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Chang KC, Chou JW, Wu YH, Huang PJ. Tuberculous enteritis-induced small intestinal bleeding in a kidney transplant recipient. J Postgrad Med 2022; 69:114-115. [PMID: 36453386 DOI: 10.4103/jpgm.jpgm_122_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Baumgarten KM, Pfiefle BK, Chang KC. The 'Bench Rite' Orthosis Decreases Cervical Muscle Activation During the Bench Press. S D Med 2021; 74:154-157. [PMID: 34432961] [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: 06/13/2023]
Abstract
BACKGROUND There is little data available that examines the activation of the cervical paraspinal muscles that occurs during the bench press. It is intuitive that activation of these muscles may lead to increased loads across the cervical spine and may increase the risk of injury to the intervertebral disks of the cervical spine. HYPOTHESIS The hypothesis of this study is that by supporting the cervical spine with the "Bench Rite" cervical spine orthosis, there will be less muscular activation of the cervical paraspinal muscles as determined by electromyography when performing the bench press. STUDY DESIGN Comparative electromyographic study - Level of evidence III (case-control study). METHODS Fifteen healthy subjects performed two sets (with and without the cervical orthosis) of five repetitions of a 60 percent maximum repetition on the bench press for each muscle group tested (pectoralis major, deltoid, C5 paraspinal, trapezius). Electromyography was used to determine the maximum isometric contraction and concentric contraction of each muscle with and without the cervical orthosis. The concentric contraction of each muscle group was reported as a percentage of maximum voluntary isometric contraction. RESULTS The use of the "Bench Rite" cervical spine orthosis resulted in a statistically significant decrease in muscle activation in the C5 paraspinal (37 percent; p=0.0001) and deltoid muscles (9.8 percent; p=0.001) and a significant increase in trapezius muscle activation (9.3 percent; p=0.03). No differences were found in muscle activation of the pectoralis major with or without the use of the cervical spine orthosis (0.8 percent; p=0.90). CONCLUSIONS Weightlifters may consider utilizing the "Bench Rite" cervical orthosis while performing the bench press to decrease cervical paraspinal muscle activation without impacting the muscle activation of the pectoralis major.
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Affiliation(s)
- Keith M Baumgarten
- Orthopedic Institute, Sioux Falls, South Dakota
- University of South Dakota Sanford School of Medicine, Sioux Falls, South Dakota
| | | | - K C Chang
- Orthopedic Institute, Sioux Falls, South Dakota
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Chang KC, Chuang IC, Huang YC, Wu CY, Lin WC, Kuo YL, Lee TH, Ryu SJ. Risk factors outperform intracranial large artery stenosis predicting unfavorable outcomes in patients with stroke. BMC Neurol 2019; 19:180. [PMID: 31370812 PMCID: PMC6670158 DOI: 10.1186/s12883-019-1408-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 07/22/2019] [Indexed: 12/24/2022] Open
Abstract
Background This study examined how intracranial large artery stenosis (ILAS), symptomatic and asymptomatic ILAS, and risk factors affect unfavorable outcome events after medical treatment in routine clinical practice. Methods This was a 24-month prospective observational study of consecutively recruited stroke patients. All participants underwent magnetic resonance angiography, and their clinical characteristics were assessed. Outcome events were vascular outcome, recurrent stroke, and death. Cox regression analyses were performed to identify potential factors associated with an unfavorable outcome, which included demographic and clinical characteristics, the risk factors, and stenosis status. Results The analysis included 686 patients; among them, 371 were assessed as ILAS negative, 231 as symptomatic ILAS, and 84 as asymptomatic ILAS. Body mass index (p < .05), hypertension (p = .01), and old infarction (p = .047) were factors relating to vascular outcomes. Hypertension was the only factor for recurrent stroke (p = .035). Poor glomerular filtration rate (< 30 mL/min/1.73 m2) (p = .011) and baseline National Institutes of Health Stroke Scale scores (p < .001) were significant predictors of death. Conclusions This study extended previous results from clinical trials to a community-based cohort study by concurrently looking at the presence/absence of stenosis and a symptomatic/asymptomatic stenotic artery. Substantiated risk factors rather than the stenosis status were predominant determinants of adverse outcome. Although the degree of stenosis is often an indicator for treatment, we suggest risk factors, such as hypertension and renal dysfunction, should be monitored and intensively treated.
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Affiliation(s)
- K C Chang
- Division of Cerebrovascular Diseases, Department of Neurology, Chang Gung Memorial Hospital, Linkou, Taiwan.,Discharge Planning Service Center, Chang Gung Memorial Hospital, Kaohsiung, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - I C Chuang
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Y C Huang
- Division of Cerebrovascular Diseases, Department of Neurology, Chang Gung Memorial Hospital, Linkou, Taiwan.,Department of Measurement and Statistics, Education, National University of Tainan, Tainan, Taiwan
| | - C Y Wu
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan. .,Department of Physical Medicine and Rehabilitation, Healthy Aging Research Center at Chang Gung University, Chang Gung Memorial Hospital at Linkou, 259 Wen-hwa 1st Road, Taoyuan, Taiwan.
| | - W C Lin
- Department of Radiology, Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - Y L Kuo
- Department of Radiology, Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - T H Lee
- Division of Cerebrovascular Diseases, Department of Neurology, Chang Gung Memorial Hospital, Linkou, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - S J Ryu
- Division of Cerebrovascular Diseases, Department of Neurology, Chang Gung Memorial Hospital, Linkou, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
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Xiao Y, Deng P, Chang KC, Ma Q, Qian EF, Yu JH, Cheng BW, Li CX, Jiang L. Network Analysis of Y-STR in Six Ethnic Populations in Guangxi and Its Forensic Significances. Fa Yi Xue Za Zhi 2019; 35:314-318. [PMID: 31282627 DOI: 10.12116/j.issn.1004-5619.2019.03.010] [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] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Indexed: 11/30/2022]
Abstract
Abstract Objective To explore the distribution of genetic structure of Y-SNP and Y-STR genetic markers in different ethnic groups and its application in forensic science. Methods SNaPshot minisequencing was used to detect the polymorphisms of 12 Y-SNP loci in 439 males from 6 ethnic groups, including Guangxi Han, Guangxi Jing, Guangxi Miao, Guangxi Yao, Guangxi Zhuang and Guangxi Dong. DNATyperTM Y26 kit was used to multiplex-amplify 26 Y-STR loci. The PCR products were analyzed by 3130xl genetic analyzer. The network analysis of Y-STR haplotype under the same Y-SNP haplogroup was analyzed by Network 5.0 software. Results Six haplogroups defined by 12 Y-SNP loci were detected in 6 ethnic groups, and 362 haplotypes were detected in 26 Y-STR loci. The haplotype diversity was 0.996 6. In the C haplogroup, the samples from Guangxi Yao, Guangxi Zhuang and Guangxi Dong were clustered on different branches; in the O1 haplogroup, those from Guangxi Zhuang, Guangxi Miao and Guangxi Jing were relatively independent and clustered separately; in the O2 haplogroup, some samples from Guangxi Miao and Guangxi Yao were gathered in a cluster. Conclusion Based on the Y-STR network analysis of samples with identical haplogroup of Y-SNP, some ethnic groups can be preliminarily distinguished, which could be used to infer male suspects' ethnic group through detecting their genetic markers left in the crime scene.
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Affiliation(s)
- Y Xiao
- Guangdong Zhongyi Forensic Science Center, Shenzhen 518000, Guangdong Province, China
| | - P Deng
- Zhuzhou Municipal Public Security Bureau, Zhuzhou 412007, Hunan Province, China
| | - K C Chang
- Kunming Municipal Public Security Bureau, Kunming 650034, China
| | - Q Ma
- Key Laboratory of Forensic Genetics, National Engineering Laboratory for Forensic Science, Beijing Engineering Research Center of Crime Scene Evidence Examination, Institute of Forensic Science, Ministry of Public Security, PRC, Beijing 100038, China
| | - E F Qian
- Key Laboratory of Forensic Genetics, National Engineering Laboratory for Forensic Science, Beijing Engineering Research Center of Crime Scene Evidence Examination, Institute of Forensic Science, Ministry of Public Security, PRC, Beijing 100038, China.,Institute of Forensic Medicine, Guizhou Medical University, Guiyang 550004, China
| | - J H Yu
- Zhaotong Municipal Public Security Bureau, Zhaotong 657000, Yunnan Province, China
| | - B W Cheng
- Yunnan Police Officer Academy, Kunming 650221, China
| | - C X Li
- Key Laboratory of Forensic Genetics, National Engineering Laboratory for Forensic Science, Beijing Engineering Research Center of Crime Scene Evidence Examination, Institute of Forensic Science, Ministry of Public Security, PRC, Beijing 100038, China
| | - L Jiang
- Key Laboratory of Forensic Genetics, National Engineering Laboratory for Forensic Science, Beijing Engineering Research Center of Crime Scene Evidence Examination, Institute of Forensic Science, Ministry of Public Security, PRC, Beijing 100038, China
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Yew WW, Chan DP, Chang KC. Does linezolid have a role in shortening treatment of tuberculosis? Clin Microbiol Infect 2019; 25:1060-1062. [PMID: 31238119 DOI: 10.1016/j.cmi.2019.06.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/16/2019] [Accepted: 06/17/2019] [Indexed: 10/26/2022]
Affiliation(s)
- W-W Yew
- Stanley Ho Centre for Emerging Infectious Diseases, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - D P Chan
- Stanley Ho Centre for Emerging Infectious Diseases, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - K-C Chang
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong SAR, China.
