• Journal of the Korean Arthroscopy Society
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• v.12 no.1
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• pp.66-68
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• 2008

Recently, devices using radiofrequency energy have been developed for arthroscopic soft tissue ablation, cauterization and shrinkage. After ACL reconstruction operation, articular metallic foreign body was found in the post-operative radiographs. It was proven to be the tip of bipolar radiofrequency system after foreign body removal. After that we experienced 2 more cases during the acromioplasty procedure. We requires attention to prevent the separation of the tip from the body in the arthroscopic surgery using bipolar radiofrequency system.

• The Korean Journal of Pain
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• v.18 no.1
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• pp.92-95
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• 2005

Primary hyperhidrosis, a disorder of unknown etiology, is characterized by excessive uncontrollable sweating, most often of the palm surface of the hands, armpits, groin and feet. To decrease the symptoms of hyperhidrosis, drug therapy, iontophoresis, excision of axillary sweat glands and thoracoscopic sympathectomy have been attempted. A lumbar sympathectomy is one of the available choices for the treatment hyperhidrosis of the lower extremities. A 28-year old female patient presented with excessive sweating of her hands and feet. For the treatment of her foot hyperhidrosis, a bipolar radiofrequency ablation system was used to ablate the lumbar sympathetic ganglion, with a successful result. This modality will receive greater attention as an available alternative to lumbar sympathetic neurolysis.

• The Korean Journal of Physiology and Pharmacology
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• v.20 no.5
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• pp.507-514
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• 2016

Although 3D-complex fractionated atrial electrogram (CFAE) mapping is useful in radiofrequency catheter ablation for persistent atrial fibrillation (AF), the directions and configuration of the bipolar electrodes may affect the electrogram. This study aimed to compare the spatial reproducibility of CFAE by changing the catheter orientations and electrode distance in an in -silico left atrium (LA). We conducted this study by importing the heart CT image of a patient with AF into a 3D-homogeneous human LA model. Electrogram morphology, CFAE-cycle lengths (CLs) were compared for 16 different orientations of a virtual bipolar conventional catheter (conv-cath: size 3.5 mm, inter-electrode distance 4.75 mm). Additionally, the spatial correlations of CFAE-CLs and the percentage of consistent sites with CFAE-CL<120 ms were analyzed. The results from the conv-cath were compared with that obtained using a mini catheter (mini-cath: size 1 mm, inter-electrode distance 2.5 mm). Depending on the catheter orientation, the electrogram morphology and CFAE-CLs varied (conv-cath: $11.5{\pm}0.7%$ variation, mini-cath: $7.1{\pm}1.2%$ variation), however the mini-cath produced less variation of CFAE-CL than conv-cath (p<0.001). There were moderate spatial correlations among CFAE-CL measured at 16 orientations (conv-cath: $r=0.3055{\pm}0.2194$ vs. mini-cath: $0.6074{\pm}0.0733$, p<0.001). Additionally, the ratio of consistent CFAE sites was higher for mini catheter than conventional one ($38.3{\pm}4.6%$ vs. $22.3{\pm}1.4%$, p<0.05). Electrograms and CFAE distribution are affected by catheter orientation and electrode configuration in the in-silico LA model. However, there was moderate spatial consistency of CFAE areas, and narrowly spaced bipolar catheters were less influenced by catheter direction than conventional catheters.