관상동맥 시술 도중 발생한 좌주간부 관상동맥 박리에 대한 스텐트 삽입 치료의 단장기 임상 결과 : acute and long-term results

이세환,이승환,홍명기,김영학,이철환,한기훈,송종민,강덕현,송재관,김재중,박성욱,박승정 대한내과학회 2004 대한내과학회지 Vol.66 No.6

목적 : 심도자 사용 시술과 관련된 좌주간부 관상동맥박리에 대한 적절한 치료는 아직 확실히 정립되지 않은 상태이다. 이에 본 연구는 좌주간부 관상동맥 박리에 대한 스텐트 삽입술의 단장기 임상결과를 후향적으로 분석하였다. 방법 : 좌주간부 관상동맥 박리에 대한 치료로 즉각적인 스텐트 삽입술을 시행하는 것이 안전하고 효과적인 방법임을 가설하였고, 이러한 즉각적인 스텐트 삽입을 시행한 10명의 환자를 대상으로 단장기적 임상경과를 의무기록 고찰과 전화 면담을 통해서 평가하였다. 결과 : 전체 환자 모두 처음부터 좌주간부 관상동맥에 유의한 협착을 가진 환자는 없었으며, 8명의 환자는 심도자의 조작으로 인한 박리가 발생한 경우였고(진단적 혈관 조영술 중에 3명, 유도 도자 조작 중에 5명), 나머지 2명은 다른 병변에 스텐트 삽입시술을 하는 중에 박리가 발생하였다. 이 10명의 환자에서 모두 즉각적인 스텐트 삽입술이 시행되었고, 4명의 환자에서 시술 도중 혈압 저하로 Intra-aortic Ballon Pump (IABP)를 장착하였다. 모든 환자에서 성공적으로 스텐트가 삽입되었고, 병원내 사망은 1명도 없었다. 6개월 추적 관상동맥 조영술은 8명의 환자에서 시행되었다. 혈관 조영상의 재협착(직경 협착 50% 이상)은 8명 모두에게서 관찰되지 않았으며, 퇴원 후 평균 31±25개월의 추적관찰 결과 주요 심장사건은 1건도 발생하지 않았다. 결론 : 비록 대상 환자가 적은 연구였지만 좌주간부 관상동맥 박리에 대한 스텐트 삽입술은 기술적으로 안전하고 빠르게 시행 할 수 있으며, 훌륭한 단장기적인 치료 효과를 보여준다. Background : The optimal treatment of patients with left main coronary artery (LMCA) dissection during catheter-based procedure remains uncertain. We retrospectively analyzed the acute and long-term results of bail-out stenting for LMCA dissection. Methods : In cases with significant LMCA dissection occurring during catheter-based procedure, prompt stent implantation may be safe and associated with favorable clinical outcome. We evaluated the acute and long-term results of bail-out stenting for LMCA dissection occurring during catheter-bases procedure in 1- patients. Results : Initially, there was significant stenosis of LMCA segment in these patients. Catheter-induced dissection occurred in 8 patients (during diagnostic angiography in 3 patients and guiding catheter manipulation in 5 patients). Two patients suffered dissection in the setting of stent deployment in other vessels. Therefore, bail-out stenting LMCA dissection was performed in a total of 10 patients. In 4 patients, hypotension developed and intra-aortic balloon pump was placed during procedure. Stents were successfully deployed in all patients. There was no in-hospital mortality. Six-month angiographic follow-up was performed in 8 patients. Angiographic restenosis(diameter stenosis 50%) was not observed in all patients at follow-up study. During a mean follow-up of 31±25 months after hospital discharge, there was no major adverse cardiac event (death, myocardial infarction, and target lesion revascularization). Conclusion : Bail-out LMCA stenting is technically feasible, and showed good acute and long-term results in a small series of patients.

Imidazole-Azo유도체의 Spectra

李學沂,林龍進 慶北大學校 1976 論文集 Vol.21 No.-

In order to investigate the possibility as a dyestuff, the spectra of imidazole azo derivatives were studied in comparison with phenyl azo ones. The λmax of imidazole azo derivatives was 17-23 nm longer wave region than that of phenyl derivatives and it means that imidazole azo dyes have more bathochromic effect than phenly azo dyes. The spectra of substituted 2'-oxyphenyl azo imidazole showed isosbestic points in accordance with the variation of pH range in the methanol-water solution. It will be due to the protonation and deprotonation of dyes in acid-alkali solution. The authors discussed these imidazole azo dervatives on the possibility as a disperse azo dye.

회귀분석을 이용한 공사 초기단계에서 최종공사비(EAC) 추정방법

이윤미,이만희,이학기 東亞大學校 建設技術硏究所 2006 硏究論文集 Vol.29 No.2

Since having enacted the law related to the private financing about social overhead capital legislated in October 1994. the private financing projects have been settled down as the critical procedures to provide the social infrastructure. The private financing projects might not only benefit those social infrastructures such as school, welfare, and cultural facilities which need to be invested as quickly as possible in order to meet public demands, but it will lead private investment and make various private project procedures available provided that the BTL projects are activated properly in the field of education, welfare and train infirastructures. As a result of those market conditions of private financing projects, the procedures have been expanded to the newly confirmed projects and expected to hold the potential market size which might be equal to the BTO. Despite those beneficial factors, the steps reporting how to perform those projects, which one will be selected, and how to evaluate those proposals in Parliament are very complicated and difficult to go through. Consequently, the purpose of this study is to figure out the problems derived from BTL projects when compared with the traditional procedure in an educational area, and then provide the guideline to perform BTL projects efficiently and properly.

