Surgery involving ultrasound energy found to treat high blood pressure
An operation that targets the nerves connected to the kidney has been found to significantly reduce blood pressure in patients with hypertension, according to the results of a clinical trial led in the UK by Queen Mary University of London and Barts Health NHS Trust, and supported by the National Institute for Health Research (NIHR).
If the findings are confirmed in more extensive clinical trials, the surgery could offer hope to patients with high blood pressure who do not respond to drugs, and are at increased risk of cardiovascular diseases, including stroke and heart attack.
The international clinical trial, carried out from 2017 to 2018 at St Bartholomew’s Hospital in the UK by the NIHR Barts Biomedical Research Centre, tested a one-hour operation called ‘renal denervation’, which uses ultrasound energy to disrupt the nerves between the kidneys and the brain that carry signals for controlling blood pressure.
Significant reduction in blood pressure
146 patients in the United States, France, Germany, the Netherlands, Belgium and the United Kingdom were randomised to receive either renal denervation or a ‘sham procedure’ - the surgical equivalent of a placebo. Patients also remained off blood pressure medications for two months unless specified blood pressure levels were exceeded.
After two months, the renal denervation group experienced an 8.5 mm Hg reduction in blood pressure, which was a 6.3 mm Hg greater reduction compared with the sham group.
More than 66 per cent of subjects treated with renal denervation demonstrated a 5 mm Hg or greater reduction in blood pressure, compared with 33 per cent in the sham group.
No major adverse events were reported in either group, and the blood pressure lowering effect of renal denervation was consistent across sex and ethnicity.
An alternative to lifelong medications
UK Principal Investigator Dr Melvin Lobo from Queen Mary's William Harvey Research Institute and Barts Health NHS Trust said: “These results leave us clinicians in no doubt that this ultrasound-based therapy works to improve blood pressure control - at least in the short term. Further larger trials will be needed to confirm the efficacy and safety of the technology, but we hope that they could lead to renal denervation therapy being offered as an alternative to lifelong medications for hypertension.”
The study has limitations including the short follow-up time of two months. This was done for safety reasons to minimise the duration of patients being off antihypertensive medications. Longer follow-up of this trial and additional numbers of treated patients will be necessary to provide greater assurance of safety and to exclude rare adverse events.
The study was funded by ReCor Medical, Inc. which manufactures the Paradise® Renal Denervation System used in the study.
- Find out more about our clinical research postgraduate courses at the William Harvey Research Institute.
- Research paper: ‘Endovascular Ultrasound Renal Denervation to Treat Hypertension: The RADIANCE-HTN SOLO Randomised Trial’. Prof. Michel Azizi, MD, PhD; Prof. Roland E. Schmieder, MD; Prof. Felix Mahfoud, MD; Prof. Michael A. Weber, MD; Joost Daemen, MD, PhD; Justin Davies, MBBS, MRCP, PhD; Jan Basile, MD; Ajay J. Kirtane, MD, SM; Yale Wang, MD; Melvin D. Lobo, PhD, FRCP; Manish Saxena, MBBS, MSc; Lida Feyz, MD; Florian Rader, MD, MSc; Philipp Lurz, MD; Jeremy Sayer, MD, FRCP; Prof. Marc Sapoval, MD; Terry Levy, MB ChB, FRCP; Kintur Sanghvi, MD; Josephine Abraham, MD, MPH; Andrew SP Sharp, MD; Naomi DL Fisher, MD; Michael J. Bloch, MD; Helen Reeve-Stoffer, PhD; Leslie Coleman, DVM, MS, DACLAM; Christopher Mullin, MS; and Prof. Laura Mauri, MD, MSc on behalf of the RADIANCE-HTN Investigators. The Lancet.
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