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Choi Y, Kwak D, Lee H, Hur W, Cho W, Sung G, Kim T, Kim S, Yun S. Prostate Intrafraction Motion During Image Guided Radiation Therapy After Rectal Emptying. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.1784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kim H, Kim SK, Lee MK, Yun S, Song Y, Kim KR, Shin H, Lee H. Effects of ion beam-irradiated Si on atomic force microscope local oxidation. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.02.054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Saiju R, Yun S, Yoon PD, Shrestha MK, Shrestha UD. Bruckner Red Light Reflex Test in a Hospital Setting. ACTA ACUST UNITED AC 2013; 10:23-6. [DOI: 10.3126/kumj.v10i2.7338] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Background Childhood blindness is a major problem in developing world including Nepal that needs to be addressed. Objective The objective of study was to measure the effectiveness of the Bruckner red reflex test for screening of posterior segment opacities in children. Methods Patients aged less than five years who came to the Tilganga Institute of Ophthalmology, Kathmandu from March to August, 2009 were recruited in this cross-sectional descriptive study. Children were screened with the Bruckner red light reflex test in a dark room. Patients with abnormal Bruckner tests had their eyes dilated for further investigations. Abnormalities were recorded. The number of patients with an abnormal Bruckner test was recorded and correlated with their potential pathology. Results A total of 172 patients with 97 boys and 75 girls were included. Twenty-three had abnormal Bruckner test results in either one or both eyes. Four of these twenty-three patients had no pathology diagnosed; hence the sensitivity of the Bruckner screen to diagnose significant pathology was calculated at 82.6%. Of the 153 patients with normal results, two patients were found to have pathology detected, which included cataract and strabismus. Hence, the specificity of this test was 98.7%. The screening test had a positive predictive value of 90.5% and a negative predictive value of 97.4%. Conclusion Bruckner test screening is a sensitive and specific marker for detecting the posterior segment opacities in children. We recommend utilizing the test to evaluate these problems where other technologies are rare. Kathmandu University Medical Journal | Vol.10 | No. 2 | Issue 38 | Apr – June 2012 | Page 23-26 DOI: http://dx.doi.org/10.3126/kumj.v10i2.7338
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Ahn H, Shin H, Yun S, Kim J, Choi J. Measurement of bioimpedance and cell viability during ischemia-reperfusion in the rat liver. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2012; 2005:1945-7. [PMID: 17282602 DOI: 10.1109/iembs.2005.1616833] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
During liver resection and liver transplant, liver is damaged by ischemia-reperfusion injury. Until now, there is no approved method to measure or predict the extent of liver injury during the operation. This is the preliminary study to make the real time monitoring system by quantification of bioimpedance and ischemiareperfusion reperfusion injury in liver. Sprague-Dawley rats were subjected to different periods of 70% partial hepatic ischemia (30, 60, 90 and 120minutes ischemia) and reperfusion. We measured changes of liver tissue bioimpedance (120Hz-100KHz) every five minutes. Cell viability was assessed by metabolic capacity of fatty acid (palmitic acid metabolic rate), ATP content and histological examination (H/E and TUNEL stain) at every 30 minutes interval during ischemia.
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Kapur SK, Wang X, Shang H, Yun S, Li X, Feng G, Khurgel M, Katz AJ. Human adipose stem cells maintain proliferative, synthetic and multipotential properties when suspension cultured as self-assembling spheroids. Biofabrication 2012; 4:025004. [PMID: 22522924 DOI: 10.1088/1758-5082/4/2/025004] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Adipose-derived stromal/stem cells (ASCs) have been gaining recognition as an extremely versatile cell source for tissue engineering. The usefulness of ASCs in biofabrication is further enhanced by our demonstration of the unique properties of these cells when they are cultured as three-dimensional cellular aggregates or spheroids. As described herein, three-dimensional formulations, or self-assembling ASC spheroids develop their own extracellular matrix that serves to increase the robustness of the cells to mechanical stresses. The composition of the extracellular matrix can be altered based on the external environment of the spheroids and these constructs can be grown in a reproducible manner and to a consistent size. The spheroid formulation helps preserve the viability and developmental plasticity of ASCs even under defined, serum-free media conditions. For the first time, we show that multiple generations of adherent ASCs produced from these spheroids retain their ability to differentiate into multiple cell/tissue types. These demonstrated properties support the idea that culture-expanded ASCs are an excellent candidate cellular material for 'organ printing'-the approach of developing complex tissue structures from a standardized cell 'ink' or cell formulation.
