1
|
Zhang Y, Wu KH, Li Q, Zhang HJ, Shang YY, Pang MJ. [Analysis on related factors of myocardial fibrosis in patients with hypertrophic cardiomyopathy]. Zhonghua Xin Xue Guan Bing Za Zhi 2021; 49:31-36. [PMID: 33429483 DOI: 10.3760/cma.j.cn112148-20200609-00475] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Objective: To investigate the related factors of myocardial fibrosis in patients with hypertrophic cardiomyopathy. Methods: Patients with hypertrophic cardiomyopathy, hospitalized in the First People's Hospital of Yunnan Province from January 2016 to May 2020, were included in this cross-sectional study. Patients were divided into delayed enhancement positive group (fibrosis group) and non-delayed enhancement group (non-fibrosis group). According to the maximum left ventricular end diastolic wall thickness (LVMWT), patients in the fibrosis group was further divided into mild hypertrophy group, moderate hypertrophy group and severe hypertrophy group. The baseline clinical data of patients were collected by medical record management system. All enrolled patients underwent cardiac magnetic resonance imaging (CMR). The presence and location of myocardial fibrosis were identified by CMR gadolinium contrast delayed enhancement (LGE). The range of LGE (LGE%) was calculated by visual analysis. The levels of N-terminal pro-B-type natriuretic peptide (NT-proBNP) and cardiac troponin I (cTnI) in peripheral blood were measured. Results: A total of 48 patients ( age (46.4±14.3) years, 42 (87.5%) males) were enrolled. There were 34 LGE positive cases (fibrosis group) and 14 LGE negative cases (non-fibrosis group). Compared with non-fibrosis group, patients in fibrosis group were younger (P=0.038) and prevalence of NYHA grade Ⅲ/Ⅳ was higher (P=0.00). Compared with non-fibrosis group, patients in fibrosis group had thicker LVMWT (P= 0.008), higher left ventricular mass index(LVMI) (P=0.001), higher left ventricular end diastolic volume (LVEDV) (P=0.043), lower left ventricular ejection fraction (LVEF) and cardiac index (CI) (all P <0.05). The levels of NT-proBNP and cTnI were significantly higher in fibrosis group than in non-fibrosis group (2 760.5 (1 503.4, 3 783.6) ng / L vs. 861.3 (552.2, 1 092.8) ng / L, P=0.002; 0.970 (0.448, 1.684)μg / L vs. 0.147 (0.033, 0.251)μg / L, P=0.041).In fibrosis group, there were 15 cases of mild hypertrophy (mild hypertrophy group), 10 cases of moderate hypertrophy (moderate hypertrophy group), and 9 cases of severe hypertrophy (severe hypertrophy group). The LGE% and NT-proBNP and cTnI increased in proportion with increasing myocardial hypertrophy (P<0.05). LGE% was negatively correlated with age (r=-0.618, P=0.011), and positively correlated with NT-proBNP and cTnI levels (r=0.271, P=0.010; r=0.111,P=0.013, respectively), and positively correlated with LVEDV, LVMWT and LVMI (r=0.438, P=0.09; r=0.735, P=0.001; r=0.532, P=0.034, respectively). Conclusions: In patients with hypertrophic cardiomyopathy, the extent of myocardial fibrosis increases with the increase of myocardial hypertrophy. Myocardial fibrosis is negatively correlated with age, and positively correlated with NT-proBNP and cTnI, as well as LVEDV, LVMWT and LVMI in this patient cohort.
Collapse
Affiliation(s)
- Y Zhang
- Department of Magnetic Resonance, Affiliated Hospital of Kunming University of Science and Technology, First People's Hospital of Yunnan Province, Kunming 650032,China
| | - K H Wu
- Department of Magnetic Resonance, Affiliated Hospital of Kunming University of Science and Technology, First People's Hospital of Yunnan Province, Kunming 650032,China
| | - Q Li
- Department of Magnetic Resonance, Affiliated Hospital of Kunming University of Science and Technology, First People's Hospital of Yunnan Province, Kunming 650032,China
| | - H J Zhang
- Department of Magnetic Resonance, Affiliated Hospital of Kunming University of Science and Technology, First People's Hospital of Yunnan Province, Kunming 650032,China
| | - Y Y Shang
- Department of Magnetic Resonance, Affiliated Hospital of Kunming University of Science and Technology, First People's Hospital of Yunnan Province, Kunming 650032,China
| | - M J Pang
- Department of Magnetic Resonance, Affiliated Hospital of Kunming University of Science and Technology, First People's Hospital of Yunnan Province, Kunming 650032,China
| |
Collapse
|
2
|
Wu KH, Cheng CC, Li JP, Weng TF, Yang SF, Pan HH, Chao YH. Toll-like receptor signalling associated with immunomodulation of umbilical cord-derived mesenchymal stem cells in mice with systemic lupus erythematosus. Lupus 2020; 29:165-175. [PMID: 31964222 DOI: 10.1177/0961203319898532] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
With potent immunomodulatory activities, mesenchymal stem cells (MSCs) have the potential to be a beneficial treatment option for diseases with aberrant immune responses such as systemic lupus erythematosus (SLE). However, the underlying mechanisms remain largely unknown. Here, we used NZBWF1 mice as a SLE animal model to examine immunomodulation of MSCs as well as to assess the role of Toll-like receptor signalling in this circumstance. We found that mice receiving MSCs had a significant decrease in severity of proteinuria at 20 and 22 weeks of age (p = 0.009 and p = 0.022, respectively). Serum anti-dsDNA levels were significantly lower compared with the control group (p = 0.016 and p = 0.036, respectively). C3 and C4 levels were significantly higher at 22 weeks of age (p = 0.046 and p = 0.016, respectively). Altered expression of inflammation-associated cytokine profiles in the serum was also noted in mice receiving MSCs. Down-regulation of myeloid differentiation factor 88 (MyD88)-nuclear factor-κB (NF-κB) signalling in the liver was demonstrated by quantitative polymerase chain reaction, ELISA and Western blotting. In addition to demonstrating the beneficial effects of MSC treatment in NZBWF1 mice, our study provided the first evidence for the association of MyD88-NF-κB signalling and MSC-mediated immunomodulation in this disease.
