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Yoon SJ, Bak J, Yoo B. Rheological and tribological properties of native potato starch agglomerated by fluidized bed granulator. Int J Biol Macromol 2024; 264:130600. [PMID: 38442829 DOI: 10.1016/j.ijbiomac.2024.130600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 02/29/2024] [Accepted: 03/01/2024] [Indexed: 03/07/2024]
Abstract
We explored the rheological and tribological properties of potato starch agglomerated with a sugar binder (maltodextrin or lactose) at various concentrations by using a fluidized bed granulator. The magnitudes of consistency index and apparent viscosity of agglomerated potato starch (APS) decreased as the binder concentration was increased. Moreover, APS with a sugar binder showed lower viscoelastic moduli and higher tan δ values compared to APS with water as the binder (the control). The gel strength of all agglomerates decreased as the sugar concentration was increased. All samples showed anti-thixotropic behavior, and especially, APS with 20 % lactose showed a small anti-thixotropic area. Utilizing the Arrhenius equation clearly elucidated the effect of temperature on the apparent viscosity of all the samples. Although the maltodextrin concentration had little influence on the activation energy of APS, it increased as the lactose concentration was increased. APS samples with a sugar binder showed greater friction coefficient values compared to the control, with maltodextrin having a significant impact. The findings indicate that the rheological and tribological properties of APS rely on the type and concentration of sugar binder.
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Affiliation(s)
- S J Yoon
- Department of Food Science and Biotechnology, Dongguk University-Seoul, Goyang, Gyeonggi 10326, Republic of Korea
| | - J Bak
- Department of Food Science and Biotechnology, Dongguk University-Seoul, Goyang, Gyeonggi 10326, Republic of Korea.
| | - B Yoo
- Department of Food Science and Biotechnology, Dongguk University-Seoul, Goyang, Gyeonggi 10326, Republic of Korea.
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Lee H, Kim H, Oh S, Park JK, Jang JY, Chun KH, Yoon SJ. Delayed blood pressure recovery after exercise stress test is associated with autonomic dysfunction and pulse pressure in a middle-aged healthy group. PLoS One 2023; 18:e0285961. [PMID: 37788242 PMCID: PMC10547162 DOI: 10.1371/journal.pone.0285961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 09/15/2023] [Indexed: 10/05/2023] Open
Abstract
BACKGROUND Delayed heart rate (HR) and blood pressure recovery after exercise test is known as the reliable indexes of autonomic dysfunction. Here we tried to evaluate the serial changes in various indicators during exercise test and correlations with recovery of HR and blood pressure in a normotensive healthy middle-aged group. METHODS A total of 122 patients without hypertension or diabetes was enrolled (mean age, 55.6 ± 11.0; male, 56.6%; mean blood pressure, 124.8 ± 16.6 / 81.5 ± 9.6 mmHg). Treadmill test was performed for evaluation of chest pain. Patients with coronary artery disease, positive treadmill test result, left ventricular dysfunction or renal failure were excluded. Heart rate recovery was calculated by subtracting the HR in the first or second minute of recovery period from the HR of peak exercise (HRR1 or HRR2). Systolic blood pressure in the 4th minute of recovery stage (SBPR4) was used to show delayed blood pressure recovery. RESULTS Metabolic equivalents (METs) and HR in stage 2 to 4 were significantly correlated with both HRR1 and HRR2. Multiple regression analysis of HRR revealed significant correlation of METs and SBPR4. SBPR4 was significantly correlated with both HRR1 and HRR2 (HRR1, r = -0.376, p<0.001; HRR2, r = -0.244, p = 0.008) as well as SBP in the baseline to stage 3 and pulse pressure (r = 0.406, p<0.001). CONCLUSIONS Delayed BP recovery after peak exercise test revealed significant association with autonomic dysfunction and increased pulse pressure in normotensive middle-aged healthy group. It can be a simple and useful marker of autonomic dysfunction and arterial stiffness.
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Affiliation(s)
- Hancheol Lee
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
| | - Hyeongsoo Kim
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
| | - Seungjin Oh
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
| | - Jong-Kwan Park
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
| | - Ji-Yong Jang
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
| | - Kyeong-Hyeon Chun
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
| | - Se-Jung Yoon
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
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Yoon SJ, Park S, Choi EY, Seo HS, Shim CY, Ahn CM, Kim SA, Ha JW. Left Atrial Velocity Vector Imaging Can Assess Early Diastolic Dysfunction in Left Ventricular Hypertrophy and Hypertrophic Cardiomyopathy. J Cardiovasc Imaging 2023; 31:41-48. [PMID: 36693344 PMCID: PMC9880349 DOI: 10.4250/jcvi.2022.0064] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 08/07/2022] [Accepted: 09/05/2022] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND The function of left atrium (LA) is difficult to assess because of its ventricle-dependent, dynamic movement. The aim of this study was to assess LA function using velocity vector imaging (VVI) and compare LA function in patients with hypertrophic cardiomyopathy (HCMP) and left ventricular hypertrophy (LVH) with normal controls. METHODS Fourteen patients with HCMP (72% male, mean age of 52.6 ± 9.8), 15 hypertensive patients with LVH (88% male, mean age of 54.0 ± 15.3), and 10 age-matched controls (83% male, mean age of 50.0 ± 4.6) were prospectively studied. Echocardiographic images of the LA were analyzed with VVI, and strain rate (SR) was compared among the 3 groups. RESULTS The e' velocity (7.7 ± 1.1; 5.1 ± 0.8; 4.5 ± 1.3 cm/sec, p = 0.013), E/e' (6.8 ± 1.6; 12.4 ± 3.3; 14.7 ± 4.2, p = 0.035), and late diastolic SR at mid LA (-1.65 ± 0.51; -0.97 ± 0.55; -0.82 ± 0.32, p = 0.002) were significantly different among the groups (normal; LVH; HCMP, respectively). The e' velocity, E/e', and late diastolic SR at mid LA were significantly different between normal and LVH (p = 0.001; 0.022; 0.018), whereas LA size was similar between normal and LVH (p = 0.592). The mean late diastolic peak SR of mid LA was significantly correlated with indices of diastolic function (E/e', e', and LA size). CONCLUSIONS The SR is a useful tool for detailed evaluation of LA function, especially early dysfunction of LA in groups with normal LA size.
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Affiliation(s)
- Se-Jung Yoon
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Sungha Park
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Eui-Young Choi
- Division of Cardiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Hye-Sun Seo
- Division of Cardiology, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Chi Young Shim
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Chul Min Ahn
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Sung-Ai Kim
- Division of Cardiology, Hallym University Medical Center, Pyungchon, Korea
| | - Jong-Won Ha
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea
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Choi YJ, Son JW, Kim EK, Kim IC, Kim HY, Seo JS, Sun BJ, Shim CY, Yoon SJ, Lee S, Lee SH, Park JB, Kang DH. Epidemiologic Profile of Patients With Valvular Heart Disease in Korea: A Nationwide Hospital-Based Registry Study. J Cardiovasc Imaging 2023; 31:51-61. [PMID: 36693346 PMCID: PMC9880350 DOI: 10.4250/jcvi.2022.0076] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 08/23/2022] [Accepted: 09/13/2022] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Valvular heart disease (VHD) is a common cause of cardiovascular morbidity and mortality worldwide; however, its epidemiological profile in Korea requires elucidation. METHODS In this nationwide retrospective cohort study from the Korean valve survey, which collected clinical and echocardiographic data on VHD from 45 medical centers, we identified 4,089 patients with VHD between September and October 2019. RESULTS The aortic valve was the most commonly affected valve (n = 1,956 [47.8%]), followed by the mitral valve (n = 1,598 [39.1%]) and tricuspid valve (n = 1,172 [28.6%]). There were 1,188 cases of aortic stenosis (AS) and 926 cases of aortic regurgitation. The most common etiology of AS was degenerative disease (78.9%). The proportion of AS increased with age and accounted for the largest proportion of VHD in patients aged 80-89 years. There were 1,384 cases of mitral regurgitation (MR) and 244 cases of mitral stenosis (MS). The most common etiologies for primary and secondary MR were degenerative disease (44.3%) and non-ischemic heart disease (63.0%), respectively, whereas rheumatic disease (74.6%) was the predominant cause of MS. There were 1,172 tricuspid regurgitation (TR) cases, of which 46.9% were isolated and 53.1% were associated with other valvular diseases, most commonly with MR. The most common type of TR was secondary (90.2%), while primary accounted for 6.1%. CONCLUSIONS This report demonstrates the current epidemiological status of VHD in Korea. The results of this study can be used as fundamental data for developing Korean guidelines for VHD.
