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이기헌,유재호,김태원,이상준,김신동 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1
Purpose : Intraoperative suprachoroidal hemorrhage is one of the most serious complications. We report a case of suprachoroidal hemorrhage during phacoemulsification surgery, was managed properly. Methods : Suprachoroidal hemorrhage occurred during phacoemulsificaiton in other hospital. The patient was referred to our department immediately after closing the surgical wound. On initial examination, iris and vitreous were prolapsed through surgical wound. Ciliary body was closely place to anterior chamber, and retina was not visible. Results : Prolapased ocular tissue were reduced by emergency operation. We controlled the patient’s intraocular pressure and inflammation. Ultrasonography was repeatedly performed to check the degree of liquefaction of suprachoroidal hemorrhage. After 9 days of suprachoroidal hemorrhage onset, vitrectomy and drainage through sclera was performed. Postoperative state was stable with successful removal of suprachoroidal hemorrhage. After 2 weeks of secondary operation, retinal detachment has occurred on nasal retinal area, so we performed scleral buckling and endolaser photocoagulation. After 6 months, retina was attached well and intraocular pressure was in normal range. Conclusion : In suprachoroidal hemorrhage, drainage of suprachoroidal hemorrhage after liquefaction of thrombi is effective. After successful drainage, postoperative complications may accompany such as retinal detachment or elevation of intraocular pressure. 목적 : 술중 발생하는 맥락막상 출혈은 매우 심각한 합병증이다. 저자는 수정체 유화술 중에 발생한 맥락막상 출혈을 적절히 대처한 증례를 보고하는 바이다. 대상과 방법 : 수정체 유화술 중 발생한 맥락막상강 출혈환자가 수술창을 봉합 후 즉시 본원으로 전원되었다. 초진시 홍채와 유리체가 수술창을 통해 탈출되어 있었으며, 전방을 통해 모양체가 확인되었으나, 망막은 보이지 않았다. 탈출된 안구내 조직을 응급수술을 통해 복원 후 환자의 안압과 염증을 조절하였다. 초음파를 반복적으로 실시하여 맥락막상 출혈의 액화 정도를 확인하였으며, 출혈 9일 후 유리체 절제술과 공막을 통한 배액술을 시행하였다. 결과 : 맥락막상 출혈이 성공적으로 제거되었으며 술 후 상태는 안정적이었다. 수술 2주 후 비측 망막 박리가 발생하여 공막돌륭술과 안구내 삽관 레이저술을 시행하였다. 6개월 후 망막은 잘 붙어있었으며, 안압은 정상 범위를 유지하였다. 결론 : 맥락막상 출혈의 경우 출혈의 배액 시기를 결정하는 것이 어렵지만, 규칙적인 초음파를 통해 배액술의 시기를 결정할 수 있다. 또한 맥락막상강 출혈의 성공적인 배액 이후에도 망막박리 및 안압상승과 같은 합병증의 동반에 대해 유념해야한다.
( Heon-ju Kwon ),( Kyoung Won Kim ),( Bohyun Kim ),( So Yeon Kim ),( Chul Seung Lee ),( Jeongjin Lee ),( Gi Won Song ),( Sung Gyu Lee ) 대한간학회 2018 Clinical and Molecular Hepatology(대한간학회지) Vol.24 No.1
Background/Aims: Computed tomography (CT) hepatic volumetry is currently accepted as the most reliable method for preoperative estimation of graft weight in living donor liver transplantation (LDLT). However, several factors can cause inaccuracies in CT volumetry compared to real graft weight. The purpose of this study was to determine the frequency and degree of resection plane-dependent error in CT volumetry of the right hepatic lobe in LDLT. Methods: Forty-six living liver donors underwent CT before donor surgery and on postoperative day 7. Prospective CT volumetry (V< SUB >P< /SUB >) was measured via the assumptive hepatectomy plane. Retrospective liver volume (V< SUB >R< /SUB >) was measured using the actual plane by comparing preoperative and postoperative CT. Compared with intraoperatively measured weight (W), errors in percentage (%) V< SUB >P< /SUB > and V< SUB >R< /SUB > were evaluated. Plane-dependent error in V< SUB >P< /SUB > was defined as the absolute difference between V< SUB >P< /SUB > and V< SUB >R< /SUB >. % plane-dependent error was defined as follows: |V< SUB >P< /SUB >-V< SUB >R< /SUB >|/W·100. Results: Mean V< SUB >P< /SUB >, V< SUB >R< /SUB >, and W were 761.9 mL, 755.0 mL, and 696.9 g. Mean and % errors in V< SUB >P< /SUB > were 73.3 mL and 10.7%. Mean error and % error in V< SUB >R< /SUB > were 64.4 mL and 9.3%. Mean plane-dependent error in V< SUB >P< /SUB > was 32.4 mL. Mean % planedependent error was 4.7%. Plane-dependent error in V< SUB >P< /SUB > exceeded 10% of W in approximately 10% of the subjects in our study. Conclusions: There was approximately 5% plane-dependent error in liver V< SUB >P< /SUB > on CT volumetry. Plane-dependent error in V< SUB >P< /SUB > exceeded 10% of W in approximately 10% of LDLT donors in our study. This error should be considered, especially when CT volumetry is performed by a less experienced operator who is not well acquainted with the donor hepatectomy plane. (Clin Mol Hepatol 2018;24:54-60)
Gi Yong Lee,Soo In Lee,Ji Heon Park,Sun Do Kim,Geun-Bae Kim,Soo-Jin Yang 대한수의학회 2023 Journal of Veterinary Science Vol.24 No.6
Background: A recent increase in the occurrence of canine skin and soft tissue infections, including otitis externa and pyoderma, caused by antimicrobial-resistant Staphylococcus pseudintermedius and S. schleiferi has become a significant public and veterinary health issues. Objective: We investigated the virulence potentials associated with the occurrence of canine otitis externa in S. pseudintermedius and S. schleiferi. Methods: In this study, the prevalence of genes encoding leukocidins, exfoliative toxins, and staphylococcal enterotoxins (SEs) was investigated using previously characterized S. pseudintermedius (n = 26) and S. schleiferi (n = 19) isolates derived from canine otitis externa. Susceptibility to cathelicidins (K9CATH and PMAP-36) and hydrogen peroxide (H2O2) was also examined in both staphylococcal species. Results: A high prevalence of genes encoding leukocidins (lukS/F-I, lukS1/F1-S, and lukS2/F2-S), exfoliative toxins (siet, expB, and sset), and SEs was identified in both S. pseudintermedius and S. schleiferi isolates. Notably, S. pseudintermedius isolates possessed higher number of SE genes, especially newer SE genes, than S. schleiferi isolates harboring egc clusters. Althoughno significant differences in susceptibility to K9CATH and H2O2 were observed between the two isolate groups, S. pseudintermedius isolates exhibited enhanced resistance to PMAP-36 compared to S. schleiferi isolates. Conclusions: These findings suggest that high a prevalence of various toxin genes together with enhanced resistance to cathelicidins may contribute to the pathogenicity of S. pseudintermedius and S. schleiferi in canine cutaneous infections.
