Renal Nerve Ablation in Chronic Kidney Disease Patients
Understanding the Mechanisms of Progressive Decrease in Blood Pressure After Renal Nerve Ablation
In patients with treatment resistent 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 labelling 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
Studieoversikt
Status
Status
Forhold
Forhold
Intervensjon / Behandling
Intervensjon / Behandling
Detaljert beskrivelse
Studietype
Studietype
Registrering (Faktiske)
Registrering
Kontakter og plasseringer
Studiesteder
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Erlangen, Tyskland, 91054
- Clinical Research Unit, Department of Nephrology and Hypertension, University of Erlangen-Nürnberg
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Lübeck, Tyskland
- Joachim Weil
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Deltakelseskriterier
Kvalifikasjonskriterier
Kvalifikasjonskriterier
Alder som er kvalifisert for studier
Tar imot friske frivillige
Kjønn som er kvalifisert for studier
Prøvetakingsmetode
Studiepopulasjon
Beskrivelse
Inclusion Criteria:
- treatment resistant hypertension
- chronic kidney disease 3 - 5
- male of female aged over 18 years
- written informed consent
- agreement to attend all study visits as planned in the protocol
Exclusion Criteria:
- any contraindications for MRI
- claustrophobia
- strabismus
- severe ocular diseases
- history of epilepsia
Studieplan
Hvordan er studiet utformet?
Designdetaljer
Antall grupper / kohorter
Kohorter og intervensjoner
Gruppe / KohortGruppe / Kohort |
Intervensjon / BehandlingIntervensjon / Behandling |
|---|---|
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treatment resistant hypertensives with CKD 3-5
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percutaneous selective renal sympathetic nerve ablation with the use of the Simplicity Catheter system
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Hva måler studien?
Primære resultatmål
Primære resultatmål
Resultatmål |
Tiltaksbeskrivelse |
Tidsramme |
|---|---|---|
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office BP
Tidsramme: baseline, 6 months
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Change in office blood pressure from baseline to 6 months post-renal nerve ablation
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baseline, 6 months
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24-h ABPM
Tidsramme: baseline, 6 months
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Change in 24 hour ambulatory blood pressure (ABPM) from baseline to 6 months post-renal nerve ablation
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baseline, 6 months
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Magnetic resonance imaging (MRI)
Tidsramme: baseline, 6 months
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baseline, 6 months
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Albuminuria
Tidsramme: baseline, 6 months
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Change in urinary albumin/creatinine ratio from baseline to 6 months post renal nerve ablation (spot urine)
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baseline, 6 months
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local RAS activity
Tidsramme: baseline, 6 months
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Change in urinary angiotensinogen concentration from the morning spot urine from baseline to 6 months post-renal nerve ablation
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baseline, 6 months
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systemic RAS activity
Tidsramme: baseline, 6 months
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baseline, 6 months
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vascular structure and function of large and small arteries
Tidsramme: baseline, 6 months
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baseline, 6 months
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Sekundære resultatmål
Sekundære resultatmål
Resultatmål |
Tiltaksbeskrivelse |
Tidsramme |
|---|---|---|
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BP
Tidsramme: 1 and 12 months
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1 and 12 months
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local RAS activity
Tidsramme: 1 day and 1 months
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Change in urinary angiotensinogen concentration from the morning spot urine from baseline to 1 day and 1 months post-renal nerve ablation
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1 day and 1 months
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systemic RAS activity
Tidsramme: 1 day and 1 months
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1 day and 1 months
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vascular structure and function of large and small arteries
Tidsramme: 12 months
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12 months
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MRI
Tidsramme: 1 day, 1 and 12 months
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1 day, 1 and 12 months
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Samarbeidspartnere og etterforskere
Sponsor
Sponsor
Etterforskere
Etterforskere
- Hovedetterforsker: Roland E Schmieder, MD, University of Erlangen-Nürnberg, Germany
Publikasjoner og nyttige lenker
Generelle publikasjoner
- 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.
- Schmid A, Schmieder R, Lell M, Janka R, Veelken R, Schmieder RE, Uder M, Ott C. Mid-Term Vascular Safety of Renal Denervation Assessed by Follow-up MR Imaging. Cardiovasc Intervent Radiol. 2016 Mar;39(3):426-32. doi: 10.1007/s00270-015-1192-2. Epub 2015 Aug 8.
- 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.
Studierekorddatoer
Studer hoveddatoer
Studiestart (Faktiske)
Studiestart
Primær fullføring (Faktiske)
Primær fullføring
Studiet fullført (Faktiske)
Studiet fullført
Datoer for studieregistrering
Først innsendt
Først innsendt
Først innsendt som oppfylte QC-kriteriene
Først innsendt som oppfylte QC-kriteriene
Først lagt ut (Anslag)
Først lagt ut
Oppdateringer av studieposter
Sist oppdatering lagt ut (Faktiske)
Sist oppdatering lagt ut
Siste oppdatering sendt inn som oppfylte QC-kriteriene
Siste oppdatering sendt inn som oppfylte QC-kriteriene
Sist bekreftet
Sist bekreftet
Mer informasjon
Begreper knyttet til denne studien
Nøkkelord
Ytterligere relevante MeSH-vilkår
Andre studie-ID-numre
Andre studie-ID-numre
- RNA-CKD3-5
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