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Title: Ex Vivo Experiment of Saline-Enhanced Hepatic Bipolar Radiofrequency Ablation with a Perfused Needle Electrode: Comparison with Conventional Monopolar and Simultaneous Monopolar Modes

Abstract

The purpose of this study was to validate the saline-enhanced bipolar radiofrequency ablation (RFA) technique using a perfused electrode to increase RF-created coagulation necrosis, to compare that technique with monopolar RFAs and to find appropriate concentrations and volumes of perfused NaCl solution for the bipolar RFA. A total of 90 ablations were performed in explanted bovine livers. In the initial experiments to determine appropriate conditions for bipolar RFA, we created five thermal ablation zones in each condition, with instillations of varied concentrations (0.9-36%) or injection rates (30 mL/hr-120 mL/hr) of NaCl solution. After placement of one or two 16-gauge open-perfused electrodes into bovine livers, the NaCl solution was instilled into the tissue through the electrode. In the second part of the study, 10 ablation zones were created using one or two perfused electrodes for each of five groups under different conditions: a conventional monopolar mode with 0.9% NaCl solution (group A) or with 6% NaCl solution (group B), a simultaneous monopolar mode with 6% NaCl solution (group C) and a bipolar mode with 6% NaCl solution (groups D and E). RF was applied to each electrode for 20 min in groups A, B, C, and E, or for 10 minmore » in group D. During RFA, we measured the tissue temperature 15 mm from the electrode. The temperature changes during the RFA and the dimensions of the ablation zones were compared among the groups. Bipolar RFA created larger short-axis diameters of coagulation necrosis with 6% NaCl solution (35.8 {+-} 15 mm) than with 0.9% NaCl solution (17 {+-} 9.7 mm) (P < 0.05). However, concentrations of NaCl solution above 6% did not further increase the extent of coagulation necrosis. In addition, bipolar RFA with 6% NaCl solution instillation at a rate of 1.0 mL/min (37.9 {+-} 5.4 mm) or 2.0 mL/min (35.6 {+-} 9.3 mm) produced larger diameters at the mid-point between the electrodes of the ablated lesion than did 0.5 mL/min (25.8 {+-} 9.3 mm) (P < 0.05). The bipolar mode showed a more rapid increase in temperature at the mid-point between the two probes, up to 60 deg. C, than did the monopolar modes (P < 0.05). In addition, the bipolar RFA (group E) treated for 20 min showed a larger value of the short-axis diameter than did the conventional or simultaneous monopolar modes (P < 0.05), and bipolar RFA (group D) treated for 10 min, showed similar results with conventional monopolar modes treated for 20 min (P > 0.05): 31.0 {+-} 5.4 mm (group A); 28.8 {+-} 3.8 mm (group B); 25.5 {+-} 6.4 mm (group C); 32.6 {+-} 4.2 mm (group D); 49.4 {+-} 5.0 mm (group E). Bipolar RFA with instillation of 6% NaCl solution through an open perfusion system demonstrates better efficacy in creating a larger ablation zone than does conventional or simultaneous monopolar modes at the various times examined. Therefore, hypertonic saline-enhanced bipolar RFA seems to be a promising approach for treating larger liver tumors.« less

Authors:
; ; ;  [1]
  1. Seoul National University College of Medicine, Department of Radiology (Korea, Republic of)
Publication Date:
OSTI Identifier:
21088123
Resource Type:
Journal Article
Journal Name:
Cardiovascular and Interventional Radiology
Additional Journal Information:
Journal Volume: 28; Journal Issue: 3; Other Information: DOI: 10.1007/s00270-004-0177-3; Copyright (c) 2005 Springer Science+Business Media, Inc.; Article Copyright (c) 2005 Springer-Verlag New York, LLC.; www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0174-1551
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; ABLATION; CATTLE; ELECTRODES; LIVER; NECROSIS; NEOPLASMS; RADIOWAVE RADIATION; SODIUM CHLORIDES