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Affiliation(s)
- You-Jung Choi
- Division of Cardiology, Department of Internal Medicine, Korea University Guro Hospital, Korea University, Seoul, Korea
| | - Jung-Woo Son
- Division of Cardiology, Department of Internal Medicine, Yonsei University, Wonju College of Medicine, Wonju, Korea
| | - Eun Kyoung Kim
- Division of Cardiology, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - In-Cheol Kim
- Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea
| | - Hyung Yoon Kim
- Department of Cardiovascular Medicine, Chonnam National University Medical School and Hospital, Gwangju, Korea
| | - Jeong-Sook Seo
- Division of Cardiology, Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University, Busan, Korea
| | - Byung Joo Sun
- Division of Cardiology, Department of Internal Medicine, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea
| | - Chi Young Shim
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Se-Jung Yoon
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Sahmin Lee
- Division of Cardiology, Heart Institute, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Sun Hwa Lee
- Division of Cardiology, Department of Internal Medicine, Jeonbuk National University Hospital, Jeonbuk National University Medical School, Jeonju, Korea
| | - Jun-Bean Park
- Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - Duk-Hyun Kang
- Division of Cardiology, Heart Institute, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Jung YS, Kim YE, Ock M, Yoon SJ. The gaps in health-adjusted life Expectancy (HALE) by income and region in Korea. Eur J Public Health 2022. [DOI: 10.1093/eurpub/ckac131.531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
This study aims to calculate the health-adjusted life expectancy (HALE) by using years lived with disability (YLD) from the national claims data, as well as to identify the differences and inequalities in sex, income level and region. The study was carried out on total population receiving national health insurance and medical benefits. We calculated incidence-based YLD for 260 disease groups, and used it as the number of healthy years lost to calculate HALE. We adopted the insurance premium to calculate the income as a proxy indicator. For the region classification, we chose 250 Korean municipal-level administrative districts. The primary outcome was HALE in the Korean population. The second outcome was the HALE’s gap in terms of sex, income, and region. Our results revealed that HALE increased from 2008 (68.89 years) to 2019 (70.58 years). HALE in males increased faster than that in females. HALE was higher in higher income levels. In 2019, the gap in HALE between Q1 and Q2, the lower income group, was about 5.70 years. The gap in females by income level was smaller than that in males. Moreover, the gap in HALE by region was found to increase. Results suggest that there is an inequality in YLD in terms of income level in Korea. Therefore, we need intensive management for the low-income group to increase HALE at the national level.
Key messages
• Males’ health level may be more sensitive to the socioeconomic level than females’ health level.
• In the 5th National Health Plan (HP2030), it was decided to set a target value for the overall goals based on this result.
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Affiliation(s)
- YS Jung
- Institute for Future Public Health, Korea University , Seoul, South Korea
| | - YE Kim
- Department of Big Data Strategy, National Health Insurance Service , Wonju, South Korea
| | - M Ock
- Department of Preventive Medicine, University of Ulsan College of Medicine , Ulsan, South Korea
| | - SJ Yoon
- Department of Preventive Medicine, Korea University College of Medicine , Seoul, South Korea
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Park JK, Ryu SJ, Lee H, Jang JY, Chun KH, Kim H, Oh S, Yoon SJ. A Broken Railway: A Subclavian Arterial Stent Fracture. Korean Circ J 2022; 52:395-397. [PMID: 35502569 PMCID: PMC9064701 DOI: 10.4070/kcj.2021.0339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 02/18/2022] [Accepted: 03/10/2022] [Indexed: 11/11/2022] Open
Affiliation(s)
- Jong-Kwan Park
- Division of Cardiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea
| | - Seok Jong Ryu
- Division of Radiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea
| | - Hancheol Lee
- Division of Cardiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea
| | - Ji-Yong Jang
- Division of Cardiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea
| | - Kyeong-Hyeon Chun
- Division of Cardiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea
| | - Hyeongsoo Kim
- Division of Cardiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea
| | - Seungjin Oh
- Division of Cardiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea
| | - Se-Jung Yoon
- Division of Cardiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea
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Yoon SJ. Evaluation of LA Dynamics: a Classical Yet Still Challenging Topic until Now. J Cardiovasc Imaging 2022; 30:47-49. [PMID: 35086169 PMCID: PMC8792720 DOI: 10.4250/jcvi.2021.0109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 07/08/2021] [Indexed: 11/24/2022] Open
Affiliation(s)
- Se-Jung Yoon
- Division of Cardiology, NHIS Ilsan Hospital, Goyang, Korea.
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Jang JY, Lee H, Park JK, Yoon SJ. Countless uninvited guests in left atrium. Eur Heart J Case Rep 2020; 4:1-2. [PMID: 33634227 PMCID: PMC7891288 DOI: 10.1093/ehjcr/ytaa423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/17/2020] [Accepted: 10/12/2020] [Indexed: 11/14/2022]
Affiliation(s)
- Ji-Yong Jang
- Division of Cardiology, Ilsan Hospital, National Health Insurance Service, Baeksuk 1 dong 1232 Ilsandong-ku, Goyang, Kyungido 410-719, Republic of Korea
| | - Hancheol Lee
- Division of Cardiology, Ilsan Hospital, National Health Insurance Service, Baeksuk 1 dong 1232 Ilsandong-ku, Goyang, Kyungido 410-719, Republic of Korea
| | - Jong-Kwan Park
- Division of Cardiology, Ilsan Hospital, National Health Insurance Service, Baeksuk 1 dong 1232 Ilsandong-ku, Goyang, Kyungido 410-719, Republic of Korea
| | - Se-Jung Yoon
- Division of Cardiology, Ilsan Hospital, National Health Insurance Service, Baeksuk 1 dong 1232 Ilsandong-ku, Goyang, Kyungido 410-719, Republic of Korea
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Yoon SJ, Kim YE, Park H, Oh IH, Jo MW, Ock M, Go DS, Kim KA, Kim K. Conducting a national burden of disease study in South Korea: from past to present. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa165.264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
South Korea has been measuring its own burden of disease since the early 2000s and has developed a methodology for its calculation. Since 2012, South Korea has been carrying out disease burden research through the Research and Development Project, supported by the Ministry of Health and Welfare. Because the Korean health insurance system covers the entire population of the country, the Korean National Burden of Disease (KNBD) study is based on individual claims data. Disease prevalence, incidence, and mortality rates, which are the epidemiologic indicators used to calculate burden of disease, are based on actual data, and the incidence-based approach is used for Years Lived with disability (YLD), Years of Life Lost (YLL), and Disability Adjusted Life Year (DALY). The KNBD study is conducted for 260 diseases and injuries and subdivided into sub-national levels. Disability weights (DW) are calculated to reflect the sociocultural characteristics of a disease. For cause-specific DWs, we conducted a self-administered web-based survey for medical doctors and students. Using a ranking method, we calculated cause-specific DWs. For this reason, KNBD study results cannot be directly compared with GBD results.
The major findings of the KNBD study are as follows. In Korea, the DALY rate (per 100,000 people) steadily increased for all income levels. The higher the income, the lower the burden of disease; low-income people had a higher burden of disease than high-income people. However, thyroid cancer, refraction and accommodation disorders had a high burden of disease in the high-income group. Growth in the YLD rate was faster than in the YLL rate. In 2016 the leading causes of disease burden were diabetes mellitus, low back pain, and chronic obstructive pulmonary disease.
We will present South Korea's disease burden calculation methodology and its results and share the efforts to calculate disease burden in other countries.
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Affiliation(s)
- S J Yoon
- Korea University Graduate School of Public Health, Seoul, South Korea
- Department of Preventive Medicine, Korea University College of Medicine, Seoul, South Korea
| | - Y E Kim
- Department of Preventive Medicine, Korea University College of Medicine, Seoul, South Korea
| | - H Park
- Department of Preventive Medicine, Ewha Womans University School of Medicine, Seoul, South Korea
| | - I H Oh
- Department of Preventive Medicine, School of Medicine, Kyung Hee University, Seoul, South Korea
| | - M W Jo
- Department of Preventive Medicine, University of Ulsan College of Medicine, Seoul, South Korea
| | - M Ock
- Department of Preventive Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Seoul South Korea
| | - D S Go
- Department of Preventive Medicine, Korea University College of Medicine, Seoul, South Korea
| | - K A Kim
- Department of Public Health, Korea University Graduate School, Seoul, South Korea
| | - K Kim
- Department of Public Health, Korea University Graduate School, Seoul, South Korea
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Cho S, Lee H, Shin S, Park JK, Yoon SJ. Iatrogenic huge intracardiac air embolism during chest computed tomography. Korean J Intern Med 2019; 34:456-457. [PMID: 29294601 PMCID: PMC6406105 DOI: 10.3904/kjim.2017.308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 10/29/2017] [Indexed: 11/27/2022] Open
Affiliation(s)
- Seunghoon Cho
- Division of Internal Medicine, Yonsei University Medical Center, Seoul, Korea
| | - Hancheol Lee
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Sanghoon Shin
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Jong-Kwan Park
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Se-Jung Yoon
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
- Correspondence to Se-Jung Yoon, M.D. Tel: +82-31-900-0630 Fax: +82-31-900-0933 E-mail:
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Moon JY, Yun EJ, Yoon DY, Choi CS, Seo YL, Cho YK, Lim KJ, Baek S, Hong SJ, Yoon SJ. The 100 Most-Cited Articles Focused on Ultrasound Imaging: A Bibliometric Analysis. Ultraschall Med 2017; 38:311-317. [PMID: 28511228 DOI: 10.1055/s-0042-120259] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Purpose The number of citations that an article has received reflects its impact on a particular research area. The aim of this study was to identify the 100 most-cited articles focused on ultrasound (US) imaging and to analyze the characteristics of these articles. Methods We determined the 100 most-cited articles on US imaging via the Web of Science database, using the search term. The following parameters were used to analyze the characteristics of the 100 most-cited articles: publication year, journal, journal impact factor, number of citations and annual citations, authors, department, institution, country, type of article, and topic. Results The number of citations for the 100 most-cited articles ranged from 1849 to 341 (median: 442.0) and the number of annual citations ranged from 108.0 to 8.1 (median: 22.1). The majority of articles were published in 1990 - 1999 (39 %), published in radiology journals (20 %), originated in the United States (45 %), were clinical observation studies (67 %), and dealt with the vessels (35 %). The Department of Internal Medicine at the University of California and the Research Institute of Public Health at the University of Kuopio (n = 4 each) were the leading institutions and Salonen JT and Salonen R (n = 4 each) were the most prolific authors. Conclusion Our study presents a detailed list and analysis of the 100 most-cited US articles, which provides a unique insight into the historical development in this field.
