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Renal Denervation in Treatment Resistant Hypertension

17. februar 2020 oppdatert av: University of Erlangen-Nürnberg Medical School

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

Studieoversikt

Status

Fullført

Forhold

Intervensjon / Behandling

Studietype

Observasjonsmessig

Registrering (Faktiske)

41

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiesteder

  • Tyskland
      • Erlangen, Tyskland, 91054
        • Clinical Research Unit, Department of Nephrology and Hypertension, University of Erlangen-Nürnberg
      • Homburg/Saar, Tyskland, 66421
        • Klinik für Innere Medizin, Kardiologie, Angiologie und Internistische Intensivmedizin, Universitätsklinikum des Saarlandes

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år til 85 år (Voksen, Eldre voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

Alle

Prøvetakingsmetode

Ikke-sannsynlighetsprøve

Studiepopulasjon

treatment resistant hypertensive adults

Beskrivelse

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

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

Kohorter og intervensjoner

Gruppe / Kohort
Intervensjon / Behandling
Renal denervation
Renal denervation using Symplicity Catheter system
Enhet: Renal denervation using Symplicity Catheter system
percutaneous selective renal sympathetic nerve ablation with the use of the Symplicity Catheter system

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
office BP
Tidsramme: baseline, 6 months
change in office blood pressure from baseline to 6 months post-renal denervation
baseline, 6 months
24-ABPM
Tidsramme: baseline, 6 months
change in 24 hour ambulatory blood pressure (ABPM) from baseline to 6 months post-renal denervation
baseline, 6 months
Magnetic resonance imaging (MRI)
Tidsramme: baseline, 3 and 6 months
  • change in total sodium content measured by MRI from baseline to 6 months post-renal denervation
  • change in renal perfusion measured by MRI from baseline to 3 months post-renal denervation
baseline, 3 and 6 months
Albuminuria
Tidsramme: baseline, 6 months
change in urinary albumin/creatinine ratio from baseline to 6 months post-renal denervation
baseline, 6 months
Systemic RAS activity
Tidsramme: baseline, 6 months
  • change in sodium, potassium and creatinine from baseline to 6 months post-renal denervation
  • change in aldosterone excretion from baseline to 6 months post-renal denervation
  • change in sodium/potassium ratio from baseline to 6 months post-renal denervation
  • change in plasma renin activity and angiotensin II concentration at least 30 minutes of rest in a supine position and immediately after standing from baseline to 6 months post-renal denervation
baseline, 6 months
Vascular structure and function of large and small arteries
Tidsramme: baseline, 6 months
  • change in flow-mediated vasodilation (FMD)from baseline to 6 months post-renal denervation
  • change in scanning laser Doppler flowmetry (SLDF) from baseline to 6 months post-renal denervation
  • change in funduscopy from baseline to 6 months post-renal denervation
  • change in pulse wave analysis (PWA) from baseline to 6 months post-renal denervation
  • change in pulse wave velocity (PWV) from baseline to 6 months post-renal denervation
  • change in urinary albumine/creatinine ratio (UACR) of the morning spot urine sample from baseline to 6 months post-renal denervation
baseline, 6 months
Local RAS activity
Tidsramme: baseline, 6 months
change in urinary angiotensinogen concentration from the morning spot urine from baseline to 6 months post-renal denervation
baseline, 6 months

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
BP
Tidsramme: 3 and 12 months
  • change in office BP from baseline to 3 and 12 months post-renal denervation
  • change in 24 hour ABPM from baseline to 3 and 12 months post-renal denervation
3 and 12 months
MRI
Tidsramme: 1 day and 12 months
  • change in total sodium content measured by MRI from baseline to 12 months post-renal denervation
  • change in renal perfusion measured by MRI spin labelling technique from baseline to 1 day post-renal denervation
1 day and 12 months
Local RAS activity
Tidsramme: 1 day, 3 and 12 months
change urinary angiotensinogen concentration from the morning spot urine from baseline to 1 day, 3 and 12 months post-renal denervation
1 day, 3 and 12 months
Systemic RAS activity
Tidsramme: 1 day, 3 and 12 months
  • change in sodium potassium and creatinine from baseline to 1 day, 3 and 12 months post-renal denervation
  • change in aldosterone excretion from baseline to 1 day, 3 and 12 months post-renal denervation
  • change in sodium/potassium ratio from baseline to 1 day, 3 and 12 months post-renal denervation
  • change in plasma renin activity and angiotensin II concentration at least 30 minutes of rest in a supine position and immediately after standing from baseline to 1 day, 3 and 12 months post-renal denervation
1 day, 3 and 12 months
Albuminuria
Tidsramme: 3 and 12 months
- change in albuminuria from baseline to 3 and 12 months post-renal denervation
3 and 12 months
Vascular structure and function of large and small arteries
Tidsramme: 3 and 12 months
  • change in flow mediated vasodilation (FMD) from baseline to 12 months post-renal denervation
  • change in scanning laser Doppler flowmetry (SLDF) from baseline to 12 months post-renal denervation
  • change in funduscopy from baseline to 3 and 12 months post-renal denervation
  • change in pulse wave analysis (PWA) from baseline to 12 months post-renal denervation
  • change in pulse wave velocity (PWV) from baseline to 12 months post-renal denervation
  • change in urinary albumine/creatinine ratio of the morning spot urine sample from baseline to 3 and 12 months post-renal denervation
3 and 12 months

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

University of Erlangen-Nürnberg Medical School

Publikasjoner og nyttige lenker

Den som er ansvarlig for å legge inn informasjon om studien leverer frivillig disse publikasjonene. Disse kan handle om alt relatert til studiet.

Generelle publikasjoner

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

1. november 2010

Primær fullføring (Faktiske)

1. juni 2018

Studiet fullført (Faktiske)

1. desember 2018

Datoer for studieregistrering

Først innsendt

13. september 2012

Først innsendt som oppfylte QC-kriteriene

18. september 2012

Først lagt ut (Anslag)

19. september 2012

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

18. februar 2020

Siste oppdatering sendt inn som oppfylte QC-kriteriene

17. februar 2020

Sist bekreftet

1. februar 2020

Mer informasjon

Begreper knyttet til denne studien

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • RD-TRH

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