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March / April 2013, Volume 19, Issue 2, Page(s) 145-149
Diluted hydrochloric acid generates larger radiofrequency ablation lesions in excised porcine livers
Rong-Guang Luo1, Fei Fao2, Jin-Hua Huang2, Yang-Kui Gu2, Xiong-Ying Jiang2, Ying-Jie Huang2
1Department of Medical Imaging and Interventional Radiology, The First Affiliated Hospital of NanChang University, NanChang, China
2Department of Medical Imaging and Interventional Radiology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, GuangZhou, China
DOI: 10.4261/1305-3825.DIR.6093-12.1
PURPOSE
This study evaluated the influence of continuous infusion of diluted hydrochloric acid during radiofrequency ablation (RFA) on the size of ablated lesions.

MATERIALS AND METHODS

Experiments were performed in 20 excised porcine livers using three different treatment modalities: (1) normal saline-enhanced RFA (NS-RFA), which was normal saline pumped into ablated tissue during RFA; (2) diluted hydrochloric acid ablation (DHAA), which was 3 mol/L diluted hydrochloric acid (HCl) injected into hepatic tissue without RFA; and (3) HCl-enhanced RFA (HCl-RFA), which was 3 mol/L diluted HCl continuously infused into ablated tissue during RFA. We produced 20 HCl-RFA and NS-RFA lesions, respectively, using a monopolar perfusion electrode connected to a commercially available radiofrequency generator, and 20 DHAA lesions using an 18-gauge Chiba needle. The ablated lesions were evaluated both macroscopically and histologically. Dimensions of lesions were compared among HCl-RFA, NS-RFA, and DHAA.

RESULTS
The ablated lesions had an elliptical-like shape and were well-demarcated with normal liver tissue. The mean volume, longitudinal diameter, and transverse diameter of NS-RFA lesions were 11.24±0.29 cm3, 3.49±0.07 cm, and 2.48±0.03 cm, those of HCl-RFA lesions were 58.14±3.05 cm3, 5.51±0.05 cm, and 4.49±0.11 cm, and those of DHAA lesions were 4.41±0.16 cm3, 2.43±0.08 cm, and 1.8±0.03 cm, respectively. The mean dimensions of HCl-RFA lesions were the largest among the three types of ablation (P < 0.001).

CONCLUSION
Under the present experimental conditions, the continuous infusion of diluted HCl during RFA can generate larger ablated lesions than NS-RFA or DHAA in excised porcine livers.