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Wang DH, Ku JY, Jung DH, Lee KS, Shin WC, Yang BD, Park JY. Impact of Iterative Deuterium Annealing in Long-Channel MOSFET Performance. Materials 2022; 15:ma15051960. [PMID: 35269192 PMCID: PMC8912009 DOI: 10.3390/ma15051960] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 02/28/2022] [Accepted: 03/04/2022] [Indexed: 02/05/2023]
Abstract
In contrast to conventional forming gas annealing (FGA), high-pressure deuterium annealing (HPD) shows a superior passivation of dangling bonds on the Si/SiO2 interface. However, research detailing the process optimization for HPD has been modest. In this context, this paper demonstrates the iterative impact of HPD for the better fabrication of semiconductor devices. Long-channel gate-enclosed FETs are fabricated as a test vehicle. After each cycle of the annealing, device parameters are extracted and compared depending on the number of the HPD. Based on the results, an HPD condition that maximizes on-state current (ION) but minimizes off-state current (IOFF) can be provided.
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Affiliation(s)
- Dong-Hyun Wang
- School of Electronics Engineering, Chungbuk National University, Cheongju 28644, Korea; (D.-H.W.); (J.-Y.K.); (D.-H.J.); (K.-S.L.); (B.-D.Y.)
| | - Ja-Yun Ku
- School of Electronics Engineering, Chungbuk National University, Cheongju 28644, Korea; (D.-H.W.); (J.-Y.K.); (D.-H.J.); (K.-S.L.); (B.-D.Y.)
| | - Dae-Han Jung
- School of Electronics Engineering, Chungbuk National University, Cheongju 28644, Korea; (D.-H.W.); (J.-Y.K.); (D.-H.J.); (K.-S.L.); (B.-D.Y.)
| | - Khwang-Sun Lee
- School of Electronics Engineering, Chungbuk National University, Cheongju 28644, Korea; (D.-H.W.); (J.-Y.K.); (D.-H.J.); (K.-S.L.); (B.-D.Y.)
| | - Woo Cheol Shin
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea;
| | - Byung-Do Yang
- School of Electronics Engineering, Chungbuk National University, Cheongju 28644, Korea; (D.-H.W.); (J.-Y.K.); (D.-H.J.); (K.-S.L.); (B.-D.Y.)
| | - Jun-Young Park
- School of Electronics Engineering, Chungbuk National University, Cheongju 28644, Korea; (D.-H.W.); (J.-Y.K.); (D.-H.J.); (K.-S.L.); (B.-D.Y.)
- Correspondence:
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2
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Je SG, Thian D, Chen X, Huang L, Jung DH, Chao W, Lee KS, Hong JI, Soumyanarayanan A, Im MY. Targeted Writing and Deleting of Magnetic Skyrmions in Two-Terminal Nanowire Devices. Nano Lett 2021; 21:1253-1259. [PMID: 33481614 DOI: 10.1021/acs.nanolett.0c03686] [Citation(s) in RCA: 1] [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] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Controllable writing and deleting of nanoscale magnetic skyrmions are key requirements for their use as information carriers for next-generation memory and computing technologies. While several schemes have been proposed, they require complex fabrication techniques or precisely tailored electrical inputs, which limits their long-term scalability. Here, we demonstrate an alternative approach for writing and deleting skyrmions using conventional electrical pulses within a simple, two-terminal wire geometry. X-ray microscopy experiments and micromagnetic simulations establish the observed skyrmion creation and annihilation as arising from Joule heating and Oersted field effects of the current pulses, respectively. The unique characteristics of these writing and deleting schemes, such as spatial and temporal selectivity, together with the simplicity of the two-terminal device architecture, provide a flexible and scalable route to the viable applications of skyrmions.
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Affiliation(s)
- Soong-Geun Je
- Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
- Department of Physics, Chonnam National University, Gwangju 61186, Korea
| | - Dickson Thian
- Institute of Materials Research and Engineering, Agency for Science, Technology, and Research, 138634 Singapore
| | - Xiaoye Chen
- Institute of Materials Research and Engineering, Agency for Science, Technology, and Research, 138634 Singapore
- Data Storage Institute, Agency for Science, Technology, and Research, 138634 Singapore
| | - Lisen Huang
- Institute of Materials Research and Engineering, Agency for Science, Technology, and Research, 138634 Singapore
- Data Storage Institute, Agency for Science, Technology, and Research, 138634 Singapore
| | - Dae-Han Jung
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Weilun Chao
- Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Ki-Suk Lee
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Jung-Il Hong
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
| | - Anjan Soumyanarayanan
- Institute of Materials Research and Engineering, Agency for Science, Technology, and Research, 138634 Singapore
- Data Storage Institute, Agency for Science, Technology, and Research, 138634 Singapore
- Department of Physics, National University of Singapore, 117551 Singapore
| | - Mi-Young Im
- Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
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Kwon JH, Song GW, Hwang S, Kim KH, Ahn CS, Moon DB, Ha TY, Jung DH, Park GC, Kim SH, Kang WH, Cho HD, Jwa EK, Tak EY, Kirchner VA, Lee SG. Dual-graft adult living donor liver transplantation with ABO-incompatible graft: short-term and long-term outcomes. Am J Transplant 2018; 18:424-433. [PMID: 28758336 DOI: 10.1111/ajt.14448] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 07/02/2017] [Accepted: 07/20/2017] [Indexed: 01/25/2023]
Abstract
ABO-incompatible (ABOi) dual-graft (DG) adult living donor liver transplantation (ALDLT) is not commonly performed due to its inherently intricate surgical technique and immunological complexity. Therefore, data are lacking on the short- and long-term clinical outcomes of ABOi DG ALDLT. We performed a retrospective study by reviewing the medical records of patients who underwent ABOi DG ALDLT between 2008 and 2014. Additionally, computed tomography volumetric analysis was conducted to assess the graft regeneration rate. The mean age of a total of 28 recipients was 50.2 ± 8.5 years, and the mean model for end-stage liver disease score was 12.2 ± 4.6. The 1-, 3-, and 5-year patient survival rate was 96.4% during the mean follow-up period of 57.0 ± 22.4 months. The 1-, 3-, and 5-year graft survival rate was 96.4%, 94.2%, and 92.0%, respectively, and no significant differences were observed between ABO-compatible (ABOc) and ABOi grafts (P = .145). The biliary complication rate showed no significant difference (P = .195) between ABOc and ABOi grafts. Regeneration rates of ABOi grafts were not significantly different from those of ABOc grafts. DG ALDLT with ABOi and ABOc graft combination seems to be a feasible option for expanding the donor pool without additional donor risks.
