Selective vs. Global Renal Denervation: a Case for Less Is More

Area of Science:

• Nephrology
• Cardiovascular Physiology
• Interventional Cardiology

Background:

• Renal denervation (RDN) aims to reduce sympathetic nervous system activity by ablating renal nerves.
• Mixed results from recent RDN trials highlight limitations of non-targeted approaches.
• Understanding renal nerve anatomy and physiology is crucial for optimizing RDN therapy.

Purpose of the Study:

• To review the fundamentals of renal nerve anatomy and physiology.
• To explore the concepts of global versus selective RDN.
• To uncover limitations of non-targeted ablation and the potential benefits of selective RDN.

Main Methods:

• Review of existing literature on renal nerve anatomy, physiology, and RDN trials.
• Analysis of heterogeneous responses to global RDN.
• Exploration of renal nerve stimulation techniques to identify specific fiber populations.

Main Results:

• Global RDN shows heterogeneous responses, including lack of efficacy or even adverse blood pressure elevations.
• Renal nerve populations are heterogeneous, with distinct sympatho-stimulatory and sympatho-inhibitory fibers.
• Renal nerve stimulation can identify "hot spots" of sympathetic activity.

Conclusions:

• Selective RDN, guided by nerve stimulation, holds promise for improved therapeutic outcomes.
• Avoiding non-target fibers during RDN may mitigate adverse effects and enhance efficacy.
• Further research into selective RDN techniques is warranted to optimize blood pressure management.