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Takeshi Okamoto,Takashi Sasaki,Tsuyoshi Takeda,Tatsuki Hirai,Takahiro Ishitsuka,Manabu Yamada,Hiroki Nakagawa,Takafumi Mie,Takaaki Furukawa,Akiyoshi Kasuga,Masato Ozaka,Naoki Sasahira 대한소화기내시경학회 2024 Clinical Endoscopy Vol.57 No.4
Background/Aims: The optimal length of the uncovered portion of partially covered self-expandable metal stents (PCSEMSs) used in endoscopic ultrasound-guided hepaticogastrostomy (EUS-HGS) remains unclear. This study investigated the safety and efficacy of PCSEMSs with different uncovered lengths, with a focus on stent migration and time to recurrent biliary obstruction (RBO). Methods: Outcomes of patients undergoing EUS-HGS using PCSEMSs with 5-mm and 20-mm uncovered portions at our institution from January 2016 to December 2021 were compared. Results: Sixty-two patients underwent EUS-HGS using PCSEMS (5/20-mm uncovered portions: 32/30). Stent migration occurred only in the 5-mm group. There were no differences in RBO rates (28.1% vs. 40.0%) or median time to RBO (6.8 vs. 7.1 months) between the two groups. Median overall survival (OS) was longer in the 20-mm group (3.1 vs. 4.9 months, p=0.037) due to the higher number of patients that resumed chemotherapy after EUS-HGS (56.7% vs. 28.1%, p=0.029). Good performance status, absence of hepatic metastases, and chemotherapy after EUS-HGS were independent predictors of longer OS. Conclusions: No migration was observed in patients treated with PCSEMS with 20-mm uncovered portions. Patients treated with PCSEMS with 20-mm uncovered portions performed at least as well as those treated with 5-mm uncovered portions in all material respects.
A Study on the Partial Discharge Patterns from Multi-Defect Insulating Systems
June-Ho Lee,Tatsuki Okamoto 한국정보과학회 1998 Journal of Electrical Engineering and Information Vol.3 No.2
In practice, there may be various defects in an insulating system, so that the PD signals can be produced from these defects simultaneously. Regarding these situations, we have to discriminate the type of defect as well as to determine whether the PD occurs or not. In this paper, some analysis results of the PD signals from multi-defects insulating system were presented. We measure the PD signals by using three kind of electrode system; IEC(b), Needle-Plane and mixed electrodes. To simulate multi-defect systems, we combined two electrode systems and apply test voltage simultaneously. Neural network statistical analysis methods were tried, and the possibilities and limitations of each method were clarified.