Collapse
Affiliation(s)
- K H Wu
- Division of Pediatric Hematology-Oncology, Children's Hospital, China Medical University, Taichung, Taiwan.,School of Post-baccalaureate Chinese Medicine, China Medical University, Taichung, Taiwan
| | - C C Cheng
- Laboratory Animal Service Center, Office of Research and Development, China Medical University, Taichung, Taiwan
| | - J P Li
- Rheumatology Research Center, China Medical University Hospital, Taichung, Taiwan.,School of Dentistry, National Defense Medical Center, Taipei, Taiwan
| | - T F Weng
- Division of Pediatric Hematology-Oncology, Children's Hospital, China Medical University, Taichung, Taiwan
| | - S F Yang
- Department of Medical Research, Chung Shan Medical University Hospital, Taichung, Taiwan.,Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - H H Pan
- Department of Pediatrics, Chung Shan Medical University Hospital, Taichung, Taiwan.,School of Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - Y H Chao
- Department of Pediatrics, Chung Shan Medical University Hospital, Taichung, Taiwan.,School of Medicine, Chung Shan Medical University, Taichung, Taiwan
| |
Collapse
|
3
|
Tsai TC, Wu KH, Kung CT, Li CJ. Acute Myocardial Injury and Complete Atrioventricular Block Induced by Transient Coronary Artery Spasm. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791302000614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A 65-year-old man with no previous history of heart disease presented with cardiogenic shock. Acute right ventricular failure following extensive inferior wall myocardial infarction and complete atrioventricular block were noted and emergent angiography revealed insignificant coronary arterial stenosis. In view of the finding and absence of myocardial vasculitis, coronary artery spasm was implicated as the cause of myocardial infarction and complete atrioventricular block. After the reversal of the shock and successful angioplasty, the patient continued to take lercanidipine and had been angina-free during follow-up of 5 months. (Hong Kong j.emerg.med. 2013;20:396-399)
Collapse
|
4
|
Tsai TC, Wu KH, Kung CT, Li CJ. Acute Myocardial Injury and Complete Atrioventricular Block Induced by Transient Coronary Artery Spasm. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791302000613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A 65-year-old man with no previous history of heart disease presented with cardiogenic shock. Acute right ventricular failure following extensive inferior wall myocardial infarction and complete atrioventricular block were noted and emergent angiography revealed insignificant coronary arterial stenosis. In view of the finding and absence of myocardial vasculitis, coronary artery spasm was implicated as the cause of myocardial infarction and complete atrioventricular block. After the reversal of the shock and successful angioplasty, the patient continued to take lercanidipine and had been angina-free during follow-up of 5 months. (Hong Kong j.emerg.med. 2013;20:396-399)
Collapse
|
5
|
Chiang CY, Lee CW, Tsai TC, Li CJ, Lee WH, Wu KH. Dynamic Internet-Mediated Team-Based Case Management of High-Frequency Emergency Department Users. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791402100305] [Citation(s) in RCA: 4] [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: 11/16/2022] Open
Abstract
Introduction We assessed whether a strategy using dynamic, internet-mediated, team-based case management could reduce the number of subsequent emergency department (ED) visits by frequent ED users. Methods Patients who attended the ED three or more times within 72 hours in June 2010 were identified. These cases were divided into the pain management or chronic disease group according to their chief complaint. Patients were assessed by expert panels, and initial care plans were developed and posted on an internal website. Thereafter, each emergency physician could follow or adjust the care plans dynamically via the internal website according to the patient's condition and use the website to communicate results. Care plans were revised by the team according to the patient's clinical situation as it changed. Patient ED visits over the subsequent six months were monitored. Results Fourteen cases were enrolled in the study, seven in each group. The mean number of visits per patient per month in the pain management and chronic disease groups decreased from 14.9 to 5.79 (p=0.031) and 6.1 to 2.9 (p<0.001) visits per month after the intervention, respectively. The overall mean number of visits per patient per month decreased from 10.5 to 4.36 (p=0.004), a decrease of 6.14 visits (58.27%). Conclusions Dynamic internet-mediated team-based case management may help to reduce subsequent visits in patients who frequently visit the ED. (Hong Kong j.emerg.med. 2014;21:161-166)
Collapse
Affiliation(s)
| | - CW Lee
- Kaohsiung Medical University Hospital, Department of Emergency Medicine, Kaohsiung Medical University, No.100, Tzyou 1st Road, Kaohsiung 807, Taiwan
| | | | | | | | | |
Collapse
|
6
|
Wu KH, Wu HP, Lin HJ, Wang CH, Chen HY, Weng T, Peng CT, Chao YH. Concurrent hypopituitarism and leukemic retinopathy in a child with B-precursor acute lymphoblastic leukemia and isolated central nervous system relapse. Curr Oncol 2016; 23:e431-4. [PMID: 27536191 DOI: 10.3747/co.23.3006] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Hypopituitarism in leukemia is very rare. In addition, central nervous system (cns) relapse and leukemic retinopathy in childhood acute lymphoblastic leukemia (all) have declined with the use of modern systemic chemotherapy that includes cns prophylaxis. Here, we report the case of a 4-year-old girl who received chemotherapy and intrathecal therapy without cns radiation after a diagnosis of B-precursor all without cns involvement. Three months after chemotherapy completion, she presented with lower-extremity weakness and was diagnosed with an isolated cns relapse. Concurrent hypopituitarism and leukemic retinopathy were also found. After receiving craniospinal radiotherapy and systemic chemotherapy, her retinopathy and vision improved. She is now in complete remission, and she is still on chemotherapy according to the guideline from the Pediatric Oncology Group. Although rare, hypopituitarism and leukemic retinopathy should be taken into consideration in patients with cns involvement by leukemia.
Collapse
Affiliation(s)
- K H Wu
- School of Post Baccalaureate Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung; Division of Pediatric Hematology-Oncology, Children's Hospital, China Medical University, Taichung
| | - H P Wu
- Division of Pediatric General Medicine, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan; College of Medicine, Chang Gung University, Taoyuan
| | - H J Lin
- Department of Ophthalmology, China Medical University Hospital, Taichung; Department of Medical Research, China Medical University Hospital, Taichung
| | - C H Wang
- Division of Genetics and Metabolism, Children's Hospital, China Medical University, Taichung
| | - H Y Chen
- Department of Radiology, China Medical University Hospital, Taichung
| | - T Weng
- Division of Pediatric Hematology-Oncology, Children's Hospital, China Medical University, Taichung
| | - C T Peng
- Division of Pediatric Hematology-Oncology, Children's Hospital, China Medical University, Taichung; Department of Biotechnology and Bioinformatics, Asia University, Taichung
| | - Y H Chao
- Department of Pediatrics, Chung Shan Medical University Hospital, Taichung, Taiwan.; School of Medicine, Chung Shan Medical University, Taichung, Taiwan
| |
Collapse
|
7
|
Wu KH, Wu HP, Weng T, Peng CT, Chao YH. Dasatinib for a child with Philadelphia chromosome-positive acute lymphoblastic leukemia and persistently elevated minimal residual disease during imatinib therapy. ACTA ACUST UNITED AC 2015; 22:303-6. [PMID: 26300669 DOI: 10.3747/co.22.2719] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Imatinib has improved outcomes in patients with Philadelphia chromosome-positive (Ph+) acute lymphoblastic leukemia (all). Minimal residual disease (mrd) is a useful tool for predicting leukemia relapse. However, there is no consensus on how to treat children with elevation of BCR-ABL transcripts but no evidence of hematologic relapse during chemotherapy combined with imatinib. Here, we report the case of a child with Ph+ all who had persistent elevation of mrd, but no evidence of hematologic relapse while receiving imatinib plus intensive chemotherapy. Dasatinib was substituted for imatinib because no suitable donor for allogeneic hematopoietic stem-cell transplantation (hsct) was available. Less-intensive chemotherapy with methotrexate and 6-mercaptopurine was administered concomitantly. No serious adverse events were encountered. With continuous dasatinib combined with chemotherapy, but no allogeneic hsct, our patient reached complete molecular remission and has been in complete molecular remission for more than 13 months. This report is the first about the long-term use of dasatinib in patients with Ph+ all and mrd elevation but hematologic remission during imatinib chemotherapy. In a similar situation, chemotherapy combined with dasatinib instead of allogeneic hsct could be considered to avoid hsct-related mortality and morbidity. Clinical trials are needed.
Collapse
Affiliation(s)
- K H Wu
- School of Chinese Medicine, China Medical University, Taichung, Taiwan; ; Department of Pediatrics, Children's Hospital, China Medical University, Taichung, Taiwan
| | - H P Wu
- Department of Pediatrics, Buddhist Tzu-Chi General Hospital, Taichung Branch, Taichung, Taiwan
| | - T Weng
- Department of Pediatrics, Children's Hospital, China Medical University, Taichung, Taiwan
| | - C T Peng
- School of Chinese Medicine, China Medical University, Taichung, Taiwan; ; Department of Pediatrics, Children's Hospital, China Medical University, Taichung, Taiwan; ; Department of Biotechnology and Bioinformatics, Asia University, Taichung, Taiwan
| | - Y H Chao
- Department of Pediatrics, Chung Shan Medical University Hospital, Taichung, Taiwan; ; School of Medicine, Chung Shan Medical University, Taichung, Taiwan
| |
Collapse
|
8
|
Luo CW, Tseng PS, Chen HJ, Wu KH, Li LJ. Dirac fermion relaxation and energy loss rate near the Fermi surface in monolayer and multilayer graphene. Nanoscale 2014; 6:8575-8578. [PMID: 24975649 DOI: 10.1039/c4nr02205j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Ultrafast dynamics of Dirac fermions near the Fermi surface in monolayer and multilayer graphene are revealed using optical pump mid-infrared probe spectroscopy. The energy loss rate of Dirac fermions is also determined via energy-resolved transient transmissivity spectra, which is significantly suppressed as the number of layers in graphene increases.