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Affiliation(s)
- J H Kwon
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G W Song
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S Hwang
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - K H Kim
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - C S Ahn
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D B Moon
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - T Y Ha
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D H Jung
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G C Park
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S H Kim
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - W H Kang
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - H D Cho
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - E K Jwa
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - E Y Tak
- Asan Institute for Life Sciences and Asan-Minnesota Institute for Innovating Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - V A Kirchner
- Division of Transplantation, Department of Surgery and Asan-Minnesota Institute for Innovating Transplantation, University of Minnesota, Minneapolis, MN, USA
| | - S G Lee
- Division of Liver Transplantation and Hepatobiliary Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Kwon JH, Yoon YI, Song GW, Kim KH, Moon DB, Jung DH, Park GC, Tak EY, Kirchner VA, Lee SG. Living Donor Liver Transplantation for Patients Older Than Age 70 Years: A Single-Center Experience. Am J Transplant 2017; 17:2890-2900. [PMID: 28510341 DOI: 10.1111/ajt.14355] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [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: 12/22/2016] [Revised: 05/01/2017] [Accepted: 05/04/2017] [Indexed: 01/25/2023]
Abstract
Over the past two decades, the age of liver transplantation (LT) recipients has been increasing. We reviewed our experience with LT for patients aged ≥70 years (range: 70-78 years) and investigated the feasibility of performing LT, especially living donor LT (LDLT), for older patients. We retrospectively reviewed the medical records of 25 patients (15 LDLT recipients, 10 deceased donor LT recipients) aged ≥70 years who underwent LT from January 2000 to April 2016. Their perioperative morbidity rate was 28.0%, and the in-hospital mortality rate was 16.0%; these results were comparable to those of matched patients in their 60s (n = 73; morbidity, p = 0.726; mortality, p = 0.816). For patients in their 70s, the 1- and 5-year patient survival rates were 84.0% and 69.8%, and the 1- and 5-year graft survival rates were 83.5% and 75.1%, respectively. Comparisons of patient and graft survival rates between matched patients in their 60s and 70s showed no statistically significant differences (patient survival, p = 0.372; graft survival, p = 0.183). Our experience suggests that patients aged ≥70 years should not be excluded from LT, or even LDLT, based solely on age and implies that careful selection of recipients and donors as well as meticulous surgical technique are necessary for successful results.
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Affiliation(s)
- J H Kwon
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Y I Yoon
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Korea University Medical Center, University of Korea College of Medicine, Seoul, Korea
| | - G W Song
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - K H Kim
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D B Moon
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D H Jung
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G C Park
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - E Y Tak
- Asan Institute for Life Sciences and Asan-Minnesota Institute for Innovating Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - V A Kirchner
- Division of Transplantation, Department of Surgery and Asan-Minnesota Institute for Innovating Transplantation, University of Minnesota, Minneapolis, MN
| | - S G Lee
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Lee HJ, Jung DH, Kil TH, Kim SH, Lee KS, Baek SH, Choi WJ, Baik JM. Mechanically Robust, Stretchable Solar Absorbers with Submicron-Thick Multilayer Sheets for Wearable and Energy Applications. ACS Appl Mater Interfaces 2017; 9:18061-18068. [PMID: 28488438 DOI: 10.1021/acsami.7b03741] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A facile method to fabricate a mechanically robust, stretchable solar absorber for stretchable heat generation and an enhanced thermoelectric generator (TEG) is demonstrated. This strategy is very simple: it uses a multilayer film made of titanium and magnesium fluoride optimized by a two-dimensional finite element frequency-domain simulation, followed by the application of mechanical stresses such as bending and stretching to the film. This process produces many microsized sheets with submicron thickness (∼500 nm), showing great adhesion to any substrates such as fabrics and polydimethylsiloxane. It exhibits a quite high light absorption of approximately 85% over a wavelength range of 0.2-4.0 μm. Under 1 sun illumination, the solar absorber on various stretchable substrates increased the substrate temperature to approximately 60 °C, irrespective of various mechanical stresses such as bending, stretching, rubbing, and even washing. The TEG with the absorber on the top surface also showed an enhanced output power of 60%, compared with that without the absorber. With an incident solar radiation flux of 38.3 kW/m2, the output power significantly increased to 24 mW/cm2 because of the increase in the surface temperature to 141 °C.
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Affiliation(s)
- Hye Jin Lee
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - Dae-Han Jung
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - Tae-Hyeon Kil
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
- Department of Materials Science and Engineering, Seoul National University (SNU) , Seoul 08826, Republic of Korea
| | - Sang Hyeon Kim
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
| | - Ki-Suk Lee
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - Seung-Hyub Baek
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
| | - Won Jun Choi
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
| | - Jeong Min Baik
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea
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Jung DH, Hwang S, Song GW, Ahn CS, Moon DB, Ha TY, Kim KH, Park GC, Kim BS, Park IJ, Lim SB, Kim JC, Yoo MW, Byeon JS, Jung HY, Lee GH, Myung SJ, Choe J, Choi JY, Park HW, Lee SG. Survival Benefit of Early Cancer Detection Through Regular Endoscopic Screening for De Novo Gastric and Colorectal Cancers in Korean Liver Transplant Recipients. Transplant Proc 2016; 48:145-51. [PMID: 26915860 DOI: 10.1016/j.transproceed.2015.12.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 12/10/2015] [Indexed: 02/07/2023]
Abstract
BACKGROUND De novo malignancy is not uncommon after liver transplantation (LT). Gastric cancer is one of the most common malignancies in both the Korean general population and LT recipients, and colorectal cancer prevalence is gradually increasing. METHODS Among 3690 adult recipients who underwent LT from January 1999 and December 2013, the screening patterns and prognosis of 26 cases of gastric cancer and 22 cases of colorectal cancer were analyzed. RESULTS For gastric cancer, the mean patient age was 54.6 ± 6.2 years at LT and 59.5 ± 6.7 years at cancer diagnosis, with a post-transplant interval of 60.2 ± 29.8 months. Patients were divided into regular (n = 18) and non-regular (n = 8) screening groups, with early cancer found in 14 and 0 patients; their 2-year survival rates after cancer diagnosis were 93.1% and 33.3% (P = .006), respectively. Endoscopic resection was successfully performed in 8 patients, all in the regular screening group. For colorectal cancer, the mean patient age was 53.3 ± 6.1 years at LT and 58.1 ± 6.7 years at cancer diagnosis, with a post-transplant interval of 54.3 ± 38.0 months. Patients were divided into regular (n = 19) and non-regular (n = 3) screening groups, with early cancer found in 12 and 0 patients; their 2-year survival rates after cancer diagnosis of 92.3% and 33.3% (P = .003), respectively. Endoscopic resection was successfully performed in 6 patients, all in the regular screening group. CONCLUSIONS LT recipients are strongly advised to undergo regular screening studies for various de novo malignancies, especially cancers common in the general population. Regular endoscopic screening contributes to the timely detection of gastric and colorectal cancers, improving post-treatment survival outcomes.
