10 years after treatment with renal denervation of the sympathetic nerves for resistant hypertension: what happened to the patients and their office blood pressure? An observational study

Abstract Background Catheter-based renal denervation of the sympathetic nerves (RDN) for resistant hypertension has long been controversial. A renewed clinical and scientific interest in defining the appropriate role of RDN in the treatment of resistant hypertension has become evident in recent years. The efficacy and safety of RDN treatment is mainly based on available data up to three years, whereas data concerning the long-term effect and safety are scarce. Purpose We therefore wanted to investigate the long time change in blood pressure (BP) in patients treated with RDN for resistant hypertension. Methods A review of data from the electronic patient journal concerning all RDN treated patients was initiated and completed in October 2023. Every registration of an office BP listed in the patient file, antihypertensive treatment, cardiovascular events, and renal function between 2012 and 2023 were registered. For each patient the average of all office post RDN blood were averaged for every year and for their complete follow-up. The outcome in blood pressure was the change in BP from baseline pre RDN office to follow-up Results Between January 2012 and October 2013, 19 consecutive patients underwent RDN treatment, 10 men and 9 women with a median age of 63 years (range 35-74 years). At baseline the median systolic office BP was 181 mmHg (range 162–230 mmHg) and the diastolic office BP 97 mmHg (range 82-123 mmHg) on a median of 5 (range 0-7 ) antihypertensive drugs. During follow-up the number of antihypertensive drugs were reduced in 7, unchanged in 10, and increased in 2 patients. Two patients left the outpatient clinic with normal BP after 2 years. Two patients developed heart failure after 7 years and were censored at that time-point. 15 (79%) patients had office BP recorded up to 9 or 10 years. In the 15 (79%) patients with available office BP 9 to 10 years after RDN the median systolic and diastolic office BPs were reduced by 39 mmHg (range -2 to - 66 mmHg) and 18 mmHg (range -11 to - 55 mmHg) respectively, relative reduction 22% (range 5-36%) and 20% (range 6-32), respectively. Conclusion During a follow-up of 9 to 10 years after RDN without a step-up in antihypertensive medication a relative decrease of ~20% in systolic and diastolic BP was observed.