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Won, Ki-Bum,Nam, Chang-Wook,Cho, Yun-Kyeong,Yoon, Hyuck-Jun,Park, Hyoung-Seob,Kim, Hyungseop,Han, Seongwook,Hur, Seung-Ho,Kim, Yoon-Nyun,Park, Sang-Hyun,Han, Jung-Kyu,Koo, Bon-Kwon,Kim, Hyo-Soo,Doh, J The Korean Academy of Medical Sciences 2016 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.31 No.12
<P>Data on the clinical outcomes in deferred coronary lesions according to functional severity have been limited. This study evaluated the clinical outcomes of deferred lesions according to fractional flow reserve (FFR) grade using Korean FFR registry data. Among 1,294 patients and 1,628 lesions in Korean FFR registry, 665 patients with 781 deferred lesions were included in this study. All participants were consecutively categorized into 4 groups according to FFR; group 1: ≥ 0.96 (n = 56), group 2: 0.86–0.95 (n = 330), group 3: 0.81–0.85 (n = 170), and group 4: ≤ 0.80 (n = 99). Primary endpoint was major adverse cardiac events (MACE), a composite of all-cause death, myocardial infarction, and target vessel revascularization. The median follow-up period was 2.1 years. During follow-up, the incidence of MACE in groups 1–4 was 1.8%, 7.6%, 8.8%, and 13.1%, respectively. Compared to group 1, the cumulative rate by Kaplan-Meier analysis of MACE was not different for groups 2 and 3. However, group 4 had higher cumulative rate of MACE compared to group 1 (log-rank <I>P</I> = 0.013). In the multivariate Cox hazard models, only FFR (hazard ratio [HR], 0.95; <I>P</I> = 0.005) was independently associated with MACE among all participants. In contrast, previous history of percutaneous coronary intervention (HR, 2.37; <I>P</I> = 0.023) and diagnosis of acute coronary syndrome (ACS) (HR, 2.35; <I>P</I> = 0.015), but not FFR, were independent predictors for MACE in subjects with non-ischemic (FFR ≥ 0.81) deferred coronary lesions. Compared to subjects with ischemic deferred lesions, clinical outcomes in subjects with non-ischemic deferred lesions according to functional severity are favorable. However, longer-term follow-up may be necessary.</P>
박효진 ( Hyo Jin Park ),최규완 ( Kyoo Wan Choi ),백승운 ( Seung Woon Paik ),이준행 ( Jun Haeng Lee ),고광철 ( Kwang Cheol Koh ),이풍렬 ( Poong Lyul Rhee ),이종철 ( Jong Chul Rhee ),정훈용 ( Hwoon Yong Jung ),김재준 ( Jae J . Ki 대한소화기학회 2001 대한소화기학회지 Vol.38 No.4
Background/Aims: Two different methods of colon transit time studies (4-day method and 7-day method) are commonly used in Korea. The aim of this study was to define the normal values and to compare the clinical usefulness of the two methods. Methods: Seventy-five healthy volunteers and 101 patients with chronic constipation were enrolled in this study. Radio-opaque markers were given for 3 days and simple abdominal radiographs were obtained on the 4th and 7th days. Colon transit times estimated by only 4th-day film (CTT-4) and by both 4th and 7th-day films (CTT-7) were compared. Results: The upper limits of normal volunteers without constipation were 56 hours in CTT-4 and 61 hours in CTT-7. In selecting constipated patients with delayed transit, the results of both methods were comparable (kappa=0.823, p<0.01). However, the 4-day method could not differentiate patients with severely delayed transit from patients with mildly delayed transit. Conclusions: Four-day method is useful in selecting constipated patients with delayed transit but it does not give relevant information on the severity of delayed transit. Seven-day method can be used in selecting patients with severely delayed transit. (Korean J Gastroenterol 2001;38:241-246)
Improving Accuracy and Reliability of Hearing Tests: An Exploration of International Standards
Suh Michelle J.,Lee Jihyun,Cho Wan-Ho,Jin In-Ki,Kong Tae Hoon,Oh Soo Hee,Lee Hyo-Jeong,Choi Seong Jun,Cha Dongchul,Park Kyung-Ho,Seo Young Jun 대한청각학회 2023 Journal of Audiology & Otology Vol.27 No.4
his study explores the internal standards for hearing tests and benefits of implementing international standard protocols, including the International Organization for Standardization (ISTO) and International Electrotechnical Commission (IEC), and discusses how ISO and IEC standards provide a framework for designing, calibrating, assessing hearing test instruments and methods, and exchanging and comparing data globally. ISO and IEC standards for hearing tests improve accuracy, reliability, and consistency of test results by applying standardized methods and environments. Moreover, they promote international harmonization and data interoperability, enabling information exchange and research collaboration. Those standards for hearing tests are beneficial but have challenges and limitations, such as variation in equipment and calibration, lag in updating standards, variation in implementation and compliance, and lack of coverage of clinical aspects, cultural diversity, and linguistic diversity. These affect the quality and interpretation of test results. Adapting ISO or IEC standards locally would improve their applicability and acceptability, while balancing customization and compatibility with global standards.