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Affiliation(s)
- D H Jung
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S Hwang
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
| | - G W Song
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - C S Ahn
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D B Moon
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - T Y Ha
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - K H Kim
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G C Park
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - B S Kim
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - I J Park
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S B Lim
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - J C Kim
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - M W Yoo
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - J S Byeon
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - H Y Jung
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G H Lee
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S J Myung
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - J Choe
- Health Screening and Promotion Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - J Y Choi
- Health Screening and Promotion Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - H W Park
- Health Screening and Promotion Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S G Lee
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
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7
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Kang WH, Hwang S, Song GW, Jung DH, Kim KH, Park GC, Ha TY, Ahn CS, Moon DB, Yoon YI, Shin MH, Kim WJ, Kim SH, Lee SG. Donor Safety and Recipient Liver Function After Right-Lobe Liver Transplantation From Living Donors With Gilbert Syndrome. Transplant Proc 2016; 47:2827-30. [PMID: 26707296 DOI: 10.1016/j.transproceed.2015.10.050] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2015] [Accepted: 10/28/2015] [Indexed: 02/02/2023]
Abstract
BACKGROUND Donor safety is the most important aspect in living-donor liver transplantation (LDLT). Gilbert syndrome is an autosomal recessive condition that is a common cause of isolated unconjugated hyperbilirubinemia, and its prevalence is not negligibly low in the general population. This study intended to assess donor safety and recipient liver function after LDLT with the use of right liver grafts from living donors with Gilbert syndrome. METHODS Among 2,140 right liver transplantations performed from January 2002 to December 20113 at our institution, we identified 12 living donors (0.6%) who showed a preoperative serum total bilirubin level of ≥2 mg/dL. These donors were clinically diagnosed with Gilbert syndrome. The clinical outcomes of these donors and their recipients were analyzed retrospectively. RESULTS The mean donor age was 24.6 ± 7.1 years, and 11 donors were male. All subjects met the preoperative evaluation conditions for right liver donation except for the level of unconjugated hyperbilirubinemia. The mean serum total bilirubin level of the donors was 2.23 ± 0.20 mg/dL before and 1.79 ± 0.61 mg/dL 1 year after right liver donation. The preoperative donor direct bilirubin level was 0.43 ± 0.19 mg/dL. The preoperative indocyanine green retention rate at 15 minutes was 8.2 ± 2.8%. All donors and recipients recovered uneventfully and were alive at the time of writing. The recipient serum total bilirubin level was 1.29 ± 0.47 mg/dL 1 year after LDLT. CONCLUSIONS We suggest that LDLT with living donors with Gilbert syndrome can be safely performed, but that a meticulous preoperative evaluation is vital to maximize donor safety.
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Affiliation(s)
- W H Kang
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S Hwang
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
| | - G W Song
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D H Jung
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - K H Kim
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G C Park
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - T Y Ha
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - C S Ahn
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D B Moon
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Y I Yoon
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - M H Shin
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - W J Kim
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S H Kim
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S G Lee
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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8
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Rhee K, Kim JH, Jung DH, Han JW, Lee YC, Lee SK, Shin SK, Park JC, Chung HS, Park JJ, Youn YH, Park H. Self-expandable metal stents for malignant esophageal obstruction: a comparative study between extrinsic and intrinsic compression. Dis Esophagus 2016; 29:224-8. [PMID: 25708695 DOI: 10.1111/dote.12325] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Self-expandable metal stents (SEMSs) are effective for malignant esophageal obstruction, but usefulness of SEMSs in extrinsic lesions is yet to be elucidated. This study is aimed at evaluating the clinical usefulness of SEMSs in the extrinsic compression compared with intrinsic. A retrospective review was conducted for 105 patients (intrinsic, 85; extrinsic, 20) with malignant esophageal obstruction who underwent endoscopic SEMSs placement. Technical and clinical success rates were evaluated and clinical outcomes were compared between extrinsic and intrinsic group. Extrinsic group was mostly pulmonary origin. Overall technical and clinical success rate was 100% and 91%, respectively, without immediate complications. Extrinsic and intrinsic group did not differ significantly in clinical success rate. The median stent patency time was 131.3 ± 85.8 days in intrinsic group while that of extrinsic was 54.6 ± 45.1 due to shorter survival after stent insertion. The 4-, 8-, and 12-week patency rates were 90.5%, 78.8%, and 64.9% respectively in intrinsic group, while stents of extrinsic group remained patent until death. Uncovered, fully covered, and double-layered stent were used evenly and the types did not influence patency in both groups. In conclusion, esophageal SEMSs can safely and effectively be used for malignant extrinsic compression as well as intrinsic.
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Affiliation(s)
- K Rhee
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.,Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - J-H Kim
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.,Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - D H Jung
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - J W Han
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.,Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Y C Lee
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - S K Lee
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - S K Shin
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - J C Park
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - H S Chung
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - J J Park
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.,Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Y H Youn
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.,Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - H Park
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.,Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
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Lee HJ, Lee JW, Kim HJ, Jung DH, Lee KS, Kim SH, Geum DM, Kim CZ, Choi WJ, Baik JM. Optical design of ZnO-based antireflective layers for enhanced GaAs solar cell performance. Phys Chem Chem Phys 2016; 18:2906-12. [PMID: 26732237 DOI: 10.1039/c5cp06274h] [Citation(s) in RCA: 5] [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: 11/21/2022]
Abstract
A series of hierarchical ZnO-based antireflection coatings with different nanostructures (nanowires and nanosheets) is prepared hydrothermally, followed by means of RF sputtering of MgF2 layers for coaxial nanostructures. Structural analysis showed that both ZnO had a highly preferred orientation along the 〈0001〉 direction with a highly crystalline MgF2 shell coated uniformly. However, a small amount of Al was present in nanosheets, originating from Al diffusion from the Al seed layer, resulting in an increase of the optical bandgap. Compared with the nanosheet-based antireflection coatings, the nanowire-based ones exhibited a significantly lower reflectance (∼2%) in ultraviolet and visible light wavelength regions. In particular, they showed perfect light absorption at wavelength less than approximately 400 nm. However, a GaAs single junction solar cell with nanosheet-based antireflection coatings showed the largest enhancement (43.9%) in power conversion efficiency. These results show that the increase of the optical bandgap of the nanosheets by the incorporation of Al atoms allows more photons enter the active region of the solar cell, improving the performance.
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Affiliation(s)
- Hye Jin Lee
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.
| | - Jae Won Lee
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.
| | - Hee Jun Kim
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.
| | - Dae-Han Jung
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.
| | - Ki-Suk Lee
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.
| | - Sang Hyeon Kim
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology, Seoul, 136-791, Korea.
| | - Dae-myeong Geum
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology, Seoul, 136-791, Korea.
| | - Chang Zoo Kim
- Nano Process Division Korea Advanced Nano Fab Center, Gyeonggi-do 443-270, Korea
| | - Won Jun Choi
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology, Seoul, 136-791, Korea.
| | - Jeong Min Baik
- School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.