신장조직 손상의 진행에 있어서 Renin-Angiotensin System 의 역할에 관한 연구

이강욱,송정헌,강민규,황평주,김종학,나기량,서광선,박정규,신영태 대한신장학회 2001 대한신장학회잡지 Vol.20 No.3

1, 4-디케톤 置換體의 디아조 化合物 合成

李學沂,金鴻洛,李信雄 慶北大學校 1987 論文集 Vol.44 No.-

There are numerous ways in the generation of carbene intermediates. The decomposition of diazo compounds is a quite general reaction for the carbene formation. However, the synthesis of the required diazo compounds has sometimes a limitation because the diazo compounds are unstable. The cis-form of hydrazone of substituted unsaturated 1,4-diketone usually gives substituted pyridazine which is not easily decomposed to produce carbene by heat or light. In this study, trans-1,2-dibenzoylethlene was prepared from maleic anhydride via three steps. Tosylhdrazones were obtained from the reaction of tosylhydrazine with t-1,2-dibenzoylethylene in THF. The tosylhydrazone of the ketone was reacted with base catalyst to give diazo compound, 1,2-bis (diazobenzoyl) ethylene in DMF with loss p-tolunesulfinate.

NMR에 依한 trans-2-Butene-dial dioxime의 立體構造에 關한 硏究

李學沂,沈相喆,嚴在國 慶北大學校 1976 論文集 Vol.21 No.-

The structure of trans-2-butene-dial dioxime was investigated by means of NMR spectroscopy. Its conformer was found to have the planar structure conjugated with the double-bonds from the vicinal spin-spin coupling constants. The configurations of two oxime group were investigated from the solvent effects and assigned as the perfect symmetric structures, mixture of "syn-syn" and "anti-anti" forms.

Vinyl acetate의 低溫radical重合

李學沂,金祐植 慶北大學校 1975 論文集 Vol.20 No.-

Vinyl acetate was polymerized to low conversion at 0℃ with tri-n-butylborane-oxygen as initiators. The poly(vinyl acetate) prepared was saponified to poly (vinyl alcohol), and the poly(vinyl alcohol) was acetylated. The reacetylated poly(vinyl acetate) was characterized by viscosity and molecular weight. From the data, the polymer was known to be a linear molecule. The fact suggests that the reaction of transfer to main chain does not occur at 0℃ and linear PVAc can be prepared by polymerization at 0℃ without carrying out reacetylation.

상악동 후비공 용종에서 줄기의 경로에 따른 상악동구 전산화단층촬영 소견

이승훈,박동우,이승로,함창곡,이학수,김용수,박충기 한양대학교 의과대학 2002 한양의대 학술지 Vol.22 No.2

Purpose: We evaluate the pathway of the stalk of antrochoanal polyp on the coronal and axial computed tomography scans (CT), comparing with operative findings. Materials and Methods: Fourteen patients (7∼40 years old, median= 12.5 years old, ratio of male to female: 8/6) with antrochoanal polyp were examined, who took the orbitomeatal unit (OMU) CT including both coronal and axial scans as well as the operation. The CT findings and clinical findings were analyzed for the pathway of the stalk of antrochoanal polyp, comparing with the operative findings. Results: The antrochoanal polyps were mostly located on the left side (12/14, 85.7%) and equally passed through the natural and accessory ostia (7/14, 7/14) in our cases. Those that were passing through the accessory ostium were located more inferiorly and posteriorly, with preserving the natural ostium on CT scans, comparing to those via the natural ostium. However, those passing through the natural ostium had a larger stalk that eroded the uncinate process widely. So each ostium was hardly discriminated on CT scans. Conclusions: The pathway of the stalk of the antrochoanal polyp could be more specifically evaluated on both coronal and axial OMU CT scans. So, it could be more hilpful in the presurgical planning.

공공임대주택개발사업 사업성분석 프로세스 모델링

이재영,이학기 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

Public rental housing development project require the accurate and elaborate feasibility analysis to success. However the existing feasibility analysis cannot fulfill its purpose in development projects because they are based on an intuitive rather than a systematic approach. The purpose for this study is to build a process model for the effective feasibility analysis in the planning phase of the public rental housing development project. Through reviewing references, analyzing cases about feasibility analysis, and interviewing people in practical business affairs, the frame of feasibility processes and factors considered in each process were identified. Then, the relations between the factors were defined and a systematized feasibility process was eventually suggested to use IDEFO. Using this process model. the work scope of the group in charge of feasibility analysis by considering the factors which might have been passed over in practical business affairs.

축하중과 첨가질량이 작용하는 적층복합판의 진동해석

이봉학,김경진,원치문,성기태 江原大學校 産業技術硏究所 1995 産業技術硏究 Vol.15 No.-

A method of calculating the natural frequency corresponding to the first mode of vibration of beams and tower structures, with irregular cross-sections and with arbitrary boundary conditions was developed and reported by D. H. Kim in 1974. IN this paper, hte result of application of this method to the laminated plates with axial forces and with attached point mass/masses is presented. Both N? and N? forces are considered. The solution for the laminated plates with arbitrary boundary conditions and irregular section can be obtained by simply obtaining the deflection influence coefficients by any method. The effect of neglecting the mass of the plates on the natural frequency, as the ratio of the point mass/masses to the plate mass increases, is thoroughly studied. The influence of N? and N? is also carefully investigated.