Innervation patterns may limit response to endovascular renal denervation.

Area of Science:

• Interventional Cardiology
• Nephrology
• Vascular Surgery

Background:

• Renal denervation is an emerging treatment for hypertension.
• Current techniques yield inconsistent clinical outcomes.
• The underlying anatomical factors influencing efficacy are not fully understood.

Purpose of the Study:

• To correlate radiofrequency ablation response with renal artery nerve and ganglia distribution.
• To investigate how renal neural network anatomy impacts treatment efficacy.

Main Methods:

• Radiofrequency ablation using a multielectrode catheter was performed on 8 renal arteries.
• Renal norepinephrine levels were measured and correlated with ablation zone geometry and neural injury.
• Nerve and ganglion distribution and size were quantified and compared to 16 control arteries.

Main Results:

• Nerve and ganglion distribution varied significantly with distance from the aorta.
• Effective renal norepinephrine reduction was observed in only one artery with extensive, deep ablation across all quadrants.
• Most treated arteries showed minimal nerve involvement and no significant reduction in norepinephrine levels.

Conclusions:

• Renal denervation efficacy is limited by asymmetric periarterial nerve and ganglia distribution.
• Inadequate targeting of these neural structures can lead to treatment failure.
• Further research is needed to define optimal ablation strategies considering anatomical variations.