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Lee SG, Moon DB, Hwang S, Ahn CS, Kim KH, Song GW, Jung DH, Ha TY, Park GC, Jung BH. Liver transplantation in Korea: past, present, and future. Transplant Proc 2015; 47:705-8. [PMID: 25891715 DOI: 10.1016/j.transproceed.2015.02.015] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 02/25/2015] [Indexed: 10/23/2022]
Abstract
PURPOSE This study reviewed the past and present status of liver transplantation (LT) and outlooks for the future of LT in Korea. METHOD The first LT in Korea was successfully performed using a deceased donor graft in 1988. Pediatric and adult living donor liver transplantations (LDLTs) were initiated in 1994 and 1997, respectively. From 1988 to 2013, 10,581 LTs were performed at 40 centers, whereas LDLT accounted for 76.5% of all LTs. RESULTS In the early 1990s, the deceased organ donation rate was less than 1.5 per million population (PMP) per year, but it increased to 5 PMP beginning in 2008. Despite the increasing number of deceased donor liver transplantations (DDLTs), high prevalence of hepatitis B virus (HBV)-induced cirrhosis and hepatocellular carcinoma (HCC) has provoked persistent performance of adult LDLT with technical advancement including middle hepatic vein (MHV) reconstruction of right lobe graft and dual graft LDLT with 1 nationwide donor mortality. CONCLUSION The number of LTs in Korea in 2010 was 23.2 PMP (1042 LTs/45 million population), lower than 23.5 PMP of Spain, but higher than 20 PMP of the United States. However, future LT numbers may decrease because of lowering the HBV carrier rate (neonatal HBV universal vaccination began in 1992), new potent anti-HBV agents, and lowest birth rate (1.22 children per family) with a decrease of potential live donors.
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Affiliation(s)
- S G Lee
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
| | - D B Moon
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S Hwang
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - C S Ahn
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - K H Kim
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G W Song
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D H Jung
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - T Y Ha
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G C Park
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - B H Jung
- Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Namgoong JM, Hwang S, Ahn CS, Kim KH, Moon DB, Ha TY, Song GW, Jung DH, Park GC, Park HW, Park CS, Park YH, Kang SH, Jung BH, Lee SG. A pilot study on the safety and efficacy of generic mycophenolate agent as conversion maintenance therapy in stable liver transplant recipients. Transplant Proc 2014; 45:3035-7. [PMID: 24157030 DOI: 10.1016/j.transproceed.2013.08.026] [Citation(s) in RCA: 6] [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: 11/24/2022]
Abstract
PURPOSE The patent covering mycophenolate mofetil (MMF) in Korea has expired and, thus, several generic MMF agents are now commercially available. The supply of Cellcept (Roche Korea) was interrupted at the end of 2011, so it was inevitable that a generic MMF would be used instead. During this period, we performed a prospective pilot study to examine the safety and efficacy of a generic mycophenolate agent (Myconol: Hanmi Pharmaceutical, Seoul Korea) for use as conversion maintenance therapy in stable liver transplantation (OLT) recipients. METHODS OLT recipients, who were treated with MMF on an outpatient basis from January 2012 to March 2012, attended follow-up interviews conducted. The patients had undergone OLT ≥ 2 years before the study, had tolerated Cellcept, and showed stable liver function. Fifty-three patients were followed up for more than 3 months after conversion to the same dose of Myconol. RESULTS After conversion to Myconol, 6 patients (11.3%) experienced new side effects, which disappeared when they reverted to Cellcept (n = 5) or stopped taking Myconol medication (n = 1). The side effects associated with Myconol included gastrointestinal symptoms (indigestion and diarrhea; n = 3), skin eruptions (n = 1), pruritus (n = 1), and insomnia (n = 1). The mean mycophenolic acid levels were 1.71 ± 0.88 μg/mL for Cellcept and 1.83 ± 0.91 μg/mL for Myconol, which showed a strong correlation (r(2) = 0.92, P < .001). CONCLUSIONS Myconol showed similar pharmacokinetics to those of Celcept, but a small proportion of patients experienced agent-specific side effects; therefore, patients should be closely monitored when taking Myconol. Also, further studies, with a greater number of patients, are required to identify the full spectrum of drug-associated side effects.
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Affiliation(s)
- J M Namgoong
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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12
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Moon DB, Lee SG, Hwang S, Kim KH, Ahn CS, Ha TY, Song GW, Jung DH, Park GC, Namkoong JM, Park HW, Park YH, Park CS. Toward more than 400 liver transplantations a year at a single center. Transplant Proc 2014; 45:1937-41. [PMID: 23769078 DOI: 10.1016/j.transproceed.2012.12.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2012] [Accepted: 12/04/2012] [Indexed: 12/30/2022]
Abstract
BACKGROUND For the first time at Asan Medical Center (AMC) we performed more than 400 liver transplantations (LTs) per year in 2011, despite same number of living donor liver transplantations (LDLTs). METHODS Our OLT program was started in 1992, but not activated well due to the scarcity of deceased donor organs. Since adult LDLTs using a left lobe and then a right lobe were successfully performed in 1997, we have developed several innovative techniques and approaches for adult LDLT, for example, modified right-lobe graft reconstructing middle hepatic branches in 1998, dual graft LDLT using 2 left lobes in 2000; new criteria for hepatocellular carcinoma (HCC); as well as ABO-incompatible LDLT, the first in the world. As a result, the number of LDLTs has increased rapidly but reached a plateau recently. Nationwide efforts to promote deceased donation increased the number of deceased donor liver transplantation (DDLT). RESULTS We have performed 317 LDLTs per year in 2010 and 2011, respectively. The number of LTs reached 403 in 2011. This large number was possible due to a remarkable increase of DDLTs from 50 in 2010 to 86 in 2011. Seventy-nine patients (68.1%) among 116 patients (28.8%) required an urgent LT receiving a DDLT. LT for HCC or ABO-mismatch comprised 50.3% (n = 150) or 8.7% (n = 35), respectively. In-hospital mortality rate in 2011 was 4.7%. CONCLUSIONS The increased LTs number at AMC was aided by the nationwide campaign.