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Chen PT, Chang KC, Hu KL, Ting CK, Chan KH, Chang WK. Catheter-related right internal jugular vein thrombosis after chest surgery. Br J Anaesth 2018; 119:192-199. [PMID: 28655186 DOI: 10.1093/bja/aex133] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2017] [Indexed: 11/13/2022] Open
Abstract
Background Central venous catheters (CVCs) are frequently used for monitoring haemodynamic status and rapidly delivering fluid therapy during the peri- and postoperative periods. Indwelling CVCs are typically used 7-14 days postoperatively for additional monitoring and treatment, but patients may develop asymptomatic catheter-related thrombosis, leading to life-threatening pulmonary embolism and death. Early detection helps to avoid such complications. Methods This prospective observational study investigated the risk factors associated with catheter-related right internal jugular vein thrombosis in patients undergoing chest surgery. The study enrolled 24 patients who were scheduled to receive chest surgeries during which catheters were needed. To detect thrombus formation, Doppler ultrasound examinations from the thyroid cartilage level to the supraclavicular region were used after CVC placement and on each of the following days until the catheter was removed. Results No thrombosis was found in patients before surgery, but it appeared in 75% (18/24) after surgery. The risks of thrombosis increased with a longer duration of anaesthesia, greater amounts of bleeding, and use of postoperative ventilator support. Conclusions Earlier catheter removal may reduce the risk of catheter-related thrombosis and avoid possibly fatal complications after catheter-related thrombosis.
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Affiliation(s)
- P-T Chen
- Department of Anesthesiology, Taipei Veterans General Hospital and National Yang-Ming University, No. 201, Sec. 2, Shipai Road, Taipei 112, Taiwan, Republic of China.,College of Nursing, Taipei Medical University, Taipei, Taiwan, Republic of China
| | - K-C Chang
- Department of Anesthesiology, Far Eastern Memorial Hospital, Taipei, Taiwan, Republic of China
| | - K-L Hu
- Department of Anesthesiology, Taipei Veterans General Hospital and National Yang-Ming University, No. 201, Sec. 2, Shipai Road, Taipei 112, Taiwan, Republic of China
| | - C-K Ting
- Department of Anesthesiology, Taipei Veterans General Hospital and National Yang-Ming University, No. 201, Sec. 2, Shipai Road, Taipei 112, Taiwan, Republic of China
| | - K-H Chan
- Department of Anesthesiology, Taipei Veterans General Hospital and National Yang-Ming University, No. 201, Sec. 2, Shipai Road, Taipei 112, Taiwan, Republic of China
| | - W-K Chang
- Department of Anesthesiology, Taipei Veterans General Hospital and National Yang-Ming University, No. 201, Sec. 2, Shipai Road, Taipei 112, Taiwan, Republic of China.,Taipei Municipal Gan-Dau Hospital, Taipei, Taiwan, Republic of China
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Lee TH, Yang JT, Lee JD, Chang KC, Peng TI, Chang TY, Huang KL, Liu CH, Ryu SJ, Burlina AP. Genomic screening of Fabry disease in young stroke patients: the Taiwan experience and a review of the literature. Eur J Neurol 2018; 26:553-555. [PMID: 30103270 PMCID: PMC6585645 DOI: 10.1111/ene.13775] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Accepted: 08/06/2018] [Indexed: 11/27/2022]
Abstract
Background and purpose Fabry disease is an X‐linked disease, and enzyme‐based screening methods are not suitable for female patients. Methods In total, 1000 young stroke patients (18–55 years, 661 with ischaemic stroke and 339 with hypertensive intracerebral hemorrhage) were recruited. The Sequenom iPLEX assay was used to detect 26 Fabry related mutation genes. The frequency of Fabry disease in young stroke was reviewed and compared between Asian and non‐Asian countries. Results Two male patients with ischaemic stroke were found to have a genetic mutation of IVS4+919G>A. There was no α‐galactosidase A (GLA) gene mutation in female patients. The frequency in Asian stroke patients was 0.62% (male vs. female 0.63% vs. 0.58%) with 0.72% for ischaemic stroke and none for hemorrhagic stroke, compared to 0.88% (0.77% vs. 1.08%) with 0.83% for ischaemic stroke and 1.40% for hemorrhagic stroke reported in western countries. Conclusion IVS4+919G>A is the GLA mutation in Taiwanese young ischaemic stroke patients. Fabry disease is more frequent among non‐Asian patients compared to Asian patients.
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Affiliation(s)
- T-H Lee
- Department of Neurology, Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - J-T Yang
- College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Department of Neurosurgery, Chiayi Chang Gung Memorial Hospital, Chiayi, Taiwan
| | - J-D Lee
- College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Department of Neurology, Chiayi Chang Gung Memorial Hospital, Chiayi, Taiwan
| | - K-C Chang
- College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Department of Neurology, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - T-I Peng
- College of Medicine, Chang Gung University, Taoyuan, Taiwan.,Department of Neurology, Keelung Chang Gung Memorial Hospital, Keelung, Taiwan
| | - T-Y Chang
- Department of Neurology, Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - K-L Huang
- Department of Neurology, Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - C-H Liu
- Department of Neurology, Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - S-J Ryu
- Department of Neurology, Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - A P Burlina
- Neurological Unit, St Bassiano Hospital, Bassano del Grappa, Italy
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Lin YN, Chen YH, Chang KC. P3514Revisit stroke prevention in atrial fibrillation with end-stage renal disease: a retrospective population-based time-dependent cohort study. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Y N Lin
- China Medical University Hospital, Cardiovascular Medicine, Taichung, Taiwan ROC
| | - Y H Chen
- China Medical University Hospital, Taichung, Taiwan ROC
| | - K C Chang
- China Medical University Hospital, Cardiovascular Medicine, Taichung, Taiwan ROC
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Leung EC, Leung CC, Chang KC, Chan CK, Mok TY, Chan KS, Lau KS, Chau CH, Yee WK, Law WS, Lee SN, Au KF, Tai LB, Leung WM. Delayed diagnosis of tuberculosis: risk factors and effect on mortality among older adults in Hong Kong. Hong Kong Med J 2018; 24:361-368. [PMID: 30065120 DOI: 10.12809/hkmj177081] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 11/05/2022] Open
Abstract
OBJECTIVE To assess the risk factors and effects of delayed diagnosis on tuberculosis (TB) mortality in Hong Kong. METHODS All consecutive patients with TB notified in 2010 were tracked through their clinical records for treatment outcome until 2012. All TB cases notified or confirmed after death were identified for a mortality survey on the timing and causes of death. RESULTS Of 5092 TB cases notified, 1061 (20.9%) died within 2 years of notification; 211 (4.1%) patients died before notification, 683 (13.4%) died within the first year, and 167 (3.3%) died within the second year after notification. Among the 211 cases with TB notified after death, only 30 were certified to have died from TB. However, 52 (24.6%) died from unspecified pneumonia/sepsis possibly related to pulmonary TB. If these cases are counted, the total TB-related deaths increases from 191 to 243. In 82 (33.7%) of these, TB was notified after death. Over 60% of cases in which TB diagnosed after death involved patients aged ≥80 years and a similar proportion had an advance care directive against resuscitation or investigation. Independent factors for TB notified after death included female sex, living in an old age home, drug abuse, malignancy other than lung cancer, sputum TB smear negative, sputum TB culture positive, and chest X-ray not done. CONCLUSIONS High mortality was observed among patients with TB aged ≥80 years. Increased vigilance is warranted to avoid delayed diagnosis and reduce the transmission risk, especially among elderly patients with co-morbidities living in old age homes.
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Affiliation(s)
- E C Leung
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
| | - C C Leung
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
| | - K C Chang
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
| | - C K Chan
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
| | - T Y Mok
- Respiratory Medicine Department, Kowloon Hospital, Homantin, Hong Kong
| | - K S Chan
- Pulmonary Service, Department of Medicine, Haven of Hope Hospital, Tseung Kwan O, Hong Kong
| | - K S Lau
- Respiratory Medicine Department, Ruttonjee Hospital, Wanchai, Hong Kong
| | - C H Chau
- Tuberculosis and Chest Unit, Grantham Hospital, Wong Chuk Hang, Hong Kong
| | - W K Yee
- Department of Medicine and Geriatrics, Kwong Wah Hospital, Hong Kong
| | - W S Law
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
| | - S N Lee
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
| | - K F Au
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
| | - L B Tai
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
| | - W M Leung
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong
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Chang KC, Chan MC, Leung WM, Kong FY, Mak CM, Chen SP, Yu WC. Optimising the utility of pleural fluid adenosine deaminase for the diagnosis of adult tuberculous pleural effusion in Hong Kong. Hong Kong Med J 2017; 24:38-47. [PMID: 29269590 DOI: 10.12809/hkmj176238] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
INTRODUCTION Pleural fluid adenosine deaminase level can be applied to rapidly detect tuberculous pleural effusion. We aimed to establish a local diagnostic cut-off value for pleural fluid adenosine deaminase to identify patients with tuberculous pleural effusion, and optimise its utility. METHODS We retrospectively reviewed the medical records of consecutive adults with pleural fluid adenosine deaminase level measured by the Diazyme commercial kit (Diazyme Laboratories, San Diego [CA], United States) during 1 January to 31 December 2011 in a cluster of public hospitals in Hong Kong. We considered its level alongside early (within 2 weeks) findings in pleural fluid and pleural biopsy, with and without applying Light's criteria in multiple scenarios. For each scenario, we used the receiver operating characteristic curve to identify a diagnostic cut-off value for pleural fluid adenosine deaminase, and estimated its positive and negative predictive values. RESULTS A total of 860 medical records were reviewed. Pleural effusion was caused by congestive heart failure, chronic renal failure, or hypoalbuminaemia caused by liver or kidney diseases in 246 (28.6%) patients, malignancy in 198 (23.0%), non-tuberculous infection in 168 (19.5%), tuberculous pleural effusion in 157 (18.3%), and miscellaneous causes in 91 (10.6%). All those with tuberculous pleural effusion had a pleural fluid adenosine deaminase level of ≤100 U/L. When analysis was restricted to 689 patients with pleural fluid adenosine deaminase level of ≤100 U/L and early negative findings for malignancy and non-tuberculous infection in pleural fluid, the positive predictive value was significantly increased and the negative predictive value non-significantly reduced. Using this approach, neither additionally restricting analysis to exudates by Light's criteria nor adding closed pleural biopsy would further enhance predictive values. As such, the diagnostic cut-off value for pleural fluid adenosine deaminase is 26.5 U/L, with a sensitivity of 87.3%, specificity of 93.2%, positive predictive value of 79.2%, negative predictive value of 96.1%, and accuracy of 91.9%. Sex, age, and co-morbidity did not significantly affect prediction of tuberculous pleural effusion using the cut-off value. CONCLUSION We have established a diagnostic cut-off level for pleural fluid adenosine deaminase in the diagnosis of tuberculous pleural effusion by restricting analysis to a level of ≤100 U/L, and considering early pleural fluid findings for malignancy and non-tuberculous infection, but not Light's criteria.