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12
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Ryu SJ, Hong YK, Shin S, Cho S, Yoon SJ. Spontaneous regression of cardiac sarcoidosis resulting in total occlusion of coronary artery and ventricular aneurysm. Korean J Intern Med 2017; 32:571-572. [PMID: 28063417 PMCID: PMC5432805 DOI: 10.3904/kjim.2016.255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 08/23/2016] [Accepted: 08/23/2016] [Indexed: 11/27/2022] Open
Affiliation(s)
- Seok Jong Ryu
- Department of Radiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Yong Kook Hong
- Department of Radiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Sanghoon Shin
- Division of Cardiology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Sungjun Cho
- Division of Cardiology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Se-Jung Yoon
- Division of Cardiology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea
- Correspondence to Se-Jung Yoon, M.D. Tel: +82-31-900-0630 Fax: +82-31-900-0933 E-mail:
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Kim DY, Choi JH, Hong GR, Rim SJ, Kim JY, Lee SC, Sohn IS, Chung WJ, Seo HS, Yoon SJ, Cho KI, Choi SW, Lee KJ. Impact of Contrast Echocardiography on Assessment of Ventricular Function and Clinical Diagnosis in Routine Clinical Echocardiography: Korean Multicenter Study. J Cardiovasc Ultrasound 2017; 25:28-33. [PMID: 28400933 PMCID: PMC5385314 DOI: 10.4250/jcu.2017.25.1.28] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 03/21/2017] [Accepted: 03/21/2017] [Indexed: 11/29/2022] Open
Abstract
Background Fundamental echocardiography has some drawbacks in patients with difficult-to-image echocardiograms. The aim of this study is to evaluate impact of contrast echocardiography (CE) on ventricular function assessment and clinical diagnosis in routine clinical echocardiography. Methods Two hundred sixty patients were prospectively enrolled over 3 years in 12 medical centers in Korea. General image quality, the number of distinguishable segments, ability to assess regional wall motion, left ventricular (LV) apex and right ventricle (RV) visualization, LV ejection fraction, changes in diagnostic or treatment plan were documented after echocardiography with and without ultrasound contrast agent. Results Poor or uninterpretable general image was 31% before contrast use, and decreased to 2% (p<0.05) after contrast use. The average number of visualized LV segments was 9.53 before contrast use, and increased to 14.46 (p<0.001) after contrast use. The percentage of poor or not seen LV regional wall motion was decreased from 28.4% to 3.5% (p<0.001). The percentage of poor or not seen LV apex and RV was decreased from 49.4% to 2.4% (p<0.001), from 30.5% to 10.5% (p<0.001), respectively. Changes in diagnostic procedure and treatment plan after CE were 30% and 29.6%, respectively. Conclusion Compared to fundamental echocardiography, CE impacted LV function assessment and clinical decision making in Korean patients who undergo routine echocardiography.
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Affiliation(s)
- Doo-Youp Kim
- Department of Internal Medicine, Bongseng Memorial Hospital, Busan, Korea
| | - Jung-Hyun Choi
- Division of Cardiology, Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
| | - Geu-Ru Hong
- Division of Cardiology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Se-Joong Rim
- Division of Cardiology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Jang-Young Kim
- Division of Cardiology, Department of Internal Medicine, Wonju College of Medicine, Yonsei University, Wonju, Korea
| | - Sang-Chol Lee
- Division of Cardiology, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Il-Suk Sohn
- Department of Cardiology, Kyung Hee University School of Medicine, Seoul, Korea
| | - Wook-Jin Chung
- Division of Cardiology, Heart Center, Gachon University Gil Hospital, Gachon University School of Medicine, Incheon, Korea
| | - Hye-Sun Seo
- Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Hospital, Bucheon, Korea
| | - Se-Jung Yoon
- Division of Cardiology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Kyoung-Im Cho
- Division of Cardiology, Department of Internal Medicine, Kosin University Gospel Hospital, Busan, Korea
| | - Si-Wan Choi
- Division of Cardiology, Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea
| | - Kyung-Jin Lee
- Division of Cardiology, Department of Internal Medicine, Eulji University Hospital, Daejeon, Korea
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Yoon SJ. The Incremental Effect of Obesity on Myocardial Fibrosis In Patients with Aortic Stenosis. J Cardiovasc Ultrasound 2017; 24:274-275. [PMID: 28090253 PMCID: PMC5234344 DOI: 10.4250/jcu.2016.24.4.274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 12/07/2016] [Accepted: 12/08/2016] [Indexed: 11/22/2022] Open
Affiliation(s)
- Se-Jung Yoon
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
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15
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Hine GA, Goers AJ, Feder L, Elle JA, Yoon SJ, Milchberg HM. Generation of axially modulated plasma waveguides using a spatial light modulator. Opt Lett 2016; 41:3427-3430. [PMID: 27472585 DOI: 10.1364/ol.41.003427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate the generation of axially modulated plasma waveguides using spatially patterned high-energy laser pulses. A spatial light modulator (SLM) imposes transverse phase front modulations on a low-energy (10 mJ) laser pulse which is interferometrically combined with a high-energy (130-450 mJ) pulse, sculpting its intensity profile. This enables dynamic and programmable shaping of the laser profile limited only by the resolution of the SLM and the intensity ratio of the two pulses. The plasma density profile formed by focusing the patterned pulse with an axicon lens is likewise dynamic and programmable. Centimeter-scale, axially modulated plasmas of varying shape and periodicity are demonstrated.
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16
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Shin JY, Yoon SJ, Ahn HS, Yun YH. Effects of Per-diem payment on the duration of hospitalization and medical expenses according to the palliative care demonstration project in Korea. Int J Health Plann Manage 2016; 32:e206-e217. [PMID: 27412878 DOI: 10.1002/hpm.2366] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 02/17/2016] [Accepted: 05/19/2016] [Indexed: 12/29/2022] Open
Abstract
OBJECTIVES The aim of this study was to examine the impacts of a government-directed palliative care demonstration (PCD) project, Per-diem Payment System (PDPS), on length of stay (LOS), hospital costs, resource usage and healthcare quality during the searched period from January in 2009 to December in 2010. STUDY DESIGN A retrospective claim data review. METHODS Individuals who had been eligible for the palliative care payment policy, PDPS, during 2 years (from 2009 to 2010) were assigned to the case group including seven hospitals (n = 3117). Those (seven hospitals) who were not come eligible for the palliative care payment policy were assigned to the control group (n = 2347) with fee for service. The data used in this study were electronically submitted requests of payment to the Health Insurance Review Agency during the period January 2009 to December 2010. RESULTS After the PCD project, the length of stay for palliative patients with cancer diseases decreased by 2.56% (β = -0.026; p-value = 0.0001) among patients hospitalized in a PCD project compared with patients hospitalized in seven hospitals that was not designed as a PCD project. Compared with costs before the PCD project, costs decreased by 0.76% (β = 0.013; p-value = 0.0001). CONCLUSIONS We provided evidence regarding the change in the societal burden due to palliative care. Although there was a reduction of direct medical costs reported in limited number of hospitals, in the long term, we can anticipate an expanding impact on medical costs in all palliative hospitals. Copyright © 2016 John Wiley & Sons, Ltd.
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Abstract
The objectives of this study were to compare the risk-adjusted mortality of coronary artery bypass graft (CABG) and acute myocardial infarction (AMI) patients simultaneously in six hospitals in Seoul, Korea, and to investigate the relationship between these performance measures by developing a predictive model of mortality. The medical records of 749 AMI and 564 CABG patients were reviewed. A predictive model was developed using logistic regression, including 170 variables selected as risk factors for risk adjustment. The validity of our predictive model was demonstrated to be within an acceptable range. The results showed that one hospital with a significantly low AMI mortality rate also had a low CABG mortality rate, while another hospital with a significantly high AMI mortality rate also had a high CABG mortality rate. Our results implied that hospitals providing good-quality medical management of coronary artery disease also provided a good-quality surgical service.
