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.

건설업체의 품질보증 시스템 개선안에 관한 연구

이재영,이학기 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.1

ISO 9000 system that is the international standard of quality assurance and quality management has been accepted in domestic construction industry as a means of verifying a external credit of company and creating a quality assurance system. But there are many problems in regulating application because of applying this without considerate speciality of construction industry. Each of its element - designer, contractor, regulator and owner in construction project play an increasingly important role. This study propose to establish the applicative system of ISO 9000 system for construction company based on ISO 9000 ; 2000 version. On this system two item, ‘Owner’ and ‘Design management’ are separated from each item in ISO 9000 ; 2000 version.

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.

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.

低溫光反應 裝置의 製作과 이를 利用한 테트라페닐디아조시클로펜타디엔의 低溫光反應

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

The apparatus for low temperature photoreaction is very useful one for detecting reactive intermediates such as carbene, benzyne etc. So, the major portion of this work dealt with the construction of apparatus for low temperature photoreaction. And tetraphenyldianzocyclopentadiene was synthesized as a precursor by reaction of benzil with 1, 3-diphenylacetone and p-toluenesulfonylhydrazide. Using this apparatus constructed for low temperature photoreaction, tetraphenyldiazocyclopentadiene was irrdiated by UV (λ>280nm) at 10K, 7 exp (-6)mbar. Irradiation of tetraphenyldiazocyclopentadiene through quartz window at 10K gave three new strong IR peaks; 2,110 cm^-1, 1,675cm^-1, and 765cm^-1. Comparison with the results of matrix isolated study of diazocyclopentadiene, it was believed photoproducts to be tetraphenylcyclopentadienylidene (765cm^-1) as carbene and tetraphenylcyclopropenylallene (2,110cm^-1, 1,675cm^-1) formed by intramolecular rearrangement of the carbene.

특발성 과호산구 증후군 환자의 치료 도중 발생한 간혈종 1례

이영태,김동기,박지훈,김윤정,김기향,박보민,권민정,김애란,이원식,주영돈,손창학 白中央醫療院 2005 仁濟醫學 Vol.26 No.1

Idiopathic hypereosinophilic syndrome is characterized by marked elevation of eosinophil count ( >1,500/㎣) in peripheral blood without explaining etiology. It shows tissue involvement in many organs such as liver, G-I tract, myocar dium, lung, skin, kidney and nerve. Some case of hypereosinophilic syndrome with hepatic involvement have been reported, but not much. We have recently experienced a case with idiopathic hypereosinophilic syndrome of a 40 year old man who presented with RUQ pain. By abdominal CT, ill- defined subcapsular hematoma was detected. Liver biopsy showed eosinophilic infiltration within the portal tract and sinusoid. Drain procedure and corticosteroid adminiiatbrought marked improvement of clinical manifestation, hematologic abnormality and radiologic abnormality.

코스닥시장 등록 벤처기업의 재무적 특성

이기환,우재준,유학수 한국중소기업학회 2000 기업가정신과 벤처연구 Vol.3 No.1

This paper examines the financial characteristics of venture businesses listed on KOSDAQ. We compares the financial features of 94 venture businesses with 94 matching firms listed on KOSDAQ, focusing on profitability, growth, activity and productivity of both groups. The difference analysis of the financial ratios between venture and nonventure enterprises will be tested through t-test. The return on asset, the return on equity, and the growth rate of total asset of venture businesses are higher than nonventure businesses. This evidence is consistent with the existing result which the venture businesses show higher performance in the profitability. We found that venture businesses show lower debt ratio and liquidity than nonventure businesses. This suggests that venture enterprises should raise new funds from venture capital firms or other financial institutions in order to avoid the sudden default risk.

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.

小員環 化合物에 關한 硏究 : Li-Bistosylhydrazone의 熱分解 生成物에 關하여 Products of the Lithium Fumaraldehyde Bistosylhydrazone Pyrolysis

李學沂,林龍進,沈相喆 경북대학교 공과대학 1971 工大硏究誌 Vol.1 No.-

The pyrolysis of dry lithiun salt of fumaraldehyde tosylhydrazone which was prepared by reacting fumaraldehyde and tosylhydrazine was studied. The products of therm a decomposition, acetylene, ethytlene and unidentified gaseous substances, were separated by GC to learn the ratio of the products which was variable according to the reaction conditions. The investigaton of the path route to form acetylene, ethylene and unidentified compounds remains for further work to learn the mechanism of tetrahedrane formation.