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Affiliation(s)
- K C Chang
- Tuberculosis and Chest Service, Department of Health, Hong Kong
| | - M C Chan
- Department of Medicine and Geriatrics, Princess Margaret Hospital, Laichikok, Hong Kong
| | - W M Leung
- Tuberculosis and Chest Service, Department of Health, Hong Kong
| | - F Y Kong
- Department of Medicine and Geriatrics, Yan Chai Hospital, Tsuen Wan, Hong Kong
| | - C M Mak
- Chemical Pathology Laboratory, Department of Pathology, Princess Margaret Hospital, Laichikok, Hong Kong
| | - S Pl Chen
- Chemical Pathology Laboratory, Department of Pathology, Princess Margaret Hospital, Laichikok, Hong Kong
| | - W C Yu
- Department of Medicine and Geriatrics, Princess Margaret Hospital, Laichikok, Hong Kong
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Wang KM, Lin TY, Chang KC, Shieh MJ, Liu DG, Peng SY. Epidemiology of Enterobius vermicularis infection among elementary school children in Hualien, Taiwan from 2007 to 2012. Trop Biomed 2017; 34:143-149. [PMID: 33592992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Enterobius vermicularis is the most common human intestinal parasite, and its control among school children is an important public health issue. The objective of this study was to document the present situation of E. vermicularis infection in school children in Hualien. The administrative divisions in Hualien county include 13 districts (3 in a mountainous area, 10 in a rural/urban area). Between 2007 and 2012, a total of 41,191 children in 13 districts in Hualien were examined using consecutive 2-day adhesive cellophane paper perianal swabs. Our results showed Enterobius egg-positive infection rates of 5.79% (452/7,089) in 2007, 6.25% (457/7,312) in 2008, 5.37% (385/7,173) in 2009, 4.98% (330/6,804) in 2010, 4.91% (301/6,133) in 2011, and 4.68% (279/5,960) in 2012. Compared to the previously reported national average in Taiwan (range, 1.53-2.23%), the prevalence of E. vermicularis in Hualien is relatively high. The infection rates were 7.55-29.10% in mountainous areas and 0.50- 12.43% in rural/urban areas. All first and fourth grade students in elementary schools in Hualien were selected as study participants. The average infection rate of the first grade students (6.71%) was higher than that of the fourth grade students (4.23%). These results indicate that enterobiasis remains an important parasitic disease among school children in Hualien, especially those in mountainous areas.
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Affiliation(s)
- K M Wang
- Department of Laboratory Medicine, Buddhist Tzu Chi General Hospital, Hualien, Taiwan
| | - T Y Lin
- Department of Laboratory Medicine, Buddhist Tzu Chi General Hospital, Hualien, Taiwan
| | - K C Chang
- Department of Laboratory Medicine, Buddhist Tzu Chi General Hospital, Hualien, Taiwan
- Department of Laboratory Medicine and Biotechnology, Tzu Chi University, Hualien, Taiwan
| | - M J Shieh
- Department of Laboratory Medicine, Buddhist Tzu Chi General Hospital, Hualien, Taiwan
| | - D G Liu
- Department of Medical Affairs, Buddhist Tzu Chi General Hospital, Hualien, Taiwan
| | - S Y Peng
- Department of Biochemistry, School of Medicine, Tzu Chi University, Hualien, Taiwan
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12
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Dheda K, Chang KC, Guglielmetti L, Furin J, Schaaf HS, Chesov D, Esmail A, Lange C. Clinical management of adults and children with multidrug-resistant and extensively drug-resistant tuberculosis. Clin Microbiol Infect 2016; 23:131-140. [PMID: 27756712 DOI: 10.1016/j.cmi.2016.10.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [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: 08/10/2016] [Revised: 10/06/2016] [Accepted: 10/07/2016] [Indexed: 01/29/2023]
Abstract
BACKGROUND Globally there is a burgeoning epidemic of drug monoresistant tuberculosis (TB), multidrug-resistant TB (MDR-TB) and extensively drug-resistant TB (XDR-TB). Almost 20% of all TB strains worldwide are resistant to at least one major TB drug, including isoniazid. In several parts of the world there is an increasing incidence of MDR-TB, and alarmingly, almost a third of MDR-TB cases globally are resistant to either a fluoroquinolone or aminoglycoside. This trend cannot be ignored because drug-resistant TB is associated with greater morbidity compared to drug-susceptible TB, accounts for almost 25% of global TB mortality, is extremely costly to treat, consumes substantial portions of budgets allocated to national TB programmes in TB-endemic countries and is a major threat to healthcare workers, who are already in short supply in resource-poor settings. Even more worrying is the growing epidemic of resistance beyond XDR-TB, including resistance to newer drugs such as bedaquiline and delamanid, as well as the increasing prevalence of programmatically incurable TB in countries like South Africa, Russia, India and China. These developments threaten to reverse the gains already made against TB. SOURCES Articles related to MDR-TB and XDR-TB found on PubMed in all languages up to September 2016, published reviews, and files of the authors. AIM AND CONTENT To review the clinical management of adults and children with MDR- and XDR-TB with a particular emphasis on the utility of newer and repurposed drugs such as linezolid, bedaquiline and delamanid, as well as management of MDR- and XDR-TB in special situations such as in HIV-infected persons and in children. IMPLICATIONS This review informs on the prevention, diagnosis, and clinical management of MDR-TB and XDR-TB.
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Affiliation(s)
- K Dheda
- Lung Infection and Immunity Unit, Department of Medicine, Division of Pulmonology and UCT Lung Institute, University of Cape Town, Groote Schuur Hospital, Observatory, South Africa.
| | - K C Chang
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong, China
| | - L Guglielmetti
- Sanatorium, Centre Hospitalier de Bligny, Briis-sous-Forges, France; Sorbonne Université, Université Pierre et Marie Curie-Paris 6, CR7, INSERM, U1135, Centre d'Immunologie et des Maladies Infectieuses, CIMI, Team E13 (Bactériologie), Paris, France
| | - J Furin
- Harvard Medical School, Department of Global Health, and Social Medicine, Boston, MA, USA
| | - H S Schaaf
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - D Chesov
- Department of Pneumology and Allergology, State University of Medicine and Pharmacy 'Nicolae Testemitanu', Chisinau, Republic of Moldova
| | - A Esmail
- Lung Infection and Immunity Unit, Department of Medicine, Division of Pulmonology and UCT Lung Institute, University of Cape Town, Groote Schuur Hospital, Observatory, South Africa
| | - C Lange
- Division of Clinical Infectious Diseases, German Center for Infection Research (DZIF), Research Center Borstel, Borstel, Germany; International Health/Infectious Diseases, University of Lübeck, Lübeck, Germany; Department of Medicine, Karolinska Institute, Stockholm, Sweden; Department of Medicine, University of Namibia School of Medicine, Windhoek, Namibia; German Center for Infection Research, Clinical Tuberculosis Center, Borstel, Germany
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13
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Abstract
To supplement previous state-of-art reviews on anti-tuberculosis treatment and to pave the way forward with reference to the current status, we systematically reviewed published literature on clinical research on tuberculosis (TB) over the past decade in the treatment of drug-susceptible and multidrug-resistant TB (MDR-TB), with a focus on drugs, dosing factors and regimens. Our review was restricted to Phase II/III clinical trials, cohort and case-control studies, and systematic reviews of clinical studies. TB programmatic and patient behavioural factors, non-TB drugs, adjunctive surgery, new vaccines, immunotherapy, antiretroviral therapy and management of latent tuberculous infection are outside the scope of this review. An algorithm was used to systematically search PubMed for relevant articles published in English from 1 January 2005 to 31 December 2014. Articles without evaluated factors (drugs, dosing factors and regimens) or comparative analysis of specified anti-tuberculosis treatment outcomes were excluded. Of the 399 articles initially identified, 294 were excluded. The main findings of the remaining 105 articles are described under two categories: presumed drug-susceptible TB and MDR-TB. Fifty-nine articles included under drug-susceptible TB were divided into 12 subcategories: isoniazid, rifampicin, pyrazinamide, fluoroquinolones, fixed-dose combination drugs, dosing frequency, treatment phases, treatment duration, experimental regimens for pulmonary (surrogate markers vs. clinical outcomes) and extra-pulmonary TB. Forty-nine articles included under MDR-TB were divided into seven subcategories: fluoroquinolones, pyrazinamide, second-line injectable drugs, World Health Organization Group 4 and Group 5 drugs, MDR-TB regimens and novel drugs. Clinical research in the last decade and ongoing trials might furnish new paradigms for improving the treatment of this recalcitrant ancient disease.
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Affiliation(s)
- K-C Chang
- Tuberculosis and Chest Service, Department of Health, Hong Kong, China
| | - W-W Yew
- Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China
| | - G Sotgiu
- Epidemiology and Medical Statistics Unit, Department of Biomedical Sciences, University of Sassari, Sassari, Italy; Research, Medical Education and Professional Development Unit, Azienda Ospedaliero Universitaria di Sassari, Sassari, Italy
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14
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Yu YT, Tuan PH, Chang KC, Hsieh YH, Huang KF, Chen YF. Exploiting broad-area surface emitting lasers to manifest the path-length distributions of finite-potential quantum billiards. Opt Express 2016; 24:82-91. [PMID: 26832239 DOI: 10.1364/oe.24.000082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Broad-area vertical-cavity surface-emitting lasers (VCSELs) with different cavity sizes are experimentally exploited to manifest the influence of the finite confinement strength on the path-length distribution of quantum billiards. The subthreshold emission spectra of VCSELs are measured to obtain the path-length distributions by using the Fourier transform. It is verified that the number of the resonant peaks in the path-length distribution decreases with decreasing the confinement strength. Theoretical analyses for finite-potential quantum billiards are numerically performed to confirm that the mesoscopic phenomena of quantum billiards with finite confinement strength can be analogously revealed by using broad-area VCSELs.
