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Management of Remnant or Recurrent Lesions after Endoscopic Papillectomy
Ichiro Yasuda,Saito Kobayashi,Kosuke Takahashi,Sohachi Nanjo,Hiroshi Mihara,Shinya Kajiura,Takayuki Ando,Kazuto Tajiri,Haruka Fujinami 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.6
Endoscopic papillectomy (EP) for ampullary adenomas achieves cure rates ranging from 76% to 90%, and recurrence rates are as high as 33%. If remnant or recurrent lesions after prior EP are endoscopically visible and are not suspected of intraductal extension into the biliary or pancreatic duct, repeated snaring and cutting can be performed until all visible lesions are completely resected. However, endoscopic ablative therapies, particularly argon plasma coagulation, can be attempted for tiny or uncertain remnant and recurrent lesions. In addition, intraductal radiofrequency ablation has recently been attempted for residual intraductal lesions after EP at several institutions. Although still under investigation, it has shown some promise. It might be offered as an alternative to surgery, particularly in patients who are unfit for surgery or those who refuse to undergo surgery
Recent topics on endoscopic ultrasonography-guided celiac plexus neurolysis
Ichiro Yasuda,Tatsuyuki Hanaoka,Kosuke Takahashi,Yasuhiro Araki,Shinpei Doi,Takuji Iwashita,Keisuke Iwata,Tsuyoshi Mukai 소화기인터벤션의학회 2020 Gastrointestinal Intervention Vol.9 No.4
Endoscopic ultrasonography-guided celiac plexus neurolysis (EUS-CPN) is a widely practiced technique. Three sets of guidelines have recently been published and this procedure has become a major EUS technique. However, there are still several unanswered questions. The purpose of this manuscript is to review the recent literature pertaining to EUS-CPN. Currently, the main indication of EUS-CPN is pancreatic cancer pain. It is also performed for patients with chronic pancreatitis, but the indication is controversial due to its limited efficacy and a high incidence of infectious complications. Various techniques, such as central and bilateral EUS-CPN, and EUS-guided direct celiac ganglia neurolysis (EUS-CGN) have been performed. However, the efficacies of these techniques remain controversial. Complications related to the procedures are generally not serious, but major adverse events, such as paraplegia and ischemic complications, have been reported. The impacts of EUS-CPN on survival have also been evaluated. Although increased survival was expected via improvements in the quality of life, data suggests that EUS-CPN related procedures, especially EUS-CGN, might reduce the survival time. However, precise mechanisms have not been elucidated. In addition to conventional techniques, new techniques, such as EUS-guided celiac ganglion radiofrequency ablation (EUS-RFA) and the use of highly viscous phenol-glycerol, dexmedetomidine, and contrast-enhanced agents, have been introduced. However, these techniques are still in experimental stages. Additional studies need to be conducted to address these gaps in the literature.
Recent topics on endoscopic ultrasonography-guided celiac plexus neurolysis
Ichiro Yasuda,Tatsuyuki Hanaoka,Kosuke Takahashi,Yasuhiro Araki,Shinpei Doi,Takuji Iwashita,Keisuke Iwata,Tsuyoshi Mukai 소화기인터벤션의학회 2020 International journal of gastrointestinal interven Vol.9 No.4
Endoscopic ultrasonography-guided celiac plexus neurolysis (EUS-CPN) is a widely practiced technique. Three sets of guidelines have recently been published and this procedure has become a major EUS technique. However, there are still several unanswered questions. The purpose of this manuscript is to review the recent literature pertaining to EUS-CPN. Currently, the main indication of EUS-CPN is pancreatic cancer pain. It is also performed for patients with chronic pancreatitis, but the indication is controversial due to its limited efficacy and a high incidence of infectious complications. Various techniques, such as central and bilateral EUS-CPN, and EUS-guided direct celiac ganglia neurolysis (EUS-CGN) have been performed. However, the efficacies of these techniques remain controversial. Complications related to the procedures are generally not serious, but major adverse events, such as paraplegia and ischemic complications, have been reported. The impacts of EUS-CPN on survival have also been evaluated. Although increased survival was expected via improvements in the quality of life, data suggests that EUS-CPN related procedures, especially EUS-CGN, might reduce the survival time. However, precise mechanisms have not been elucidated. In addition to conventional techniques, new techniques, such as EUS-guided celiac ganglion radiofrequency ablation (EUS-RFA) and the use of highly viscous phenol-glycerol, dexmedetomidine, and contrast-enhanced agents, have been introduced. However, these techniques are still in experimental stages. Additional studies need to be conducted to address these gaps in the literature.
