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권용환 ( Yong Hwan Kwon ),김현진 ( Hyun Jin Kim ) 대한소화기학회 2016 대한소화기학회지 Vol.68 No.3
Irritable bowel syndrome (IBS) is a common functional gastrointestinal disorder. The pathophysiology of IBS is not completely understood. Genetic, immune, environmental, inflammatory, neurological and psychological factors contribute to the risk of this condition. Traditional research explored gastrointestinal motor abnormalities, central neural dysregulation, abnormal psychological features, and visceral hypersensitivity. More recent investigations consider bacterial overgrowth, abnormal serotonin pathways, altered gut flora, immune activation and mucosal inflammation. The purpose of this article is to review recent translational research concerning the pathophysiology, biomarker and genetic factors of IBS and to encourage IBS research in Korea. (Korean J Gastroenterol 2016;68:138-142)
해외유입 말라리아의 진단에서 말라리아 신속항원검사의 유용성
권용환 ( Yong Hwan Kwon ),김석원 ( Seok Won Kim ),박수연 ( Soo Yeon Park ),장동원 ( Dong Won Jang ),정연오 ( Yeon Oh Jeong ),김가연 ( Ga Yeon Kim ),진범식 ( Bum Sik Chin ),신형식 ( Hyoung Shik Shin ) 전북대학교 의과학연구소 2014 全北醫大論文集 Vol.38 No.2
Objectives: Peripheral blood smear is the gold standard for the diagnosis of malaria. However, it is labor-intensive, time consuming, and more importantly, requires skill and experienced microscopists. This study was carried out to evaluate diagnostic performance of rapid diagnostic test (RDT) for detection of imported malaria. Methods: Peripheral blood smears, and RDT on the medical records were analyzed retrospectively for patients with a history of a foreign travel who visited National Medical Center between August 2009 and December 2013. Compared with the peripheral blood smear, the sensitivity and specificity of RDT were evaluated. Results: Among the total of 368 blood samples, the peripheral blood smear diagnosed 42 P. falciparum and 6 non-falciparum infections. The overall sensitivity of RDT was 91.7% (44/48) and the overall specificity of RDT was 94.1% (301/320). The sensitivity for P. falciparum of the RDT was 97.6% (41/42) and it was increased up to 100% (39/39) with the parasite densities of > 50 parasites/μL. Conclusion: Considering rapidity, high sensitivity and specificity, RDT was useful as an adjunctive tool for diagnosis of imported malaria.
권용환(Yong Hwan Kwon),이정동(Jeong Dong Lee),정도철(Do Chul Jung),윤세진(Se Jin Yoon),황영현(Young Hyun Hwang) 한국자원식물학회 2005 한국자원식물학회지 Vol.18 No.3
천마 재배에서 차광방법 개발과 접종목 재활용의 가능성을 검정하여 저 비용, 고 생산의 재배법을 확립하기 위한 실험을 수행하였다. 비가림을 하지 않은 노지재배에서는 종마의 수량이 성마의 수량 보다 높았다. 차광 방법에 따른 천마의 수량은 95% 차광망 1겹, 2겹 및 무차광순 이었으며, 접종목 혼용에 따른 천마의 수량은 생목만 사용하였을 경우에 가장 높았고, 다음으로는 생목과 재활용목을 2:1로 및 1:1 혼용처리 처리 순이었다. 접종목 혼용에 따른 수익성 비교에서 95% 차광막 1겹 처리시 생목과 재생목을 2:1로 혼용한 경우는 생목만 사용한 경우 수익의 81%이었다. 재배법 개선을 통해 수량성을 높일 수 있다면 생목과 재생목을 적당한 비율로 섞어 재배할 경우 비용 절감과 환경보호 차원에서 유용한 방법으로 사료된다. To establish the economical cultivation method of Gastrodia elata Blume by controlling the shading rate and the mixing ratio of recycling spawn bed logs, a serial experiment was carried out. When G. elata was grown in the field with no shading, the yield of spawn tuber was higher than that of tuber of G. elata. The yield of G. elata was high in the rainproof green house covered with one layer of 95% shading net, in the rainproof green house covered with two layers of 95% shading net, and in the field with no shading, in that order. In the case of mixing ratio of recycling spawn bed logs, the yield was high in the fresh logs, in the mixing ratio of 2:1, and the ratio of 1:1, in that order. The income of the rainproof green house covered with one layer of 95% shading net which brought the best yield was 81% in the mixing ratio of 2:1 over the fresh logs.