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Affiliation(s)
- H K Park
- Korea Health Insurance Review Agency, Seoul, Korea
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18
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Yoon SJ, Seo HS, Park S, Chung WJ. 2-Dimensional Strain Analysis of Regional Change in Right Ventricular Function after Treadmill Exercise. J Cardiovasc Ultrasound 2016; 24:35-9. [PMID: 27081442 PMCID: PMC4828412 DOI: 10.4250/jcu.2016.24.1.35] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 10/30/2015] [Accepted: 02/01/2016] [Indexed: 11/26/2022] Open
Abstract
Background Function of right ventricle (RV) influences on symptoms and prognosis in various diseases. However the regional RV function analyzed with 2-dimensional (2D) strain echocardiography before and just after treadmill test has not been evaluated. The aim of this study was to show the change of regional RV function just after treadmill exercise with strain analysis. Methods A total of thirty eight patients who visited hospital for hypertension, chest pain or dyspnea between January 2007 and December 2010 were retrospectively analyzed (men, 47.4%; mean age, 54.9 ± 7.2 years). Treadmill exercise test and pre and post echocardiography were performed. 2D strain echocardiography was analyzed off line in RV free wall and septum. Results Mean exercise duration was 737 ± 132 sec. Tissue velocity in lateral tricuspid annulus is significantly increased in post exercise (initial, 10.5 ± 2.4 cm/sec vs. post exercise, 12.2 ± 1.8 cm/sec, p = 0.006). Systolic strain of RV free wall apex and mid portion were significantly changed in post exercise stage (free wall apex, -18.2 ± 7.6% vs. -22.3 ± 5.8%, p = 0.010; free wall mid, -14.1 ± 6.7% vs. -22.6 ± 6.8%, p = 0.022). Conclusion 2D strain imaging provides a precise tool to quantify regional RV function and reveals a characteristic regional pattern of RV after treadmill exercise.
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Affiliation(s)
- Se-Jung Yoon
- Division of Cardiology, Ilsan Hospital, National Health Insurance Service, Goyang, Korea
| | - Hye-Sun Seo
- Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Hospital, Bucheon, Korea
| | - Sujung Park
- Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Hospital, Bucheon, Korea
| | - Wook-Jin Chung
- Division of Cardiology, Gachon University, Gil Medical Center, Incheon, Korea
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19
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Kim MJ, Seo J, Cho KI, Yoon SJ, Choi JH, Shin MS. Echocardiographic Assessment of Structural and Hemodynamic Changes in Hypertension-Related Pregnancy. J Cardiovasc Ultrasound 2016; 24:28-34. [PMID: 27081441 PMCID: PMC4828411 DOI: 10.4250/jcu.2016.24.1.28] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Revised: 10/01/2015] [Accepted: 02/01/2016] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Pregnancy induces dramatic cardiovascular changes in order to meet the increasing metabolic needs. Adaptive change of left ventricle (LV) might be modified in pregnancy complicated by hypertension. METHODS Data from 193 consecutive pregnant women were analyzed. Clinical and echocardiographic data were compared in normotensive and hypertensive women. RESULTS Significantly higher LV mass indexed by height was observed in hypertensive women compared with normotensive women (84 ± 21 g/m vs. 97 ± 20 g/m, p = 0.001). Diastolic function measured by the ratio of peak velocity of early diastolic transmitral blood flow to early diastolic mitral annular velocity was impaired in hypertensive women (11.0 ± 3.0 vs. 9.2 ± 2.5, p < 0.001). Such change was more prominent in women with gestational hypertension (GH) than those with chronic hypertension (CH). Heavy maternal weight was an independent factor associated with LV hypertrophy (LVH) in both normotensive and hypertensive women. Overt eccentric LVH was more frequent than concentric remodeling/hypertrophy (24% vs. 8.4%) in GH, while the opposite result was observed in CH (14% vs. 23%). CONCLUSION Hypertensive pregnancy is associated with significant LVH and diastolic dysfunction. CH seems to induce different LV remodeling pattern from GH. Heavy maternal weight during pregnancy might intensify the unfavorable remodeling of LV, particularly in hypertensive pregnancy.
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Affiliation(s)
- Mi-Jeong Kim
- Division of Cardiology, Department of Internal Medicine, Incheon St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
| | - Jonggoo Seo
- Division of Cardiology, Department of Internal Medicine, Hallym Hospital, Incheon, Korea
| | - Kyoung-Im Cho
- Division of Cardiology, Department of Internal Medicine, Kosin University School of Medicine, Busan, Korea
| | - Se-Jung Yoon
- Division of Cardiology, Department of Internal Medicine, NHIC Ilsan Hospital, Goyang, Korea
| | - Jung-Hyun Choi
- Division of Cardiology, Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
| | - Mi-Seung Shin
- Division of Cardiology, Department of Internal Medicine, Gachon University, Gil Medical Center, Incheon, Korea
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Shin S, Lee JY, Park JK, Oh S, Jeon DW, Yang JY, Yoon SJ. The Characteristic Doppler Pattern of the Left Ventricular Outflow Tract in a Patient with Orthostatic Hypotension. Korean Circ J 2016; 46:268-9. [PMID: 27014360 PMCID: PMC4805574 DOI: 10.4070/kcj.2016.46.2.268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 08/27/2015] [Indexed: 12/02/2022] Open
Affiliation(s)
- Sanghoon Shin
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Ja Young Lee
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Jong-Kwan Park
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Seungjin Oh
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Dong Woon Jeon
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Joo Young Yang
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Se-Jung Yoon
- Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
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21
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Oh JK, Kim KT, Yoon SJ, Kim SW, Kim TB. Second to fourth digit ratio: a predictor of adult testicular volume. Andrology 2014; 2:862-7. [PMID: 25116409 DOI: 10.1111/j.2047-2927.2014.00256.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 07/02/2014] [Accepted: 07/11/2014] [Indexed: 11/30/2022]
Abstract
It has been suggested that second to fourth digit ratio (digit ratio) may correlate with male reproductive system function or disorders. This hypothesis is based on finding that the Hox genes control finger development and differentiation of the genital bud during embryogenesis. Thus, we investigated the association between digit ratio and adult testicular volume. A total of 172 Korean men (aged 20-69 years) hospitalized for urological surgery were prospectively enrolled. Patients with conditions known to strongly influence testicular volume were excluded. Before determining testicular volume, the lengths of the second and fourth digits of the right hand were measured by a single investigator using a digital vernier calliper. Using orchidometry, the testes were measured by an experienced urologist who had no information about the patient's digit ratio. To identify the independent predictive factors influencing testicular volume, univariate and multivariate analyses were performed using linear regression models. Age, height, serum testosterone and free testosterone level were not correlated with testicular volume. Digit ratio, along with weight, was significantly correlated with testicular volume (right testicular volume: r = -0.185, p = 0.015; left testicular volume: r = -0.193, p = 0.011; total testicular volume: r = -0.198, p = 0.009). Multivariate analysis using linear regression models showed that only digit ratio was the independent factor to predict all (right, left and total) testicular volumes (right testicular volume: β = -0.174, p = 0.023; left testicular volume: β = -0.181, p = 0.017; total testicular volume: β = -0.185, p = 0.014). Our findings demonstrated that digit ratio is negatively associated with adult testicular volume. This means that men with a higher digit ratio may be more likely to have smaller testis compared to those with a lower digit ratio.
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Affiliation(s)
- J K Oh
- Department of Urology, Gachon University Gil Hospital, Incheon, Korea
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22
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Shinde KN, Dhoble SJ, Yoon SJ, Park K. Synthesis and photoluminescence of novel NaLi2PO4:Tb(3+) nanophosphors for near-ultraviolet excited light emitting diodes. J Nanosci Nanotechnol 2014; 14:5957-5960. [PMID: 25936035 DOI: 10.1166/jnn.2014.8293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A series of Tb(3+)-activated NaLi2PO4 novel nano-crystalline phosphors was synthesized by the solution combustion method. The prepared Na(1-x)Li2PO4:xTb(3+) (0.01 ≤ x ≤ 0.1) phosphors crystallized in the orthorhombic crystal structure. Its effective absorption in the near ultraviolet range allowed highly efficient green emission. The Na(1-x)Li2PO4:xTb(3+) phosphors showed characteristic (5)D4 --> (7)FJ (J = 3, 4, 5, and 6) transitions of Tb(3+), i.e., (5)D4 --> (7)F6 (488 nm), (5)D4 --> (7)F5 (545 nm), (5)D4 --> (7)F4 (583 nm), and (5)D4 --> (7)F3 (622 nm). The Na0.95Li2PO4:0.05Tb(3+) phosphor showed the most excellent emission efficiency. The present work suggests that the Na0.95Li2PO4:0.05Tb(3+) is a potential green-emitting phosphor for near ultraviolet excited light emitting diodes.