Collapse
Affiliation(s)
- C W Luo
- Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan.
| | | | | | | | | |
Collapse
|
9
|
Luo CW, Wang HJ, Ku SA, Chen HJ, Yeh TT, Lin JY, Wu KH, Juang JY, Young BL, Kobayashi T, Cheng CM, Chen CH, Tsuei KD, Sankar R, Chou FC, Kokh KA, Tereshchenko OE, Chulkov EV, Andreev YM, Gu GD. Snapshots of Dirac fermions near the Dirac point in topological insulators. Nano Lett 2013; 13:5797-5802. [PMID: 24228733 DOI: 10.1021/nl4021842] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The recent focus on topological insulators is due to the scientific interest in the new state of quantum matter as well as the technology potential for a new generation of THz optoelectronics, spintronics and quantum computations. It is important to elucidate the dynamics of the Dirac fermions in the topologically protected surface state. Hence we utilized a novel ultrafast optical pump mid-infrared probe to explore the dynamics of Dirac fermions near the Dirac point. The femtosecond snapshots of the relaxation process were revealed by the ultrafast optics. Specifically, the Dirac fermion-phonon coupling strength in the Dirac cone was found to increase from 0.08 to 0.19 while Dirac fermions were away from the Dirac point into higher energy states. Further, the energy-resolved transient reflectivity spectra disclosed the energy loss rate of Dirac fermions at room temperature was about 1 meV/ps. These results are crucial to the design of Dirac fermion devices.
Collapse
Affiliation(s)
- C W Luo
- Department of Electrophysics and ‡Institute of Physics, National Chiao Tung University , Hsinchu, Taiwan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Ku SA, Tu CM, Chu WC, Luo CW, Wu KH, Yabushita A, Chi CC, Kobayashi T. Saturation of the free carrier absorption in ZnTe crystals. Opt Express 2013; 21:13930-13937. [PMID: 23787582 DOI: 10.1364/oe.21.013930] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This study systematically investigates the influence of free carriers on the generation of THz in ZnTe crystals, over a wide range of pumping fluences. As the pumping fluence is increased (< 6.36 mJ/cm(2)), the concentration of free carriers gradually increases and the THz output power is saturated, as clearly demonstrated by the time delay in the THz temporal waveforms, the changes in the THz spectral weight and the red-shift in the PL spectra. For high pumping fluences (> 6.36 mJ/cm(2)), spectacularly, there is a significant quadratic increase in the THz output power when the pumping fluence is increased, as well as at low pumping fluences of < 0.58 mJ/cm(2), because of the saturation of free carriers.
Collapse
Affiliation(s)
- S A Ku
- Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Ebert P, Landrock S, Jiang Y, Wu KH, Wang EG, Dunin-Borkowski RE. Electronically nonalloyed state of a statistical single atomic layer semiconductor alloy. Nano Lett 2012; 12:5845-5849. [PMID: 23102267 DOI: 10.1021/nl303197a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Using atomically and momentum resolved scanning tunneling microscopy and spectroscopy, we demonstrate that a two-dimensional (2D) √3 × √3 semiconducting Ga-Si single atomic alloy layer exhibits an electronic structure with atomic localization and which is different at the Si and Ga atom sites. No indication of an interaction or an electronic intermixing and formation of a new alloy band structure is present, as if no alloying happened. The electronic localization is traced back to the lack of intra alloy bonds due to the 2D atomically confined structure of the alloy overlayer.
Collapse
Affiliation(s)
- Ph Ebert
- Peter Grünberg Institut, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
| | | | | | | | | | | |
Collapse
|
12
|
Luo CW, Wu IH, Cheng PC, Lin JY, Wu KH, Uen TM, Juang JY, Kobayashi T, Chareev DA, Volkova OS, Vasiliev AN. Quasiparticle dynamics and phonon softening in FeSe superconductors. Phys Rev Lett 2012; 108:257006. [PMID: 23004646 DOI: 10.1103/physrevlett.108.257006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Indexed: 06/01/2023]
Abstract
Quasiparticle dynamics of FeSe single crystals revealed by dual-color transient reflectivity measurements (ΔR/R) provides unprecedented information on Fe-based superconductors. The amplitude of the fast component in ΔR/R clearly gives a competing scenario between spin fluctuations and superconductivity. Together with the transport measurements, the relaxation time analysis further exhibits anomalous changes at 90 and 230 K. The former manifests a structure phase transition as well as the associated phonon softening. The latter suggests a previously overlooked phase transition or crossover in FeSe. The electron-phonon coupling constant λ is found to be 0.16, identical to the value of theoretical calculations. Such a small λ demonstrates an unconventional origin of superconductivity in FeSe.
Collapse
Affiliation(s)
- C W Luo
- Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Wu KH, Chang YC, Zheng MZ, Yang CC, Lin WP. Preparation and characterization of Ag-deposited aminosilane-modified silicate by chemical reduction method. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/polb.22205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
14
|
Wang HF, Wu KH, Tsai CL. Neuroglycopenia in an euglycaemic patient under intensive insulin therapy. Anaesth Intensive Care 2010; 38:1137-1138. [PMID: 21226450] [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: 05/30/2023]
|
15
|
Chen J, Qin HJ, Yang F, Liu J, Guan T, Qu FM, Zhang GH, Shi JR, Xie XC, Yang CL, Wu KH, Li YQ, Lu L. Gate-voltage control of chemical potential and weak antilocalization in Bi₂Se₃. Phys Rev Lett 2010; 105:176602. [PMID: 21231064 DOI: 10.1103/physrevlett.105.176602] [Citation(s) in RCA: 199] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2010] [Indexed: 05/30/2023]
Abstract
We report that Bi₂Se₃ thin films can be epitaxially grown on SrTiO₃ substrates, which allow for very large tunablity in carrier density with a back gate. The observed low field magnetoconductivity due to weak antilocalization (WAL) has a very weak gate-voltage dependence unless the electron density is reduced to very low values. Such a transition in WAL is correlated with unusual changes in longitudinal and Hall resistivities. Our results suggest a much suppressed bulk conductivity at large negative gate voltages and a possible role of surface states in the WAL phenomena.
Collapse
Affiliation(s)
- J Chen
- Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Kumari L, Li WZ, Kulkarni S, Wu KH, Chen W, Wang C, Vannoy CH, Leblanc RM. Effect of Surfactants on the Structure and Morphology of Magnesium Borate Hydroxide Nanowhiskers Synthesized by Hydrothermal Route. Nanoscale Res Lett 2009; 5:149-157. [PMID: 20652148 PMCID: PMC2894163 DOI: 10.1007/s11671-009-9457-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Accepted: 09/26/2009] [Indexed: 05/29/2023]
Abstract
Magnesium borate hydroxide (MBH) nanowhiskers were synthesized using a one step hydrothermal process with different surfactants. The effect surfactants have on the structure and morphology of the MBH nanowhiskers has been investigated. The X-ray diffraction profile confirms that the as-synthesized material is of single phase, monoclinic MgBO(2)(OH). The variations in the size and shape of the different MBH nanowhiskers have been discussed based on the surface morphology analysis. The annealing of MBH nanowhiskers at 500 degrees C for 4 h has significant effect on the crystal structure and surface morphology. The UV-vis absorption spectra of the MBH nanowhiskers synthesized with and without surfactants show enhanced absorption in the low-wavelength region, and their optical band gaps were estimated from the optical band edge plots. The photoluminescence spectra of the MBH nanowhiskers produced with and without surfactants show broad emission band with the peak maximum at around 400 nm, which confirms the dominant contribution from the surface defect states.