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15
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Tseng CC, Hsiao PK, Chang KC, Cheng CC, Yiin LM, Hsieh CJ. Detection of viable antibiotic-resistant/sensitive Acinetobacter baumannii in indoor air by propidium monoazide quantitative polymerase chain reaction. Indoor Air 2015; 25:475-487. [PMID: 25283547 DOI: 10.1111/ina.12165] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 09/30/2014] [Indexed: 06/03/2023]
Abstract
Acinetobacter baumannii represents a significant cause of nosocomial infections. Therefore, we combined real-time quantitative polymerase chain reaction (PCR) with the propidium monoazide (PMA-qPCR) to assess the feasibility of detecting viable, airborne A. baumannii. The biological collection efficiencies of three samplers for collecting airborne A. baumannii were evaluated by PMA-qPCR in a chamber study. After sampling, the effects of storage in collection fluid on A. baumannii were evaluated. The results showed that the culturable ratio of A. baumannii measured using the culture method was significantly correlated with the viable ratio measured using PMA-qPCR, but was not significantly correlated with the qPCR results. It was indicated that the AGI-30 impinger and the BioSampler were much more effective than the Nuclepore filter sampler for collecting airborne A. baumannii. The storage temperature was critical for aerosol samples, as the loss of viable A. baumannii was minimized when the PMA-bound DNA was stored at -20°C or if the collected cells were stored at 4°C and subsequently processed by PMA-qPCR within 1 month. The PMA-qPCR method was also to distinguish between colistin-sensitive and colistin-resistant A. baumannii, and no colistin-sensitive A. baumannii was detected by PMA-qPCR upon treatment of the BioSampler collection medium with 2 μg/ml colistin for 5 min.
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Affiliation(s)
- C-C Tseng
- Department and Graduate Institute of Public Health, Tzu Chi University, Hualien, Taiwan
| | - P-K Hsiao
- Institute of Environmental Health, National Taiwan University, Taipei, Taiwan
| | - K-C Chang
- Department of Laboratory Medicine and Biotechnology, Tzu Chi University, Hualien, Taiwan
| | - C-C Cheng
- Department and Graduate Institute of Public Health, Tzu Chi University, Hualien, Taiwan
| | - L-M Yiin
- Department and Graduate Institute of Public Health, Tzu Chi University, Hualien, Taiwan
| | - C-J Hsieh
- Department and Graduate Institute of Public Health, Tzu Chi University, Hualien, Taiwan
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16
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Abstract
OBJECTIVE To examine the impact of immigrant populations on the epidemiology of tuberculosis in Hong Kong. DESIGN Longitudinal cohort study. SETTING Hong Kong. PARTICIPANTS Socio-demographic and disease characteristics of all tuberculosis notifications in 2006 were captured from the statutory tuberculosis registry and central tuberculosis reference laboratory. Using 2006 By-census population data, indirect sex- and age-standardised incidence ratios by place of birth were calculated. Treatment outcome at 12 months was ascertained from government tuberculosis programme record forms, and tuberculosis relapse was tracked through the notification registry and death registry up to 30 June 2013. RESULTS Moderately higher sex- and age-standardised incidence ratios were observed among various immigrant groups: 1.06 (Mainland China), 2.02 (India, Pakistan, Bangladesh), 1.59 (Philippines, Thailand, Indonesia, Nepal), and 3.11 (Vietnam). Recent Mainland migrants had a lower sex- and age-standardised incidence ratio (0.51 vs 1.09) than those who immigrated 7 years ago or earlier. Age younger than 65 years, birth in the Mainland or the above Asian countries, and previous treatment were independently associated with resistance to isoniazid and/or rifampicin. Older age, birth in the above Asian countries, non-permanent residents, previous history of treatment, and resistance to isoniazid and/or rifampicin were independently associated with poor treatment outcome (other than cure/treatment completion) at 1 year. Birth outside Hong Kong was an independent predictor of relapse following successful completion of treatment (adjusted hazard ratio=1.76; 95% confidence interval, 1.07-2.89; P=0.025). CONCLUSION Immigrants carry with them a higher tuberculosis incidence and/or drug resistance rate from their place of origin. The higher drug resistance rate, poorer treatment outcome, and excess relapse risk raise concern over secondary transmission of drug-resistant tuberculosis within the local community.
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Affiliation(s)
- C C Leung
- Tuberculosis and Chest Service, Department of Health, Wanchai Chest Clinic, 1/F, 99 Kennedy Road, Wanchai, Hong Kong
| | - C K Chan
- Tuberculosis and Chest Service, Department of Health, Wanchai Chest Clinic, 1/F, 99 Kennedy Road, Wanchai, Hong Kong
| | - K C Chang
- Tuberculosis and Chest Service, Department of Health, Wanchai Chest Clinic, 1/F, 99 Kennedy Road, Wanchai, Hong Kong
| | - W S Law
- Tuberculosis and Chest Service, Department of Health, Wanchai Chest Clinic, 1/F, 99 Kennedy Road, Wanchai, Hong Kong
| | - S N Lee
- Tuberculosis and Chest Service, Department of Health, Wanchai Chest Clinic, 1/F, 99 Kennedy Road, Wanchai, Hong Kong
| | - L B Tai
- Tuberculosis and Chest Service, Department of Health, Wanchai Chest Clinic, 1/F, 99 Kennedy Road, Wanchai, Hong Kong
| | - Eric C C Leung
- Tuberculosis and Chest Service, Department of Health, Wanchai Chest Clinic, 1/F, 99 Kennedy Road, Wanchai, Hong Kong
| | - C M Tam
- Tuberculosis and Chest Service, Department of Health, Wanchai Chest Clinic, 1/F, 99 Kennedy Road, Wanchai, Hong Kong
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17
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Chen JHK, She KKK, Kwong TC, Wong OY, Siu GKH, Leung CC, Chang KC, Tam CM, Ho PL, Cheng VCC, Yuen KY, Yam WC. Performance of the new automated Abbott RealTime MTB assay for rapid detection of Mycobacterium tuberculosis complex in respiratory specimens. Eur J Clin Microbiol Infect Dis 2015; 34:1827-32. [PMID: 26071001 DOI: 10.1007/s10096-015-2419-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 06/01/2015] [Indexed: 11/29/2022]
Abstract
The automated high-throughput Abbott RealTime MTB real-time PCR assay has been recently launched for Mycobacterium tuberculosis complex (MTBC) clinical diagnosis. This study would like to evaluate its performance. We first compared its diagnostic performance with the Roche Cobas TaqMan MTB assay on 214 clinical respiratory specimens. Prospective analysis of a total 520 specimens was then performed to further evaluate the Abbott assay. The Abbott assay showed a lower limit of detection at 22.5 AFB/ml, which was more sensitive than the Cobas assay (167.5 AFB/ml). The two assays demonstrated a significant difference in diagnostic performance (McNemar's test; P = 0.0034), in which the Abbott assay presented significantly higher area under curve (AUC) than the Cobas assay (1.000 vs 0.880; P = 0.0002). The Abbott assay demonstrated extremely low PCR inhibition on clinical respiratory specimens. The automated Abbott assay required only very short manual handling time (0.5 h), which could help to improve the laboratory management. In the prospective analysis, the overall estimates for sensitivity and specificity of the Abbott assay were both 100 % among smear-positive specimens, whereas the smear-negative specimens were 96.7 and 96.1 %, respectively. No cross-reactivity with non-tuberculosis mycobacterial species was observed. The superiority in sensitivity of the Abbott assay for detecting MTBC in smear-negative specimens could further minimize the risk in MTBC false-negative detection. The new Abbott RealTime MTB assay has good diagnostic performance which can be a useful diagnostic tool for rapid MTBC detection in clinical laboratories.
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Affiliation(s)
- J H K Chen
- Department of Microbiology, Queen Mary Hospital, The University of Hong Kong, Queen, Pokfulam, Hong Kong Special Administrative Region, China
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18
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Tsai MC, Chen CH, Tseng PL, Hung CH, Chiu KW, Wang JH, Lu SN, Lee CM, Chang KC, Yen YH, Lin MT, Chou YP, Hu TH. Comparison of renal safety and efficacy of telbivudine, entecavir and tenofovir treatment in chronic hepatitis B patients: real world experience. Clin Microbiol Infect 2015; 22:95.e1-95.e7. [PMID: 26055419 DOI: 10.1016/j.cmi.2015.05.035] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [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: 01/11/2015] [Revised: 05/17/2015] [Accepted: 05/26/2015] [Indexed: 01/10/2023]
Abstract
This study aims to assess the nephrotoxicity and efficacy of tenofovir disoproxil fumarate (tenofovir), telbivudine and entecavir. A retrospective study of 587 patients with chronic hepatitis B treated with tenofovir (n = 170), telbivudine (n = 184) and entecavir (n = 233) for at least 1 year. Renal function and efficacy were assessed. The estimated glomerular filtration rate (eGFR) decreased significantly in the tenofovir group after a mean of 17 months treatment (from 92.2 to 85.6 mL/min/1.73 m(2), p < 0.001), but increased in the telbivudine group after a mean of 32 months of treatment (from 86.1 to 95 mL/min/1.73 m(2), p < 0.001). There was no significant change in eGFR in the entecavir group after a mean of 44 months. By multivariate analysis, pre-existing renal insufficiency (p = 0.003), tenofovir (p = 0.007) and diuretic treatment (p = 0.001) were independent predictors for renal function deterioration. Cumulative virological breakthrough was 0% in tenofovir after 2 years, 3.4% in entecavir after 7 years and 22.9% in telbivudine after 5 years. Liver cirrhosis (p = 0.008) and virological breakthrough (p = 0.040) were independently associated with increased risk of hepatocellular carcinoma development. Tenofovir may lead to deterioration in renal function as assessed by serial eGFR measurements. Although telbivudine appeared to be associated with an improvement in eGFR, it was associated with high rates of virological breakthrough, which was an independent risk factor for HCC development. With low rates of virological breakthrough and preservation of renal function, entecavir could be the best choice among these three agents.
