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Renal Denervation in Treatment Resistant Hypertension

17 februari 2020 uppdaterad 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

Studieöversikt

Status

Avslutad

Betingelser

Intervention / Behandling

Studietyp

Observationell

Inskrivning (Faktisk)

41

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

  • 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

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

18 år till 85 år (Vuxen, Äldre vuxen)

Tar emot friska volontärer

Nej

Kön som är behöriga för studier

Allt

Testmetod

Icke-sannolikhetsprov

Studera befolkning

treatment resistant hypertensive adults

Beskrivning

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

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

Kohorter och interventioner

Grupp / Kohort
Intervention / 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

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
office BP
Tidsram: baseline, 6 months
change in office blood pressure from baseline to 6 months post-renal denervation
baseline, 6 months
24-ABPM
Tidsram: 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)
Tidsram: 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
Tidsram: baseline, 6 months
change in urinary albumin/creatinine ratio from baseline to 6 months post-renal denervation
baseline, 6 months
Systemic RAS activity
Tidsram: 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
Tidsram: 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
Tidsram: baseline, 6 months
change in urinary angiotensinogen concentration from the morning spot urine from baseline to 6 months post-renal denervation
baseline, 6 months

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
BP
Tidsram: 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
Tidsram: 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
Tidsram: 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
Tidsram: 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
Tidsram: 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
Tidsram: 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

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

University of Erlangen-Nürnberg Medical School

Publikationer och användbara länkar

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Allmänna publikationer

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

1 november 2010

Primärt slutförande (Faktisk)

1 juni 2018

Avslutad studie (Faktisk)

1 december 2018

Studieregistreringsdatum

Först inskickad

13 september 2012

Först inskickad som uppfyllde QC-kriterierna

18 september 2012

Första postat (Uppskatta)

19 september 2012

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

18 februari 2020

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

17 februari 2020

Senast verifierad

1 februari 2020

Mer information

Termer relaterade till denna studie

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • RD-TRH

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