권용환 ( Yong Hwan Kwon ) 대한내과학회 2021 대한내과학회지 Vol.96 No.1
Helicobacter pylori (H. pylori) is the main cause of most gastroduodenal diseases. Triple therapy including two antibiotics, amoxicillin and clarithromycin, and a proton pump inhibitor given for a week has been recommended as the treatment of choice since the revision of the Korean H. pylori Clinical Practice Guidelines in 2013. However, antimicrobial resistance significantly decreased the cure rate of H. pylori eradication to 63.9%. Thus, the new H. pylori treatment regimen would be needed to increase the eradication rate in Korea. Recently, the update of clinical practice guideline for treatment of H. pylori was developed by conducting a meta-analysis. In this review, the recommended H. pylori eradication regimen in current 2020 guideline will be discussed. (Korean J Med 2021;96:13-21)
Nafamostat나 Gabexate는 내시경 역행성 담췌관 조영술 후 췌장염을 예방할 수 있는가?
권용환 ( Yong Hwan Kwon ),김지연 ( Ji Yeon Kim ),이상직 ( Sang Jik Lee ),장세영 ( Se Young Jang ),박현우 ( Hyun Woo Park ),양해민 ( Hae Min Yang ),정민규 ( Min Kyu Jung ),전성우 ( Seong Woo Jeon ),조창민 ( Chang Min Cho ),탁원영 ( 대한소화기학회 2012 대한소화기학회지 Vol.59 No.3
목적: 내시경 역행성 담췌관 조영술(ERCP)은 담도 및 췌장 질환의 진단 및 치료에 있어 중요한 시술이나, 시술 후 발생하는 합병증 중 췌장염의 빈도를 줄이기 위해 약물학적 예방요법 및 시술 기법 등에 대한 많은 연구가 이루어져왔다. 예방적 약물요법에 있어 많은 약물들이 거론되지만 그 효과에 대해서는 아직 논쟁 중이며, 이번 연구에서는 많은 연구에서 효과가 있다고 알려진 gabexate, nafamostat를 택해 대조군을 통해 그 효과를 비교하였다. 대상 및 방법: 2009년 7월부터 2010년 2월까지 내시경 역행성 담췌관 조영술을 시행한 환자 242명을 대상으로, 단순 검법과 무작위 대조군으로 나누어 내시경 역행성 담췌관 조영술 후 췌장염 발생 여부에 관해 분석하였다. 결과: 내시경 역행성 담췌관 조영술 후 췌장염 발생 빈도는 gabexate군 6.8%, nafamostat군 5.7%, 대조군은 6.2%로, 군에 있어 췌장염의 발생빈도는 차이가 나지 않았다(p=0.486). 내시경 역행성 담췌관 조영술 후 급성 췌장염의 발생빈도에 대해서 성별, 연령 등에서도 의미있는 차이점을 발견하지 하였으나, 시술시 췌유두 괄약근 절개술, 췌관 삽관과 유두부 절제술은 췌담도 조영술 후 췌장염 발생 위험인자로 다시번 확인되었다. 결론: 내시경 역행성 담췌관 조영술 후 급성 췌장염의 발생빈 도를 낮추기 위해 사용된 gabexate 및 nafamostat는 대조군에 비해 유의한 차이가 없었다. Background/Aims: ERCP is the most common procedure for the diagnosis and treatment of bile duct and pancreatic disease, but Post-ERCP pancreatitis makes poor outcome in some cases. The protease inhibitors, nafamostat and gabexate, have been used to prevent pancreatitis related to ERCP, but there is some debate. We tried to evaluate the efficacy of gabexate and nafamostat for the prevention of post-ERCP pancreatitis. Methods: Two hundred forty two patients (73 patients in the gabexate group, 88 patients in the nafamostat group and 81 patients in the placebo group) were included in the study after selective exclusion. The incidence of pancreatitis after ERCP was compared among groups. Results: The incidence of pancreatitis were 6.8% in the gabexate group, 5.7% in the nafamostat group and 6.2% in the placebo group (p=0.954). Conclusions: There was no meaningful difference among the gabexate, nafamostat and placebo group.