Anatomical and procedural determinants of catheter-based renal denervation

Sebastian Ewen, Christian Ukena, Thomas Felix Lüscher, Martin Bergmann, Peter J Blankestijn, Erwin Blessing, Bodo Cremers, Oliver Dörr, Dagmara Hering, Lukas Kaiser, Holger Nef, Elias Noory, Markus Schlaich, Faisal Sharif, Isabella Sudano, Britta Vogel, Michiel Voskuil, Thomas Zeller, Abraham R Tzafriri, Elazer R EdelmanLucas Lauder, Bruno Scheller, Michael Böhm, Felix Mahfoud

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

BACKGROUND/PURPOSE: Catheter-based renal sympathetic denervation (RDN) can reduce blood pressure (BP) and sympathetic activity in certain patients with uncontrolled hypertension. Less is known about the impact of renal anatomy and procedural parameters on subsequent BP response.

METHODS/MATERIALS: A total of 564 patients with resistant hypertension underwent bilateral RDN in 9 centers in Europe and Australia using a mono-electrode radiofrequency catheter (Symplicity Flex, Medtronic). Anatomical criteria such as prevalence of accessory renal arteries (ARA), presence of renal artery disease (RAD), length, and diameter were analyzed blinded to patient's characteristics.

RESULTS: ARA was present in 171 patients (30%), and RAD was documented in 71 patients (13%). On average 11±2.7 complete 120-s ablations were performed, equally distributed on both sides. After 6months, BP was reduced by 19/8mmHg (p<0.001 for both). Change of systolic blood pressure (SBP) was not related to the presence of ARA (-18 vs. -20mmHg; p=NS) or RAD (-16 vs. -20mmHg; p=NS). Patients with a bilateral diameter≤4mm had a more pronounced reduction of SBP compared to patients with a unilateral diameter≤4mm or a bilateral diameter>4mm (-29 vs. -26 vs. -17mmHg; p<0.001). Neither the length of the renal artery nor the number of RF ablations influenced BP reduction after 6months.

CONCLUSIONS: The diameter of renal arteries correlated with SBP change after RDN at 6-month follow-up. Change of SBP was not related to the lengths of the renal artery, presence of ARA, RAD, or the number of RF ablations delivered by a mono-electrode catheter.

Original languageEnglish
Pages (from-to)474-479
JournalCardiovascular revascularization medicine : including molecular interventions
Volume17
Issue number7
DOIs
Publication statusPublished - 20 Aug 2016

Keywords

  • Ablation
  • Accessory renal artery
  • Diameter
  • Renal artery stenosis

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