Jin In-Ki,Lee Donghyeok,Jeong Youngchan,Seo Young Jun,Kong Tae Hoon,Suh Michelle J.,Cho Wan-Ho,Lee Hyo-Jeong,Choi Seong Jun,Cha Dongchul,Park Kyung-Ho,Oh Soo Hee 대한청각학회 2024 Journal of Audiology & Otology Vol.28 No.1
Hearing thresholds provide essential information and references about the human auditory system. This study aimed to identify changing trends in distributions of hearing threshold levels across ages by comparing the International Organization for Standardization (ISO) 7029 and newly available data after publishing ISO 7029. To compare ISO 7029 and newly available hearing threshold data after publishing ISO 7029, four country-specific datasets that presented average hearing threshold levels under conditions similar to ISO 7029 were utilized. For frequencies between 125 Hz and 8,000 Hz, the deviations of hearing threshold values by ages from the hearing threshold of the youngest age group for each data point were utilized. For frequencies from 9,000 Hz to 12,500 Hz, the median threshold information was utilized. Hearing threshold data reported after publishing ISO 7029 from the four countries were mostly similar to the ISO 7029 data but tended to deviate in some age groups and sexes. As national hearing threshold trends change, the following ISO 7029 revision suggests the need to integrate hearing threshold data from different countries.
α-Rhamnosidase inhibitory activities of polyhydroxylated pyrrolidine
Kim, Jin-Hyo,Marcus J. Curtis-Long,Seo, Woo-Duck,Lee, Jin-Hwan,Lee, Byong-Won,Yoon, Yong-Jin,Kang, Kyu-Young,Park, Ki-Hun Plant molecular biology and biotechnology research 2005 Plant molecular biology and biotechnology research Vol.2005 No.
We designed and synthesized polyhydroxylated pyrrolidines 1-12 from L-tyrosine, L-phenylalanine, and D-tyrosine through iodine-mediated intramolecular cyclization followed by Woodward-Prevost reaction. The synthetic polyhydroxylated pyrrolidines were identified with structure-based inhibitory activity and selective inhibitory activity against α-rhamnosidase. (2S,3S,4R)-deacetyl anisomycin 7 was the best inhibitor among the 12 polyhydroxylated pyrrolidines because it possesses the same stereoconfiguration a1 C1, C2, C3 as α-L-rhamnopyranoside. An investigation into the nature of the inhibition showed that the synthetic pyrrolidines are competitive inhibitors. They also did not have remarkable inhibitory activity against seven glycosidases (χ-glucosidase, α-mannosidase, χ-amylase, β-glucosidase, β-galactosidase, β-amylase, and invertase).
Chae, Sudong,Siddiqa, Akhtar J.,Kim, Bum Jun,Oh, Seungbae,Choi, Kyung Hwan,Kim, Hyo Yeol,Lee, Keun Ho,Yu, Hak Ki,Choi, Jae-Young The Royal Society of Chemistry 2018 Chemical communications Vol.54 No.86
<P>We studied dispersants for exfoliating bulk V2Se9 into one dimensional chain units. V2Se9, with a negative zeta potential of −30.1 mV, was acidic and strongly anchored with the amine head of octadecylamine by charge transfer reaction. The steric hindrance by the octadecyl tail promoted the dispersion of V2Se9 to the nano level.</P>
Obstetrical outcomes of amniocentesis or chorionic villus sampling in dichorionic twin pregnancies
( Eunhee Ahn ),( Bohye Kim ),( Hyo J. Ki ),( Sukho Kang ),( Sung W. Chang ),( Sang H. Jung ),( Myoung J. Moon ),( Mi S. Kim ),( Soobin Lee ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: This study aimed to evaluate the procedure-related fetal loss and the obstetrical outcomes of chorionic villus sampling and amniocentesis in twin pregnancies. Methods: The data from dichorionicdiamniotic twin pregnancies for which first-trimester chorionic villus sampling or second-trimester amniocentesis was performed between December 2006 and January 2017 at a single institute, were retrospectively analyzed. The groups were compared with respect to the procedure-related and obstetrical outcomes. Results: The difference in procedure-related fetal loss rate (1.9% for chorionic villus sampling vs. 1.8% for amniocentesis; P=1.000) and overall fetal loss rate (7.4% for chorionic villus sampling vs. 4.7% for amniocentesis; P=0.489) between the two groups was not significant. The difference in miscarriage rate and early preterm delivery were not significant between the groups (miscarriage: 5.6% for chorionic villus sampling vs. 0.6% for amniocentesis; early preterm delivery: 11.1% for chorionic villus sampling vs. 10.6% foramniocentesis; P=NS). The differences in mean gestational ages at delivery, birth weights, and neonatal intensive care unit admission rate were not statistically significant. Conclusion: To our knowledge, this is one of the few studies to compare chorionic villus sampling and amniocentesis in twin pregnancy, including procedure-related fetal loss. The procedure-related fetal loss and the overall fetal loss of chorionic villus sampling appear comparable to those of amniocentesis. Both procedures can be safely used based on several factors: indications, gestational age, technical difficulties, the likelihood to proceed to selective feticide, and operators experience. These findings can be useful for clinicians when counseling parents of twins regarding their options for antenatal aneuploidy, genetic diagnosis, and the associated risks. Furthermore, randomized controlled trials are required to compare the safety of chorionic villus sampling and amniocentesis in twin pregnancies.