DOI: 10.1186/s13550-018-0360-1Pages: 1-11

Renal sympathetic nerve activity after catheter-based renal denervation

1. Academic Medical Center at the University of Amsterdam, Department of Internal Medicine - Nephrology and Kidney Transplantation

2. Academic Medical Center at the University of Amsterdam, Department of Internal Medicine - Vascular Medicine

3. Academic Medical Center at the University of Amsterdam, Department of Cardiology

4. F2-238 Academic Medical Center, University of Amsterdam, Department of Radiology and Nuclear Medicine

Correspondence to:
Hein J. Verberne
Tel: +31-20-5669111
Email: h.j.verberne@amc.uva.nl

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Abstract

Background

Catheter-based renal sympathetic denervation (RDN) has been considered a potential treatment for therapy resistant hypertension (RHT). However, in a randomized placebo-controlled trial, RDN did not lead to a substantial blood pressure (BP) reduction. We hypothesized that variation in the reported RDN efficacy might be explained by incomplete nerve disruption as assessed by renal 123I–meta-iodobenzylguanidine (123I–mIBG) scintigraphy.

Methods

In 21 RHT patients (median age 60 years), we performed 123I–mIBG scintigraphy before and 6 weeks after RDN. Additionally, we assessed changes in BP (24 h day, night, and average), plasma- and urinary-catecholamines and plasma renin activity (PRA) before and after RDN. Planar scintigraphy was performed at 15 min and 4 h after 123I–mIBG administration. The ratio of the mean renal (specific) counts vs. muscle (non-specific) counts represented 123I–mIBG uptake. Renal 123I–mIBG washout was calculated between 15 min and 4 h.

Results

After RDN office-based systolic BP decreased from 172 to 153 mmHg (p = 0.036), while diastolic office BP (p = 0.531), mean 24 h systolic and diastolic BP (p = 0.602, p = 0.369, respectively), PRA (p = 0.409) and plasma catecholamines (p = 0.324) did not significantly change post-RDN. Following RDN, 123I–mIBG renal uptake at 15 min was 3.47 (IQR 2.26–5.53) compared to 3.08 (IQR 2.79–4.95) before RDN (p = 0.289). Renal 123I–mIBG washout did not change post-RDN (p = 0.230). In addition, there was no significant correlation between the number of denervations and the renal 123I–mIBG parameters.

Conclusions

No changes were observed in renal 123I–mIBG uptake or washout at 6 weeks post-RDN. These observations support incomplete renal denervation as a possible explanation for the lack of RDN efficacy.

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  • Accepted: Jan 10, 2018
  • Online: Jan 26, 2018

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