Effects of Saenghyul-dan (SHD) on the Myelosuppression Induced by 5-Fluorouracil
Lee, Gi-Joon,Son, Chang-Gue,Lee, Yeon-Weol,Lee, Nam-Heon,Yun, Dam-Hee,Yoo, Hwa-Seung,Cho, Chong-Kwan,Cho, Jung-Hyo The Society of Korean Medicine 2006 대한한의학회지 Vol.27 No.4
Objective : This study aimed to investigate the effect of SHD on myelosuppression using an animal model for therapeutic evidence supporting clinical positive results. Methods : After determining the optimal concentration of 5-FU as 300 mg/kg for developing the mouse model, ICR mice or BALB/c mice were administered with SHD, and several blood parameters, including hematopoietic cytokines, colony forming activity and histological findings, were examined to evaluate the effects. Results : SHD restored the WBC and hemoglobin, and showed effects on maintaining body weight, producing GM-CSF and IL-3 and stem cell colony forming activity in accordance with histological relative entirety on bone marrow. Conclusion : SHD is an herbal drug having therapeutic effects on myelosuppression. Thus, it could be prescribed to cancer patients undergoing chemo-therapies or radio-therapies in the process of cancer treatment.
AFM Imaging Analysis of Alopecia Areata by Edge Detection
( Gi Ja Lee ),( Hwi Jun Kim ),( Yun Hye Eo ),( Sam Jin Choi ),( Ki Heon Jeong ),( Bark Lynn Lew ),( Woo Young Sim ),( Mu Hyoung Lee ),( Berm Seok Oh ),( Hun Kuk Park ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.1
Alopecia areata(AA) is a common type of autoimmune disorder that produced sudden patch-like hair loss. Owing to the dysfunction of keratogenous zone in affected hair at early anagen, hair shaft with AA had abnormal structure or total disintegration. Typically, it showed characteristic(or unique) broken hair shafts on the hair-less patch. Few techniques were introduced to investigate hair surface. Recently, atomic force microscopy(AFM) became an ideal method for non-invasive examination of hair surface. When the cortical keratinocytes were affected in AA, the topographic changes of hair cuticles could be examined by AFM in nanoscale. In this experiment, we compared the AFM images of hair surface and extracted parameters from the cuticle between control group and patient group with AA(n=12, each). Data demonstrated that the shaft surface of AA patient`s hair was more damaged than that of normal group. Various types of damage such as crack of scale, longitudinal striation, endocuticular ghost and debris were observed on hair cuticles with AA. In order to find cuticle parameters, we performed the edge detection of cuticle with canny mask. The curvature was defined as a secondary differentiation with the x and y coordinates of cuticle edge on AFM images to compare the cuticle edge between two groups. As a result, the cuticle scale parameters showed frequent changes in AA patient groups. In particular, top distance and step height of cuticle in AA group were lower than those of control group and the curvature of cuticle edge in AA patient group was higher than those of healthy one. In conclusion, the cortical keratinocytes might affect the pathogenesis of AA. This is the first comparison study about hair shaft surfaces over the whole lengths between AA and healthy group, to our knowledge.
Gi-Heon Jeong,Hyung-Woo Lee,Tae-Yong Yoon,Hyeon-Jun Park,Kyo-Beum Lee 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.6
This paper proposes a model predictive current control (MPCC) method for a three-leg two-phase voltage source inverter to reduce the ripple of the output current. The proposed MPCC method is based on discrete space vector modulation, which is implemented by eliminating nonlinear modulation regions and generating virtual voltage vectors based on the stationary reference voltage vector axis. In addition, based on a voltage angle estimated using load parameters, the candidate voltage vectors in a specific region are generated, which reduces the calculation burden. Subsequently, the cost function is calculated using these candidate voltage vectors, and the optimal voltage vector selected using the proposed MPCC method is more accurate than the vector selected using the conventional MPCC method. Therefore, by applying the proposed method to increase the number of virtual voltage vectors, it is possible to obtain a delicate reference voltage. Consequently, the total harmonic distortion of the output current is reduced, resulting in an increase in power quality. The effectiveness and feasibility of the proposed method are verified through simulations and experiments.