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조창락(Chang Rak Cho),황경국(Kyung Kuk Hwang),김태현(Tae Hun Kim),신건성(Gun Seong Sheen),장유현(Yoo Hyun Jang),이대희(Dae Hee Lee),전재석(Jae Seong Jeon),이동호(Dong Ho Lee),한철주(Chul Ju Han),정현채(Hyun Chae Jung),윤용범(Yong Bum 대한내과학회 1996 대한내과학회지 Vol.50 No.6
The most common complications of chronic pancreatitis are pancreatic calcification, diabetes mellitus, steatorrhea, pancreatic pseudocyst and upper gastrointestinal bleeding. Pesudoaneurysm whether with pseudocyst or nat may cause gasrointestinal bleeding and it is a serious complication. Erosion of visceral artery with pseudoaneurysm formation may bleed into pancreatic duct which is known as emosuccus Pancreaticus. On rare occasions, pseudoaneurysm may bleed into adjacent organs (stomach, duodenum, colon). A 56-year-old man was admitted to Seoul National University Hospital with repeaoted hematemesis. With repeated gastroscopy, we found submucosal tumor like lesion in the stomach. Computed tomography and celiac angiography showed splenic artery pseudoaneurysm, which at operation was found to have ruptured into the stomach. The pseudoaneurysm and spleen were removed and the patient has had no further bleeding, When gastrointestinal bleeding is associated with chronic pancreatitis and the usual sources of bleeding are not detected by endoscopy, the rupture of a pseudoaneurysm schould be considered as one of the causes.
조창락(Chang Rak Cho),김태헌(Tae Hun Kim),신건성(Gun Seong Sheen),장유현(Yoo Hyun Jang),한철주(Chul Ju Han),이동수(Dong Soo Lee),정현채(Hyun Chae Jung),송인성(In Sung Song),최규완(Kyoo Wan Choi),김정룡(Chung Yong Kim) 대한내과학회 1996 대한내과학회지 Vol.50 No.1
Hypoalbuminemia due to gastrointestinal loss of protein has been reported in association with many pathologic conditions of stomach and bowel. We have recently experienced a 63 year old man with stomach cancer presenting with generalized edema. The patient .had severe hypoalbuminemia and we confirmed protein loss through the gastric mucosa as its cause by 99mTc labled albumin scan and alpha 1 antitrypsin clearance test. The possiblility of other coincidental gastrointestinal lesion was excluded. After total gastrectomy, hypoalbuminemia was corrected to normal range without replacement of albumin and follow up albumin scan revealed no albumin loss. To our knowledge there have been a few case reports of protein losing gastroenteropathy due to stomach cancer. Therefore, it is recommended to exclude cancer at first, when an etiologic diagnosis is scheduled for the differentiation of protein losing enteropathy in this country
원자짝 분포 함수를 이용한 칼슘 실리케이트 경화체의 나노 구조 변형 거동 해석
배성철 ( Bae Sung-chul ),장유현 ( Chang Yoo-hyun ),지현석 ( Jee Hyeon-seok ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.2
Calcium Silicate Hydrate (C-S-H), which takes up most of the hydration products of Portland Cement (PC), has the greatest impact on the mechanical behavior and strength development of concrete. The exact mechanism of its deformation, however, has not yet been elucidated. The present study aims to demonstrate the mechanism of nano-deformation behavior of C-S-H in tricalcium silicate paste under compressive loading, unloading and reloading by interpreting atomic pair distribution function (PDF) based on synchrotron X-ray scattering. The strain of the tricalcium silicate paste for a short-range of 0 ~ 20 A under compressive load exhibited two stages, I) nano-packing of interlayer of C-S-H and II) micro-packing of C-S-H globules, whereas the deformation for a long-range order of 20 ~ 40 A was similar to that of a calcium hydroxide phase measured by Bragg peak shift. Moreover, the residual strains due to the plastic deformation of C-S-H was clearly observed.