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23
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Hakeem A, Shinde KN, Yoon SJ, Dhoble SJ, Park K. Synthesis and photoluminescence of novel Ca(1-x)MgP2O7:xEu(3+) pyrophosphate phosphor for near ultraviolet light emitting diodes. J Nanosci Nanotechnol 2014; 14:5873-5876. [PMID: 25936018 DOI: 10.1166/jnn.2014.8302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We studied the microstructure and photoluminescence properties of Ca(1-x)MgP2O7:xEu(3+) (0.01 ≤ x ≤ 0.2) phosphors, considering Eu(3+) content. The Ca(1-x)MgP2O7:xEu(3+) phosphors crystallized in the monoclinic structure, belonging to the space group of P2(1)/n. The Ca(1-x)MgP2O7:xEu(3+) phosphors showed a nanocrystalline nature. In the FT-IR and Raman spectra, the stretching vibrations of PO3 and P-O-P groups in (P2O7)(4-) were observed. The amount of Eu(3+) content significantly affected the magnitude of the excitation and emission intensities. The excitation intensity at 393 nm and the emission intensity at 605-628 nm were increased with an increase in Eu(3+) content up to x = 0.1 and then decreased with further increasing Eu(3+) content. The strong emission intensity under near ultraviolet excitation makes it possible red phosphor for generating white light based on LEDs.
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Abstract
We present the first multi-Watt demonstration of a diode pumped cryogenically cooled neodymium-doped yttrium aluminum garnet (YAG) laser operating at 946 nm on the (4)F(3/2) → (4)I(9/2) transition. 3.8 W of continuous wave output power for 12.8 W of absorbed pump was obtained with a slope efficiency of 47%. In addition, we made an extensive characterization of the spectroscopic properties around the pump and laser wavelengths over the temperature range of 77 K to 300 K to find an increase of ~2.5 times for both the absorption and emission cross sections at the lowest temperature.
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Abstract
The energy gain in laser wakefield acceleration is ultimately limited by dephasing, occurring when accelerated electrons outrun the accelerating phase of the wakefield. We apply quasi-phase-matching, enabled by axially modulated plasma channels, to overcome this limitation. Theory and simulations are presented showing that weakly relativistic laser intensities can drive significant electron energy gains.
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Affiliation(s)
- S J Yoon
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20740, USA
| | - J P Palastro
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20740, USA
| | - H M Milchberg
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20740, USA
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Affiliation(s)
- Se-Jung Yoon
- Division of Cardiology , NHI Ilsan Hospital , Goyang , Republic of Korea
| | - Dong Woon Jeon
- Division of Cardiology , NHI Ilsan Hospital , Goyang , Republic of Korea
| | - Joo Young Yang
- Division of Cardiology , NHI Ilsan Hospital , Goyang , Republic of Korea
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27
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Kwon SW, Kim BO, Kim MH, Lee SJ, Yoon JH, Chung H, Shim CY, Cho DK, Ryu SK, Yoon SJ, Yoon YW, Chang HJ, Rim SJ, Kwon HM, Jang Y, Hong BK. Diverse left ventricular morphology and predictors of short-term outcome in patients with stress-induced cardiomyopathy. Int J Cardiol 2013; 168:331-7. [DOI: 10.1016/j.ijcard.2012.09.050] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 06/19/2012] [Accepted: 09/15/2012] [Indexed: 01/27/2023]
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Yoon SJ, Goers AJ, Hine GA, Magill JD, Elle JA, Chen YH, Milchberg HM. Shock formation in supersonic cluster jets and its effect on axially modulated laser-produced plasma waveguides. Opt Express 2013; 21:15878-15887. [PMID: 23842374 DOI: 10.1364/oe.21.015878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We examine the generation of axially modulated plasmas produced from cluster jets whose supersonic flow is intersected by thin wires. Such plasmas have application to modulated plasma waveguides. By appropriately limiting shock waves from the wires, plasma axial modulation periods can be as small as 70 μm, with plasma structures as narrow as 45 µm. The effect of shocks is eliminated with increased cluster size accompanied by a reduced monomer component of the flow.
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Affiliation(s)
- S J Yoon
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742, USA
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29
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Yoon SJ, Park JK, Oh S, Jeon DW, Yang JY, Choi YS, Youn HJ. Various expressions of coronary Doppler patterns of myocardial bridging. Korean Circ J 2013; 43:284-5. [PMID: 23682292 PMCID: PMC3654120 DOI: 10.4070/kcj.2013.43.4.284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Revised: 12/07/2012] [Accepted: 12/10/2012] [Indexed: 11/11/2022] Open
Affiliation(s)
- Se-Jung Yoon
- Division of Cardiology, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea
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30
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Yim H, Kong WY, Yoon SJ, Kim YC, Choi JW. Fabrication and electrochemical properties of hemisphere structured 3D Li(Li0.2Mn0.54Co0.13Ni0.13)O2 cathode thin film for all-solid-state lithium battery. J Nanosci Nanotechnol 2013; 13:3459-3463. [PMID: 23858879 DOI: 10.1166/jnn.2013.7273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode thin films were deposited on planar, hemisphere, linked hemisphere, and isolated hemisphere structured Pt current collector thin films to investigate the effect of 3-dimensional (3-D) structure for the electrochemical properties of active cathode thin films. The films of linked hemisphere structure shows the highest initial discharge capacity of 140 microA h/cm2-microm which is better than those of planar (62 microA h/cm2-microm), hemisphere (94.6 microA h/cm2-microm), and isolated hemisphere (135 microA h/cm2-microm) films due to increase of surface area for cathode thin films. Linked hemisphere shows the biggest capacity and the best retention rate because 6 nanobridges of each hemisphere bring strong connection.
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Affiliation(s)
- H Yim
- Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea
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31
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Lee JJ, Kim JS, Yoon SJ, Cho YS, Choi JW. Electrical and optical properties of indium zinc oxide (IZO) thin films by continuous composition spread. J Nanosci Nanotechnol 2013; 13:3317-3320. [PMID: 23858851 DOI: 10.1166/jnn.2013.7274] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Indium zinc oxide (IZO) films were deposited on glass substrate at room temperature using off-axis RF sputtering-continuous composition spread (CCS) system. The full range composition of IZO films were controlled by the deposition rate and thickness profiles of In2O3 and ZnO target. The structural, electrical and optical properties of IZO thin films were measured as functions of position. IZO thin film had the lowest resistivity and highest carrier concentration at the position of 15 mm (5.02 x 10(-4) omega cm, 3.9 x 10(20)/cm3). And IZO thin film had high transmittance in visible region at measured all positions. This study has investigated to explore the new composition of IZO films using CCS system.
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Affiliation(s)
- J J Lee
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea
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Kwak MS, Yoon SJ, Cho YH, Hong SM, Park JK, Oh S, Jeon DW, Yang JY. The Correlation Between Achilles Tendon Thickness and Cardiovascular Risk Factors. J Lipid Atheroscler 2013. [DOI: 10.12997/jla.2013.2.2.77] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Min-seob Kwak
- Division of Cardiology, NHIS Ilsan Hospital, Goyang, Korea
| | - Se-Jung Yoon
- Division of Cardiology, NHIS Ilsan Hospital, Goyang, Korea
| | | | - Suk-Min Hong
- Division of Cardiology, NHIS Ilsan Hospital, Goyang, Korea
| | - Jong-Kwan Park
- Division of Cardiology, NHIS Ilsan Hospital, Goyang, Korea
| | - Seungjin Oh
- Division of Cardiology, NHIS Ilsan Hospital, Goyang, Korea
| | - Dong Woon Jeon
- Division of Cardiology, NHIS Ilsan Hospital, Goyang, Korea
| | - Joo Young Yang
- Division of Cardiology, NHIS Ilsan Hospital, Goyang, Korea
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Han JY, Nam BH, Kim HY, Yoon SJ, Kim HT, Lee JS. A randomized phase II study of irinotecan plus cisplatin versus irinotecan plus capecitabine with or without isosorbide-5-mononitrate in advanced non-small-cell lung cancer. Ann Oncol 2012; 23:2925-2930. [PMID: 22782331 DOI: 10.1093/annonc/mds122] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND We investigated the efficacy of irinotecan/cisplatin (IP) versus irinotecan/capecitabine (IX) with or without isosorbide-5-mononitrate (ISMN) in chemo-naïve advanced non-small-cell lung cancer. PATIENTS AND METHODS Initially, 74 patients were randomly assigned to either IP or IX. Given the potential benefits of ISMN on chemotherapy, the protocol was amended during the study. Subsequently, 72 patients were randomly assigned to either IP + ISMN or IX + ISMN. Patients were treated with predefined second-line therapies (docetaxel/capecitabine for IP or IP + ISMN, docetaxel/cisplatin for IX or IX + ISMN) when disease progressed. RESULTS A total of 146 received treatment. Response rate (RR), median progression-free survival (PFS) and overall survival (OS) were 49%, 5.5 months, 14.5 months in IP; 33%, 3.3 months, 13.0 months in IP + ISMN; 30%, 4.3 months, 16.1 months in IX; and 25%, 3.4 months, 13.6 months in IX + ISMN, respectively. While IP arm showed a trend toward higher RR and longer PFS than IX arm, IX arm showed a trend toward longer OS than IP arm. No significant differences were observed between IP + ISMN and IX + ISMN. CONCLUSION IP showed better RR and PFS but no OS benefit when compared with IX. The addition of ISMN to IP or IX chemotherapy did not seem to improve the treatment outcome.