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Affiliation(s)
- M-C Tsai
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan; Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Taiwan
| | - C-H Chen
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan
| | - P-L Tseng
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan; Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Taiwan
| | - C-H Hung
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan
| | - K-W Chiu
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan
| | - J-H Wang
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan
| | - S-N Lu
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan; Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Taiwan
| | - C-M Lee
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan; Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Taiwan
| | - K-C Chang
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan
| | - Y-H Yen
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan; Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Taiwan
| | - M-T Lin
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan; Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Taiwan
| | - Y-P Chou
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan
| | - T-H Hu
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital-Kaohsiung Medical Centre, Taiwan.
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19
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Lin YN, Lin CL, Chang KC, Kao CH. Increased subsequent risk of acute coronary syndrome for patients with dermatomyositis/polymyositis: a nationwide population-based retrospective cohort study. Scand J Rheumatol 2014; 44:42-7. [PMID: 25205256 DOI: 10.3109/03009742.2014.918652] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES The aim of this study was to explore the possible association between dermatomyositis/polymyositis (DM/PM) and subsequent acute coronary syndrome (ACS) risk. METHOD We used data from the National Health Insurance (NHI) system of Taiwan to address the research topic. The exposure cohort contained 2029 patients with new diagnoses of DM/PM. Each patient was randomly frequency-matched according to sex and age with four participants from the general population who did not have a history of ACS at the index date (control group). Cox proportional hazard regression analyses were conducted to estimate the relationship between DM/PM and subsequent ACS risk. RESULTS Among patients with DM/PM, the overall risk for developing subsequent ACS was significantly higher than that of the control group [adjusted hazard ratio (aHR) 1.98, 95% confidence interval (CI) 1.17-3.35]. Further analysis indicated a higher risk in patients who were male, older, or diagnosed with comorbidities. CONCLUSIONS The findings from this population-based retrospective cohort study suggest that DM/PM is associated with an increased subsequent ACS risk.
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Affiliation(s)
- Y-N Lin
- Division of Cardiology, Department of Internal Medicine, China Medical University Hospital , Taichung , Taiwan
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20
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Tsai YW, Ho CI, Chen JY, Chang KC, Weng YM, Chen SY, Li WC. Impact of body composition on estimated glomerular filtration rate in relatively healthy adults in Taiwan. Eur J Clin Nutr 2014; 69:34-9. [PMID: 24781688 DOI: 10.1038/ejcn.2014.66] [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] [Received: 09/29/2013] [Revised: 12/21/2013] [Accepted: 02/21/2014] [Indexed: 01/10/2023]
Abstract
BACKGROUND/OBJECTIVES Chronic kidney diseases are associated with changes in cardiometabolic risk (CMR) factors in which body composition parameters have been used as sensitive predictors. This study aimed to explore the associations of anthropometric indicators, body fat (BF), body mass index (BMI) and waist circumference (WC) with estimated glomerular filtration rate (eGFR) in an adult healthy Chinese population. SUBJECTS/METHODS A cross-sectional study was conducted for the subjects undergoing annual health examinations. The associations of subjects with body composition parameters were analyzed using the cutoff values of BMI, BF and WC in accordance with the criteria for Asian or Taiwanese population by gender. RESULTS A total of 3473 subjects, aged 30-45 years, who received physical examinations in 2007 were analyzed. The levels of CMR factors were significantly higher in males than in females. eGFR was negatively associated with BMI but positively related to BF. The additional roles of BMI and WC were observed in the subjects who were categorized according to BF. Females with normal weight obese were associated with increased eGFR, whereas a higher eGFR was found in males with low/normal BF and BMI or normal WC. CONCLUSIONS Our data provided evidence that anthropometric parameters were associated with changes of eGFR in relatively healthy adults. Higher eGFR was observed in females with normal weight obese in whom hyperfiltration may be suspected, and this finding deserves further studies.
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Affiliation(s)
- Y-W Tsai
- Department of Family Medicine, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - C-I Ho
- Department of Family Medicine, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - J-Y Chen
- Department of Family Medicine, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - K-C Chang
- Department of Family Medicine, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - Y-M Weng
- Department of Emergency Medicine, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - S-Y Chen
- Department of Emergency Medicine, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - W-C Li
- Department of Occupation Medicine, Chang-Gung Memorial Hospital, Chiayi, Taiwan
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21
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Liang CM, Hu TH, Lu SN, Hung CH, Huang CM, Wang JH, Yen YH, Chen CH, Chang KC, Tsai MC, Kuo YH, Lee CM. Role of hepatitis C virus substitutions and interleukin-28B polymorphism on response to peginterferon plus ribavirin in a prospective study of response-guided therapy. J Viral Hepat 2013; 20:761-9. [PMID: 24168255 DOI: 10.1111/jvh.12097] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Accepted: 01/25/2013] [Indexed: 12/29/2022]
Abstract
Recent studies have indicated that amino acid (aa) substitutions in the core region and NS5A interferon sensitivity-determining region (ISDR) of hepatitis C virus (HCV) as well as genetic polymorphisms in the interleukin-28B (IL-28B) locus affect the outcome of interferon (IFN)-based therapies. We aimed to investigate the role of these factors on response to peginterferon plus ribavirin in a prospective study of response-guided therapy. The aa sequences in core region and ISDR and rs12979860 genotypes were analysed in 115 HCV-1 patients. The treatment was 24 weeks for patients achieving a rapid virological response (RVR), 48 weeks for those with an early virological response (EVR) and early terminated in those without an EVR. A sustained virological response (SVR) was achieved in 82% of 34 RVR patients, 45% of 74 EVR patients and 0% of seven non-EVR patients. Logistic regression analysis showed that ISDR mutation (≥2) [odds ratio(OR): 6.024], double core 70/91 mutations (OR: 0.136), and platelet counts≥15×10(4) /μL (OR: 3.119) were independent pretreatment factors associated with SVR. Apart from rs12979860 CC genotype, low viral load and ISDR mutation (≥2) were significant factors predictive of RVR. Combination of rs12979860 genotype and baseline viral characteristics (viral load and core/ISDR mutations) could predict RVR and SVR with positive predictive value of 100% and 91%, and negative predictive value of 80% and 54%, respectively. In conclusion, pretreatment screening rs12979860 genotype and aa substitutions in the core region and ISDR could help identifying patients who are good candidates for peginterferon plus ribavirin therapy.
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Affiliation(s)
- C-M Liang
- Division of Hepatogastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
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22
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Chang KC, Samartzis D, Fuego SM, Dhatt SS, Wong YW, Cheung WY, Luk KDK, Cheung KMC. The effect of excision of the posterior arch of C1 on C1/C2 fusion using transarticular screws. Bone Joint J 2013; 95-B:972-6. [PMID: 23814252 DOI: 10.1302/0301-620x.95b7.30598] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Transarticular screw fixation with autograft is an established procedure for the surgical treatment of atlantoaxial instability. Removal of the posterior arch of C1 may affect the rate of fusion. This study assessed the rate of atlantoaxial fusion using transarticular screws with or without removal of the posterior arch of C1. We reviewed 30 consecutive patients who underwent atlantoaxial fusion with a minimum follow-up of two years. In 25 patients (group A) the posterior arch of C1 was not excised (group A) and in five it was (group B). Fusion was assessed on static and dynamic radiographs. In selected patients CT imaging was also used to assess fusion and the position of the screws. There were 15 men and 15 women with a mean age of 51.2 years (23 to 77) and a mean follow-up of 7.7 years (2 to 11.6). Stable union with a solid fusion or a stable fibrous union was achieved in 29 patients (97%). In Group A, 20 patients (80%) achieved a solid fusion, four (16%) a stable fibrous union and one (4%) a nonunion. In Group B, stable union was achieved in all patients, three having a solid fusion and two a stable fibrous union. There was no statistically significant difference between the status of fusion in the two groups. Complications were noted in 12 patients (40%); these were mainly related to the screws, and included malpositioning and breakage. The presence of an intact or removed posterior arch of C1 did not affect the rate of fusion in patients with atlantoaxial instability undergoing C1/C2 fusion using transarticular screws and autograft.
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Affiliation(s)
- K C Chang
- DEMC Specialist Hospital, 4, JLN IKHTISAS, Seksyen 14, 40000 Shah Alam, Selangor, Malaysia
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Wei W, He HB, Zhang WY, Zhang HX, Bai JB, Liu HZ, Cao JH, Chang KC, Li XY, Zhao SH. miR-29 targets Akt3 to reduce proliferation and facilitate differentiation of myoblasts in skeletal muscle development. Cell Death Dis 2013; 4:e668. [PMID: 23764849 PMCID: PMC3698551 DOI: 10.1038/cddis.2013.184] [Citation(s) in RCA: 136] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
MicroRNAs (miRNAs) are a type of endogenous noncoding small RNAs involved in the regulation of multiple biological processes. Recently, miR-29 was found to participate in myogenesis. However, the underlying mechanisms by which miR-29 promotes myogenesis have not been identified. We found here that miR-29 was significantly upregulated with age in postnatal mouse skeletal muscle and during muscle differentiation. Overexpression of miR-29 inhibited mouse C2C12 myoblast proliferation and promoted myotube formation. miR-29 specifically targeted Akt3, a member of the serine/threonine protein kinase family responsive to growth factor cell signaling, to result in its post-transcriptional downregulation. Furthermore, knockdown of Akt3 by siRNA significantly inhibited the proliferation of C2C12 cells, and conversely, overexpression of Akt3 suppressed their differentiation. Collectively and given the inverse endogenous expression pattern of rising miR-29 levels and decreasing Akt3 protein levels with age in mouse skeletal muscle, we propose a novel mechanism in which miR-29 modulates growth and promotes differentiation of skeletal muscle through the post-transcriptional downregulation of Akt3.