Collapse
Affiliation(s)
- Latha Kumari
- Department of Physics, Florida International University, Miami, FL, 33199, USA
| | - WZ Li
- Department of Physics, Florida International University, Miami, FL, 33199, USA
| | - Shrinivas Kulkarni
- Department of Mechanical and Materials Engineering, Florida International University, Miami, FL, 33174, USA
| | - KH Wu
- Department of Mechanical and Materials Engineering, Florida International University, Miami, FL, 33174, USA
| | - Wei Chen
- Department of Mechanical and Materials Engineering, Florida International University, Miami, FL, 33174, USA
| | - Chunlei Wang
- Department of Mechanical and Materials Engineering, Florida International University, Miami, FL, 33174, USA
| | - Charles H Vannoy
- Department of Chemistry, University of Miami, Coral Gables, FL, 33124, USA
| | - Roger M Leblanc
- Department of Chemistry, University of Miami, Coral Gables, FL, 33124, USA
| |
Collapse
|
17
|
Wu KH, Hung CI, Ziolkowski P, Platzek D, Karpinski G, Stiewe C, Mueller E. Improvement of spatial resolution for local Seebeck coefficient measurements by deconvolution algorithm. Rev Sci Instrum 2009; 80:105104. [PMID: 19895088 DOI: 10.1063/1.3246815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A potential Seebeck microprobe apparatus is described such that a profile of Seebeck coefficients can be detected on a material sample surface for thermopower investigations. Due to its spatially resolved limit on detecting small inhomogeneities of dopants or composition changes, we here propose a constructive combination of numerical modeling and practical measurement to improve the spatial resolution by deconvolution algorithm. The relevant transfer function, obtained from numerical calculations, was successfully applied on real measurement data. Besides, an improvement in detecting the 1.5 microm inhomogeneity has been achieved by applying one transfer function of the known tip setup on a set of Seebeck line scan signals, obtained with 6 microm tip-sample contact length, 3 micros signal capture time after contact, and 0.75 microm scan period. The result showed that a system theoretical approach in terms of deconvolution algorithm could theoretically enhance the spatial resolution anyway, but is practically limited by the systemic preconditions (tip size, signal capture time, and scan period) and the signal to noise ratio of the captured thermovoltages. Therefore, we provide a clear understanding of systemic preconditions and their impacts on the detection of small inhomogeneities and thus the performance in the thermopower analysis.
Collapse
Affiliation(s)
- K H Wu
- Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
| | | | | | | | | | | | | |
Collapse
|
18
|
Lin TH, Shih HC, Hsieh CC, Luo CW, Lin JY, Her JL, Yang HD, Hsu CH, Wu KH, Uen TM, Juang JY. Strain-induced effects on antiferromagnetic ordering and magnetocapacitance in orthorhombic HoMnO(3) thin films. J Phys Condens Matter 2009; 21:026013. [PMID: 21814006 DOI: 10.1088/0953-8984/21/2/026013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigated the magnetic and ferroelectric properties of c-axis oriented orthorhombic phase HoMnO(3) (o-HMO in Pbnm symmetry setting) thin films grown on Nb-doped SrTiO(3)(001) substrates. The o-HMO films exhibit an antiferromagnetic ordering near 42 K, irrespective of the orientation of the applied field. However, an additional magnetic ordering occurring around 35 K was observed when the field was applied along the c-axis of o-HMO, which was absent when the field was applied in the ab-plane. The magnetocapacitance measured along the c-axis showed that although there is evidence of dielectric constant enhancement when the temperature is below 35 K the expected abrupt change in dielectric constant appears at a much lower temperature and reaches maximum around 13.5 K, indicating that the low-temperature c-axis polarization might be related to the ordering of the Ho(3+) moment. The lattice constant analyses using x-ray diffraction and the observation of a slight magnetization hysteresis suggest that the weak second magnetic transition along the c-axis at 35 K might be more relevant to the strain-induced effect on antiferromagnetism.
Collapse
Affiliation(s)
- T H Lin
- Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Luo CW, Lee CC, Li CH, Shih HC, Chen YJ, Hsieh CC, Su CH, Tzeng WY, Wu KH, Juang JY, Uen TM, Chen SP, Lin JY, Kobayashi T. Ordered YBCO sub-micron array structures induced by pulsed femtosecond laser irradiation. Opt Express 2008; 16:20610-20616. [PMID: 19065200 DOI: 10.1364/oe.16.020610] [Citation(s) in RCA: 2] [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: 05/27/2023]
Abstract
We report on the formation of organized sub-micron YBa(2)Cu(3)O(7) (YBCO) dots induced by irradiating femtosecond laser pulses on YBCO films prepared by pulse laser deposition with fluence in the range of 0.21 approximately 0.53 J/cm(2). The morphology of the YBCO film surface depends strongly on the laser fluences irradiated. At lower laser fluence (approximately 0.21 J/cm(2)) the morphology was pattern of periodic ripples with sub-micrometer spacing. Slightly increasing the laser fluence to 0.26 J/cm(2) changes the pattern into organized sub-micron dots with diameters ranging from 100 nm to 800 nm and height of 150 nm. Further increase of the laser fluence to over 0.32 J/cm(2), however, appeared to result in massive melting and led to irregular morphology. The mechanism and the implications of the current findings will be discussed. Arrays of YBCO sub-micron dots with T(c) = 89.7 K were obtained.
Collapse
Affiliation(s)
- C W Luo
- Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan, ROC.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Luo CW, Yang YQ, Mak IT, Chang YH, Wu KH, Kobayashi T. A widely tunable dual-wavelength CW Ti:sapphire laser with collinear output. Opt Express 2008; 16:3305-3309. [PMID: 18542419 DOI: 10.1364/oe.16.003305] [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] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report a collinear output and tunable dual-wavelength CW Ti:sapphire laser with a simple cavity configuration. The wavelength splitting range is easily tuned from 10 nm to 110 nm, which provides 56 THz bandwidth for terahertz generation. The total output power of two colors with the spatial mode of TEM(00) is between 700 mW and 300 mW, for small and large wavelength splittings, respectively, under 5 W argon-ion laser pumping.
Collapse
Affiliation(s)
- C W Luo
- Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan, ROC.
| | | | | | | | | | | |
Collapse
|
21
|
Wu KH, Zhou B, Mo XM, Cui B, Yu CT, Lu SH, Han ZC, Liu YL. Therapeutic Potential of Human Umbilical Cord–Derived Stem Cells in Ischemic Diseases. Transplant Proc 2007; 39:1620-2. [PMID: 17580202 DOI: 10.1016/j.transproceed.2006.12.041] [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: 05/21/2006] [Revised: 10/17/2006] [Accepted: 12/13/2006] [Indexed: 11/29/2022]
Abstract
Recent advances suggest human umbilical cord is a new source for stem cells. Our laboratory has established a method to readily isolate and expand stem cells from human umbilical cord tissues. The aim of this study was to investigate the therapeutic potential of human umbilical cord-derived stem (UCDS) cells in ischemic diseases. The UCDS cells were characterized by flow cytometry and differentiation into osteogenic and adipogenic cells. Unilateral hind limb ischemia was surgically induced by femoral artery ligation in nude mice. The animals were intramuscularly injected with 10(6) UCDS cells or control phosphate-buffered saline. Blood perfusion of ischemic limbs was detected by laser Doppler perfusion imaging. Transplantation of UCDS cells to the ischemic limbs of nude mice significantly improved the blood flow to the affected limbs. Thus, transplantation of UCDS cells may potentially be a promising treatment for human ischemic diseases.
Collapse
Affiliation(s)
- K H Wu
- Pediatric Cardiac Center, Department of Surgery, Cardiovascular Institute and Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Affiliation(s)
- T. C. Chang
- a Department of Applied Chemistry, Chung Cheng Institute of Technology , Tuhsi, Taoyuan, Taiwan, 33509, Republic of China
| | - K. H. Wu
- a Department of Applied Chemistry, Chung Cheng Institute of Technology , Tuhsi, Taoyuan, Taiwan, 33509, Republic of China
| | - T. R. Wu
- b Chemical System Research Division , Chung Shun Institute of Science & Technology , Lungtan, Taiwan, 32526, Republic of China
| | - Y. S. Chiu
- b Chemical System Research Division , Chung Shun Institute of Science & Technology , Lungtan, Taiwan, 32526, Republic of China
| |
Collapse
|
23
|
Wu KH, Chen PH, Yang CC, Ho WD, Liu CI. Infrared stealth and anticorrosion performances of organically modified silicate-NiZn ferrite/polyaniline hybrid coatings. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22435] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
24
|
Chang TC, Wang YT, Hong YS, Wu KH, Wu TR. Organic-Inorganic Hybrid Materials 4: NMR Study of the Poly(imide-silica) Hybrids. International Journal of Polymer Analysis and Characterization 2006. [DOI: 10.1080/10236660108033957] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
25
|
Affiliation(s)
- T. C. Chang
- a Department of Applied Chemistry , Chung Cheng Institute of Technology , Tahsi, Taoyuan, Taiwan , 33509 , Republic of China
| | - K. H. Wu
- a Department of Applied Chemistry , Chung Cheng Institute of Technology , Tahsi, Taoyuan, Taiwan , 33509 , Republic of China
| |
Collapse
|
26
|
Abstract
The effects of the aeration, seeding, and agitation on the composting of vegetable waste were studied in a laboratory-scale reactor. Experimental results showed that the final product at the end of a 4-day composting period met multiple maturity indices suggested by many researchers. The evolution of carbon dioxide during the composting process could be modelled with a modified Gompertz equation that described the bacteria growth successfully. Multivariate regression analysis was used to study the effects of operating parameters on the carbon conversion. The response surface contour plots were constructed using the regression equation for the examination of the dependence of carbon conversion on operating parameters. The maximum carbon conversion of 14.54% was obtained when the percentage of seeding was set at 14.5%, the air suction rate was set at 2.6 L kg(-1) dry-solid min(-1), and the agitator operated half of the time, alternating on and off for every 5 min. Future work will focus on the application of the data and the experience gained in this work to composters of pilot and semi-commercial scales.
Collapse
Affiliation(s)
- James I Chang
- Department of Safety, Health and Environmental Engineering, National First University of Science and Technology, Kaohsiung, Taiwan, ROC.
| | | | | |
Collapse
|
27
|
Abstract
A laboratory reactor was designed to study the effects of operating parameters (air suction rate, seeding and agitation) on the composting process of a synthetic food waste made of dog food. Experimental results showed that the synthetic food waste could be composted within 4 days and the final compost passed the maturity tests. In most cases except those with 32% of seeding, the process involved two major stages of composting. The two peak temperatures between 50 and 60 degrees C occurred at 8-12th hour and 50-65th hour, respectively. Operating parameters that converted the most volatile solids and carbons in the feedstock were as follows: 1.6 l air/kg dry solid-min of air suction rate, 32% of seeding and 50% of agitation time.
Collapse
Affiliation(s)
- James I Chang
- Department of Safety, Health and Environmental Engineering, National First University of Science and Technology, Kaohsiung, Taiwan, ROC.
| | | | | |
Collapse
|
28
|
Wu KH, Shin YM, Yang CC, Ho WD, Hsu JS. Preparation and ferromagnetic properties of Ni0.5Zn0.5Fe2O4/polyaniline core–shell nanocomposites. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21384] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
29
|
Peng CT, Wu KH, Lan SJ, Tsai JJP, Tsai FJ, Tsai CH. Amino acid concentrations in cerebrospinal fluid in children with acute lymphoblastic leukemia undergoing chemotherapy. Eur J Cancer 2005; 41:1158-63. [PMID: 15911239 DOI: 10.1016/j.ejca.2005.02.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [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: 07/15/2004] [Revised: 01/27/2005] [Accepted: 02/17/2005] [Indexed: 10/25/2022]
Abstract
Cerebrospinal fluid (CSF) amino acid concentrations were measured in 45 children with acute lymphoblastic leukemia (ALL). Central nervous system (CNS) disease was absent in 34 and present in 11 (Groups L and M, respectively) at diagnosis. Thirty-two otherwise healthy children with febrile convulsions were studied for comparison. Results from this study show that glutamine levels at Day 0 were significantly higher in patients than in controls. Patients in Group M had elevated glutamine levels compared to Group L. In comparison, at Day 14, concentrations of glutamine and asparagine decreased, while glutamic acid amounts increased significantly in Group L. Glutamine levels fell at Day 42 in Group M, which may have resulted from more intensive treatment. From this study we hypothesise that higher baseline glutamine levels are indicative of a greater risk for CNS leukemia. Large-scale prospective trials are required to confirm increased baseline CSF glutamine levels in ALL patients, to identify glutamine as a marker for CNS disease and to clarify underlying mechanisms regulating glutamine in ALL.
Collapse
Affiliation(s)
- C T Peng
- Department of Pediatrics, China Medical University Hospital, No. 2, Yuh Der Road, Taichung, Taiwan.
| | | | | | | | | | | |
Collapse
|
30
|
Chang JI, Tsai JJ, Wu KH. Mathematical model for carbon dioxide evolution from the thermophilic composting of synthetic food wastes made of dog food. Waste Manag 2005; 25:1037-45. [PMID: 16243230 DOI: 10.1016/j.wasman.2005.01.018] [Citation(s) in RCA: 2] [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] [Received: 11/24/2003] [Revised: 09/20/2004] [Accepted: 01/21/2005] [Indexed: 05/05/2023]
Abstract
The impacts of the aeration and the agitation on the composting process of synthetic food wastes made of dog food were studied in a laboratory-scale reactor. Two major peaks of CO(2) evolution rate were observed. Each peak represented an independent stage of composting associated with the activities of thermophilic bacteria. CO(2) evolutions known to correlate well with microbial activities and reactor temperatures were fitted successfully to a modified Gompertz equation, which incorporated three biokinetic parameters, namely, CO(2) evolution potential, specific CO(2) evolution rate, and lag phase time. No parameters that describe the impact of operating variables are involved. The model is only valid for the specified experimental conditions and may look different with others. The effects of operating parameters such as aeration and agitation were studied statistically with multivariate regression technique. Contour plots were constructed using regression equations for the examination of the dependence of CO(2) evolution potentials on aeration and agitation. In the first stage, a maximum CO(2) evolution potential was found when the aeration rate and the agitation parameter were set at 1.75 l/kg solids-min and 0.35, respectively. In the second stage, a maximum existed when the aeration rate and the agitation parameter were set at 1.8 l/kg solids-min and 0.5, respectively. The methods presented here can also be applied for the optimization of large-scale composting facilities that are operated differently and take longer time.
Collapse
Affiliation(s)
- J I Chang
- Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung, Taiwan, ROC.
| | | | | |
Collapse
|
31
|
|
32
|
Abstract
Although cardiac complications remain the main causes of death in thalassemic patients, right heart dysfunction has been little studied and the mechanism is still unclear. Echocardiography was performed in 39 patients with beta-thalassemia major and 35 aged-matched controls. The gender, age, heart rate, blood pressure, left ventricular ejection fraction (LVEF), acceleration time (AcT) of right ventricular outflow and right ventricular ejection time (RVET), AcT/RVET, and the presence of tricuspid regurgitation (TR) were compared between the two groups. We also compared the gender, age, age at first blood transfusion, serum ferritin level, alanine aminotransferase (ALT), the presence of antibodies to hepatitis C virus, liver fibrosis, splenectomy, platelet counts, diabetes mellitus, arrhythmia, cardiomegaly, LVEF, AcT, RVET, AcT/RVET, and signal intensity ratio (SIR) of myocardial magnetic resonance imaging (MRI) between thalassemic patients with and without TR. The incidence of TR in thalassemic patients was significantly higher than that in the control group (30.8 vs 11.4%, p=0.03). The incidences of splenectomy (p=0.03), platelet counts (p=0.01), and SIR of myocardial MRI (p=0.03) in thalassemic patients with TR were significantly higher than in those without TR. The AcT was shorter and the AcT/RVET ratio was smaller, suggesting higher pulmonary pressure in the thalassemic patients with TR. Occurrence of TR in patients with beta-thalassemia major may be a consequence of cardiac iron deposit, thrombocytosis, splenectomy, or pulmonary hypertension.