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Affiliation(s)
- J Y Han
- Center for Lung Cancer; Center for Clinical Trial, Research Institute and Hospital, National Cancer Center, Goyang-si, Gyeonggi-do, Republic of Korea
| | - B H Nam
- Center for Clinical Trial, Research Institute and Hospital, National Cancer Center, Goyang-si, Gyeonggi-do, Republic of Korea
| | | | | | - H T Kim
- Center for Lung Cancer; Center for Clinical Trial, Research Institute and Hospital, National Cancer Center, Goyang-si, Gyeonggi-do, Republic of Korea
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Abstract
A new method for real-time monitoring of the oxygen uptake rate (OUR) in bioreactors, based on dissolved oxygen (DO) measurement at two points, has been developed and tested extensively. The method has several distinct advantages over known techniques.It enables the continuous and undisturbed monitoring of OUR, which is conventionally impossible without gas analyzers. The technique does not require knowledge of k(L)a. It provides smooth, robust, and reliable signal. The monitoring scheme is applicable to both microbial and mammalian cell bioprocesses of laboratory or industrial scale. The method was successfully used in the cultivation of NSO-derived murine myeloma cell line producing monoclonal antibody. It was found that while the OUR increased with the cell density, the specific OUR decreased to approximately one-half at cell concentrations of 16 x 10(6) cells/mL, indicating gradual reduction of cell respiration activity. Apart from the laboratory scale cultivation, the method was applied to industrial scale perfusion culture, as well as to processes using other cell lines. (c) 1994 John Wiley & Sons, Inc.
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Affiliation(s)
- S J Yoon
- Miles Biotechnology, 4th & Parker Streets, P.O. Box 1986, Berkeley, CA 94701
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Yun YH, Kim YA, Min YH, Park S, Won YJ, Kim DY, Choi IJ, Kim YW, Park SJ, Kim JH, Lee DH, Yoon SJ, Jeong SY, Noh DY, Heo DS. The influence of hospital volume and surgical treatment delay on long-term survival after cancer surgery. Ann Oncol 2012; 23:2731-2737. [PMID: 22553194 DOI: 10.1093/annonc/mds101] [Citation(s) in RCA: 145] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND We conducted a population-based retrospective cohort study to investigate the influence of hospital volume, delay of surgery, and both together on the long-term survival of postoperative cancer patients. METHODS Using information from the Korea Central Cancer Registry from 2001 through 2005 and the National Health Insurance claim database, we determined survival for 147 682 patients who underwent definitive surgery for any of six cancers. RESULTS Regardless of cancer site, surgical patients in low- to medium-volume hospitals showed significantly worse survival [adjusted hazard ratio (aHR) = 1.36-1.86] than those in high-volume hospitals in multivariable analyses. Among the latter, treatment delays > 1 month were not associated with worse survival for stomach, colon, pancreatic, or lung cancer but were for rectal [aHR = 1.28; 95% confidence interval (CI), 1.17-1.40] and breast (aHR = 1.59; 95% CI, 1.37-1.84) cancer. For patients in low- to medium-volume hospitals, treatment delay was associated with worse survival for all types of cancer (aHR = 1.78-3.81). CONCLUSION Our findings suggest that the effect of hospital volume and surgical treatment delay on overall survival of cancer patients should be considered in formulating or revising national health policy.
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Affiliation(s)
- Y H Yun
- Cancer Research Institute, Seoul National University Hospital and College of Medicine, Seoul
| | - Y A Kim
- Research Institute and Hospital, National Cancer Center, Goyang; Department of Preventive Medicine, Korea University, Seoul
| | - Y H Min
- Research Institute and Hospital, National Cancer Center, Goyang
| | - S Park
- The Korea Central Cancer Registry, Division of Cancer Registration and Surveillance, National Cancer Center, Goyang
| | - Y J Won
- The Korea Central Cancer Registry, Division of Cancer Registration and Surveillance, National Cancer Center, Goyang
| | - D Y Kim
- Research Institute and Hospital, National Cancer Center, Goyang
| | - I J Choi
- Research Institute and Hospital, National Cancer Center, Goyang
| | - Y W Kim
- Research Institute and Hospital, National Cancer Center, Goyang
| | - S J Park
- Research Institute and Hospital, National Cancer Center, Goyang
| | - J H Kim
- Health Insurance Review and Assessment Service, Seoul
| | - D H Lee
- Department of Oncology, Asan Medical Center, Seoul
| | - S J Yoon
- Department of Preventive Medicine, Korea University, Seoul
| | - S Y Jeong
- Department of Surgery, Cancer Research Institute, Seoul
| | - D Y Noh
- Department of Surgery, Cancer Research Institute, Seoul.
| | - D S Heo
- Department of Medicine, Seoul National University College of Medicine, Seoul, Korea
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Hong SM, Yoon SJ, Rim SJ. Contrast echo-a simple diagnostic tool for a coronary artery fistula. Korean Circ J 2012; 42:205-7. [PMID: 22493617 PMCID: PMC3318094 DOI: 10.4070/kcj.2012.42.3.205] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Revised: 06/20/2011] [Accepted: 07/20/2011] [Indexed: 12/25/2022] Open
Abstract
Coronary artery fistulas have been diagnosed with aortography, coronary angiography, and coronary computed tomography (CT). A large fistula can be occasionally found as a mass lesion on echocardiography but cannot be easily confirmed. Here, we report a new diagnostic approach to coronary artery fistulas using a contrast agent and transthoracic echocardiography. Transthoracic echocardiography of a 46-year-old female suffering from dyspnea revealed suspicious small turbulent flow in the main pulmonary artery. Following infusion of a contrast agent, we found whitish flow in the main pulmonary artery during the diastolic phase, and aortic CT revealed two huge right coronary artery fistulas in the main pulmonary artery. A simple diagnostic approach to a coronary artery fistula using contrast agent helped us confirm the diagnosis because of the typical diastolic whitish flow in the pulmonary artery.
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Affiliation(s)
- Suk-Min Hong
- Cardiology Division, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea
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Kwon SW, Kim BO, Kim MH, Shim CY, Cho DK, Yoo SK, Yoon SJ, Hong BK. PREDICTORS FOR IN-HOSPITAL MORTALITY IN PATIENTS WITH STRESS-INDUCED CARDIOMYOPATHY PRESENTING DIVERSE MORPHOLOGIC SPECTRUMS OF LEFT VENTRICLE. J Am Coll Cardiol 2012. [DOI: 10.1016/s0735-1097(12)61561-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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An HS, Kim EM, Lee JH, Noh JK, An CM, Yoon SJ, Park KD, Myeong JI. Population genetic structure of wild and hatchery black rockfish Sebastes inermis in Korea, assessed using cross-species microsatellite markers. Genet Mol Res 2011; 10:2492-504. [PMID: 22009861 DOI: 10.4238/2011.october.13.6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The population structure of the black rockfish, Sebastes inermis (Sebastidae), was estimated using 10 microsatellite loci developed for S. schlegeli on samples of 174 individuals collected from three wild and three hatchery populations in Korea. Reduced genetic variation was detected in hatchery strains [overall number of alleles (N(A)) = 8.07; allelic richness (A(R)) = 7.37; observed heterozygosity (H(O)) = 0.641] compared with the wild samples (overall N(A) = 8.43; A(R) = 7.83; H(O) = 0.670), but the difference was not significant. Genetic differentiation among the populations was significant (overall F(ST) = 0.0237, P < 0.05). Pairwise F(ST) tests, neighbor-joining tree, and principal component analyses showed significant genetic heterogeneity among the hatchery strains and between wild and hatchery strains, but not among the wild populations, indicating high levels of gene flow along the southern coast of Korea, even though the black rockfish is a benthic, non-migratory marine species. Genetic differentiation among the hatchery strains could reflect genetic drift due to intensive breeding practices. Thus, in the interests of optimal resource management, genetic variation should be monitored and inbreeding controlled within stocks in commercial breeding programs. Information on genetic population structure based on cross-species microsatellite markers can aid in the proper management of S. inermis populations.
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Affiliation(s)
- H S An
- Genetics and Breeding Research Center, National Fisheries Research and Development Institute, Gyeongsangnamdo, Korea.
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Kim BK, Oh SJ, Yoon SJ, Jeon DW, Ko YG, Yang JY. A randomized study assessing the effects of pretreatment with cilostazol on periprocedural myonecrosis after percutaneous coronary intervention. Yonsei Med J 2011; 52:717-26. [PMID: 21786434 PMCID: PMC3159932 DOI: 10.3349/ymj.2011.52.5.717] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
PURPOSE It is unknown whether cilostazol pretreatment reduces postprocedural myonecrosis (PPMN). Cilostazol pretreatment reduces PPMN after percutaneous coronary intervention (PCI). MATERIALS AND METHODS A total of 120 patients with stable angina scheduled for elective PCI were randomly assigned to a 7-day pretreatment with Cilostazol (200 mg/day) or to a control group. Creatine kinase-MB (CK-MB) and cardiac troponin I (cTnI) levels were measured at baseline and at 6 and 24 hours after PCI. The primary end-point was the occurrence of PPMN, defined as any CK-MB elevation above the upper normal limit (UNL). Aspirin and clopidogrel were co-administered for 7 days before PCI, and resistance to these agents was then assayed using the VerifyNow System. RESULTS There was no difference in baseline characteristics between the final analyzable cilostazol (n=54) and the control group (n=56). Despite a significantly greater % inhibition of clopidogrel in the cilostazol group (39±23% versus 25±22%, p=0.003), the incidence of PPMN was similar between the cilostazol group (24%) and the control group (25%, p=1.000). The rate of CK-MB elevation at ≥3 times UNL was also similar between the two groups (6% versus 5%, p=0.583). The incidence of cTnI increase over the UNL or to 3 times the UNL was not different between the two groups. There was no significant difference in terms of the rate of adverse events during follow- up, although the cilostazol group showed a tendency to have a slightly higher incidence of entry site hematoma. CONCLUSION This trial demonstrated that adjunctive cilostazol pretreatment might not significantly reduce PPMN after elective PCI in patients with stable angina.