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Affiliation(s)
- W Wei
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, PRC
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Tsai MC, Chen CH, Hung CH, Lee CM, Chiu KW, Wang JH, Lu SN, Tseng PL, Chang KC, Yen YH, Hu TH. A comparison of efficacy and safety of 2-year telbivudine and entecavir treatment in patients with chronic hepatitis B: a match-control study. Clin Microbiol Infect 2013; 20:O90-O100. [PMID: 23659493 DOI: 10.1111/1469-0691.12220] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 02/13/2013] [Accepted: 03/05/2013] [Indexed: 01/10/2023]
Abstract
There are limited data comparing the clinical outcomes between telbivudine and entecavir. We consecutively enrolled 115 telbivudine-naive and 115 entecavir-naive chronic hepatitis B patients, who were matched for age, sex, hepatitis B e antigen (HBeAg) status and cirrhosis, and treated for at least 2 years or less than 2 years but had developed resistance. Except for the rate of HBeAg seroconversion, which was similar, patients in the entecavir group had better clinical outcomes than those in the telbivudine group for alanine aminotransferase normalization (85.2% vs 78.4%, p <0.048), undetectable HBV DNA (96.5% vs 74.8%, p <0.001), and viral resistance (0.9% vs 21.7%, p <0.001) after 2 years of treatment, After applying roadmap or super-responders concepts, entecavir still had better outcomes than telbivudine in undetectable HBV DNA and viral resistance. The cumulative incidence of hepatocellular carcinoma development was similar between telbivudine-naive and entecavir-naive patients (p 0.565). In renal function analysis, there were significantly more patients with estimated glomerular filtration rate (eGFR) category improvement in both the telbivudine and entecavir groups at year 1 (p 0.006 and p 0.047, respectively). The rate of virological improvement was significantly higher with entecavir than with telbivudine after 2 years of treatment, whether applying the concepts of roadmap or super-responders. The incidence of hepatocellular carcinoma was similar between telbivudine and entecavir. Both telbivudine and entecavir were associated with eGFR improvement, especially in patients with renal insufficiency.
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Affiliation(s)
- M-C Tsai
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Chang Gung Memorial Hospital Kaohsiung Medical Centre, Kaohsiung, Taiwan; Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Kaohsiung, Taiwan
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Su JJ, Chang YC, Chen YJ, Chang KC, Lee SY. Hydrogen sulfide removal from livestock biogas by a farm-scale bio-filter desulfurization system. Water Sci Technol 2013; 67:1288-1293. [PMID: 23508153 DOI: 10.2166/wst.2013.696] [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: 06/01/2023]
Abstract
A farm-scale biogas desulfurization system was designed and tested for H2S removal efficiency from livestock biogas. This work assesses the H2S removal efficiency of a novel farm-scale biogas bio-desulfurization system (BBS) operated for 350 days on a 1,000-head pig farm. Experimental data demonstrated that suitable humidity and temperature can help sulfur-oxidizing bacteria to form active bio-films on the bio-carriers. The daily average removal rate increased to 879.16 from 337.75 g-H2S/d with an average inlet H2S concentration of 4,691 ± 1,532 mg/m(3) in biogas. Thus, the overall (0-350 days) average H2S removal efficiency exceeded 93%. The proposed BBS overcomes limitations of H2S in biogas when utilizing pig farm biogas for power generation and other applications.
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Affiliation(s)
- J-J Su
- Department of Animal Science and Technology, National Taiwan University, Taipei, Chinese Taiwan.
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Liu CY, Tseng LM, Chang KC, Chu PY, Su JC, Shiau CW, Chen KF. Abstract P6-11-05: Novel sorafenib-derivatives induce apoptosis in breast cancer cells through STAT3 inhibition. Cancer Res 2012. [DOI: 10.1158/0008-5472.sabcs12-p6-11-05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: STAT3 has emerged as a novel potential anti-cancer target and its signaling is constitutively activated in various cancers including breast cancer. Our previous study has shown that STAT3 is a major kinase-independent target of sorafenib in HCC. (J Hepatol. 2011). Moreover, recent evidence has shown that p-STAT3 can be down-regulated by phosphatases, such as SHP-1 tyrosine phosphatase. We have designed and synthesized a series of sorafenib analogues devoid of sorafenib's kinase inhibition activity, some of which showed stronger p-STAT3 inhibition and apoptosis-inducing effects than sorafenib in HCC cells (Eur J Med Chem. 2011). Here, we tested the efficacy of novel sorafenib derivatives, SC-1 and SC-43, in breast cancer cells and examined the drug mechanism.
Methods: Six Breast cancer cell lines were used for in vitro studies. Cell viability was examined by MTT-assay. Apoptosis was examined by both flow cytometry and Western blot. Signal transduction pathways in cells were assessed by Western Blot. SHP-1 activity was measured by a phosphatase activity assay kit. In vivo efficacy of Sorafenib, and sorafenib derivatives were tested in xenografted nude mice.
Results: Sorafenib, SC-1 and SC-43 induced apoptosis in association with down-regulation of P-STAT3 and its downstream proteins Cyclin D1 and survivin in a dose-dependent manner in breast cancer cell lines (HCC-1937, MDA MB-468, MDA MB-231, MDA MB-453, SKBR-3, MCF-7) and the apoptotic effects induced by SC-1 and SC-43 were more potent than Sorafenib. Over-expression of STAT3 in MDA MB-468 cells protected cells from apoptosis induced by sorafenib, SC-1 and SC-43. Moreover, SC-1 and SC-43 up-regulated higher SHP-1 activity than sorafenib by in vitro phosphatase assays. Knockdown of SHP-1 by siRNA reduced apoptosis induced by SC-1 and SC-43. Importantly, SC-1 and SC-43 showed in vivo efficacy in MDA-468 xenografted tumor.
Conclusions: Our data indicated that inhibiton of p-STAT3 by up-regulating SHP-1 activity mediated apoptotic effects of sorafenib, SC-1 and SC-43 in breast cancer cells.
Citation Information: Cancer Res 2012;72(24 Suppl):Abstract nr P6-11-05.
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Affiliation(s)
- C-Y Liu
- Taipei Veterans General Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; St. Martin De Porres Hospital, Chia-Yi, Taiwan; National Taiwan University Hospital, Taipei, Taiwan
| | - L-M Tseng
- Taipei Veterans General Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; St. Martin De Porres Hospital, Chia-Yi, Taiwan; National Taiwan University Hospital, Taipei, Taiwan
| | - K-C Chang
- Taipei Veterans General Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; St. Martin De Porres Hospital, Chia-Yi, Taiwan; National Taiwan University Hospital, Taipei, Taiwan
| | - P-Y Chu
- Taipei Veterans General Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; St. Martin De Porres Hospital, Chia-Yi, Taiwan; National Taiwan University Hospital, Taipei, Taiwan
| | - J-C Su
- Taipei Veterans General Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; St. Martin De Porres Hospital, Chia-Yi, Taiwan; National Taiwan University Hospital, Taipei, Taiwan
| | - C-W Shiau
- Taipei Veterans General Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; St. Martin De Porres Hospital, Chia-Yi, Taiwan; National Taiwan University Hospital, Taipei, Taiwan
| | - K-F Chen
- Taipei Veterans General Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; St. Martin De Porres Hospital, Chia-Yi, Taiwan; National Taiwan University Hospital, Taipei, Taiwan
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Leung CC, Lam TH, Yew WW, Law WS, Tam CM, Chang KC, McGhee S, Tam SY, Chan KF. Obstructive lung disease does not increase lung cancer mortality among female never-smokers in Hong Kong. Int J Tuberc Lung Dis 2012; 16:546-52. [PMID: 22325953 DOI: 10.5588/ijtld.11.0573] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING High lung cancer mortality is observed among female never-smokers in Hong Kong. OBJECTIVE To examine the relationship between obstructive lung disease (chronic obstructive pulmonary disease and/or asthma) and lung cancer mortality by sex and smoking status. DESIGN A cohort of elderly clients (aged ≥65 years) in a health maintenance programme were followed prospectively through linkage with the territory-wide death registry for causes of death, using identity card number as the unique identifier. RESULTS After 516,055 person-years of follow-up, respectively 1297, 872 and 1908 deaths were caused by lung cancer, other tobacco-related malignancies and non-tobacco-related malignancies. In the overall analysis, obstructive lung disease was independently associated with mortality due to lung cancer (aHR 1.86, P < 0.001) after adjustment for potential confounders. However, no association was detected among female never-smokers (HR 0.97, P = 0.909), in sharp contrast with female ever-smokers, male never-smokers and male ever-smokers (HR 1.98, 2.34 and 2.09, respectively, P from 0.047 to <0.001). Consistent results were observed after exclusion of all deaths in the initial 3 years. CONCLUSION Obstructive lung disease exerted differential effects on lung cancer mortality across different sex and smoking subgroups in this Asian population, with a conspicuous absence of effect among female never-smokers.
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Affiliation(s)
- C C Leung
- TB and Chest Service, Department of Health, Hong Kong, China.
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Abstract
IN THIS YEAR-IN-REVIEW ARTICLE, we summarizes 104 articles published on tuberculosis in the International Journal of Tuberculosis and Lung Disease from the January to the August issue in 201, and arbitrarily categorise them according to three subject areas: active TB, latent TB infection (LTBI),and operational research.
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Affiliation(s)
- K-C Chang
- Tuberculosis and Chest Service, Department of Health, Hong Kong SAR, China
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Wang YC, Lo PH, Chang SS, Lin JJ, Wang HJ, Chang CP, Hsieh LC, Chen YP, Chen WK, Chen CH, Chang KC, Hung JS. Reduced door-to-balloon times in acute ST-elevation myocardial infarction patients undergoing primary percutaneous coronary intervention. Int J Clin Pract 2012; 66:69-76. [PMID: 22171906 DOI: 10.1111/j.1742-1241.2011.02775.x] [Citation(s) in RCA: 7] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Primary percutaneous coronary intervention (PCI) in patients with ST-elevation myocardial infarction (STEMI) significantly reduces mortality and morbidity, particularly when door-to-balloon (D2B) time is < 90 min. We sought to minimize preventable delays by instituting an on-site cardiology team-based approach in the emergency department (ED). METHODS The on-site group comprised 146 consecutive patients with STEMI undergoing primary PCI after implementation of the on-site strategy. This new patient care model was compared with the conventional care administered before instituting the on-site cardiology team-based strategy in ED, which included 90 patients (interim group) receiving primary PCI at a catheterization room in the same building as the ED, and 147 patients (pre-on-site group) undergoing primary PCI at a catheterization room two blocks away from the ED. RESULTS Median D2B time decreased from 107 min in the pre-on-site group to 72 min in the interim group, and to 47 min in the on-site group, respectively (p < 0.001). The percentage of D2B times < 90 min increased from 34% to 78% and 96%, respectively among the three groups (p < 0.001). Hospitalization costs were significantly reduced in the on-site and interim vs. pre-on-site groups ($5944, $5999, and $6581, respectively; p = 0.008). In-hospital mortality did not differ significantly among the three groups (4.8%, 2.2%, and 6.1%, respectively; p = 0.387). CONCLUSIONS Institution of an on-site cardiology team-based approach in the ED significantly reduces D2B time in STEMI patients eligible for primary PCI.