Collapse
Affiliation(s)
- K H Wu
- Department of Pediatrics, China Medical University Hospital, 2 Yuh-Der Road, North District, Taichung, Taiwan, ROC
| | | | | | | |
Collapse
|
33
|
Abstract
From 1991 to 2000, amongst 23,886 full-term healthy Chinese babies delivered at our hospital, 2615 babies developed neonatal hyperbilirubinaemia. After excluding other causes of hyperbilirubinaemia and identifying the irregular antibodies, 15 cases of haemolytic disease of the newborn (HDN) due to maternal irregular antibodies were diagnosed; three cases were born in our hospital and 12 cases were referred. Amongst these 15 babies, six cases had HDN due to anti-E, three cases due to anti-E + c, three cases due to anti-D, one case due to anti-c and two cases due to 'Mi' antibodies reacting with MiIII phenotype cells (anti-Hil and anti-Mur). Although there were four cases of hydrops fetalis, only one of the patients expired. The prevalence of HDN caused by maternal irregular antibodies has been estimated to be 0.01%. Therefore, routine prenatal screening for irregular antibodies was not rational in the Chinese population in Taiwan. Anti-E and anti-E + c were the important irregular antibodies resulting in HDN. Although few cases of HDN due to anti-'Mi' have been reported, Anti-'Mi' is significant in regions with a high prevalence of the MiIII phenotype.
Collapse
Affiliation(s)
- K H Wu
- China Medical College Hospital, Taichung, Taiwan
| | | | | | | | | |
Collapse
|
34
|
Wu KH, Chang JS, Tsai CH, Peng CT. Combined therapy with deferiprone and desferrioxamine successfully regresses severe heart failure in patients with beta-thalassemia major. Ann Hematol 2003; 83:471-3. [PMID: 14658011 DOI: 10.1007/s00277-003-0820-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [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: 07/17/2003] [Accepted: 10/22/2003] [Indexed: 11/24/2022]
Abstract
Cardiac complications caused by iron deposition are major causes of death in patients with beta-thalassemia major. Deferiprone (L1) was found to have greater efficacy at depleting myocardial iron than desferrioxamine (DFX). Furthermore, combined therapy with L1 and DFX produced an additive or synergistic iron chelating effect. We report the successful treatment of severe heart failure in two patients with beta-thalassemia major with the combined therapy. Magnetic resonance images showed a marked recovery of signal intensity in the heart, indicating a significant reduction of iron load in the heart. No significant adverse effects were noted. Therefore, combined therapy with L1 and DFX should be considered in patients with beta-thalassemia major and cardiac complications.
Collapse
Affiliation(s)
- K H Wu
- Department of Pediatrics, China Medical University Hospital, 2 Yuh-Der Road, North District, 404 Taichung, Taiwan
| | | | | | | |
Collapse
|
35
|
Wu KH, Tsai FJ, Peng CT. Growth hormone (GH) deficiency in patients with beta-thalassemia major and the efficacy of recombinant GH treatment. Ann Hematol 2003; 82:637-40. [PMID: 12898188 DOI: 10.1007/s00277-003-0712-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [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: 04/04/2003] [Accepted: 06/03/2003] [Indexed: 10/26/2022]
Abstract
Patients with beta-thalassemia major still suffer growth retardation. After excluding patients with cortisol deficiency, hypothyroidism, hypogonadism, delayed puberty, malnutrition, severe congestive heart failure, and severely impaired liver function, 29 patients were enrolled in this study. Fifteen (52%) patients exhibited growth retardation and underwent two growth hormone (GH) provocation tests. Eight (53%) of the 15 patients had GH deficiency and were subsequently treated with subcutaneous recombinant human GH (Genotropin, Pharmacia Corporation, Sweden). Growth velocity increased from the pretreatment rate of 3.1+/-0.4 cm/year to 7.1+/-1.6 cm/yr (p<0.001) after 1 year and to 6.8+/-1.3 cm/year (p<0.001) after 2 years. Patients with growth retardation had lower insulin like growth factor-1 (p=0.001) and insulin like growth factor binding protein-3 (p=0.003) levels than those without growth retardation. In patients with beta-thalassemia major, growth retardation is a common complication and GH deficiency plays an important role. Thalassemic patients with GH deficiency can safely increase their growth velocity with recombinant human GH for 2 years; however, the effect on final height still needs to be determined.
Collapse
Affiliation(s)
- K H Wu
- Department of Pediatrics, China Medical College Hospital, 2 Yuh-Der Road, 404 Taichung, Taiwan
| | | | | |
Collapse
|
36
|
Luo CW, Juang JY, Lin JY, Wu KH, Uen TM, Gou YS. Comment on "Conductivity of underdoped YBa2Cu3O7-delta: evidence for incoherent pair correlations in the pseudogap regime". Phys Rev Lett 2003; 90:179703-179704. [PMID: 12786117 DOI: 10.1103/physrevlett.90.179703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2002] [Indexed: 05/24/2023]
|
37
|
Abstract
Anti-'Mia' is the most common alloantibody of potential clinical significance in the Taiwanese population. The Mi.III phenotype is rare among Caucasians but has a high incidence in various Oriental populations. We describe a nulliparous woman with no history of transfusions, who had hydrops foetalis at 28 weeks gestation. Foetal haemoglobin was 4.4 g dL-1, and a positive direct antiglobulin test was positive in the foetal blood. Intrauterine intravascular transfusion was given, and the baby was discharged healthy. Anti-'Mia' was identified in the maternal serum, the cord blood serum and the eluate from red cells of the cord blood. Anti-'Mia' in the maternal serum was confirmed to be anti-Mur. The polymerase chain reaction-restriction fragment length polymorphism method confirmed that both the baby and her father had the Mi.III gene. Therefore, our report documents that anti-Mur has the potential to cause hydrops foetalis.
Collapse
Affiliation(s)
- K H Wu
- China Medical College Hospital, Taichung, Taiwan
| | | | | | | | | | | | | | | |
Collapse
|
38
|
Guo MJ, Wu KH, Chu J, Zhuang YP, Zhang SL, Huang DQ, Zhang QF, Pan WQ. [Expression of chimeric protein of Plasmodium falciparum in yeast recombinant Pichia pastoris in cell-high-density fermentation]. Sheng Wu Gong Cheng Xue Bao 2001; 17:456-9. [PMID: 11702709] [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: 02/22/2023]
Abstract
The effects of cultural conditions, which were fermentation period when methanol was as sole carbon source, methanol concentration, range of pH, on the expression of the chimeric protein of Plasmodium falciparum in genetically engineered methylotrophic Pichia pastoris were investigated by shake flask experiments in this paper. The results showed: (1) fermentation period with methanol inducement is about 96 hours; (2) the optimum methanol concentration as sole carbon source is 10 g/L; (3) the range of pH is from 6.0 to 7.0. On the base of above experimental results the cell high-density fermentation had been done on the FMG-5L fermentor with multi-sensors. The results showed that the cell optical density (OD600) can reached 550 and the maximum expression level of target proteins was 780 mg/L which was 4 times higher or more than the shake flask culture's.
