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Lee, Seungmin,Kim, Sang Yoon,Lee, Jee Young,Choi, Min Jeong Korean Society of Magnetic Resonance in Medicine 2016 Investigative Magnetic Resonance Imaging Vol.20 No.3
Carbon monoxide (CO) intoxication is a leading cause of the variable neuropsychiatric impairment. Despite of widely known central nerve system complications after CO intoxication, peripheral neuropathy due to CO poisoning is rare and has been under-recognized. We report interesting case of a 29-year-old male who suffered from motor weakness and sensory abnormalities in his lower extremity following acute CO intoxication. The patient revealed direct and indirect signs of peripheral neuropathy of the left inferior gluteal and sciatic nerve on magnetic resonance imaging.
Suh, Heongwon,Jee, Hyeonseok,Kim, Jihoon,Kitagaki, Ryoma,Ohki, Shinobu,Woo, Seungmin,Jeong, Keunhong,Bae, Sungchul Elsevier 2020 Construction and Building Materials Vol.235 No.-
<P><B>Abstract</B></P> <P>This study investigates the effects of rehydration conditions (different hydration durations at 20 °C/60% relative humidity (RH) and in water) on the mechanical and atomic structural recovery of cement paste heated to temperatures of 200, 500, 800, and 1000 °C. Variations in the mass, bulk density, compressive strength, and surface morphology of the paste due to heating and rehydration were characterized. In addition, variations in the hydration products and the mean chain length (MCL) of calcium silicate hydrates (C-S-H) in the pastes due to heating and rehydration were analyzed using X-ray diffraction and <SUP>29</SUP>Si solid-state nuclear magnetic resonance spectroscopy (<SUP>29</SUP>Si NMR), respectively. The compressive strength of the cement paste heated up to 500 °C recovered much more when the paste was placed in water while hot and water-rehydrated for 24 h than when it was rehydrated at 20 °C/60% RH. This mechanical recovery could be induced by accelerated hydration, which results in the formation and enhanced silicate polymerization of C-S-H. <SUP>29</SUP>Si NMR analysis further indicated that the mechanical recovery of cement paste was correlated linearly with the increase in the MCL of C-S-H. In contrast, no mechanical recovery was observed in the cement pastes heated at 800 °C and 1000 °C after rehydration due to the decomposition of C-S-H.</P> <P><B>Highlights:</B></P> <P> <UL> <LI> Effects of rehydration on the mechanical recovery of heated OPC pastes were studied. </LI> <LI> Rehydrating in water while hot recovered the OPC paste after heating up to 500 °C. </LI> <LI> The mechanical recovery of OPC pastes was linearly correlated with MCL of C-S-H. </LI> </UL> </P>
한국인에서의 직선형 전향적 상완골 골수 내 금속정의 해부학적 적합성 분석
최성(Sung Choi),지승민(Seungmin Jee),황성문(Seongmun Hwang),신동주(Dongju Shin) 대한정형외과학회 2021 대한정형외과학회지 Vol.56 No.6
목적: 컴퓨터 단층 촬영 영상을 이용하여 한국인에서 상완골 근위부 골절 치료에 적용되는 직선형 전향적 상완골 골수 내 금속정의 이상적 삽입점 위치를 알아보고 해부학적 적합성을 분석하고자 한다. 대상 및 방법: 2014년 5월부터 2016년 10월까지 견관절 외상으로 컴퓨터 단층 촬영을 시행한 환자 중 건측 견관절을 동시에 촬영한 한국인 74예를 대상으로 하였으며, 평균 나이는 64.5세(범위, 22–95세)였다. 영상의학적 평가는 건측 근위 상완골의 컴퓨터 단층 촬영 영상을 이용하여 다면 재구성(multiplanar reconstruction) 기법을 이용하였다. 직선형 골수정의 이상적 삽입점은 상완골 골수강 내 중심축과 상완골두가 만나는 점으로 선정하였으며 삽입점과 국소 해부학적 위치와의 거리를 측정하였다. 삽입점에서 극상건 부착부의 가장 내측까지의 관상면상 거리를 임계거리(critical distance)로 정의하고 이를 이용하여 삽입점과 회전근개 부착부와의 근접성을 평가하였다. 회전근개의 손상을 피하고 충분한 고정력을 얻기 위한 임계거리는 Euler 등이 제시한 대로 8mm 이상 확보 되어야 하며, 8 mm 미만인 경우를 위험형(critical type)으로 정의하였다. 임계거리와 성별, 나이, 키, 몸무게, 신체 용적지수(body mass index)와의 통계적 유의성을 확인하였다. 결과: 이 연구에서 이상적인 삽입점의 위치는 이두구 외측연에서 시상면상 거리인 전후 거리는 평균 11.5 mm (범위, 4.0–16.6), 대결절의 가장 외측연에서 관상면상 거리인 내외 거리는 평균 20.5 mm (범위, 16.3–27.4)였다. 이상적 삽입점에서 극상건 부착부의 가장 내측까지의 관상면상 거리인 임계거리는 평균 8.0 mm (범위, 4.1–16.6)이며, 임계거리가 8 mm 미만인 위험형(critical type)ㅏ이은 74예 중 41예(55.4%)였다. 결론: 한국인에서 직선형 전향적 상완골 골수 내 금속정의 사용시, 상완 이두구의 외측연에서 후방으로 11.5 mm, 대결절 외측연에서 내측으로 20.5 mm 지점이 평균적인 이상적 삽입점의 위치였다. 