denervation
Renal denervation using Symplicity Catheter system
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percutaneous selective renal sympathetic nerve ablation with the use of the Symplicity Catheter system
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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office BP
Tijdsspanne: baseline, 6 months
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change in office blood pressure from baseline to 6 months post-renal denervation
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baseline, 6 months
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24-ABPM
Tijdsspanne: baseline, 6 months
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change in 24 hour ambulatory blood pressure (ABPM) from baseline to 6 months post-renal denervation
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baseline, 6 months
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Magnetic resonance imaging (MRI)
Tijdsspanne: baseline, 3 and 6 months
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baseline, 3 and 6 months
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Albuminuria
Tijdsspanne: baseline, 6 months
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change in urinary albumin/creatinine ratio from baseline to 6 months post-renal denervation
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baseline, 6 months
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Systemic RAS activity
Tijdsspanne: baseline, 6 months
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baseline, 6 months
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Vascular structure and function of large and small arteries
Tijdsspanne: baseline, 6 months
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baseline, 6 months
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Local RAS activity
Tijdsspanne: baseline, 6 months
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change in urinary angiotensinogen concentration from the morning spot urine from baseline to 6 months post-renal denervation
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baseline, 6 months
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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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BP
Tijdsspanne: 3 and 12 months
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3 and 12 months
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MRI
Tijdsspanne: 1 day and 12 months
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1 day and 12 months
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Local RAS activity
Tijdsspanne: 1 day, 3 and 12 months
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change urinary angiotensinogen concentration from the morning spot urine from baseline to 1 day, 3 and 12 months post-renal denervation
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1 day, 3 and 12 months
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Systemic RAS activity
Tijdsspanne: 1 day, 3 and 12 months
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1 day, 3 and 12 months
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Albuminuria
Tijdsspanne: 3 and 12 months
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- change in albuminuria from baseline to 3 and 12 months post-renal denervation
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3 and 12 months
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Vascular structure and function of large and small arteries
Tijdsspanne: 3 and 12 months
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3 and 12 months
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Medewerkers en onderzoekers
Publicaties en nuttige links
Algemene publicaties
- Schmieder RE, Ott C, Schmid A, Friedrich S, Kistner I, Ditting T, Veelken R, Uder M, Toennes SW. Adherence to Antihypertensive Medication in Treatment-Resistant Hypertension Undergoing Renal Denervation. J Am Heart Assoc. 2016 Feb 12;5(2):e002343. doi: 10.1161/JAHA.115.002343.
- Ott C, Harazny JM, Schmid A, Ditting T, Veelken R, Bladowski M, Michelson G, Uder M, Schmieder RE. Retinal microperfusion after renal denervation in treatment-resistant hypertensive patients. Clin Res Cardiol. 2015 Sep;104(9):782-9. doi: 10.1007/s00392-015-0845-0. Epub 2015 Apr 28.
- Ott C, Mahfoud F, Schmid A, Ewen S, Toennes SW, Meyer MR, Helfer AG, Maurer HH, Ditting T, Veelken R, Zivanovic I, Uder M, Bohm M, Schmieder RE. The effect of renal denervation in moderate treatment-resistant hypertension with confirmed medication adherence. J Hypertens. 2016 Dec;34(12):2475-2479. doi: 10.1097/HJH.0000000000001110.
- Ott C, Mahfoud F, Schmid A, Toennes SW, Ewen S, Ditting T, Veelken R, Ukena C, Uder M, Bohm M, Schmieder RE. Renal denervation preserves renal function in patients with chronic kidney disease and resistant hypertension. J Hypertens. 2015 Jun;33(6):1261-6. doi: 10.1097/HJH.0000000000000556.
- Bosch A, Schmid A, Ott C, Kannenkeril D, Karg MV, Ditting T, Veelken R, Uder M, Schmieder RE. Copeptin Levels in Patients With Treatment-Resistant Hypertension Before and 6 Months After Renal Denervation. Am J Hypertens. 2020 Feb 22;33(2):182-189. doi: 10.1093/ajh/hpz155.
- Ott C, Kopp C, Dahlmann A, Schmid A, Linz P, Cavallaro A, Hammon M, Ditting T, Veelken R, Uder M, Titze J, Schmieder RE. Impact of renal denervation on tissue Na+ content in treatment-resistant hypertension. Clin Res Cardiol. 2018 Jan;107(1):42-48. doi: 10.1007/s00392-017-1156-4. Epub 2017 Aug 28.
- Ott C, Schmid A, Toennes SW, Ditting T, Veelken R, Uder M, Schmieder RE. Central pulse pressure predicts BP reduction after renal denervation in patients with treatment-resistant hypertension. EuroIntervention. 2015 May;11(1):110-6. doi: 10.4244/EIJV11I1A19.
- Ott C, Mahfoud F, Schmid A, Ditting T, Veelken R, Ewen S, Ukena C, Uder M, Bohm M, Schmieder RE. Improvement of albuminuria after renal denervation. Int J Cardiol. 2014 May 1;173(2):311-5. doi: 10.1016/j.ijcard.2014.03.017. Epub 2014 Mar 15.
- Ott C, Mahfoud F, Schmid A, Ditting T, Sobotka PA, Veelken R, Spies A, Ukena C, Laufs U, Uder M, Bohm M, Schmieder RE. Renal denervation in moderate treatment-resistant hypertension. J Am Coll Cardiol. 2013 Nov 12;62(20):1880-6. doi: 10.1016/j.jacc.2013.06.023. Epub 2013 Jul 10.
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