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Affiliation(s)
- D B Moon
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Kim YS, Sohn E, Jung DH, Lee YM, Kim CS, Kim J, Kim JS. Expression of heat shock protein 90 in the kidneys of diabetic db/db mice. Eur Rev Med Pharmacol Sci 2014; 18:2198-2204. [PMID: 25070827] [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] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To identify novel genes regulated in diabetic nephropathy. MATERIALS AND METHODS Total RNA from the renal cortex of db/+ and db/db mice was isolated and DNA microarrays specific for diabetes signaling pathways were used for expression profiling. Expression of mRNA and protein was determined by RT-PCR and western blotting. The terminal deoxynucleotidyl transferase-mediated biotinylated UTP nick-end labeling (TUNEL) assay and immunohistochemical staining were assessed in renal cortex of db/db mice. RESULTS Microarray data revealed that 7 genes show up- or down-regulated pattern and diabetic mice specifically decreased heat shock protein (Hsp) 90α expression of genes compared to control mice (diabetic mice 0.68 vs. control mice 1 relative density). Expression of Hsp90α mRNA and Hsp90 protein was significantly decreased in the renal cortex of diabetic mice. However, Hsp70 mRNA and protein expression was not changed. Apoptosis was increased in glomeruli of diabetic mice due to increased expression of cleaved caspase-3 and Bax. CONCLUSIONS Our results suggest that Hsp 90 expression was decreased in diabetic glomeruli and decreased Hsp90 expression may mediate podocyte apoptosis in type 2 diabetic kidneys.
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Affiliation(s)
- Y S Kim
- Korean Medicine-Based Herbal Drug Development Group, Herbal Medicine Research Division, Korea Institute of Oriental Medicine (KIOM), Daejeon, Republic of Korea.
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Hwang S, Ahn CS, Kim KH, Moon DB, Ha TY, Song GW, Jung DH, Park GC, Namgoong JM, Yoon SY, Jung SW, Lee SG. Standardization of modified right lobe grafts to minimize vascular outflow complications for adult living donor liver transplantation. Transplant Proc 2012; 44:457-9. [PMID: 22410043 DOI: 10.1016/j.transproceed.2012.01.072] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND After >2000 adult living donor liver transplants (LDLTs), we observed minimization of the complication rate using case-by-case modification of venous outflow reconstruction in right liver graft (RLG), standardization seeking intend to provide a hemodynamic- based, regeneration-compliant hepatic outflow reconstruction. METHODS We retrospectively examined 100 consecutive adult LDLT using modified RLG before and after application of RLG standardization to compare the 6-month incidences of vascular outflow complications. RESULT The right hepatic vein stenting rate for first 6 months was 5% in the customized group and 1% in the standardized group (P=.212). The middle hepatic vein stenting rate for first 6 months was 9% in the customized group and 4% in the standardized group (P=.373). The inferior right hepatic vein stenting rate for first 6 months was 12.8% in the customized group and 7.1% in the standardized group (P=.472). The overall 6-month patient survival rate was 94% in the customized group and 95% in the standardized group (P=.867). The overall incidence of significant RLG venous outflow complications was 19% in the customized group and 8% in the standardized group (P=.023). CONCLUSION Standardization as a universal graft model seemed to be more effective and feasible than conventional graft customization requiring individualized case-by-case modification.
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Affiliation(s)
- S Hwang
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
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Park HW, Hwang S, Ahn CS, Kim KH, Moon DB, Ha TY, Song GW, Jung DH, Park GC, Namgoong JM, Yoon SY, Park CS, Park YH, Lee HJ, Lee SG. De novo malignancies after liver transplantation: incidence comparison with the Korean cancer registry. Transplant Proc 2012; 44:802-5. [PMID: 22483500 DOI: 10.1016/j.transproceed.2012.01.027] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
PURPOSE De novo malignancy is not uncommon after liver transplantation (OLT). We have compared the incidence of novo malignancy following OLT with those among the general Korean population. METHODS Between January 1998 and December 2008, 1952 adult OLT were performed, including 1714 living donor and 238 deceased donor grafts whose medical records were retrospectively reviewed. RESULTS Among the 1952 patients, 44 (2.3%) showed de novo malignancies after a mean posttransplant period of 41 months. Among the 14 types of malignancy the most frequent was stomach cancer (n = 11; 25.0%), colorectal cancer (n = 9; 20.5%), breast cancer (n = 4; 9.1%), and thyroid cancer (n = 3; 6.8%). These patients underwent aggressive treatment, including surgery, chemotherapy, and radiotherapy, except for one patient with an aggressive primary liver cancer. Over a mean follow-up of 45 months after diagnosis of de novo malignancy, 13 patients (29.5%) died; the overall 3-year patient survival rate was 67.5%. The relative risk of malignancy following OLT was 7.7-fold higher in men and 7.3-fold higher in women than the Korean general population. CONCLUSIONS OLT recipients must be checked periodically for de novo malignancy throughout their lives, especially for cancers common in the general population.
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Affiliation(s)
- H W Park
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Kim KH, Jung DH, Park KM, Lee YJ, Kim DY, Kim KM, Lee SG. Comparison of open and laparoscopic live donor left lateral sectionectomy. Br J Surg 2011; 98:1302-8. [PMID: 21717424 DOI: 10.1002/bjs.7601] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2011] [Indexed: 12/14/2022]
Abstract
BACKGROUND The present study was undertaken to determine whether laparoscopic live donor left lateral sectionectomy (LLS) in paediatric liver transplantation is a feasible, safe and reproducible procedure, compared with open live donor left lateral sectionectomy (OLS). METHODS A retrospective review was conducted of all consecutive live donor procedures for paediatric liver transplantation performed between May 2008 and October 2009. All live donor hepatectomies were carried out by a single surgeon. RESULTS A total of 26 live donor procedures for paediatric liver transplantation were performed, of which 11 were LLS and 11 OLS; four left hepatectomies were excluded. The LLS group had a significantly shorter hospital stay (mean(s.d.) 6·9(0·3) versus 9·8(0·9) days; P = 0·001) and time to oral diet (2·1(0·3) versus 2·7(0·4) days; P = 0·012). Duration of operation, blood loss, warm ischaemia time and out-of-pocket medical costs were comparable between groups. There was no death in either donor group and only one complication, a wound seroma, in the OLS group. CONCLUSION LLS seemed to be a safe, feasible and reproducible procedure, and was associated with reduced hospital stay.
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Affiliation(s)
- K H Kim
- Division of Hepatobiliary Surgery and Liver Transplantation, University of Ulsan College of Medicine and Asan Medical Centre, Songpa-gu, Seoul, Korea.