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Lin C, Ningfu W, Xianhua Y, Jianmin Y, Guoxin T, Liang Z, Yun S. The value of ischaemia modified albumin in the detection of transient myocardial ischaemia induced by balloon dilation during percutaneous coronary intervention (PCI). BRITISH HEART JOURNAL 2011. [DOI: 10.1136/heartjnl-2011-300867.392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Lin C, Ningfu W, Xianhua Y, Jianmin Y, Guoxin T, Liang Z, Yun S. The ischaemic preconditioning effect of saccule predilation. BRITISH HEART JOURNAL 2011. [DOI: 10.1136/heartjnl-2011-300867.393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Krakow T, Hara W, Yun S, Soltys S, Chang S, Fischbein N, Loo B, Le Q. Clinical Management of Patients with Temporal Lobe Necrosis. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hara W, Yun S, Hsu A, Soltys S, Adler J, Le Q, Loo B. Can Temporal Lobe Necrosis be Prevented in Patients with Nasopharyngeal/Skull Base Tumors Undergoing a Stereotactic Radiosurgery Boost? A Dose Volume Analysis. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kim W, Kim Y, Yun S, Lee S, Kim W. UP-1.66: Correlation between serum parathyroid hormone and prostate size in patients with benign prostatic hyperplasia. Urology 2010. [DOI: 10.1016/j.urology.2010.07.199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kim B, Ahn Y, Park W, Chun H, Lee W, Yun S, Kang W, Park Y. Long-term Results of Adjuvant Pelvic Radiotherapy Concurrent with Chemotherapy following Simultaneous Rectal and Hepatic Resection in Patients with Rectal Cancer and Synchronous Liver Metastasis. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lee Y, Cho S, Kim J, Kwon J, Yun S, Yun H, Shin J. UP-1.193: A Comparison among Suprapubic Arc Sling, Transobturator Tape Placement and TVT-Secur® Operation in Women with Stress Urinary Incontinence. Urology 2009. [DOI: 10.1016/j.urology.2009.07.640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lee Y, Shin J, Cho S, Kim J, Kwon J, Yun S, Yun H. UP-2.030: Effects of Subclinical Prostatitis in Prostate Needle Biopsies on the Serum Prostate Specific Antigen: The Role of Pathology of Inflammation. Urology 2009. [DOI: 10.1016/j.urology.2009.07.249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Jee D, Lee D, Yun S, Lee C. Magnesium sulphate attenuates arterial pressure increase during laparoscopic cholecystectomy. Br J Anaesth 2009; 103:484-9. [PMID: 19617379 DOI: 10.1093/bja/aep196] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Magnesium is well known to inhibit catecholamine release and attenuate vasopressin-stimulated vasoconstriction. We investigated whether i.v. magnesium sulphate attenuates the haemodynamic stress responses to pneumoperitoneum by changing neurohumoral responses during laparoscopic cholecystectomy. METHODS Thirty-two patients undergoing laparoscopic cholecystectomy were randomly assigned to two groups; a control group was given saline, and a magnesium group received magnesium sulphate 50 mg kg(-1) immediately before pneumoperitoneum. Arterial pressure, heart rate, serum magnesium, plasma renin activity (PRA), and catecholamine, cortisol, and vasopressin levels were measured. RESULTS Systolic and diastolic arterial pressures were greater in the control group (P<0.05) than in the magnesium group at 10, 20, and 30 min post-pneumoperitoneum. Norepinephrine or epinephrine levels [pg ml(-1), mean (SD)] were higher in the control group than in the magnesium group at 5 [211 (37) vs 138 (18)] or 10 min [59 (19) vs 39 (9)] post-pneumoperitoneum, respectively (P<0.05). In the control group, vasopressin levels [pg ml(-1), mean (SD)] were higher compared with the magnesium group at 5 [64 (18) vs 35 (9), P<0.01] and 10 min [65 (18) vs 47 (11), P<0.05] post-pneumoperitoneum. There were no significant differences between the groups in PRA and cortisol levels. CONCLUSIONS I.V. magnesium sulphate before pneumoperitoneum attenuates arterial pressure increases during laparoscopic cholecystectomy. This attenuation is apparently related to reductions in the release of catecholamine, vasopressin, or both.
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Sattler KJ, Herrmann J, Yun S, Lehmann N, Wang Z, Heusch G, Sack S, Erbel R, Levkau B. High high-density lipoprotein-cholesterol reduces risk and extent of percutaneous coronary intervention-related myocardial infarction and improves long-term outcome in patients undergoing elective percutaneous coronary intervention. Eur Heart J 2009; 30:1894-902. [DOI: 10.1093/eurheartj/ehp183] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yun S, Gimotty P, Hwang W, Dawson P, VanBelle P, Elder D, Elenitsas R, Guerry D, Schuchter L, Xu X. The biology and prognostic value of lymphatic vessel density (LD) and lymphatic invasion (LI) in regression in melanoma. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.9017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
9017 Background: Regression in melanoma is characterized by increased vascularity, lymphocytic infiltrate and fibroplasia in the papillary dermis, accompanied by the absence (complete regression, CoR) or presence (partial regression, PaR) of melanoma cells in the epidermis. The prognostic value of regression is controversial. We noticed that LD and LI were increased in the areas of regression (AR) or areas with brisk lymphocytic infiltration (AB). Our goal was to clarify the prognostic value of regression in melanoma. Methods: Dual immunohistochemical staining was done using antibodies to podoplanin (lymphatic vessels) and S100 (melanoma cells) on paraffin tissues from 321 patients with vertical growth phase (VGP) primary melanomas who had 10 years or more of follow-up. LD in AR (both CoR and PaR) was compared with that of normal dermis adjacent and distant, as well as LD in the AB. LI in these areas was also scored. Unadjusted and adjusted hazard rates were obtained from univariate and multivariate Cox models for time to melanoma-specific death using established melanoma prognostic factors. Results: 116 patients (36%) had regression: 75 CoR (23%) and 41 PaR (13%). LD significantly decreased stepwise from CoR (mean ± se, 23.7 ± 2.7) to PaR (15.5 ± 1.1), adjacent normal dermis (7.3 ± 0.28) and distant normal dermis (5.4±0.31) and it was significantly elevated in the AB (18.5±0.78). Melanomas with CoR had the highest percentage of LI in both AR and AB. In addition, the percentage of LI in AB was highest for men and for those with VGP tumor infiltrating lymphocytes (TILs). Both high LD in AR and more LI in AB were associated with poor prognosis (p=0.004 and p=0.002, respectively). Six factors were significant in the final multivariate model: LI in AB (HR=2.3), LD in AR (HR=1.04), thickness (HR=1.44), axial (HR=7.7), ulceration (HR=2.5) and no VGP TILs (HR=2.8). Conclusions: AR and AB were associated with increased LD and higher incidence of LI in primary melanomas. LD and LI in AR or AB are independent prognostic factors. Our data suggest that the effects of regression on prognosis are mediated at least in part through lymphangiogenesis and LI. No significant financial relationships to disclose.
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Thompson DS, Spigel DR, Hainsworth JD, Jones SF, Burris HA, Sade L, Raefsky E, Greco FA, Yun S, Noursalehi M. Phase II trial of satraplatin (S) and paclitaxel (P) in first-line advanced non-small cell lung cancer (NSCLC) treatment: Final results. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.19023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Choy H, Hughes RS, Dimaio M, Tran T, Petrone M, Juvvadi S, Yun S, Schiller JH. Phase I study of oral platinum with concurrent radiation therapy in non small cell lung cancer. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.7560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Wisinski K, Mulcahy M, Kuzel TM, Benson AB, Agulnik M, MacVicar GR, Desai D, Yun S, Petrone M, Gradishar W. A phase I study of the oral platinum agent satraplatin (S) in with capecitabine (C) in patients (pts) with advanced solid malignancies. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.13554] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Kim YH, Hong S, Kim B, Yun S, Kang YR, Paek KK, Lee JW, Lee SH, Ju BK. Droplet-based magnetically activated cell separation. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2007; 2004:2575-8. [PMID: 17270800 DOI: 10.1109/iembs.2004.1403740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
In this study, we developed a method that target cells in suspension can be separated by combining magnetic force and gravitation force. Since the newly developed method involves a separating process of a droplet containing nontarget cells in suspension by applying magnetic force to separate target cells, we called it droplet-based magnetic activated cell sorting (dMACS). To demonstrate the efficiency of the dMACS system, Ter119 (+) cells from mouse bone marrow cells were separated by both conventional MACS and our dMACS systems. Effects of three parameters on separation efficiency were examined in the dMACS system. As a result, both volume of droplet of cell suspension, and magnetic force did not affect the efficiency of cell separation markedly. However, the time for cell settlement in the droplet showed a critical role in the efficiency of cell separation according to increasing time. Therefore, we tried to verify that the saturation time affected increase of its efficiency and that flow rate injected to get rid of the negative cell resulted in the decrease of its efficiency. Using this dMACS system, we were able to pinpoint that the flow rate of cell suspension injected into a magnetic platform results in disturbance in the droplet, leading to turbulence in the cell suspension.
