Renal Sympathetic Denervation by Ct-Scan-Guided Periarterial Ethanol Injection in Sheep Publisher Pubmed



Firouznia K^{1, 2} ; Hosseininasab S^{1, 2} ; Amanpour S³ ; Hajmirzaian A² ; Miri R^{4, 9} ; Muhammadnejad A⁵ ; Muhammadnejad S⁶ ; Jalali AH^{1, 2} ; Ahmadi F⁷ ; Rokniyazdi H^{1, 2} Show Affiliations
Source: CardioVascular and Interventional Radiology Published:2015

Abstract

Background: Renal nerves are a recent target in the treatment of hypertension. Renal sympathetic denervation (RSD) is currently performed using catheter-based radiofrequency ablation (RFA) and because this method has limitations, percutaneous magnetic resonance (MR)-guided periarterial ethanol injection is a suggested alternative. However, few studies have been conducted on the effectiveness of percutaneous ethanol injection for RSD. Aim: To evaluate the feasibility, efficacy, and complications of computed tomography (CT)-guided periarterial ethanol injection. Methods: Ethanol (10 ml, 99.6 %) was injected around the right renal artery in six sheep under CT guidance with the left kidney serving as a control. Before and after the intervention, the sheep underwent MR imaging studies and the serum creatinine level was measured. One month after the intervention, the sheep were euthanized and norepinephrine (NE) concentration in the renal parenchyma was measured to evaluate the efficacy of the procedure. The treated tissues were also examined histopathologically to evaluate vascular, parenchymal, and neural injury. Results: The right kidney parenchymal NE concentration decreased significantly compared with the left kidney after intervention (average reduction: 40 %, P = 0.0016). Histologic examination revealed apparent denervation with no other vascular or parenchymal injuries observed in the histological and imaging studies. Conclusion: Effective and feasible RSD was achieved using CT-guided periarterial ethanol injection. This technique may be a potential alternative to catheter-based RFA in the treatment of hypertension. © 2015, Springer Science+Business Media New York and the Cardiovascular and Interventional Radiological Society of Europe (CIRSE).