Shun-Ichiro Kondo,Nobuaki Kubo,Akio Yasuda 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
Ionospheric scintillation induces a rapid change in the amplitude and phase of radio wave signals. This is due to irregularities of electron density in the F-region of the ionosphere. It reduces the accuracy of both pseudorange and carrier phase measurements in GPS/satellite based Augmentation system (SBAS) receivers, and can cause loss of lock on the satellite signal. Scintillation is not as strong at mid-latitude regions such that positioning is not affected as much. Serve effects of scintillation occur mainly in a band approximately 20 degrees on either side of the magnetic equator and sometimes in the polar and auroral regions. Most scintillation occurs for a few hours after sunset during the peak years of the solar cycle. This paper focuses on estimation of the effects of ionospheric scintillation on GPS and SBAS signals using a software receiver. Software receivers have the advantage of flexibility over conventional receivers in examining performance. PC based receivers are especially effective in studying errors such as multipath and ionospheric scintillation. This is because it is possible to analyze IF signal data stored in host PC by the various processing algorithms. A LI C/A software GPS receivers was developed consisting of a RF front-end module and a signal processing program on the PC. The RF program written in MATLAB implements signal acquisition, tracking, and pseudorange measurements. The receiver achieves standalone positioning with accuracy between 5 and 10 meters in 2drms. Typical phase locked loop (PLL) designs of GPS/SBAS receivers enable them to handle moderate amounts of scintillation. So the effects of ionospheric scintillation was estimated on the performance of GPS LI C/A and SBAS receivers in terms of degradation of PLL accuracy considering the effect of various noise sources such as thermal noise jitter, ionospheric phase jitter and dynamic stress error.
Kenji Ohwada,Tatsuo Fukuda,Jun’ichiro Mizuki,Kazuma Hirota,Hikaru Terauchi,Satoshi Tsutsui,Alfred Q. R. Baron,Hidehiro Ohwa,Naohiko Yasuda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Pb(In_(1/2)Nb_(1/2))O_3 (PIN) can be antiferroelectric (AFE), ferroelectric (FE) or a relaxor depending upon the perovskite B-site randomness. In order to clarify the effect of B-site randomness, we studied the dynamics of ordered PIN without B-site randomness (O-PIN, AFE), which will give us a clear picture of the AFE/relaxor nature of the ground state due to B-site randomness. The quasielastic (QE) scattering shows a critical slowing down near the Γ-point and the transverse acoustic (TA) mode shows a softening trend at a finite wavenumber position (not at the Γ-point) towards the AFE phase transition temperature (T_N ∼ 450 K). On the other hand, the transverse optic (TO) mode shows a softening near the Γ-point toward low temperature with no clear anomaly at T_N. These results indicate that the AFE phase transition is associated with the TA mode and the origin of the QE scattering while a ferroelectric correlation exists behind the AFE ordering. The effect of B-site randomness is finally discussed on the basis of the results.
Shimizu, Ippei,Minamino, Tohru,Toko, Haruhiro,Okada, Sho,Ikeda, Hiroyuki,Yasuda, Noritaka,Tateno, Kaoru,Moriya, Junji,Yokoyama, Masataka,Nojima, Aika,Koh, Gou Young,Akazawa, Hiroshi,Shiojima, Ichiro,K American Society for Clinical Investigation 2010 The Journal of clinical investigation Vol.120 No.5