하지만 55.4%의 경우에서 이상적 삽입점의 위치로 삽입할 경우 회전근개의 손상을 줄 수 있는 위험형(critical type)이였으므로, 술 전 치료방법의 선택 과정에서 환자 개개인의 해부학적 특성을 충분히 고려하여야 한다. Purpose: The aim of this study were to find ideal entry point of straight antegrade humeral intramedullary nail (SAHN) for the treatment of proximal humerus fracture in Korean and to analyze anatomical conformity using computed tomography. Materials and Methods: From May 2014 to October 2016, the study was conducted retrospectively on 74 Korean patients who had taken computed tomography on both normal and affected shoulder joint as result of shoulder injury. The mean age of the patients was 64.5 years (range, 22–95 years). Radiologic evaluation was done using multiplanar reconstruction technique of the computer tomography on normal proximal humerus. We located ideal entry point of SAHN as the point where humerus intramedullary center axis and humeral head meet. Distance between the entry point and local anatomical landmark was measured. We defined the critical distance as the distance between entry point and the most medial point of the supraspinatus attachment site. For adequate fixation and avoidance of injury to rotator cuff, critical distance should be over 8 mm according to Euler, and we defined the critical type when it is less than 8 mm. Critical distance, sex, age, height, body weight, body mass index was evaluated for the statistical significance. Results: The ideal entry point was as follows: the mean anteroposterior distance, the sagittal distance to the lateral margin of bicipital groove, was 11.5 mm and the mean mediolateral distance, the coronal distance to the lateral margin of grater tuberosity, was 20.5 mm. The mean critical distance, distance from the entry point to the just medial to insertion of the supraspinatus tendon, was 8.0 mm. Critical type with critical distance less than 8 mm was found in 41 in 74 patients (55.4%). Conclusion: The ideal entry point of SAHN in Korean was located on 11.5 mm posteriorly from the lateral margin of bicipital groove and 20.5 mm medially from lateral margin of greater tuberosity. More than half of the cases were critical type. Since critical type can possibly cause rotate cuff injury during nail insertion on entry point, surgeon should consider anatomical variance before choosing surgical option.
Vitamin D Levels in Patients with Low-energy Hip Fractures
Jaehwi Han,조영호,Seungmin Jee,Seongwoo Jo 대한고관절학회 2020 Hip and Pelvis Vol.32 No.4
Purpose: To evaluate serum 25(OH) vitamin D levels in patients with low-energy hip fractures. Materials and Methods: Among 983 patients who underwent hip fracture surgery between August 2013 and March 2019, 732 patients were evaluated. The remaining patients were excluded due to the presence of one or more of the following: metastatic bone tumor, metabolic bone disease other than osteoporosis, fracture due to high-energy injury, atypical femoral fracture, and no blood test. We collected patient’s data about age, sex male female, date of injury, a place of residence, fracture type, preinjury ambulation ability according to their Koval score, and their serum level of 25(OH) vitamin D. The mean age was 79.3 years (60-104 years). The sample was comprised of 530 female and 202 male, of which 342 had femoral neck fractures and 390 had trochanteric fractures. Results: Of the total 732 patients, 346 patients (47.3%) had a 25(OH) vitamin D level of less than 10 ng/mL, 264 patients (36.1%) had scores of 10-19.9 ng/mL, 87 patients (11.9%) had scores of 20-29.9 ng/mL, and 35 patients (4.8%) had a level higher than 30 ng/mL. Vitamin D deficiency (less than 20 ng/mL) was present in 610 patients (83.3%), insufficiency (20-29.9 ng/mL) was found in 87 patients (11.9%), and 35 patients (4.8%) had normal vitamin D levels. The differences in vitamin D concentration based on season and fracture type were statistically significant. Conclusion: Vitamin D deficiency and inadequacy were high in patients with low-energy hip fractures, with only 4.9% of patients had normal vitamin D levels. These findings suggest that efforts should be made to maintain proper vitamin D concentration.
김문구(MoonKoo Kim),박종현(JongHyun Park),이승민(Seungmin, Lee),하영욱(Young Woo Ha),최문정(Moonjung Choi),지수영(Sooyoung Chi),임현(Yim, Hyun),오지선(Jee-Sun Oh) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
디지털 기술의 발전에 따라 디지털 역기능 역시 다양한 양상으로 전개되어 개인의 삶과 사회적 행태에 커다란 영향을 미칠 것으로 전망된다. 이에 본 연구에서는 2030년 미래 디지털 역기능을 전망하고 인공지능, 메타버스, 블록체인, 지능형 로봇으로 선정된 대표디지털 기술이 세부 역기능에 미치는 영향을 분석하고자 하였다. 국내 디지털 기술 관련 전문가에 대해 심층 온라인 조사를 분석한 결과, 현재에 비해 미래 사회에서 디지털 역기능은 심각히 전개되고 이에 따른 사회적·경제적 부담이 상당할 것으로 전망되었다. 디지털 역기능의 세부 항목들은 그 속성에 따라 미래 심각성 정도가 달랐으며 디지털 기술의 특성이 반영되어 세부 디지털 역기능에서 다르게 발현될 것으로 나타났다. 조사결과를 바탕으로 디지털 역기능에 선제적으로 대응하기 위한 방향을 제언하였다.