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Bipolar radiofrequency ablation in ex vivo bovine liver with the open-perfused system versus the cooled-wet system

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Authors
Lee, Jeong Min; Han, Joon Koo; Kim, Se Hyung; Sohn, Kyu Li; Choi, Seung Hong; Choi, Byung Ihn
Issue Date
2004-07-10
Publisher
Springer Verlag
Citation
Eur Radiol 15:759–764
Keywords
LiverInterventional proceduresRadiofrequency ablationExperimental study
Abstract
The aim of this study was
to investigate the efficacy of bipolar
radiofrequency ablation (RFA) with
the open-perfused electrode and
cooled-wet electrode. Bipolar RF
was applied for 20 min to the ex
vivo bovine liver using either the
Berchtold system with two 16-gauge
open-perfused electrodes (group A,
n=15) or the Radionics system with
two 15-gauge cooled-wet electrodes
(group B, n=15). In both groups, two
electrodes were placed 3 cm apart.
The ablation zone was created by the
RF energy delivered together with
the infusion of 5% hypertonic saline
(2 ml/min). The dimension of the ablation
zone, its shape and the changes
in the impedance and W s of two
groups during the RFA were examined
and documented. The vertical
diameter (Dv) along the probe, the
long-axis diameter (Dl) perpendicular
to the Dv in the longitudinal
plane and the short-axis diameter of
the ablation zone (Ds) in the transverse
plane through the midpoint
between the tips of two probes
were measured. The mean accumulated
energy output in the Radionics
system was higher than in the Berchtold
system (159,887.0±36,423 W s
vs. 87,555.1±86,787 W s). The difference
was statistically significant
(P<0.05). In group A, the impedance
intermittently rose to above 700 Ω
during the RFA in all sessions, which
led to a gradual decrease of the
power output to lower than 30 W.
In group B, on the other hand, the
impedance did not change markedly.
The mean Dv value of the coagulation
necrosis in group B was
significantly longer than in group A
(5.0±0.4 cm vs. 4.3±0.6 cm,
P<0.05). The mean Dl and Ds were
6.7±0.5 cm and 5.0±0.8 cm in group
A, and 6.5±0.8 cm and 5.5±0.7 cm
in group B, respectively (P>0.05).
The data demonstrate that the
cooled-wet electrode generates the
more spherical ablation zone than
the open-perfused electrode. With
approximately doubled power output,
the bipolar RFA with the cooledwet
electrodes induces a larger volume
of tissue coagulation than with
the open-perfused electrodes.
ISSN
0938-7994 (Print)
1432-1084 (Electronic)
http://dx.doi.org/10.1007/s00330-004-2375-4
Language
English
URI
http://hdl.handle.net/10371/10084
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College of Medicine/School of Medicine (의과대학/대학원)Radiology (영상의학전공)Journal Papers (저널논문_영상의학전공)
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