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Affiliation(s)
- Y-C Wang
- Division of Cardiology, Department of Medicine, China Medical University Hospital, Taichung, Taiwan
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Kam SC, Do JM, Choi JH, Jeon BT, Roh GS, Chang KC, Hyun JS. The relaxation effect and mechanism of action of higenamine in the rat corpus cavernosum. Int J Impot Res 2011; 24:77-83. [PMID: 21956762 DOI: 10.1038/ijir.2011.48] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Higenamine mediates cardiotonic, vascular relaxation and bronchodilator effects. The relaxation effects and the mechanism of action of higenamine on the rat corpus cavernosum (CC) were assessed to investigate the effect of higenamine on penile erection. Strips of CC and aorta were used in organ baths for isometric tension studies. Tension was measured with isometric force transducers, and muscle relaxation was expressed as the percent decrease in precontraction induced by phenylephrine (PE). The relaxation reactions were investigated in an endothelial-denuded group and groups pretreated with N(G)-nitro-L-arginine methyl ester (NO synthesis inhibitor), propranolol (β-receptor blocker), indomethacin (COX inhibitor), glibenclamide (K(+)(ATP) channel inhibitor), 4-aminopyridine (membrane potential-dependent potassium channel inhibitor) and methylene blue (guanylyl cyclase inhibitor) for 30 min. Intracavernous pressure (ICP) was assessed in rats after the intravenous administration of higenamine, and changes in guanosine 3',5'-cyclic monophosphate and adenosine 3',5'-cyclic monophosphate (cAMP) concentrations were measured on the basis of the higenamine concentration. Also, the combined reaction of higenamine and the phosphodiesterase type-5 (PDE-5) inhibitors was assessed. Higenamine induced relaxation of the CC and the aortic strips precontracted with PE in a dose-dependent manner. The CC was significantly more relaxed than the aortic rings in response to the same higenamine concentration (P<0.05). The CC relaxation reaction was suppressed by the β-receptor blocker propranolol. The cAMP concentration increased gradually with increased higenamine concentration (P<0.05). The ICP also increased with increased higenamine concentration in vivo (P<0.05). In the group pretreated with 10(-7) M higenamine, the relaxation reaction of CC induced by the PDE-5 inhibitor increased significantly, compared with CC exposed to the PDE-5 inhibitor but not pretreated with higenamine (P<0.05). In conclusion, higenamine induced relaxation of the rat CC in a dose-dependent manner. The effect may be mediated through β-adrenoceptors. The results suggest that higenamine may be valuable as a new lead compound for treating erectile dysfunction.
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Affiliation(s)
- S C Kam
- Department of Urology, Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju, Korea
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Abstract
Cardiac involvement in systemic lupus erythematosus (SLE) has been well described. However, sinus node involvement with profound sinus bradycardia as an early manifestation of adult SLE has not been reported. A 27-year-old previously healthy female was admitted due to intermittent fever for 4 days. SLE was diagnosed based on clinical manifestations and laboratory data. Profound sinus bradycardia (heart rate = 41/min) with weakness was noted during hospitalization. ECG abnormalities completely resolved after a high-dose intravenous steroid infusion. Sinus node involvement with significant bradycardia is one of the possible complications in the early stage of adult SLE. Close cardiovascular monitoring and serial ECGs are suggested for early detection of this serious complication of adult SLE.
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Affiliation(s)
- Yn Lin
- Department of Internal Medicine, China Medical University Hospital, Taichung, Taiwan
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Affiliation(s)
- K C Chang
- DEPARTMENT OF ANTHROPOLOGY AND PEABODY MUSEUM OF NATURAL HISTORY, YALE UNIVERSITY
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Kim HJ, Kim MY, Hwang JS, Kim HJ, Lee JH, Chang KC, Kim JH, Han CW, Kim JH, Seo HG. PPARdelta inhibits IL-1beta-stimulated proliferation and migration of vascular smooth muscle cells via up-regulation of IL-1Ra. Cell Mol Life Sci 2010; 67:2119-30. [PMID: 20221783 DOI: 10.1007/s00018-010-0328-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Revised: 02/07/2010] [Accepted: 02/19/2010] [Indexed: 11/26/2022]
Abstract
Activation of peroxisome proliferator-activated receptor (PPAR) delta by GW501516, a specific PPARdelta ligand, significantly inhibited interleukin (IL)-1beta-induced proliferation and migration of vascular smooth muscle cells (VSMCs). This effect of GW501516 was dependent on transforming growth factor-beta, and was mediated through the up-regulation of IL-1 receptor antagonist. The inhibitory effect of GW501516 on VSMC proliferation was associated with cell cycle arrest at the G1 to S phase transition, which was accompanied by the induction of p21 and p53 along with decreased cyclin-dependent kinase 4 expression. Inhibition of cell migration by GW501516 was associated with the down-regulation of matrix metalloproteinase (MMP)-2 and MMP-9 in IL-1beta-treated VSMCs. Inhibition of extracellular signal-regulated kinase significantly reduced the GW501516-mediated inhibition of IL-1beta-stimulated VSMC proliferation. These results suggest that PPARdelta plays an important role in the pathophysiology of diseases associated with the proliferation and migration of VSMCs.
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Affiliation(s)
- H J Kim
- Department of Pharmacology, Gyeongsang Institute of Health Science, Gyeongsang National University School of Medicine, 92 Chilam-Dong, Jinju, 660-751, Korea
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Chang KC, Samartzis D, Luk KDK, Cheung KMC. Cervical spine disease in Asian populations. Hong Kong Med J 2010; 16:69-70. [PMID: 20124579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Affiliation(s)
- K C Chang
- Department of Orthopaedic and Traumatology, Queen Mary Hospital, The University of Hong Kong, Pokfulam, Hong Kong
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35
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Pierce MS, Chang KC, Hennessy D, Komanicky V, Sprung M, Sandy A, You H. Surface X-ray speckles: coherent surface diffraction from Au(001). Phys Rev Lett 2009; 103:165501. [PMID: 19905707 DOI: 10.1103/physrevlett.103.165501] [Citation(s) in RCA: 5] [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] [Received: 06/15/2009] [Indexed: 05/28/2023]
Abstract
We present coherent speckled x-ray diffraction patterns obtained from a monolayer of surface atoms. We measured both the specular anti-Bragg reflection and the off-specular hexagonal reconstruction peak for the Au(001) surface reconstruction. We observed fluctuations of the speckle patterns even when the integrated intensity appears static. By autocorrelating the speckle patterns, we were able to identify two qualitatively different surface dynamic behaviors of the hex reconstruction depending on the sample temperature.
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Affiliation(s)
- M S Pierce
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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Chang KC, Leung CC, Yew WW, Lau TY, Leung WM, Tam CM, Lam HC, Tse PS, Wong MY, Lee SN, Wat KI, Ma YH. Newer fluoroquinolones for treating respiratory infection: do they mask tuberculosis? Eur Respir J 2009; 35:606-13. [PMID: 19717477 DOI: 10.1183/09031936.00104209] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Possible masking of tuberculosis (TB) in treatment of community-acquired respiratory infection by newer fluoroquinolones has not been examined in randomised controlled trials. We undertook a randomised, open-label controlled trial involving adults with community-acquired pneumonia or infective exacerbation of bronchiectasis encountered in government chest clinics in Hong Kong. 427 participants were assigned by random permutated blocks of 20 to receive either amoxicillin clavulanate (n = 212) or moxifloxacin (n = 215). Participants were followed for 1 yr for active pulmonary TB. Excluding three participants with positive baseline culture, 13 developed active pulmonary TB: 10 (4.8%) out of 210 were given amoxicillin clavulanate, and three (1.4%) out of 214 were given moxifloxacin. The difference was significant by both proportion and time-to-event analysis. Post hoc analysis showed a significant decrease in the proportion with active pulmonary TB from 4.8% to 2.4% and 0% among participants given amoxicillin clavulanate (n = 210), moxifloxacin for predominantly 5 days (n = 127) and 10 days (n = 87), respectively. The log rank test for trend also showed a significant difference between the three subgroups. Regression models reaffirmed the linear effect; the adjusted odds ratio (95% confidence interval) of active pulmonary TB after moxifloxacin exposure up to predominantly 10 days was 0.3 (0.1-0.9). Newer fluoroquinolones appear to mask active pulmonary TB.
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Affiliation(s)
- K C Chang
- Centre for Health Protection, Dept of Health, Hong Kong SAR, China.
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Chang KC, Leung CC, Yew WW, Lam FM, Ho PL, Chau CH, Cheng VCC, Yuen KY. Analyses of fluoroquinolones and Clostridium difficile-associated diarrhoea in tuberculosis patients. Int J Tuberc Lung Dis 2009; 13:341-346. [PMID: 19275794] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
Abstract
SETTING Systematic studies of fluoroquinolones (FQs) and Clostridium difficile-associated diarrhoea (CDAD) are scarce among tuberculosis (TB) patients, in whom fluoroquinolones (FQs) are increasingly used. OBJECTIVE To evaluate the relationship between FQs and CDAD among TB patients. DESIGN Retrospective cohort and nested case-control analyses were conducted among 3319 hospital patients on anti-tuberculosis treatment from 1999 to 2005. Each case of CDAD was matched by three sex- and age-matched controls randomly selected from the rest of the cohort. Not every case was confirmed by C. difficile cytotoxins. RESULTS Among 38 cases studied, the incidence of CDAD, which was 28.2 (95%CI 20.3-38.3) per 100 000 patient-days overall, increased from 12.9 (95%CI 5.8-25.3) for patients aged <60 years to 26.6 (95%CI 15.5-42.8) for those aged between 60 and 79 years, and 66.9 (95%CI 39.8-106.1) for those aged >79 years. Univariate analysis showed a significant association between CDAD and age, FQs, non-FQ antibiotics, serum albumin level, duration of hospital stay and nasogastric feeding. Only duration of hospital stay and nasogastric feeding remained significant on multivariable analysis. CONCLUSION The risk of CDAD due to FQs among TB patients is probably modest after controlling for sex, age, non-FQ antibiotics, serum albumin level, duration of hospital stay and nasogastric feeding.