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Affiliation(s)
- Byeong-Keuk Kim
- Cardiology Division, Cardiovascular Center of National Health Insurance Corporation Ilsan Hospital, Goyang, Korea
- Division of Cardiology, Yonsei Cardiovascular Center, Yonsei University College of Medicine, Seoul, Korea
| | - Seung Jin Oh
- Cardiology Division, Cardiovascular Center of National Health Insurance Corporation Ilsan Hospital, Goyang, Korea
| | - Se-Jung Yoon
- Cardiology Division, Cardiovascular Center of National Health Insurance Corporation Ilsan Hospital, Goyang, Korea
| | - Dong Woon Jeon
- Cardiology Division, Cardiovascular Center of National Health Insurance Corporation Ilsan Hospital, Goyang, Korea
| | - Young-Guk Ko
- Division of Cardiology, Yonsei Cardiovascular Center, Yonsei University College of Medicine, Seoul, Korea
| | - Joo Young Yang
- Cardiology Division, Cardiovascular Center of National Health Insurance Corporation Ilsan Hospital, Goyang, Korea
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Yoon SJ, Park JK, Oh S, Jeon DW, Yang JY, Hong SM, Kwak MS, Choi YS, Rim SJ, Youn HJ. A Warm Footbath Improves Coronary Flow Reserve in Patients with Mild-to-Moderate Coronary Artery Disease. Echocardiography 2011; 28:1119-24. [DOI: 10.1111/j.1540-8175.2011.01493.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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41
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Yoon SJ, Park JK, Oh S. An incidentally found unusual quadricuspid pulmonary valve with transthoracic echocardiography. Eur J Echocardiogr 2011; 12:489. [PMID: 21565868 DOI: 10.1093/ejechocard/jer054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Se-Jung Yoon
- Cardiology Division, NHIC Ilsan Hospital, Baeksuk 1dong 1232 Ilsandong-ku, Goyang, Kyungido, Korea.
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Cho KI, Kim SM, Shin MS, Kim EJ, Cho EJ, Seo HS, Shin SH, Yoon SJ, Choi JH. Impact of gestational hypertension on left ventricular function and geometric pattern. Circ J 2011; 75:1170-6. [PMID: 21389638 DOI: 10.1253/circj.cj-10-0763] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND The effect of gestational hypertension on left ventricular (LV) function in previously normotensive young women has not been evaluated. METHODS AND RESULTS A total of 106 gestational hypertensive women (GHW, 32.3 ± 4.2 years) and 93 normotensive pregnant women (NPW, 30.2 ± 4.4 years) were enrolled. Transthoracic echocardiography, including 2-dimensional strain echocardiography, was done and myocardial performance (Tei index), LV mass index (LVMI), and relative wall thickness (RWT) were analyzed. GHW had significantly increased wall thickness (interventricular septum, 9.5 ± 0.9 mm vs. 8.8 ± 1.0 mm, P < 0.001; posterior wall, 9.0 ± 1.1 mm vs. 8.5 ± 1.1 mm, P = 0.007; and RWT, 0.39 ± 0.06 vs. 0.35 ± 0.05, P = 0.02), higher LVMI (95.6 ± 17.3g/m² vs. 86.1 ± 14.5g/m², P = 0.03), longer isovolumetric relaxation time (117.7 ± 18.2 ms vs. 82.3 ± 12.6 ms, P = 0.003), lower E/A ratio (1.00 ± 0.29 vs. 1.27 ± 0.33, P = 0.002), and higher Tei index (0.48 ± 0.23 vs. 0.33 ± 0.13, P = 0.003) compared to NPW. Global longitudinal LV strain, representing LV systolic function, was also significantly reduced in GHW compared with NPW (-17.6 ± 2.95% vs. -21.2 ± 2.14%, P = 0.02). A total of 62% of GHW (n = 66) had abnormal geometry, of whom, 42 (40%) had eccentric hypertrophy (EH). A total of 93% of NPW (n = 86) had normal geometry, and only 7 NPW (7%) had abnormal geometry. CONCLUSIONS GHW had aggravated diastolic and longitudinal systolic dysfunction. GHW had increased LVMI with the abnormal geometric pattern of EH. The reversibility of these morphological and functional impairments after delivery needs to be clarified.
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Affiliation(s)
- Kyoung-Im Cho
- Division of Cardiology, Maryknoll Medical Center, Busan, Korea
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Kim JE, Yoon SJ, Kim J, Jung JY, Jeong HS, Cho HB, Shin E, Lyoo IK, Kim TS. Efficacy and tolerability of mirtazapine in treating major depressive disorder with anxiety symptoms: an 8-week open-label randomised paroxetine-controlled trial. Int J Clin Pract 2011; 65:323-9. [PMID: 21314870 DOI: 10.1111/j.1742-1241.2010.02624.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
AIMS Prominent anxiety symptoms are related to poor clinical course and outcome in major depressive disorder (MDD). The aim of this randomised, open-label, controlled study is to compare the efficacy and tolerability of mirtazapine in the form of orally disintegrating tablets against paroxetine in treating MDD patients with anxiety symptoms. METHODS A total of 60 MDD patients with a score above 18 on the Hamilton Anxiety Rating Scale (HARS) were randomly assigned to 8 weeks of fixed dosing treatment with mirtazapine (15-30 mg/day) and paroxetine (10-20 mg/day). Efficacy was primarily assessed with the HARS and with the 17-item Hamilton Depression Rating Scale (HDRS) at weeks 1, 2, 4 and 8 after treatment. Tolerability was assessed from adverse events. RESULTS The generalised estimating equations (GEE) models showed that the rates of improvement in HDRS scores from baseline to week 8 were similar between mirtazapine and paroxetine groups. However, patients with mirtazapine exhibited earlier improvement in HARS scores at weeks 1 and 2. Week-by-week GEE models showed that these significant differences in improvement of HARS scores between the two treatment groups were detectable from the first evaluation after the treatment (week 1) and maintained through week 2. There was no difference in the overall frequency of adverse events experienced between the two treatment groups. The most common adverse event in the mirtazapine group was somnolence (n = 8), whereas that in the paroxetine group was gastrointestinal discomfort (n = 9). CONCLUSIONS Mirtazapine and paroxetine were equally effective and well tolerated for the depressive symptoms in MDD patients with the high level of anxiety symptoms. Mirtazapine was, however, more effective in reducing the anxiety symptoms than paroxetine in the early weeks of treatment, suggesting that mirtazapine may have an earlier-onset action for the anxiety symptoms in MDD patients.
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Affiliation(s)
- J E Kim
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, South Korea
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Chang JH, Yoon SJ, Han SH, Shin SK, Jeon DW, Yang JY, Kang EW. The impact of dialysis modality on arterial stiffness in patients with end-stage renal disease. Ren Fail 2011; 32:947-53. [PMID: 20722562 DOI: 10.3109/0886022x.2010.502607] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Arterial stiffness determined by brachial-ankle pulse wave velocity (baPWV) has been established as a powerful predictor of cardiovascular mortality in hemodialysis (HD) patients. There are, however, few studies regarding the comparative impact of different renal replacement therapies (RRTs) on PWV. Therefore, we conducted a cross-sectional study to compare arterial wall properties and cardiac function between patients treated with continuous ambulatory peritoneal dialysis (CAPD) and those with HD who were matched for age, dialysis duration, and blood pressure. METHODS baPWV and transthoracic echocardiography (TTE) were performed in HD patients (n = 23) after 1 h of midweek dialysis session and CAPD patients (n = 26) with empty abdomen after drainage of dialysate. The baseline data were retrospectively reviewed. RESULTS baPWV was significantly higher in HD patients than in CAPD patients (18.1 +/- 2.8 vs. 16.1 +/- 2.7 m/s, p = 0.015). TTE revealed significantly increased E/E', left atrial volume index (LAVI), and inferior vena cava (IVC) diameter index in HD patients compared with CAPD patients (p < 0.05). In a multivariate regression analysis adjusted for dialysis modality, age, systolic BP, residual glomerular filtration rate, diabetes, and echocardiographic parameters, HD was independently associated with increased baPWV. CONCLUSION This study showed that HD patients had significantly increased arterial stiffness and severe diastolic dysfunction compared with CAPD patients.