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Noh J, Park W, Ahn Y, Nam H, Oh D, Chun H, Lee W, Yun S, Kang W, Park Y. 2180. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Yun S, Zhu BP, Black W, Brownson RC. A comparison of national estimates of obesity prevalence from the behavioral risk factor surveillance system and the national health and nutrition examination survey. Int J Obes (Lond) 2005; 30:164-70. [PMID: 16231026 DOI: 10.1038/sj.ijo.0803125] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Obesity interventions are implemented at state or sub-state level in the United States (US), where only self-reported weight and height data for adults are available from the Behavioral Risk Factor Surveillance System (BRFSS). The prevalence estimates of overweight and obesity generated from self-reported weight and height from BRFSS are known to underestimate the true prevalence. However, whether this underestimation is consistent across different demographic groups has not been fully investigated. METHODS In this study, we compared the prevalence estimates of obesity (body mass index (BMI) > or =30 kg/m(2)) and overweight (BMI > or =25 kg/m(2)) in different demographic groups in the US from the National Health and Nutrition Examination Survey (NHANES) and BRFSS during 1999-2000. We also compared the rank orders of the obesity and overweight prevalence across different demographic groups from the two data sources. RESULTS Compared to NHANES, BRFSS underestimated the overall prevalence of obesity and overweight by 9.5 and 5.7 percentage points, respectively. The underestimation differed across different demographic groups: the underestimation of obesity and overweight prevalence was higher among women (13.1 and 12.2 percentage points, respectively) than among men (5.8 and -0.6 percentage points, respectively). The variation of underestimation was higher among men. A clear inverse association between educational attainment and obesity prevalence among non-Hispanic African American women was observed from BRFSS data. However, no such association was found from NHANES. While BRFSS can identify correctly the population with the highest obesity and overweight burden, it did not accurately rank the obesity and overweight prevalence across different demographic groups. CONCLUSION Compared to NHANES, BRFSS disproportionately underestimates the prevalence of obesity and overweight across different gender, race, age, and education subgroups.
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Boudoux C, Yun S, Oh W, White W, Iftimia N, Shishkov M, Bouma B, Tearney G. Rapid wavelength-swept spectrally encoded confocal microscopy. OPTICS EXPRESS 2005; 13:8214-21. [PMID: 19498851 DOI: 10.1364/opex.13.008214] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Spectrally encoded confocal microscopy (SECM) is a technique that allows confocal microscopy to be performed through the confines of a narrow diameter optical fiber probe. We present a novel scheme for performing SECM in which a rapid wavelength swept source is used. The system allows large field of view images to be acquired at rates up to 30 frames/second. Images of resolution targets and tissue specimens acquired ex vivo demonstrate high lateral (1.4 mum) and axial (6 mum) resolution. Imaging of human skin was performed in vivo at depths of up to 350 mum, allowing cellular and sub-cellular details to be visualized in real time.
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Vakoc B, Yun S, de Boer J, Tearney G, Bouma B. Phase-resolved optical frequency domain imaging. OPTICS EXPRESS 2005; 13:5483-93. [PMID: 19498543 PMCID: PMC2705336 DOI: 10.1364/opex.13.005483] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Phase-resolved Doppler optical coherence tomography has been used to image blood flow dynamics in various tissues using both time-domain and spectral-domain optical coherence tomography techniques. In this manuscript, we present phase-resolved Doppler imaging with a high-speed optical frequency domain imaging system. We demonstrate that by correcting for spurious timing-induced phase errors, excellent flow sensitivity can be achieved, limited only by the imaging signal-to-noise ratio. Conventional and Doppler images showing flow in an Intralipid phantom and in human skin are presented. Additionally, we demonstrate the ability of phase-resolved OFDI to measure high flow rates without the deleterious effects of fringe washout.
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Bae S, Ryoo H, Kim K, Hyun D, Lee S, Yei J, Bae J, Yun S, Lee K, Hyun M. P-192 Concurrent chemoradiotherapy (CCRT) with paclitaxel followed by paclitaxel and carboplatin consolidation in patients with inoperable stage III non-small cell lung cancer (NSCLC). Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)80686-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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