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Affiliation(s)
- K C Chang
- Department of Health, Tuberculosis and Chest Service, Centre for Health Protection, Hong Kong, China.
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Abstract
BACKGROUND Our team previously demonstrated arterial stiffening and cardiac hypertrophy in type 2 diabetic rats at 8 but not 4 weeks after being administered streptozotocin (STZ) and nicotinamide (NA). The present study focused on investigating the effects of type 2 diabetes on cardiac autonomic nerve function in the STZ- and NA-treated animals, using modern spectral estimation technique. DESIGN An autoregressive process was performed to each detrended signal of heart rate and systolic blood pressure measured in the 4- and 8-week STZ-NA rats with anaesthesia. The power of low-frequency and high-frequency oscillations was automatically quantified with each spectral peak by computing the residuals. The closed-loop baroreflex gain was estimated using the square root of the ratio between heart rate and systolic blood pressure powers in the low-frequency band. RESULTS Compared with the age-matched controls, both the 4- and 8-week STZ-NA diabetic rats had significantly decreased low-frequency oscillations of heart rate but not systolic blood pressure variability, showing a decline in baroreflex gain (0.451 +/- 0.060 and 0.484 +/- 0.056 vs. 1.196 +/- 0.064 ms mmHg(-1), P < 0.05). On the other hand, the low frequency-high frequency power ratio of the heart period was also diminished in the two diabetic groups, indicating a shift in sympatho-vagal balance of the heart control (0.472 +/- 0.109 and 0.504 +/- 0.090 vs. 1.857 +/- 0.336, P < 0.05). CONCLUSIONS The cardiac autonomic dysfunction in the absence of any significant changes in vascular dynamics, 4 but not 8 weeks after induction of type 2 diabetes, suggests that the diabetic autonomic neuropathy may precede arterial stiffening and cardiac hypertrophy in the STZ- and NA-treated rats.
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Affiliation(s)
- Y-D Lin
- Department of Automatic Control Engineering, Feng-Chia University, Taichung, Taiwan
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Abstract
Sputum culture is essential for monitoring drug resistance. Although sputum induction may optimise culture yield, better selection criteria and simpler algorithms are needed for countries with intermediate tuberculosis burdens. From a cohort of 660 patients who registered for antituberculosis treatment in a government chest clinic from May 21, 2005 to February 28, 2007, 187 patients with pulmonary disease and a negative smear in two unsupervised sputum specimens were enrolled prospectively for collection of one specimen each of supervised and induced sputum in succession. Among enrolled patients, induced sputum significantly improved ease of expectoration on a subjective five-point scale. Among 78 patients with culture-proven pulmonary tuberculosis, analysis of matched sputum culture results showed that: 1) induced sputum outperformed supervised sputum; 2) the second unsupervised sputum was significantly inferior to the first and redundant in the presence of the others; 3) adding one specimen each of supervised and induced sputum to two unsupervised specimens increased culture yield significantly; and 4) patients with either extent of disease less than right upper lobe or no respiratory symptoms were more likely to benefit. In summary, it may be practical to collect a sample of unsupervised, supervised and induced sputum for smear-negative patients with extent of disease less than the right upper lobe, especially when respiratory symptoms are absent.
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Affiliation(s)
- K C Chang
- Tuberculosis and Chest Service, Centre for Health Protection, Departrment of Health, Hong Kong, China.
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Wu MS, Liang JT, Lin YD, Wu ET, Tseng YZ, Chang KC. Aminoguanidine prevents the impairment of cardiac pumping mechanics in rats with streptozotocin and nicotinamide-induced type 2 diabetes. Br J Pharmacol 2008; 154:758-64. [PMID: 18376420 DOI: 10.1038/bjp.2008.119] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND AND PURPOSE Aminoguanidine (AG), an inhibitor of advanced glycation endproducts, has been shown to prevent arterial stiffening and cardiac hypertrophy in streptozotocin (STZ) and nicotinamide (NA)-induced type 2 diabetes in rats. Our aims were to examine whether AG produced benefits on cardiac pumping mechanics in the STZ and NA-treated animals in terms of maximal systolic elastance (E(max)) and theoretical maximum flow (Q(max)). EXPERIMENTAL APPROACH After induction of type 2 diabetes, rats received daily injections of AG (50 mg kg(-1), i.p.) for 8 weeks and were compared with age-matched, untreated, diabetic controls. Left ventricular (LV) pressure and ascending aortic flow signals were recorded to calculate E(max) and Q(max), using the elastance-resistance model. Physically, E(max) reflects the contractility of the myocardium as an intact heart, whereas Q(max) has an inverse relationship with the LV internal resistance. KEY RESULTS Both type 2 diabetes and AG affected E(max) and Q(max), and there was an interaction between diabetes and AG for these two variables. The E(max) and Q(max) were reduced in rats with type 2 diabetes, but showed a significant rise after administration of AG to these diabetic rats. Moreover, the increase in Q(max) corresponded to a decrease in total peripheral resistance of the systemic circulation when the STZ and NA-induced diabetic rats were treated with AG. CONCLUSIONS AND IMPLICATIONS AG therapy prevented not only the contractile dysfunction of the heart, but also the augmentation in LV internal resistance in rats with STZ and NA-induced type 2 diabetes.
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Affiliation(s)
- M-S Wu
- Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
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Chang KC, Wu MH, Jones D, Chen FF, Tseng YL. Activation of STAT3 in thymic epithelial tumours correlates with tumour type and clinical behaviour. J Pathol 2007; 210:224-33. [PMID: 16917804 DOI: 10.1002/path.2041] [Citation(s) in RCA: 22] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The STAT3 (signal transducers and activators of transcription 3) signalling pathway plays a pivotal role in oncogenesis and appears essential for postnatal maintenance of thymic architecture and thymocyte survival. The association of STAT3 activation with thymic epithelial tumours (TETs) and myasthenia gravis (MG) has not been elucidated. In this study, 118 cases of TET and 25 non-neoplastic thymic tissue samples were evaluated for STAT3 and phospho-STAT3 (pSTAT3) expression immunohistochemically. In addition, 44 normal thymuses of different ages were included for comparison. It was found that STAT3 activation in thymic epithelial cells (TECs), as evidenced by pSTAT3 expression and/or nuclear STAT3, was present in the majority of non-neoplastic thymuses (88%, 22/25), including those from young children, but not in fetal thymus. In thymoma (n = 73), activated STAT3 was noted at a significantly higher frequency in the cases of lymphocyte-rich thymoma (ie types AB, B1, and B2, 46%, 23/50) in comparison with lymphocyte-depleted thymoma (types A and B3, 1/23) (p = 0.009). Thymoma with activated STAT3 tended to present at an earlier stage, show complete resectability and less aggressive behaviour, and have a higher correlation with MG than the STAT3-negative/inactive group (p < 0.05). In contrast, thymic carcinoma with activated STAT3 (14/45, 31%) had significantly higher rates of unresectability, vascular invasion, and regional lymph node metastasis (p < 0.05). These data provide the first evidence that constitutive STAT3 activation is seen in both benign and neoplastic thymic tissue and is associated with the persistence of thymic tissue and the presence of MG. It is likely to be induced by different factors in thymoma and thymic carcinoma.
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Affiliation(s)
- K-C Chang
- Department of Pathology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
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Chuang SS, Chang ST, Lee YH, Chang KC. Prostatic involvement by nasal NK/T cell lymphoma forming lymphoepithelial lesions. J Clin Pathol 2007; 61:399-400. [DOI: 10.1136/jcp.2007.053538] [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: 11/03/2022]
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Wimmers K, Murani E, Te Pas MFW, Chang KC, Davoli R, Merks JWM, Henne H, Muraniova M, da Costa N, Harlizius B, Schellander K, Böll I, Braglia S, de Wit AAC, Cagnazzo M, Fontanesi L, Prins D, Ponsuksili S. Associations of functional candidate genes derived from gene-expression profiles of prenatal porcine muscle tissue with meat quality and muscle deposition. Anim Genet 2007; 38:474-84. [PMID: 17697135 DOI: 10.1111/j.1365-2052.2007.01639.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Ten genes (ANK1, bR10D1, CA3, EPOR, HMGA2, MYPN, NME1, PDGFRA, ERC1, TTN), whose candidacy for meat-quality and carcass traits arises from their differential expression in prenatal muscle development, were examined for association in 1700 performance-tested fattening pigs of commercial purebred and crossbred herds of Duroc, Pietrain, Pietrain x (Landrace x Large White), Duroc x (Landrace x Large White) as well as in an experimental F(2) population based on a reciprocal cross of Duroc and Pietrain. Comparative sequencing revealed polymorphic sites segregating across commercial breeds. Genetic mapping results corresponded to pre-existing assignments to porcine chromosomes or current human-porcine comparative maps. Nine of these genes showed association with meat-quality and carcass traits at a nominal P-value of < or = 0.05; PDGFRA revealed no association reaching the P < or = 0.05 threshold. In particular, HMGA2, CA3, EPOR, NME1 and TTN were associated with meat colour, pH and conductivity of loin 24 h postmortem; CA3 and MYPN exhibited association with ham weight and lean content (FOM) respectively at P-values of < 0.003 that correspond to false discovery rates of < 0.05. However, none of the genes showed significant associations for a particular trait across all populations. The study revealed statistical-genetic evidence for association of the functional candidate genes with traits related to meat quality and muscle deposition. The polymorphisms detected are not likely causal, but markers were identified that are in linkage disequilibrium with causal genetic variation within particular populations.
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Affiliation(s)
- K Wimmers
- Research Institute for the Biology of Farm Animals (FBN), Wilhelm-Stahl-Allee 2, 18196 Dummerstorf, Germany.
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Chang KC, Liang JT, Tseng CD, Wu ET, Hsu KL, Wu MS, Lin YT, Tseng YZ. