Choledochoscopic high-frequency needle-knife electrotomy as an effective treatment for intrahepatic biliary strictures

2015 ◽  
Vol 30 (9) ◽  
pp. 1438-1443 ◽  
Author(s):  
Yu-Long Yang ◽  
Cheng Zhang ◽  
Gang Zhao ◽  
Ping Wu ◽  
Yue-Feng Ma ◽  
...  
Keyword(s):  
Effective Treatment ◽  
High Frequency ◽  
Biliary Strictures ◽  
Needle Knife

scholarly journals One-step percutaneous transhepatic cholangioscopy combined with high-frequency needle-knife electrotomy in biliary strictures after liver transplantation

2020 ◽  
Author(s):  
Haisu Tao ◽  
Ping Wang ◽  
Beiwang Sun ◽  
Xinghua Zhou ◽  
Jiafen Xie
Keyword(s):  
Liver Transplantation ◽  
Conservative Treatment ◽  
High Frequency ◽  
Catheter Removal ◽  
Endoscopic Management ◽  
Biliary Strictures ◽  
One Step ◽  
Percutaneous Transhepatic Cholangioscopy ◽  
Needle Knife

Abstract Background Endoscopic management is the mainstay for biliary strictures after liver transplantation. However, this method is often failed in cases associated with hepatolithiasis or refractory strictures. The aim of this study is to investigate whether one-step PTC combined with high-frequency needle-knife electrotomy can be an alternative method in biliary strictures after liver transplantation that could not be treated by endoscopic management. Methods Clinical data of 14 patients suffering from biliary strictures after liver transplantation from June 2014 to January 2018 were retrospectively analyzed. One-step PTC combined with high-frequency needle-knife electrotomy was used to resolve the strictures. Results One-step PTC was successfully performed in all 14 patients. In 10 of 12 (83.3%) patients with hepatolithiasis, the stones were removed completely. The stricture resolution was achieved in 13 of 14 (92.9%) patients at supporting catheter removal. Three mild adverse events occurred (cholangitis, 2 patient; delayed hemobilia, 1 patient), but were resolved with conservative treatment. The follow up after supporting catheter removal was 15.7 ± 4.5 months. Only 1 patient (8.3%) had stone recurrence and no stenosis occurred during supporting-free follow-up. Conclusion One-step PTC combined with high-frequency needle-knife electrotomy appears to be a useful for treating biliary strictures after liver transplantation.

scholarly journals Effective treatment of symptomatic diabetic polyneuropathy by high-frequency external muscle stimulation

Diabetologia ◽  
2005 ◽  
Vol 48 (5) ◽  
pp. 824-828 ◽  
Author(s):  
L. Reichstein ◽  
S. Labrenz ◽  
D. Ziegler ◽  
S. Martin
Keyword(s):  
Effective Treatment ◽  
High Frequency ◽  
Diabetic Polyneuropathy ◽  
Muscle Stimulation

High frequency rTMS; a more effective treatment for auditory verbal hallucinations?

2014 ◽  
Vol 224 (3) ◽  
pp. 204-210 ◽  
Author(s):  
Antoin D. de Weijer ◽  
Iris E.C. Sommer ◽  
Anne Lotte Meijering ◽  
Mirjam Bloemendaal ◽  
Sebastiaan F.W. Neggers ◽  
...  
Keyword(s):  
Effective Treatment ◽  
High Frequency ◽  
Auditory Verbal Hallucinations

scholarly journals Choledochoscopic high-frequency needle-knife electrotomy for treatment of anastomotic strictures after Roux-en-Y hepaticojejunostomy

2016 ◽  
Vol 16 (1) ◽  
Author(s):  
Yu-long Yang ◽  
Cheng Zhang ◽  
Ping Wu ◽  
Yue-feng Ma ◽  
Jing-yi Li ◽  
...  
Keyword(s):  
High Frequency ◽  
Anastomotic Strictures ◽  
Needle Knife

The Microstructure of Steatite (Protoenstatite)

1985 ◽  
Vol 43 ◽  
pp. 236-237
Author(s):  
W. E. Lee ◽  
A. H. Heuer
Keyword(s):  
High Frequency ◽  
Glass Ceramics ◽  
Magnesium Silicate ◽  
Beam Current ◽  
Glassy Matrix ◽  
Angle Of Incidence ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Argon Ions ◽  
High Temperature Polymorph

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

Simulations of high-resolution images of amorphous silicon films

1986 ◽  
Vol 44 ◽  
pp. 544-545
Author(s):  
G. Y. Fan ◽  
J. M. Cowley
Keyword(s):  
Electron Microscope ◽  
High Frequency ◽  
Fourier Transformation ◽  
Amorphous Materials ◽  
Low Frequency ◽  
Chromatic Aberration ◽  
Structure Information ◽  
Frequency Components ◽  
High Resolution Images ◽  
Spatial Frequency Spectrum

It is well known that the structure information on the specimen is not always faithfully transferred through the electron microscope. Firstly, the spatial frequency spectrum is modulated by the transfer function (TF) at the focal plane. Secondly, the spectrum suffers high frequency cut-off by the aperture (or effectively damping terms such as chromatic aberration). While these do not have essential effect on imaging crystal periodicity as long as the low order Bragg spots are inside the aperture, although the contrast may be reversed, they may change the appearance of images of amorphous materials completely. Because the spectrum of amorphous materials is continuous, modulation of it emphasizes some components while weakening others. Especially the cut-off of high frequency components, which contribute to amorphous image just as strongly as low frequency components can have a fundamental effect. This can be illustrated through computer simulation. Imaging of a whitenoise object with an electron microscope without TF limitation gives Fig. 1a, which is obtained by Fourier transformation of a constant amplitude combined with random phases generated by computer.

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