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Hwang S, Kim KH, Song GW, Yu YD, Park GC, Kim KW, Choi NK, Park PJ, Choi YI, Jung DH, Ahn CS, Moon DB, Ha TY, Lee SG. Peritransplant monitoring of immune cell function in adult living donor liver transplantation. Transplant Proc 2011; 42:2567-71. [PMID: 20832545 DOI: 10.1016/j.transproceed.2010.04.040] [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] [Received: 10/19/2009] [Accepted: 04/21/2010] [Indexed: 01/12/2023]
Abstract
PURPOSE We evaluated the clinical utility of peritransplant in vitro assays of immune cell function in adult living donor liver transplant (LDLT) recipients. METHODS In particular, we measured immune cell function, using the ImmuKnow assay, in 107 adult LDLT recipients and 200 potential living liver donors (control group) admitted to our center between July 2008 and January 2009. RESULTS In the control group, the mean proportion of T-helper/inducer cells was 36.8% ± 8.2%. The degree of immune response was strong in 12%, moderate in 77%, and low in 11%. In the study group, the degree of immune response within the first month was strong in 4.6%, moderate in 38.2%, and low in 57.2%, thus significantly lower than in the control group (P < .001). ImmuKnow results and tacrolimus levels did not show a significant correlation (r(2) = .002, P = .392). Although six patients showed biopsy-proven acute cellular rejection, none showed a strong immune response. Patients with overt infection showed a lower immune response. CONCLUSIONS These results indicate that peritransplant assessment of immune response using the ImmuKnow assay does not reliably predict the occurrence of acute rejection. Additional studies are necessary to accurately assess the clinical utility of immune response monitoring.
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Affiliation(s)
- S Hwang
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Hwang S, Lee SG, Ahn CS, Kim KH, Moon DB, Ha TY, Park KM, Song GW, Jung DH, Kim BS, Moon KM. Small-sized liver graft does not increase the risk of hepatocellular carcinoma recurrence after living donor liver transplantation. Transplant Proc 2007; 39:1526-9. [PMID: 17580180 DOI: 10.1016/j.transproceed.2007.03.066] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Accepted: 03/20/2007] [Indexed: 01/11/2023]
Abstract
PURPOSE Following implantation into adult recipients, living donor liver grafts usually undergo liver regeneration. This regeneration process may provoke the growth of occult hepatocellular carcinoma (HCC) cells in the recipient body. To assess the risk of HCC recurrence, we analyzed the influence of graft-recipient weight ratio (GRWR). METHODS The 181 recipients with HCC within the University of California at San Francisco (UCSF) criteria were divided into four groups according to GRWR: low GRWR (<0.8; n = 30), mid GRWR (0.8-1.0; n = 65), high GRWR (>1.0; n = 64), and whole liver graft group (>1.5; n = 22). RESULTS There were no differences in overall patient survival (P = .105) and recurrence-free survival (P = .406) among these four groups. GRWR <0.8 was not a significant risk factor for HCC recurrence. Similar outcomes were obtained in HCC patients who met the Milan criteria (n = 170). CONCLUSIONS We think that small living donor liver graft and subsequent liver regeneration do not increase the risk of posttransplant HCC recurrence when HCC is within the Milan or UCSF criteria.
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Affiliation(s)
- S Hwang
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Poongnap-Dong, Seoul 138-736, Republic of Korea
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Kim KH, Lee SG, Lee YJ, Park KM, Hwang S, Ahn CS, Moon DB, Ha TY, Song KW, Kim DS, Jung DH, Kim BS, Moon KM, Lee HJ, Park JI, Ryu JH. Suitable whole blood levels 2 hours after neoral in liver transplant patients: experiences at a single center. Transplant Proc 2007; 38:2971-3. [PMID: 17112877 DOI: 10.1016/j.transproceed.2006.08.148] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2006] [Indexed: 11/23/2022]
Abstract
UNLABELLED Whole blood levels 2 hours after Neoral (C2) administration were observed to correlate better with area under the curve (AUC(0-4)) than trough levels (C0), suggesting that C2 may be the best single time point predictor of Neoral absorption. Owing to concerns about drug toxicity due to excessive immunosuppression, C2 adjustments to target blood levels may represent an advance. The present study measured C2 and levels to determine which correlated more closely with AUC(0-4). METHODS Between August 2003 and July 2004, 40 adult liver transplantations were performed in our center. All patients received Neoral twice daily. They were maintained at a C0 level of about 200 ng/mL. C0 levels were measured daily. C2 levels were estimated on postoperative days 3, 5, 7, 14, and 28. AUC(0-4) performed on postoperative days 3, 7, and 28 was calculated using the trapezoidal rule. RESULTS The mean AUC(0-4), C0, C1, C2, C3, and C4 were 1100.3 +/- 484.8 ng/mL, 197.1 +/- 84.7 ng/mL, 240.7 +/- 166.2 ng/mL, 307.8 +/- 162.6 ng/mL, 302.8 +/- 138.9 ng/mL, and 300.3 +/- 142.8 ng/mL, respectively. C2 correlated with AUC(0-4) (R2 = 0.868: P < .05) better than C0 (R2 = 0.245: P < .05), C1 (R2 = 0.604: P < .05), or C4 (R2 = 0.583: P < .05). CONCLUSIONS Neoral dose monitoring according to a mean C2 range of 307.8 +/- 162.6 ng/mL correlated better with AUC(0-4). Further studies are required to determine suitable C2 levels in liver transplant patients.
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Affiliation(s)
- K H Kim
- Division of HBP Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
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Abstract
Triadin is a ryanodine receptor and calsequestrin binding protein located in junctional sarcoplasmic reticulum of striated muscles. In the present study, mouse cardiac triadin cDNAs have been identified by cDNA library screening and RT-PCR. The deduced aa sequences show that the three isoforms consist of 277, 293 and 305 aa giving rise to the molecular weights of approximately 31,414, 33,066, and 34,328, respectively. The isoforms have identical 262 aa N-terminal sequences, whereas they have distinct C-terminal sequences. Northern blot analysis using a cDNA probe representing the N-terminal common region of triadin revealed that the mouse triadins were present both in heart and skeletal muscles. The estimated sizes of the transcripts were approximately 1.3, 4.3 and 5 kb in heart and 5, 5.5 and 7 kb in skeletal muscle. Endo H treatment and Western blot analysis of isolated mouse cardiac sarcoplasmic reticulum and in vitro translation products indicate that there are three distinct mouse cardiac triadin isoforms having molecular weights of 35, 35.5 and 40 kDa. We termed those three isoforms as mouse cardiac triadin 1, mouse cardiac triadin 2 and mouse cardiac triadin 3.
