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Risk factors affecting pancreatic fistulas after pancreaticoduodenectomy

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World Journal of Gastroenterology 2008年第45期14卷 6970-6974页

作者： Yun-Mee Choe Keon-Young lee Cheong-Ah Oh Joung-Bum lee Sun Keun Choi Yoon-Seok Hur Sei-Joong Kim Young Up Cho seung-Ik Ahn Kee-Chun Hong Seok-hwan Shin Kyung-Rae Kim Department of Surgery Inha University Hospital

AIM: To analyze the risk factors of pancreatic leakage after ***: We retrospectively reviewed 172 consecutive patients who had undergone pancreatico-duodenectomy at Inha University Hospital between April 1996 and March 2006. We analyzed the pancreatic fistula rate according to the clinical characteristics, the pathologic and laboratory findings, and the anastomotic ***: The incidence of developing pancreatic fistulas in patients older than 60 years of age was 21.7% (25/115), while the incidence was 8.8% (5/57) for younger patients; the difference was significant (P = 0.03). Patients with a dilated pancreatic duct had a lower rate of post-operative pancreatic fistulas than patients with a non-dilated duct (P = 0.001). Other factors, including clinical features, anastomotic methods, and pathologic diagnosis, did not show any statistical difference. CONCLUSION: Our study demonstrated that pancreatic fistulas are related to age and a dilated pancreatic duct. The surgeon must take these risk factors into consideration when performing a pancre-aticoduodenectomy.

关键词： Pancreaticoduodenectomy Pancreatic fistula Pancreatic leakage

Occipital artery bypass importance in unsuitable superficial temporal artery:Two case reports

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World Journal of Clinical Cases 2023年第9期11卷 2091-2097页

作者： Jong-hwan Hong Sung-Chan Jung Han-seung Ryu Tae-Sun Kim Sung-Pil Joo Department of Neurosurgery Chonnam National University Hospital and Medical SchoolGwangju 61469South Korea

BACKGROUND Superficial temporal artery-middle cerebral artery(STA-MCA)bypass helps treat cerebral ***,the STA is not available for bypass in some ***,with some technical tips,the authors introduced a bypass technique using the occipital artery(OA).CASE SUMMARY Two female patients complained of *** magnetic resonance imaging(MRI)indicated contralateral infarction from the MCA *** Diamox single photon emission computed tomography or perfusion MRI,the contralateral front parietotemporal reserve was *** transfemoral cerebral angiography,the STA was thin with a weak flow;however,the OA was *** OA-MCA end-to-side extracranial-intracranial bypass surgery was implemented instead of STA because the caliber was too *** postoperative course was uneventful in both cases,with well-maintained bypass patency and neurological stability during *** OA might be an acceptable alternative for MCA cerebral ischemic cases with an unsuitable STA.

关键词： Bypass Occipital artery Superficial temporal artery Cerebral ischemia Case report

Nanowire-assisted freestanding liquid metal thin-film patterns for highly stretchable electrodes on 3D surfaces

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npj Flexible Electronics 2022年第1期6卷 956-963页

作者： Minwoo Kim Chulmin Cho Wooseop Shin Jung Jae Park Jaewon Kim Phillip Won Carmel Majidi seung hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National UniversitySeoulGwanak-guKorea Mechatronics Research Samsung ElectronicsHwaseong-siGyeonggi-doKorea Soft Machines Lab Department of Mechanical EngineeringCarnegie Mellon UniversityPittsburghPAUSA Institute of Advanced Machines and Design/Institute of Engineering Research Seoul National UniversitySeoulKorea

Stretchable electronics is playing an integral role in fields such as wearable electronics and soft *** soft conductive materials,liquid metal is drawing intense attention as an electrode material due to its liquid nature at room ***,the merits of liquid metal conductor are limited by the presence of substrates or enclosed microchannels from physical disturbances by the underlying substrate when applying it to 3D surface and modifying complex *** overcome this limitation,we develop freestanding patterned liquid metal thin-film conductor(FS-GaIn).FS-GaIn was achieved by introducing metal nanowires to liquid metal and subsequent sequential selective laser processing and etching of directly patterned *** can be applied directly to nonflat surface without *** incorporated into electrical circuits,FS-GaIn shows high electrical conductivity,stretchability,and *** concept of freestanding liquid metal can open a functionality to the conventional liquid metal electronics.