K-ras 변이가 있는 췌장암세포주에서 Mitogen Activated Protein Kinase와 PI 3-kinase가 세포증식에 미치는 역할
류지곤(Ji Kon Ryu),김진(Jin Kim),장유현(Yoo Hyun Chang),이우진(Woo Jin Lee),김용태(Yong Tae Kim),윤용범(Yong Bum Yoon),김정룡(Chung Yong Kim) 대한소화기학회 2000 대한소화기학회지 Vol.36 No.3
Background/Aims: K-ras mutation is considered to be important for the development and proliferation of pancreatic cancer. After activation of Ras protein, several cytoplasmic protein kinases, such as the mitogen activated protein kinase (MAPK) signaling cascade and PI 3-kinase, are sequentially stimulated. The aim of this study was to examine the role of MAPK and PI 3-kinase on cellular proliferation of pancreatic cancer cell lines with K-ras mutation. Methods: MiaPaCa-2 and Panc-1 cell lines were cultured and stimulated with growth factors such as fetal bovine serum (FBS) and epidermal growth factor (EGF). The cell proliferation was measured by 3H thymidine incorporation assay. MAPK/extracellular signal regulated kinase (ERK) activating kinase (MEK) inhibitor (PD098059) or PI 3- kinase inhibitor (wortmannin) was added in media and their effects on proliferation were examined. The activity of ERK was measured by immunoblotting assay. Results: FBS stimulated cell proliferation dose-dependently in both cell lines but EGF did not. PD098059 blocked dose-dependently the cell proliferation but wortmannin did not. The activities of ERK were increased by both FBS and EGF and blocked only by PD098059. Conclusions: MAPK kinase signal transduction pathway from MEK to ERK plays an important role in the stimulation of proliferation in pancreatic cancer cell lines with K-ras mutation. (Kor J Gastroenterol 2000;36:372 - 382)
내시경적 역행성 담췌관조영술 후의 발열에 대한 연구 - 위험인자와 예방적 항생제 사용 효과 분석 -
서승오(Seong O Seo),천재희(Jae Hee Chun),김상균(Sang Kyun Kim),김진(Jin Kim),장유현(Yoo Hyun Chang),김용태(Yong Tae Kim),윤용범(Yong Bum Yoon),김정룡(Chung Yong Kim) 대한소화기학회 2000 대한소화기학회지 Vol.36 No.3
Background/Aims : Fever and cholangitis can be serious complications after endoscopic retrograde cholangiopancreatography (ERCP). The risk factors of these complications and the efficacy of prophylactic antibiotics are not clearly verified yet. In this study, we investigated the frequency, risk factors, pathogens of the fever after ERCP, and evaluated the effect of prophylactic antibiotics. Methods : Retrospective analysis was performed on 674 patients who underwent ERCP between 1996 and 1999. Results : Fever after ERCP occurred in 68 of 674 cases (10.1%). Twenty-six kinds of bacteria were isolated in 23 of 68 febrile cases (33.8%). Fever occurred more frequently in patients (33.4%) in whom therapeutic ERCP failed to remove common bile duct (CBD) stones or to drain obstructed bile duct than in patients (7.3%) with effective drainage (p<0.001). Therapeutic procedure after ERCP caused fever more frequently (16.7%) than diagnostic ERCP only (4.2%)(p=0.03). Moreover, fever was also developed frequently after endoscopic retrograde biliary drainage (ERBD). Prophylactic administration of more than 2 kinds of antibiotics can reduce the rate of fever occurrence after ERCP. Conclusions : Therapeutic ERCP procedures especially after ERBD or unsuccessful biliary drainage were the high risk factors for fever after ERCP. Prophylactic antibiotic treatment using more than two kinds of antibiotics can reduce the incidence of the fever after ERCP. (Kor J Gastroenterol 2000;36:390 - 397)
김태헌,송인성,정현채,최규완,이준행,김정룡,한철주,장유현,신건성,조창락,임영석 대한소화기내시경학회 1995 Clinical Endoscopy Vol.15 No.3
The endoscopic diagnosis of gastric carcinoid has been considered difficult. Reported cases of this tumor diagnosed by endoscopic examination are rare. And the gastric carcinoid with massive upper gastrointestinal bleeding is a rare disease entity. We experienced a case of gastric carcinoid admitted to the hospital because of hematemesis, melena and syncope. And it was diagnosed by endoscopic biopsy, although it resembled type IIa+IIc early gastric cancer at endoscopic examination. To our knowledge, this is the first case report of gastric carcinoid tumor mimicking early gastric cancer. So we report this case with a review of relevant literatures.
한상욱,박재갑,김태헌,송인성,정현채,최규완,김정룡,한철주,윤용범,장유현,신건성,조창락 대한소화기내시경학회 1995 Clinical Endoscopy Vol.15 No.3
The prevalence of colon cancer is increasing in Korea and the principal strategy of its management is early detection and surgical resection. For the early detection of colon cancer, endoscopic evaluation is important and the ability to find out early stage small lesion is needed for the endoscopist. To find out encloscopic features of early colon cancer, we reviewed 17 cases of early colon cancer who have admitted to Seoul National University Hospital from January 1982 to December 1993. 1)59% of the lesions were located in rectum and the size ranged from 0.7cm to 9cm, all of the 17 cases showed polypoid mass contour and the surface of them had erosion, hyperemia, ulceration and easy touch bleeding tendency. 2) Colon cancer was diagnosed by endoscopic gross findings in 41% and endoscopic biopsy could confirm colon cancer in 70%. However, barium enema could diagnose only 41% of early colon cancer. 3) Five cases were operated under the diagnosis of colonic adenoma which were large($gt;3 cm) villous type or contained severe dysplasia 4) Submucosal tumor infiltration was found in 10 cases and 65% had associated adenoma 5) Lymph node involvement was none and there was no recurrence in 47 month follow up period after various surgical treatments.
표면평탄형 조기위암 (EGC IIb) 의 내시경적 소견
이동호,김태헌,송인성,김용태,정현채,김용일,최규완,김정룡,한철주,윤용범,장유현,김선미,신건성,조창락 대한소화기내시경학회 1995 Clinical Endoscopy Vol.15 No.3
Early gastric cancer(EGC) has been proved to be a malignant tumor with favorable prognosis in contrast to the advanced one, thus early diagnosis has always been the emphasis regardless its type. In particular, diagnosis of superficial flat type EGC(IIb) is extremely difficult on gross inspection. The aim of this study is to review the clinical features of the patients with EGC type IIb, with special reference to the endoscopic appearance of tumor. We reviewed the medical records and endoscopic findings of 13 patients which were thereafter surgically resected and pathologically proven EGC type IIb at SNUH from 1989 to 1993. The depressed lesion was observed most frequently in EGC type IIb. The endoscopic suggestion of EGC type IIb were given initially with mucosal bleeding and discoloration. In 3 cases (20%), tumor extended to the submucosa and in only 1 case, lymph node metastasis was found. Four patients(30.9%) had another coincidental EGC or peptic ulcer. Every possible effort is needed not to omit the resectable cancer when the mucosal bleeding and discoloration is observed. Careful observation is recommended not to overlook coincidental lesions.