Citation Formats

Lee, Jeong Min, E-mail: LEEJM@RADCOM.SNU.AC.KR, Kim, Se Hyung, Han, Joon Koo, Sohn, Kyu Li, and Choi, Byung Ihn. Ex Vivo Experiment of Saline-Enhanced Hepatic Bipolar Radiofrequency Ablation with a Perfused Needle Electrode: Comparison with Conventional Monopolar and Simultaneous Monopolar Modes. United States: N. p., 2005. Web. doi:10.1007/S00270-004-0177-3.
Lee, Jeong Min, E-mail: LEEJM@RADCOM.SNU.AC.KR, Kim, Se Hyung, Han, Joon Koo, Sohn, Kyu Li, & Choi, Byung Ihn. Ex Vivo Experiment of Saline-Enhanced Hepatic Bipolar Radiofrequency Ablation with a Perfused Needle Electrode: Comparison with Conventional Monopolar and Simultaneous Monopolar Modes. United States. https://doi.org/10.1007/S00270-004-0177-3
Lee, Jeong Min, E-mail: LEEJM@RADCOM.SNU.AC.KR, Kim, Se Hyung, Han, Joon Koo, Sohn, Kyu Li, and Choi, Byung Ihn. 2005. "Ex Vivo Experiment of Saline-Enhanced Hepatic Bipolar Radiofrequency Ablation with a Perfused Needle Electrode: Comparison with Conventional Monopolar and Simultaneous Monopolar Modes". United States. https://doi.org/10.1007/S00270-004-0177-3.
@article{osti_21088123,
title = {Ex Vivo Experiment of Saline-Enhanced Hepatic Bipolar Radiofrequency Ablation with a Perfused Needle Electrode: Comparison with Conventional Monopolar and Simultaneous Monopolar Modes},
author = {Lee, Jeong Min, E-mail: LEEJM@RADCOM.SNU.AC.KR and Kim, Se Hyung and Han, Joon Koo and Sohn, Kyu Li and Choi, Byung Ihn},
abstractNote = {The purpose of this study was to validate the saline-enhanced bipolar radiofrequency ablation (RFA) technique using a perfused electrode to increase RF-created coagulation necrosis, to compare that technique with monopolar RFAs and to find appropriate concentrations and volumes of perfused NaCl solution for the bipolar RFA. A total of 90 ablations were performed in explanted bovine livers. In the initial experiments to determine appropriate conditions for bipolar RFA, we created five thermal ablation zones in each condition, with instillations of varied concentrations (0.9-36%) or injection rates (30 mL/hr-120 mL/hr) of NaCl solution. After placement of one or two 16-gauge open-perfused electrodes into bovine livers, the NaCl solution was instilled into the tissue through the electrode. In the second part of the study, 10 ablation zones were created using one or two perfused electrodes for each of five groups under different conditions: a conventional monopolar mode with 0.9% NaCl solution (group A) or with 6% NaCl solution (group B), a simultaneous monopolar mode with 6% NaCl solution (group C) and a bipolar mode with 6% NaCl solution (groups D and E). RF was applied to each electrode for 20 min in groups A, B, C, and E, or for 10 min in group D. During RFA, we measured the tissue temperature 15 mm from the electrode. The temperature changes during the RFA and the dimensions of the ablation zones were compared among the groups. Bipolar RFA created larger short-axis diameters of coagulation necrosis with 6% NaCl solution (35.8 {+-} 15 mm) than with 0.9% NaCl solution (17 {+-} 9.7 mm) (P < 0.05). However, concentrations of NaCl solution above 6% did not further increase the extent of coagulation necrosis. In addition, bipolar RFA with 6% NaCl solution instillation at a rate of 1.0 mL/min (37.9 {+-} 5.4 mm) or 2.0 mL/min (35.6 {+-} 9.3 mm) produced larger diameters at the mid-point between the electrodes of the ablated lesion than did 0.5 mL/min (25.8 {+-} 9.3 mm) (P < 0.05). The bipolar mode showed a more rapid increase in temperature at the mid-point between the two probes, up to 60 deg. C, than did the monopolar modes (P < 0.05). In addition, the bipolar RFA (group E) treated for 20 min showed a larger value of the short-axis diameter than did the conventional or simultaneous monopolar modes (P < 0.05), and bipolar RFA (group D) treated for 10 min, showed similar results with conventional monopolar modes treated for 20 min (P > 0.05): 31.0 {+-} 5.4 mm (group A); 28.8 {+-} 3.8 mm (group B); 25.5 {+-} 6.4 mm (group C); 32.6 {+-} 4.2 mm (group D); 49.4 {+-} 5.0 mm (group E). Bipolar RFA with instillation of 6% NaCl solution through an open perfusion system demonstrates better efficacy in creating a larger ablation zone than does conventional or simultaneous monopolar modes at the various times examined. Therefore, hypertonic saline-enhanced bipolar RFA seems to be a promising approach for treating larger liver tumors.},
doi = {10.1007/S00270-004-0177-3},
url = {https://www.osti.gov/biblio/21088123}, journal = {Cardiovascular and Interventional Radiology},
issn = {0174-1551},
number = 3,
volume = 28,
place = {United States},
year = {Fri Apr 15 00:00:00 EDT 2005},
month = {Fri Apr 15 00:00:00 EDT 2005}
}