关键词： liquid film free

Comparative Study of Various Preparation Methods of Colloidal Silica

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Engineering（科研） 2010年第12期2卷 998-1005页

作者： Hyung Mi Lim Jinho lee Jeong-hwan Jeong Seong-Geun Oh seung-Ho lee 不详

Colloidal silica can be prepared by various methods and starting materials including ion exchange of aqueous silicates, hydrolysis and condensation of silicon compounds, direct oxidation of silicon, and milling and peptization of silica powder. Various silica sols having particle sizes of 10-60 nm prepared by these methods and the preparation methods have been compared on the basis of their shape, size uniformity, sphericity, stability against pH variation, cation concentration, and price, etc. Silica sol prepared from tetraethoxysilane affords uniform size control and growth, and high purity, despite the relatively high costs. Silica sol prepared from liquid silicates affords relatively easy size and shape control;however, it is difficult to lower the alkali content to a level that is appropriate for carrying out semiconductor chemical mechanical polishing processes;in addition, the waste water treatment carried out for recovering the ion exchange resin gives rise environmental consideration. The properties of colloidal silica prepared from fumed silica powder by milling and dispersion depend on the starting silica source and it is relatively difficult to obtain monodispersed particles using this method. Colloidal silica prepared from silicon by direct oxidation has a monodispersed spherical shape and purity control with reasonable prices. It generates less waste water because it can be directly produced in relatively high concentrations. The cation fraction located in the particle relative to the free cation in the fluid is relatively lower in the silica sol prepared by the direct oxidation than others. A careful comparison of colloidal silica and the preparation methods may help in choosing the proper colloidal silica that is the most appropriate for the application being considered.

关键词： Colloidal Silica Comparison Preparation Methods Shape Cation Location

Distant skeletal muscle metastasis from intrahepatic cholangiocarcinoma presenting as Budd-Chiari syndrome

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World Journal of Gastroenterology 2007年第22期13卷 3141-3143页

作者： Oh Sung Kwon Dae Won Jun Sang Heum Kim Mee Yeon Chung Nam In Kim Moon Hee Song Han Hyo lee seung hwan Kim Yoon Ju Jo Young Sook Park Jong Eun Joo Department of Internal Medicine Eulji University Hospital Seoul Korea Department of Radiology Eulji University Hospital Seoul Korea Department of Pathology Eulji University Hospital Seoul Korea

Intrahepatic cholangiocarcinoma is a malignant neoplasm arising from the biliary epithelium, which frequently invades adjacent organs or metastasizes to other visceral organs such as the lungs, bones, adrenals, and brain. However, distant skeletal muscle metastasis of cholangiocarcinoma has never been described before to the best of our knowledge and, furthermore, Budd-Chiari syndrome secondary to intrahepatic cholangiocarcinoma is also extremely rare. Here we present the first case overall of distant muscle metastasis from intrahepatic cholangiocarcinoma presenting as Budd-Chiari syndrome. A 44-year-old man admitted to the hospital with complaints of abdominal distension, edema of both legs, back pain and anorexia of 30 d' duration. Computed tomography and ultrasonography-guided percutaneous muscle biopsy established intrahepatic cholangiocarcinoma with disseminated thrombosis from inferior vena cava to bilateral iliac and femoral veins, and multiple skeletal muscle metastases in bilateral buttock and erector spinal muscle.

关键词： Intrahepatic Cholangiocarcinoma Metastasis Skeletal muscle Budd-Chiari syndrome

Bird-mimetic Wing System of Flapping-wing Micro Air Vehicle with Autonomous Flight Control Capability

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Journal of Bionic Engineering 2016年第3期13卷 458-467页

作者： Sriyulianti Widhiarini Ji hwan Park Bum Soo Yoon Kwang Joon Yoon ll-Hyun Paik Jong Heon Kim Chan Yik Park seung Moon Jun Changho Nam Department of Aerospace Engineering Konkuk University Gwangjin-gu Seoul South Korea Deptartment of PGM Technology Hanwha Corp. R&D Center Daejeon South Korea Agency for Defense Development Daejeon South Korea Department of Engineering Technology Arizona State University Mesa Arizona

A micro air vehicle with a bird-mimetic up-down and twisting wing drive system was developed in this study. The Flap- ping-wing Micro Air Vehicle （FMAV）, with a 50 cm wingspan and a double-crank drive system, performed successful flights of up to 23 min. The performance and capabilities of the FMAV were enhanced by adapting a number of unique features, such as a bird-mimetic wing shape with a span-wise camber and an up-down and twisting wing drive mechanism with double-crank linkages, This lift-enhancing design by mimicking the flapping mechanism of a bird＇s wing enabled the 210 g FMAV to fly autonomously in an outdoor field under wind speeds of less than 5 m.s-1. Autonomous flight was enabled by installing a flight control computer with a micro-electro-mechanical gyroscope and accelerometers, along with a micro video camera and an ultralight wireless communication system inside the fuselage. A comprehensive wind tunnel test shows that the FMAV with a high-camber wing and double-crank mechanism generates more lift and less net thrust than the FMAV with a flat wing and single-crank mechanism, which confirms the improved performance of the developed FMAV, as well as the superior slow flying or hovering capabilities of the FMAV with a high-camber wing and double-crank wing drive system.

关键词： flapping-wing MAV autonomous flight biomimetic wing double crank wing

Helicobacter pylori in middle ear of children with

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Chinese Medical Journal 2011年第24期 4275-4278页

作者： PARK Chul-won CHUNG Jae-ho MIN Hyun-jung KIM Kyung-rae TAE Kyung CHO Seok-hyun lee seung-hwan Department of Otolaryngology-Head and Neck Surgery School ofMedicine Hanyang University Seoul Korea

Background Otitis media with effusion （OME） is a common pediatric disease, but its pathogenesis remains uncertain. The relationship between OME and Helicobacter pylori （HP） is currently being studied, and a relationship has not yet been confirmed. The purpose of this study was to show that a relationship does exist between HP and OME. Methods The study consisted of 60 patients who were diagnosed with OME and had ventilation tube insertions with or without an adenoidectomy. This study included an additional 30 patients who had only received an adenoidectomy without being diagnosed with OME. The effusion samples were analyzed with polymerase chain reaction （PCR） and the campylobacter-like organism （CLO） test. The adenoid tissue samples were analyzed with the CLO test. Results Eighteen patients among the 60 patients （30%） tested positive for HP. In the cases with adenoids, 15.6% of the OME patients and 13.3% of the adenoidectomy only patients were positive for HP. There were no differences between the prevalence of HP in the adenoids of OME patients and the patients without OME. Conclusion HP can be considered one of the causes of OME.

关键词： Helicobacter pylori otitis media effusion

Effect of preoperative biliary drainage on surgical results after pancreaticoduodenectomy in patients with distal common bile duct cancer:Focused on the rate of decrease in serum bilirubin

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World Journal of Gastroenterology 2008年第7期14卷 1102-1107页

作者： Yun Mee Choi Eung-Ho Cho Keon-Young lee seung-Ik Ahn Sun Keun Choi Sei Joong Kim Yoon Seok Hur Young Up Cho Kee-Chun Hong Seok-hwan Shin Kyung Rae Kim Ze-Hong Woo Department of Surgery College of MedicineInha UniversityIncheonKorea

AIM: To examine if the rate of decrease in serum bilirubin after preoperative biliary drainagecan be used as a predicting factor for surgical complications and postoperative recovery after pancreaticoduodenectomy in patients with distal common bile duct ***: A retrospective study was performed in 49 consecutive patients who underwent pancrea-ticoduodenectomy for distal common bile duct cancer. Potential risk factors were compared between the complicated and uncomplicated groups. Also, the rates of decrease in serum bilirubin were compared pre- and postoperatively. RESULTS: Preoperative biliary drainage (PBD) was performed in 40 patients (81.6%). Postoperative morbidity and mortality rates were 46.9% (23/49) and 6.1% (3/49), respectively. The presence or absence of PBD was not different between the complicated and uncomplicated groups. In patients with PBD, neither the absolute level nor the rate of decrease in serum bilirubin was significantly different. Patients with rapid decrease preoperatively showed faster decrease during the first postoperative week (5.5 ± 4.4 μmol/L vs -1.7 ± 9.9 μmol/L, P = 0.004).CONCLUSION: PBD does not affect the surgical outcome of pancreaticoduodenectomy in patients with distal common bile duct cancer. There is a certain group of patients with a compromised hepatic excretory function, which is represented by the slow rate of decrease in serum bilirubin after PBD.

关键词： Distal bile duct cancer Drainage Bilirubin Rate

Endoscopic repair of delayed stomach perforation caused by penetrating trauma:A case report

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World Journal of Clinical Cases 2021年第5期9卷 1228-1236页

作者： Jae Hyun Yoon Chung hwan Jun Jae Pil Han Ji-Woong Yeom seung-Ku Kang Hyun Yi Kook Sung KyuChoi Department of Gastroenterology and Hepatology Chonnam National University Hospital and College of MedicineGwangju 61469South Korea Department of Internal Medicine Mokpo Hankook HospitalMokpo 58643South Korea Department of Surgery Mokpo Hankook HospitalMokpo 58643South Korea Department of Cardiothoracic Surgery Mokpo Hankook HospitalMokpo 58643South Korea Department of Nursing Chonnam National University Hospitaland College of NursingGwangju 61469South Korea

BACKGROUND Primary endoscopic closure of a perforated gastric wall during endoscopic procedures is mostly effective and well-tolerated;however,there are very few studies on the efficacy of endoscopic management of delayed traumatic gastric ***,we report a novel case of a patient who was successfully treated for delayed traumatic stomach perforation using an alternative endoscopic *** SUMMARY A 39-year-old woman presented with multiple penetrating traumas in the back and left abdominal *** imaging studies revealed left diaphragmatic disruption and peri-splenic hemorrhage without gastric *** emergency primary repair of the disrupted diaphragm with omental reduction and suturing of the lacerated lung was performed;however,delayed free perforation of the gastric wall was noted on computed tomography after 3 *** an emergency abdominal surgery for the primary repair of the gastric wall,re-perforation was noted 15 d *** high risk associated with re-surgery prompted an endoscopic intervention using 2 endoloops and 11 endoscopic clips using a novel modified purse-string suture *** free perforated gastric wall was successfully repaired without additional surgery or *** patient was discharged after 46 d without any *** Endoscopic closure with endoloops and clips can be a useful therapeutic alternative to re-surgery for delayed traumatic gastric perforation.

关键词： Surgical endoscopy Trauma Stomach Re-perforation Endoloop Case report