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Affiliation(s)
- C S Hong
- Department of Life Science, Kwangju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Kwangju 500-712, South Korea
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Kim SC, Jeon SH, Jung IR, Kim KH, Kwon MH, Kim JH, Yi JH, Kim SJ, You JC, Jung DH. Formation and emission status of PCDDs/PCDFs in municipal solid waste incinerators in Korea. Chemosphere 2001; 43:701-707. [PMID: 11372855 DOI: 10.1016/s0045-6535(00)00423-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study was carried out to examine the formation and the emission status of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDDs/PCDFs) in the flue gases of commercial-scale municipal solid waste (MSW) incinerators, and thus to provide the engineering data for the reduction of PCDDs/PCDFs emitted from MSW incinerators. The formation concentrations of the PCDDs/PCDFs generated at the outlet of waste heat boilers (WHB) were in the range of 1.18-29.61 ng-TEQ/N m3 (average 5.75 ng-TEQ/N m3), while the emission concentrations at the stacks were in the range of 0.026-4.548 ng-TEQ/N m3 (average 0.924 ng-TEQ/N m3). Two major 2,3,7,8-substituted congeners were 2,3,4,7,8-PeCDF and 2,3,4,6,7,8-HxCDF, and their concentrations were up to 50% and 64% of total TEQ values at the outlet of WHB and the stack, respectively. From the results of multi-regression analysis, the formation concentration of PCDDs/PCDFs could be predicted as follows with the correlation factor of r2 = 0.962: PCDDs/PCDFs (ng-TEQ/N m3) = 3.036 (Cl) + 0.094 (T1) - 0.472 (Combustibles) + 0.059 (CO) - 0.039 (THC) - 3.366 (H) + 22.157, where T1 (degrees C) is the temperature at the outlet of the WHB. Cl, Combustibles and H are given as percentages and the others are in parts per million.
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Affiliation(s)
- S C Kim
- NIER (National Institute of Environmental Research), Seo-Ku, Inchon, South Korea.
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Kim SC, Jeon SH, Jung IR, Kim KH, Kwon MH, Kim JH, Yi JH, Kim SJ, You JC, Jung DH. Removal efficiencies of PCDDs/PCDFs by air pollution control devices in municipal solid waste incinerators. Chemosphere 2001; 43:773-776. [PMID: 11372864 DOI: 10.1016/s0045-6535(00)00432-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Removal efficiencies of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDDs/PCDFs) by air pollution control devices (APCDs) in the commercial-scale municipal solid waste (MSW) incinerators with a capacity of above 200 ton/day were evaluated. The removal efficiencies of PCDDs/PCDFs were up to 95% when the activated carbon (AC) was injected in front of electrostatic precipitator (EP). Spray dryer absorber/bag filter (SDA/BF) had high removal efficiency (99%)) of PCDDs/PCDFs when a mixture of lime and AC was sprayed into the SDA. When the AC was not added in scrubbing solution, the whole congeners of PCDDs/PCDFs were enriched in the wet scrubber (WS) with negative removal efficiencies of -25% to -5731%. Discharge of PCDDs/PCDFs was decreased with increasing the proportions of AC added in scrubbing solution. Selective catalytic reduction (SCR) system had the removal efficiencies of up to 93% during the test operation.
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Affiliation(s)
- S C Kim
- National Institute of Environmental Research, NIER, Eunpyung-Ku, Seoul, South Korea
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Abstract
OBJECTIVES The blood supply to the nasal tip and columella was examined to determine whether it could be damaged as a result of transcolumellar incision during an external rhinoplasty approach in Asians. METHODS The blood vessels that supply the nasal tip were examined by dissecting 51 cadavers, and their corresponding 102 nasal sections were injected with red latex before dissection. The size and distribution of the vessels were measured with the unaided eye and the primary supply vessels were determined. The subdermal layer in which the vessels lie and the course of the vessels were also investigated. RESULTS The main blood supply source of the nasal tip proved to be the lateral nasal artery in 78% (80/102) of the cases examined, while the remaining cases (22%) received their blood supply via the dorsal nasal artery. Columellar branches were narrow in diameter and varied in size and appearance, and were therefore appeared insufficient as a main blood supply. These arteries passed through the musculoaponeurotic layer, but they were also in close proximity to the main surgical plane in the dome of the lower lateral cartilage. CONCLUSIONS The authors speculate that the nasal tip blood supply in Asians is primarily derived from the lateral nasal or dorsal nasal arteries, with a variable contribution from the columella arteries. Therefore, it is important to correctly determine the surgical plane below the musculoaponeurotic layer in order to prevent skin flap necrosis or nasal tip deformity that may occur from damage to the main vessel during an external rhinoplasty approach.
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Affiliation(s)
- D H Jung
- Department of Otolaryngology, Inha University, College of Medicine, Inchon, Korea.
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Abstract
OBJECTIVES Although a complete anatomic knowledge of the fontanelle is a prerequisite to perform a surgical antrostomy opening, little is known about the boundary, shape, and size of the fontanelle. The purpose of this paper is to determine the best site for maintaining the patency of a surgical antrostomy opening by defining the anatomic boundaries, shape, and size of the fontanelle as well as its histological structure. MATERIALS AND METHODS One hundred sagittally divided heads were utilized. Mucosa overlying the lateral nasal wall was carefully removed with an operating microscope under 6x magnification. In some cases, a double mucous membrane, including the posteroinferior portion of the uncinate process, was cut as a whole and embedded in paraffin. The sections were stained with H&E. RESULTS The boundary of the fontanelle and the location of the natural ostium were described in detail. Eight patterns of the posteroinferior portion of the uncinate process were observed. There were three major fontanelle shapes when observed from the medial aspect to the lateral: triangular, pencil-like, and oval. The triangular type was the most common. The anterior portion of the fontanelle was shorter than the posterior when observed medially and was wider than the posterior portion when observed inferiorly. CONCLUSIONS The anterior portion of the fontanelle is more prone to stenosis than the posterior portion. An antrostomy in the posterior fontanelle may be more ideal for a middle meatal antrostomy of the maxillary sinus.
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Affiliation(s)
- J H Yoon
- Department of Otorhinolaryngology, Yonsei University College of Medicine, Seodaemun-gu, Seoul, Korea.
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Yun YS, Min YG, Rhee CS, Jung IH, Koh YY, Jang TY, Jung DH. Effects of alpha-toxin of Staphylococcus aureus on the ciliary activity and ultrastructure of human nasal ciliated epithelial cells. Laryngoscope 1999; 109:2021-4. [PMID: 10591367 DOI: 10.1097/00005537-199912000-00024] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [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: 11/26/2022]
Abstract
OBJECTIVE The in vitro effects of staphylococcal alpha-toxin on ciliary activity were investigated at different concentrations and exposure times. STUDY DESIGN Ciliated epithelial cells of the sphenoid sinus were taken from patients operated on for pituitary tumors. Video-computerized analysis technique and transmission electron microscopy were used to analyze the effects of the toxin on ciliary activity. METHODS Ciliary beat frequency (CBF) was measured in four different concentrations of alpha-toxin including 0.1, 1, 10, and 50 microg/mL. CBF was measured at 2, 4, 6, 12, 24, and 48 hours after administration of the toxin. To observe reversibility of the reduced ciliary activity, after 24-hour incubation in the media containing 10 microg/mL of alpha-toxin, the media were replaced with alpha-toxin-free media. The tissues were also processed for transmission electron microscopy to observe ultrastructural changes of the epithelial cells. RESULTS CBF increased significantly at 2-hour incubation and then decreased significantly after 12-hour incubation in 10 microg/mL of alpha-toxin (P< .05, repeated-measures ANOVA). The transmission electron microscopic findings showed mitochondrial swelling and a slight protrusion of the plasma membrane of the cilia. In toxin-free media, loss of ciliary activity was not recovered. CONCLUSIONS CBF increased at first, but with increasing incubation time ciliary movements decreased gradually and stopped eventually. This loss of CBF may be an irreversible change associated with ultrastructural changes in the mitochondria and the plasma membrane of the cilia.