Collapse
Affiliation(s)
- M J Guo
- State Key Laboratory of Bioreactor Engineering, East China University of Science & Technology, Shanghai 200237, China
| | | | | | | | | | | | | | | |
Collapse
|
39
|
Abstract
Synaptic transmission at the vocal synapse, the laryngeal neuromuscular junction, of Xenopus laevis has been shown to be regulated by long-term changes in circulating estrogen. In females, high levels of circulating estrogen also accompany gonadotropin-induced ovulation and oviposition and the switch from sexually unreceptive to receptive states, including changes in vocal behaviors (ticking to rapping). Here we examine the effects of gonadotropin injection on laryngeal synaptic strength and call type. Gonadotropin acutely reduced quantal content values of laryngeal synapses in intact, adult females; the lowest values were attained by 12 h post-injection. Estrogen and progesterone levels increased following human chorionic gonadotropin (hCG) injection; the time course was similar to, but negatively correlated with, changes in synaptic strength. In ovariectomized frogs, exogenous estrogen, but not progesterone or hCG, mimicked the acute effects of hCG in weakening laryngeal synapses of intact frogs. hCG injection suppressed ticking and sometimes induced rapping. Females could tick with either strong or weakened laryngeal synapses while rapping was only produced during the weakening action of hCG. The normally strong synapses of females may enable vocal production even when laryngeal synapses are weakened by hormones that induce ovulation. In contrast to the acute effect of estrogen on weakening laryngeal synapses, juveniles required more than 2 weeks of estrogen treatment to strengthen laryngeal synapses while at least 4 weeks postovariectomy were required to weaken synapses in adult females. We conclude that acute (hours) increases in circulating levels of estrogen weaken synapses while chronic (weeks) increases strengthen laryngeal synapses.
Collapse
Affiliation(s)
- K H Wu
- Department of Biological Sciences, Columbia University, New York, NY 10027, USA.
| | | | | |
Collapse
|
40
|
Hsu YW, Pan MH, Huang CJ, Cheng CR, Wu KH, Wei TT. Comparison of inhalation induction with 2%, 4%, 6%, and 8% sevoflurane in nitrous oxide for pediatric patients. Acta Anaesthesiol Sin 2000; 38:73-8. [PMID: 11000669] [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: 02/17/2023]
Abstract
BACKGROUND Sevoflurane is almost the idealest volatile anesthetic agent regarding inhalation induction of general anesthesia. Previous studies have established a role of sevoflurane in high concentration primed in the circuit for inhalation induction in pediatric patients. However, which concentration of sevoflurane is suitable has not yet been reported. This study was designed to compare the efficiency of different concentration of sevoflurane i.e. 2%, 4%, 6%, and 8% and with N2O in 50% oxygen for induction of anesthesia in pediatric patients and at the same time to evaluate the tolerance of patients. METHODS One hundred and twenty children who were 3 to 10 years old, of ASA class I, were randomly assigned to receive either 2%, 4%, 6%, and 8% sevoflurane and N2O in 50% O2 for induction of anesthesia. The time to loss of eyelash reflex, responses of airway reflex, involuntary movement, and hemodynamic responses were recorded. RESULTS Ninety-nine children completed the study. The times to loss of eyelash reflex with 2% in sequence to 8% sevoflurane were 114 +/- 21 s, 87 +/- 11 s, 75 +/- 6 s, and 48 +/- 8 s respectively. Incidence of airway reflex response including coughing, laryngospasm, and breath holding was the highest in the 8% group (P < 0.05). Inhalation induction with sevoflurane significantly decreased systolic as well as diastolic blood pressure compared with baseline blood pressure in all the four groups. The extent of decrease of blood pressure was within 20% range of baseline blood pressure in all groups. Significant increase of heart rate was only observed in the 4% and 6% groups. CONCLUSIONS Sevoflurane 6% for inhalation induction apparently caused low incidence of adverse effects and hastened induction. We suggest that 6% sevoflurene is a concentration more practical for inhalation induction in pediatric patients.
Collapse
Affiliation(s)
- Y W Hsu
- Department of Anesthesiology, Mackay Memorial Hospital, Taipei, Taiwan, R.O.C.
| | | | | | | | | | | |
Collapse
|
41
|
Wu KH, Dai YS, Tsai MJ, Lin SC, Wang LH, Huang MT, Chiang BL. Lichen sclerosus et atrophicus, bullous morphea, and systemic lupus erythematosus: a case report. J Microbiol Immunol Infect 2000; 33:53-6. [PMID: 10806966] [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: 02/16/2023]
Abstract
Lichen sclerosus et atrophicus (LSA) rarely coexists with morphea, especially when bullae occur in lesions of morphea. Here we report the case of a 15-year-old girl with this condition, who also fulfilled four out of 11 diagnostic criteria for systemic lupus erythematosus (SLE). Tissue biopsy of different skin lesions showed LSA in the regions of bullous morphea, that has rarely been reported in the literature.
Collapse
Affiliation(s)
- K H Wu
- Department of Pediatrics, Kang-Ning Hospital, Taipei, Taiwan, ROC
| | | | | | | | | | | | | |
Collapse
|
42
|
Vizzard MA, Wu KH, Jewett IT. Developmental expression of urinary bladder neurotrophic factor mRNA and protein in the neonatal rat. Brain Res Dev Brain Res 2000; 119:217-24. [PMID: 10675771 DOI: 10.1016/s0165-3806(99)00174-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
These studies were performed to determine the developmental expression pattern of neurotrophic factor (NTF: nerve growth factor (betaNGF), brain-derived neurotrophic factor (BDNF), glial-derived neurotrophic factor (GDNF), ciliary neurotrophic factor (CNTF), neurotrophin-3 (NT-3) and NT-4 mRNA and NGF, NT-3 and NT-4 protein in the urinary bladder of the postnatal Wistar rat. It was hypothesized that NTFs may contribute to the development of the spinobulbospinal micturition reflex that represents the adult micturition pattern. Changes in NTF mRNA or protein expression in the urinary bladder at the time of development of the mature micturition reflex (postnatal days (P) 16-18) may suggest an involvement of target-derived NTFs in this maturation process. Developmental ages, prior to (P5, P10, P15) or following (P20, P30, adult P90) the development of the spinobulbospinal micturition reflex were selected and the urinary bladder was analyzed for levels of neurotrophic factor mRNA or protein. Results from ribonuclease protection assays demonstrated a similar developmental pattern among each neurotrophic factor examined. Neurotrophic factor mRNA levels increased by P10 and reach a maximum by P15. Subsequently, NTF mRNA levels declined to adult levels that were less than the earliest postnatal time examined (P5). NTF mRNA expression was significantly (p</=0.05-0.001) greater at P10, P15, P20 and P40 (NT-4 mRNA) compared to adult levels for each NTF examined except GDNF mRNA. In general, NGF, NT-3 and NT-4 urinary bladder protein levels in early postnatal development, as determined by ELISA, were similar when compared to the corresponding mRNA expression. Differences in the correlation between NT-3 and NT-4 mRNA and protein expression were demonstrated in the adult urinary bladder where significantly (p</=0. 001) greater levels of protein were revealed despite relatively low abundance of NT-3 and NT-4 mRNA. The developmental expression pattern (maximum expression at the second to third postnatal week) of NTFs in the urinary bladder is consistent with a potential role in the development of the spinobulbospinal reflex. Relatively high expression of NT-3 and NT-4 protein in the adult urinary bladder suggests a potential importance of these factors in the adult lower urinary tract.