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Affiliation(s)
- Jae Hyun Chang
- Department of Internal Medicine, Gachon University of Medicine and Science, Incheon, Korea
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Yoon SJ, Choi EY, Jung JH, Rim SJ. An Atypical Mitral Valve Prolapse in a Patient With Behçet's Disease. Korean Circ J 2011; 41:217-9. [PMID: 21607174 PMCID: PMC3098416 DOI: 10.4070/kcj.2011.41.4.217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Revised: 08/09/2010] [Accepted: 08/17/2010] [Indexed: 12/03/2022] Open
Abstract
We report the case of a 42-year-old male who was admitted to the hospital with progressive dyspnea. Cardiomegaly and diffuse pulmonary edema were visible on chest X-ray and multiple oral and genital ulcers on physical examination. On admission, echocardiography revealed mitral valve prolapse (MVP) predominantly involving a basal portion of the posterior leaflet, with severe mitral regurgitation. A successful mitral valve replacement with St. Jude #29 was performed, after pre-treatment with prednisolone for 2 weeks. Fifteen months following the operation, the patient expired from severe pulmonary edema and secondary pneumonia. This case demonstrates, for the first time in the literature, an unusual feature of mitral prolapse in the basal portion with severe mitral regurgitation in a patient with Behçet's disease. As suggested by this case, we should consider an atypical type of MVP as a possible inflammatory involvement of the heart in patients with Behçet's disease.
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Affiliation(s)
- Se-Jung Yoon
- Cardiology Division, NHIC Ilsan Hospital, Goyang, Korea
| | - Eui-Young Choi
- Cardiology Division, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Jae-Hun Jung
- Cardiology Division, Department of Internal Medicine, Hallym University College of Medicine, Seoul, Korea
| | - Se-Joong Rim
- Cardiology Division, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
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Abstract
RAGE is pattern recognizing receptors for diverse endogenous ligands. RAGE activation by RAGE ligands is known to be associated with reactive oxygen species generation, activation of NF kappa B, as well as recruitment of proinflammatory cells. Activated endothelial cells, vascular smooth muscle cells in atherosclerotic plaques and activated inflammatory cells all have increased expression of RAGE, which with its interaction with RAGE ligands increases the secretion of proinflammatory cytokines and cell adhesion molecules. Furthermore, RAGE may have a significant role in leukocyte recruitment into the intima of the atherosclerosis. Initial insults resulting in endothelial dysfunction will result in leukocyte infiltration, oxidative stress and vascular inflammation that is amplified by RAGE activation. RAGE and its interaction with RAGE ligands may be important for initializing and maintaining the pathological processes that result in various entities of cardiovascular disease. Soluble RAGE competitively inhibits the binding of RAGE ligands to RAGE and attenuates the development of atherosclerosis in vivo. Thus RAGE may be a promising target for treatment of cardiovascular disease in the future.
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Affiliation(s)
- Sungha Park
- Division of Cardiology, Yonsei University College of Medicine, Seoul, South Korea.
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Kwac MS, Yoon SJ, Oh SJ, Jeon DW, Kim DH, Yang JY. A rare case of radial arteriovenous fistula after coronary angiography. Korean Circ J 2010; 40:677-9. [PMID: 21267392 PMCID: PMC3025343 DOI: 10.4070/kcj.2010.40.12.677] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2010] [Accepted: 05/20/2010] [Indexed: 11/23/2022] Open
Abstract
The percutaneous transfemoral approach has been routinely used for cardiac catheterization and coronary angioplasty. Local vascular complications following angioplasty are seen in 5% to 10% of patients, especially in those who need prolonged anticoagulation. Transradial access for coronary procedures dramatically reduces access site complications. We report a rare case of radial arteriovenous fistula, which developed after coronary angiography perfomed using the transradial approach.
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Affiliation(s)
- Min Seub Kwac
- Division of Cardiology, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea
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Bae S, Kim JE, Hwang J, Lee YS, Lee HH, Lee J, Lyoo IK, Renshaw PF, Yoon SJ. Increased prevalence of white matter hyperintensities in patients with panic disorder. J Psychopharmacol 2010; 24:717-23. [PMID: 18957476 DOI: 10.1177/0269881108098476] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of the current study is to compare the prevalence, severity and location of cerebral white matter hyperintensities (WMH) between patients with panic disorder (PD) and healthy control subjects. Patients with PD (n = 24) and matched healthy control subjects (n = 24) were scanned using a 3.0 Tesla whole-body magnetic resonance scanner. Axial T2-weighted and fluid-attenuated inversion recovery images were acquired and evaluated for the prevalence, severity and location of WMH using the modified composite scale of Fazekas and Coffey and coded separately for deep and periventricular WMH. Logistic regression analyses were used to assess the association between WMH and the diagnosis of PD. A greater severity of total WMH was associated with a diagnosis of PD in a dose-dependent pattern (odds ratio [OR] = 8.8, P = 0.005 for mild WMH; OR = 27.7, P = 0.007 for moderate to severe WMH). Deep WMH, where most group differences originated, were predominantly located in the frontal region of the brain (n = 16 in PD, n = 1 in control). The current report is the first study to report an increased prevalence of WMH in patients with PD.
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Affiliation(s)
- S Bae
- Department of Psychiatry, Seoul National University and Hospital, Seoul, South Korea
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Yoon SJ, Yoon YW, Lee BK, Kwon HM, Hwang KC, Kim M, Chang W, Hong BK, Lee YH, Park SJ, Min PK, Rim SJ. Potential role of HMG CoA reductase inhibitor on oxidative stress induced by advanced glycation endproducts in vascular smooth muscle cells of diabetic vasculopathy. Exp Mol Med 2010; 41:802-11. [PMID: 19641377 DOI: 10.3858/emm.2009.41.11.086] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Advanced glycation endproducts (AGEs)-induced vascular smooth muscle cell (VSMCs) proliferation and formation of reactive oxygen species (ROS) are emerging as one of the important mechanisms of diabetic vasculopathy but little is known about the antioxidative action of HMG CoA reductase inhibitor (statin) on AGEs. We hypothesized that statin might reduce AGEs-induced intracellular ROS of VSMCs and analyzed the possible mechanism of action of statin in AGEs-induced cellular signaling. Aortic smooth muscle cell of Sprague-Dawley rat (RASMC) culture was done using the different levels of AGEs stimulation in the presence or absence of statin. The proliferation of RASMC, ROS formation and cellular signaling was evaluated and neointimal formation after balloon injury in diabetic rats was analyzed. Increasing concentration of AGEs stimulation was associated with increased RASMC proliferation and increased ROS formation and they were decreased with statin in a dose-dependent manner. Increased NF-kappaB p65, phosphorylated ERK, phosphorylated p38 MAPK, cyclooxygenase-2, and c-jun by AGEs stimulation were noted and their expression was inhibited by statin. Neointimal formation after balloon injury was much thicker in diabetic rats than the sham-treated group but less neointimal growth was observed in those treated with statin after balloon injury. Increased ROS formation, subsequent activation of MAPK system and increased VSMC proliferation may be possible mechanisms of diabetic vasculopathy induced by AGEs and statin may play a key role in the treatment of AGEs-induced diabetic atherosclerosis.
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Affiliation(s)
- Se-Jung Yoon
- Cardiology Division, National Health Insurance Corporation, Ilsan Hospital, Goyang 410-719, Korea
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Son JS, Jun SY, Kim EB, Park JE, Paik HR, Yoon SJ, Kang SH, Choi YJ. Complete genome sequence of a newly isolated lytic bacteriophage, EFAP-1 of Enterococcus faecalis, and antibacterial activity of its endolysin EFAL-1. J Appl Microbiol 2009; 108:1769-79. [PMID: 19863688 DOI: 10.1111/j.1365-2672.2009.04576.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
AIMS In this work, we aimed to identify an effective treatment of infections caused by Enterococcus spp. strains resistant to conventional antibiotics. METHODS AND RESULTS We report the isolation and characterization of a new lytic bacteriophage, designated bacteriophage EFAP-1, that is capable of lysing Enterococcus faecalis bacteria that exhibit resistance to multiple antibiotics. EFAP-1 has low sequence similarity to all known bacteriophages. Transmission electron microscopy confirmed that EFAP-1 belongs to the Siphoviridae family. A putative lytic protein of EFAP-1, endolysin EFAL-1, is encoded in ORF 2 and was expressed in Escherichia coli. Recombinant EFAL-1 had broad-spectrum lytic activity against several Gram-positive pathogens, including Ent. faecalis and Enterococcus faecium. CONCLUSIONS The complete genome sequence of the newly isolated enterococcal lytic phage was analysed, and it was demonstrated that its recombinant endolysin had broad lytic activity against various Gram-positive pathogens. SIGNIFICANCE AND IMPACT OF THE STUDY Bacteriophage EFAP-1 and its lytic protein, EFAL-1, can be utilized as potent antimicrobial agents against Enterococcus spp. strains resistant to conventional antibiotics in hospital infections and also as environmental disinfectants to control disease-causing Enterococcus spp. in dairy farms.
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Affiliation(s)
- J S Son
- Laboratory of Animal Cell Biotechnology, Department of Agricultural Biotechnology, Seoul National University, Seoul, Korea
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