Renal Artery Denervation for Hypertension

Abstract

Purpose of review: Hypertension (HTN) has a growing impact, already affecting over 1 billion people. An estimated 2-16% of those with HTN have resistant HTN. The sympathetic nervous system (SNS) is a recognized contributor to the pathophysiology of resistant HTN. Current hypertensive pharmacotherapy has not fully targeted the SNS; therefore, the SNS has become a prominent research therapeutic target. This review summarizes the evidence and rationale behind renal denervation (RDN) therapy and the technology available.

Recent findings: Prior to the SYMPLICITY HTN-3 clinical trial, trials found RDN to be an effective procedure to control resistant hypertension. The failure of SYMPLICITY HTN-3 to meet its primary efficacy endpoint sparked further studies to address potential shortcomings. The subsequent SPYRAL program trials demonstrated efficacy of RDN therapy in a controlled manner; however, they were not adequately powered. Ongoing research is examining new, innovative RDN technology as well as defining appropriate patients to target for treatment. The data currently available for RDN in HTN and other states of SNS activation suffer from potential biases and limitations, highlighting the need for continued exploration. Contemporary studies are more promising and hypothesis-generating. Future trials and continued device innovation will be crucial for understanding the clinical applications of RDN therapy.

Keywords: Renal denervation; Resistant hypertension; Sympathetic nervous system.