Renal peri-adventitial sympathetic nerves and adjacent perivascular tissue (RSN)

The renal peri-adventitial sympathetic nerves and adjacent perivascular tissue represent a key anatomical complex involved in the regulation of systemic blood pressure and renal function [1]. This target consists of a network of efferent and afferent nerve fibers located primarily within the adventitia of the renal arteries and the surrounding adipose tissue [2]. Efferent sympathetic activity at this site stimulates renin release, increases sodium reabsorption, and reduces renal blood flow, all of which contribute to hypertension [3]. Afferent fibers transmit signals from the kidney to the brain, driving a global increase in sympathetic tone that affects the heart and peripheral vasculature [4]. Pathological overactivation of these nerves is a hallmark of resistant hypertension, heart failure, and chronic kidney disease [5]. While systemic drugs like beta-blockers modulate sympathetic output, this specific tissue is the direct target of renal denervation (RDN) therapies [6]. RDN procedures employ radiofrequency, ultrasound, or chemical agents (such as ethanol) to ablate these nerves and disrupt the sympathetic feedback loop [7]. Clinical trials have demonstrated that targeting this tissue can significantly reduce blood pressure in patients who are non-responsive to conventional pharmacotherapy [8]. Safety concerns include potential damage to the renal artery wall, such as stenosis or dissection, during the ablation process [9]. Understanding the precise distribution of these nerves within the perivascular space is essential for optimizing the efficacy of neuromodulation devices [10].

Other names

Renal sympathetic nervesRenal plexusPerivascular renal nervesRenal peri-arterial sympathetic nerves

Thermal or chemical ablation of sympathetic nerve fibers to reduce systemic sympathetic activity and lower blood pressure [6, 7].