NDLI: Multiple-electrode radiofrequency ablations using Octopus® electrodes in an in vivo porcine liver model.

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Multiple-electrode radiofrequency ablations using Octopus® electrodes in an in vivo porcine liver model.

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Multiple-electrode radiofrequency ablations using Octopus® electrodes in an in vivo porcine liver model.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lee, E. S. Lee, J. M. Kim, W. S. Choi, S. H. Joo, I. Kim, M. Yoo, D. H. Yoo, R-E Han, J. K. Choi, B. I.
Description	Author Affiliation: Lee ES ( Department of Radiology, Seoul NationalUniversity College of Medicine, Seoul, Republic of Korea.)
Abstract	OBJECTIVES: The objective of this study was to determine the in vivo efficacy of radiofrequency ablation (RFA) in porcine liver using Octopus® electrodes for creating a large coagulation compared with RFA using clustered electrodes. METHODS: A total of 39 coagulations were created using a 200-W generator and clustered electrodes or Octopus electrodes during laparotomy in 19 pigs. Radiofrequency was applied to the livers using four protocols: (1) Group A-1, monopolar mode using a clustered electrode (n=11); (2) Group A-2, monopolar mode using an Octopus electrode (n=11); (3) Group B-1, consecutive monopolar mode using three, clustered electrodes (n=8); and (4) Group B-2, switching monopolar mode using two Octopus electrodes (n=9). The energy efficiency, shape, diameters (D) and volume (V) of the coagulation volume were compared in each of the two groups. RESULTS: The mean maximum D and V of the coagulations in Group A-2 (4.7 cm and 33.1 cm(3), respectively) were significantly larger than those in Group A-1 (4.1 cm and 20.3 cm(3), respectively) (p<0.05). Furthermore, the mean minimum D, maximum D and V of the coagulations in Group B-2 were significantly larger than those in Group B-1, i.e. 5.3 vs 4.0 cm, 6.6 vs 4.9 cm and 66.9 vs 30.2 cm(3), respectively (p<0.05). The energy efficiencies were also significantly higher in Groups A-2 and B-2 than in Groups A-1 and B-1 (p<0.05). CONCLUSION: The Octopus electrodes were more efficient for creating a large ablation zone than clustered electrodes, and the efficacy of RFA with Octopus electrodes can be amplified in the switching monopolar mode.
File Format	HTM / HTML
ISSN	00071277
DOI	10.1259/bjr/61619687
Journal	The British Journal of Radiology
Issue Number	1017
Volume Number	85
Language	English
Publisher	BIR Publications
Publisher Date	2012-09-01
Publisher Place	Great Britain (UK)
Access Restriction	Open
Subject Keyword	Liver Catheter Ablation Instrumentation Equipment Design Hepatectomy Electrodes Pathology Animals Swine Surgery Equipment Failure Analysis Discipline Radiology
Content Type	Text
Resource Type	Article

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