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Hwang, Kihwan,Hwang, Gyojun,Kwon, O-Ki The Korean Neurosurgical Society 2014 Journal of Korean neurosurgical society Vol.56 No.6
A ruptured distal lenticulostriate artery (LSA) aneurysm is detected occasionally in moyamoya disease (MMD) patients presented with intracerebral hemorrhage. If the aneurysm is detected in hemorrhage site on angiographic evaluation, its obliteration could be considered, because it rebleeds frequently, and is associated with poorer outcome and mortality in MMD related hemorrhage. In this case report, the authors present two MMD cases with ruptured distal LSA aneurysm treated by endovascular embolization.
Growth Pattern and Prognostic Factors of Untreated Nonfunctioning Pituitary Adenomas
Hwang, Kihwan,Kwon, Taehun,Park, Jay,Joo, Jin-Deok,Han, Jung Ho,Oh, Chang Wan,Kim, Chae-Yong The Korean Neurosurgical Society 2019 Journal of Korean neurosurgical society Vol.62 No.2
Objective : Pituitary adenomas (PAs) are often detected as incidental findings. However, the natural history remains unclear. The objective of this study was to evaluate the natural history and growth pattern of untreated PAs. Methods : Between 2003 and 2014, 59 PAs were managed with clinico-radiological follow up for longer than 12 months without any kind of therapeutic intervention. Tumor volumes were calculated at initial and last follow-up visit, and tumor growth during the observation period was determined. Data were analyzed according to clinical and imaging characteristics. Results : The mean initial and last tumor volume and diameter were $1.83{\pm}2.97mL$ and $13.77{\pm}6.45mm$, $2.85{\pm}4.47mL$ and $15.75{\pm}8.08mm$, respectively. The mean annual tumor growth rate was $0.33{\pm}0.68mL/year$ during a mean observation period of $46.8{\pm}32.1months$. Sixteen (27%) PAs showed tumor growth. The initial tumor size (HR, 1.140; 95% confidence interval, 1.003-1.295; p=0.045) was the independent predictive factor that determined the tumor growth. Six patients (11%) of 56 conservatively managed non-symptomatic PAs underwent resection for aggravating visual symptoms with mean interval of 34.5 months from diagnosis. By Cox regression analysis, PAs of last longest diameter over 21.75 mm were a significant prognostic factor for eventual treatment. Conclusion : The initial tumor size of PAs was independently associated with the tumor growth. Six patients (11%) of conservatively managed PAs were likely to be treated eventually. PAs of last follow-up longest diameter over 21.75 mm were a significant prognostic factor for treatment. Further studies with a large series are required to determine treatment strategy.
황기환,전계석 慶熙大學校 1998 論文集 Vol.27 No.-
In this paper, we have studied the design and construction methods for the development of STAM(Scanning Tomographic Acoustic Microscope). STAM is a tomographic image reconstruction system using ultrasound. In order to obtain tomographic image information needed in image processing, this system requires the detection method for receiving both amplitude and phase information of the ultrasonic signal simultaneously and the multi-projection method for acquiring tomographic data to the three-dimensional structure of an object. In this study, for the construction of STAM, we have made a quadrature signal detector which is capable of detecting both amplitude and phase information from the conventional SLAM(Scanning Laser Acoustic Microscope), and a specimen rotation device for acquiring tomographic data, respectively. In this experiment, it has been shown that the STAM can give the separated tomographic images of each layer for the specimen which consists of two layers with different pattern respectively using four projections. It will be expected that the this STAM is useful tool in evaluating the object with multilayer structures.
자근으로부터 acetylshikonin의 분리 및 함량분석
황석연,황방연,강삼식,김창민,박정일,배기환,손건호,이승호,장승엽,강신정,노재섭,이경순 영남대학교 약품개발연구소 2001 영남대학교 약품개발연구소 연구업적집 Vol.11 No.-
Lithospermi Radix has been used in traditional medicine for antimicrobial, antiinflammatory, immunostimulating, antitumor and wound-healing activities. For the quality control of this drug, acetylshikonin was isolated from the hexane extract of Lithospermum erythrorhizon(Boraginaceae) and identified by the spectroscopic evidences. A quantitative analysis of acetylshikonin using HPLC method showed that the average contents were 0.084±0.026% in 31 samples collected throughout the various regions of Korea.
Choi Kihwan,Park Jong Eun,Kim Anhye,Hwang Sojung,Bae Jinkun,Shin Tae Gun,Kim Kyuseok 대한응급의학회 2022 Clinical and Experimental Emergency Medicine Vol.9 No.3
Objective Steroids are used in cases of sepsis, especially in patients experiencing septic shock. However, clinical trials to date have reported contradictory results. Different patient endotypes and variations in the type and dose of steroid may be at fault for this discrepancy, and further investigation is warranted. In this paper, we propose a new DEXA-SEPSIS study design. Methods We plan to conduct a multicenter, double-blinded randomized pilot study (DEXA-SEPSIS) investigating the feasibility and safety of early use of dexamethasone in sepsis. Participants will be high-risk septic patients presenting to the emergency department with a systolic blood pressure of <90 mmHg or serum lactate level of >2 mmol/L. Participants will be randomized to the following three groups: control, 0.1 mg/kg of dexamethasone, or 0.2 mg/kg of dexamethasone per day for 1 to 2 days. The primary outcome will be 28-day mortality. Secondary outcomes will include time to septic shock, shock reversal, additional steroid administration, number of ventilator-free days, use of continuous renal-replacement therapy, length of stay in the intensive care unit and/or hospital, delta Sequential Organ Failure Assessment score on days 3 and 7, superinfection, gastrointestinal bleeding, hypernatremia, and hyperglycemia. Discussion The DEXA-SEPSIS study will provide insight regarding the feasibility and safety of early use of dexamethasone in high-risk sepsis. The results could provide data to design a future phase III study.