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Affiliation(s)
- Y S Yun
- Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Inha University, Inchon, Korea
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Kim CS, Moon BK, Jung DH, Min YG. Correlation between nasal obstruction symptoms and objective parameters of acoustic rhinometry and rhinomanometry. Auris Nasus Larynx 1998; 25:45-8. [PMID: 9512794 DOI: 10.1016/s0385-8146(97)10011-6] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.2] [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: 02/06/2023]
Abstract
Acoustic rhinometry and rhinomanometry have been used to assess nasal airway patency objectively. We compared nasal obstruction symptoms before and after decongestion with several parameters of these objective tests. The patients assessed their nasal obstruction using a visual analogue scale (VAS). Cross-sectional areas and nasal resistance were measured by acoustic rhinometry and rhinomanometry before and after topical application of 1% phenylephrine solution in 32 patients with nasal obstruction symptoms. There was no significant correlation between the difference in the VAS and the difference in nasal resistance. There was also no significant correlation between the difference in the VAS and minimal cross-sectional area and cross-sectional areas at 3.3 cm (CA3.3), CA4.0 and CA6.4 from the nosepiece both in the wide and narrow sides and in both nasal cavities before and after nasal decongestion. It is concluded that rhinomanometry and acoustic rhinometry may have no diagnostic value in estimating the severity of nasal obstruction symptoms.
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Affiliation(s)
- C S Kim
- Department Otorhinolaryngology, Seoul National University College of Medicine, Korea
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Abstract
A new starch derivative for the determination of amylase activity has been synthesized by coupling Procion Yellow dye with starch. The product of this reaction is intensely yellow and is easily suspended in water, in neutral buffer solution, and also in acidic solution. Amylase from pancreatin, saliva, urine and serum readily hydrolyzes this chromogenic substrate. A method for determining amylase activity based on the use of Procion Yellow Starch substrate is described. The procedure requires 0.1 ml of sample and an incubation time of 30 min. The soluble chromogen, which is liberated by enzymatic hydrolysis, is measured at 420 nm and the amylase activity-absorbance relationship at this wavelength is linear. The normal range for this method is 50--150 Somogyi units/dl.
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Parekh AC, Cook S, Sims C, Jung DH. A new method for the determination of serum creatinine based on reaction with 3.5-dinitrobenzoyl chloride in an organic medium. Clin Chim Acta 1976; 73:221-31. [PMID: 1000844 DOI: 10.1016/0009-8981(76)90167-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A new method for the determination of serum creatine, based on its reaction with 3,5-dinitrobenzoyl chloride in an organic medium is described. Various analytical parameters are studied and comparisons are made with the routine picrate procedures, as well as the dinitrobenzoic acid methods reported in the literature. On the basis of the data submitted, the proposed method is recommended for routine clinical use.
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Parekh AC, Caranto M, Mathur RK, Jung DH. Fractionation of serum cholesterol: a critique. Ann Clin Lab Sci 1976; 6:423-9. [PMID: 970928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A procedure for fractionation of serum cholesterol is developed by employing digitonin for the precipitation of free cholesterol in isopropanol. This method is based on the ferric acetate color reaction which is unaffected by traces of digitonin. It is influenced only negligibly by the presence of stanols in serum and is shown to be equally chromogenic with respect to both free and ester forms of cholesterol. The proposed procedure shows a three-fold improvement in precision (3.1 percent coefficient of variation [CV]) compared to that of the procedure by Leffler and McDougald (10.5 percent C.V.) which is based on the ferric chloride color reaction. The proposed free cholestrol procedure showed a mean recovery of 99.5% percent (98.1 to 102.5 percent) when cholesterol in 40 to 200 mg per dl concentrations was added to serum. The analytical performance of the proposed fractionation of serum cholesterol is critically reviewed with respect to its potential application in the diagnosis of liver diseases and in basic or experimental research.
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Jung DH, Biggs HG, Moorehead WR. Colorimetry of serum cholesterol with use of ferric acetate/uranyl acetate and ferrous sulfate/sulfuric acid reagents. Clin Chem 1975; 21:1526-30. [PMID: 1157327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Abstract
Interference from various physiological and non-physiological steroids in the spectrophotometric determination of cholesterol by the Zak method (ferric chloride) and the method of Parekh and Jung (ferric acetate) was quantitatively measured. Contribution of the steroids at the specific absorption maxima of the cholesterol assays was determined by employing the steroids (40 mg/dl) alone, or added to a serum pool of known cholesterol content. The results show that the method of Parekh and Jung is less influenced by the presence of steroids than the Zak method. Observations on the structural specificity of the iron-cholesterol reaction are discussed.
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Abstract
The Parekh-Jung method for determination of inorganic phosphorus in serum was applied to its determination in urine. Accuracy is good. The mean percentage recovery of added phosphorus was 100.2%. Forty analyses of a sample gave a mean value of 46.71 mg/100 ml +/- 0.76 standard deviation (between-batch precision). The relative usefulness of the Parekh-Jung method compared with those other methods is discussed.
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Jung DH, Parekh AC. A semi-micromethod for the determination of serum iron and iron-binding capacity without deproteinization. Am J Clin Pathol 1970; 54:813-7. [PMID: 5484033 DOI: 10.1093/ajcp/54.6.813] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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Jung DH, Parekh AC. An improved reagent system for the measurement of serum uric acid. Clin Chem 1970; 16:247-50. [PMID: 5437967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Abstract
Abstract
The reagent is modified as follows: Serum chromogens are destroyed by trisodium phosphate. The use of phosphotungstic acid eliminates the tungstate and sulfate anions, a frequent cause of turbidity. Triethanolamine, added to the carbonate—urea mixture, provides unusual stability of the color through its buffering action. Only 0.2 ml of serum is required. The method is highly reproducible and accurate; analytical results agree closely with those obtained by the uricase or cyanide—urea method.
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Affiliation(s)
- D H Jung
- Clinical Laboratory, Indiana University Medical Center, 1100 West Michigan St., Indianapolis, Ind. 46202
| | - A C Parekh
- Clinical Laboratory, Indiana University Medical Center, 1100 West Michigan St., Indianapolis, Ind. 46202
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