Collapse
Affiliation(s)
- M A Vizzard
- University of Vermont College of Medicine, Departments of Neurology and Anatomy and Neurobiology, E219 Given Building, Burlington, VT 05405, USA.
| | | | | |
Collapse
|
43
|
|
44
|
Wu KH, Tsai FJ, Li TC, Tsai CH, Peng CT, Wang TR. Normal values of inner canthal distance, interpupillary distance and palpebral fissure length in normal Chinese children in Taiwan. Acta Paediatr Taiwan 2000; 41:22-7. [PMID: 10910555] [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: 02/17/2023]
Abstract
Ocular measurements, including inner canthal distance, outer canthal distance, interpupillary distance, and palpebral fissure length are important in the evaluation of congenital deformities and posttraumatic telecanthus. In this research, 4446 normal Chinese children in Taiwan were enrolled in our study. The sample of 284 full term neonates, 2742 infants and children aged from 1 month to 3 years, and 1420 preschool children were measured for inner canthal distance, outer canthal distance, interpupillary distance and palpebral fissure length. We calculated the mean value and standard deviation of the ocular measurements in normal Chinese newborns, infants and preschool children in Taiwan under 5 years. No significant sex differences were observed. Compared with previous studies, inner canthal distance, outer canthal distance and interpupillary distance in Chinese children in Taiwan were wider than those in Caucasian children, but the palpebral fissure length was not significantly different. We also found that inner canthal distance was wider than palpebral fissure length at the same age; therefore it was not correct to diagnose hypertelorism in Chinese children in Taiwan; as if an imaginary third eye could fit between the eyes. Thus, we suggest that measurements should be adjusted with normal standards specific for race. Consideration of the position of eyes is relevant for the diagnosis of a large number of syndromes.
Collapse
Affiliation(s)
- K H Wu
- Department of Pediatrics, China Medical College Hospital, Taipei, Taiwan
| | | | | | | | | | | |
Collapse
|
45
|
Man TT, Lin BC, Rau RH, Chan YL, Wu KH, Tsai PS, Cheng CR. Postoperative myocardial infarction in a patient with perioperative ST-depression--a case report. Acta Anaesthesiol Sin 1999; 37:211-4. [PMID: 10670120] [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: 02/15/2023]
Abstract
Often we ignore electrocardiogram (EKG) evidence of ischemia and no adverse events occur. However, once in a while these ischemic episodes will turn into a full-blown myocardial infarction. Therefore, studying perioperative events which tilt the balance over to postoperative myocardial infarction (PMI) can enlighten our knowledge in postoperative myocardial infarction (MI) prevention. We present a case of ST depression in perioperative EKG evolving into postoperative MI. In this paper we attempt to explore various possibilities which could have altered this patient from her ischemic state into an infracted event.
Collapse
Affiliation(s)
- T T Man
- Department of Anesthesiology, Mackay Memorial Hospital, Taipei, Taiwan, R.O.C
| | | | | | | | | | | | | |
Collapse
|
46
|
|
47
|
|
48
|
Cheng JK, Pan MH, Wu KH, Mok MS, Wei TT. Epidural phenylephrine attenuates hypotension induced by alkalinized lidocaine epidural anesthesia. Anesth Analg 1999; 88:1322-6. [PMID: 10357338 DOI: 10.1097/00000539-199906000-00023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
UNLABELLED In this double-blinded, randomized study, we examined the hemodynamic effects of lumbar epidural injection of alkalinized lidocaine with phenylephrine in 81 patients undergoing inguinal herniorrhaphy. Patients assigned to four equal groups received 20 mL of alkalinized lidocaine (17 mL of 2% lidocaine + 3 mL of 7% sodium bicarbonate) with one of four doses of phenylephrine: 0 (Group 1), 50 (Group 2), 100 (Group 3), or 200 microg (Group 4) injected via a lumbar epidural catheter. Blood pressure, heart rate, and skin temperature on the foot were recorded every 5 min for 1 h after injection and were compared among groups. Hypotension was defined as mean arterial pressure < 80% of baseline. The incidence of hypotension was 45%, 55%, 35%, and 15% in Groups 1-4, respectively. Patients in Group 4 showed the smallest reduction in blood pressure compared with Groups 1 and 2 (one-sided Fisher's exact test, P < 0.05). We conclude that the 200-microg dose of epidural phenylephrine (1:100,000 concentration) reduced the incidence of hypotension after epidural anesthesia with alkalinized lidocaine. IMPLICATIONS Hypotension after epidural anesthesia is common in general clinical practice. Phenylephrine administered epidurally in combination with alkalinized lidocaine may reduce the incidence of hypotension.
Collapse
Affiliation(s)
- J K Cheng
- Department of Anesthesia, Mackay Memorial Hospital, Taipei, Taiwan, Republic of China.
| | | | | | | | | |
Collapse
|
49
|
Man TT, Tsai PS, Rau RH, Cheng CR, Ko YP, Wu KH. Children with mucopolysaccharidoses--three cases report. Acta Anaesthesiol Sin 1999; 37:93-6. [PMID: 10410410] [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: 02/13/2023]
Abstract
The mucopolysaccharidoses (MPS) are a group of inherited disorders of metabolism, with widespread, progressive involvement and derangement of many organs and tissues. Because of their disabling nature, frequent surgical intervention for the abnormality entailed is common, and is associated with a high degree of anesthetic risks perioperatively. One of the major hazards which we find clinically is airway difficulty. Multiple factors are present in the mucopolysaccharidoses to make airway management and trachael intubation potentially hazardous. Aside from generalized infiltration and thickening of the soft tissues, the oropharynx may be obstructed by a large tongue with tonsillar hypertrophy. Also, the friable mucosa covering the nasal and oral pharynx renders these structures easily to bleed and edematous. The neck is typically short and immobile, and the cervical spine and tempromandibular joint may have a limited range of movement. From our experience, we have learned not to overlook the propensity of airway difficulty. The uniqueness of their anatomy and extremely sensitive airway often result in failed intubation and bronchospasm even after successful intubation. Recently, in Mackay Memorial Hospital we have encountered in series three pediatric cases with mucopolysaccharidoses (one Hurler and two Hunter syndromes). In this report we would like to share our experiences and to discuss the anesthetic risks and management of the MPS patients.
Collapse
Affiliation(s)
- T T Man
- Department of Anesthesiology, Mackay Memorial Hospital, Taipei, Taiwan, R.O.C
| | | | | | | | | | | |
Collapse
|
50
|
Abstract
PURPOSE Lidocaine diffuses across endotracheal tube cuffs, which may serve as a reservoir for local anesthetic to assist in the prevention of ETT-induced cough while emerging from general anesthesia. However, the rate of diffusion is slow. Two techniques, alkalization and warming, may increase the proportion of uncharged drug available for diffusion. The purpose of this study is to determine the effectiveness of warming alkalization or warming with alkalization on diffusion. METHODS Four preparations of lidocaine 4% were studied. Group (Gr) L-lidocaine (24 degrees C), Gr WL--warmed lidocaine (38 degrees C), Gr AL--alkalized lidocaine (24 degrees C), Gr WAL--warmed, alkalized lidocaine (38 degrees C). Twenty-four Mallinckrodt 8.0 ID (Mallinckrodt Critical Care Division of Mallinckrodt, Inc., Glens Falls, New York) endotracheal tube cuffs were filled with 6 ml of one of the four preparations. They were then placed in a 20 ml water bath at 38 degrees C and samples were drawn from the water bath at intervals for up to 360 min. The lidocaine concentration in each sample was determined by gas chromatography. RESULTS The highest lidocaine concentration was reached in Gr WAL (410.98 +/- 8.53 micrograms.ml-1) after 300 min and then decreased to 376.18 +/- 4.59 micrograms.ml-1 after 360 min. In Gr AL the highest concentration (235.05 +/- 2.99 micrograms.ml-1) was reached after 360 min. Lidocaine concentrations in Gr L and WL after 360 min were 3.19 +/- 1.16 micrograms.ml-1 and 4.32 +/- 2.02 micrograms.ml-1 respectively. CONCLUSION Alkalization with or without warming, but not warming alone, promotes lidocaine diffusion from endotracheal tube cuff.
Collapse
Affiliation(s)
- C J Huang
- Department of Anesthesiology, Mackay Memorial Hospital, Taipei, Taiwan.
| | | | | | | | | | | |
Collapse
|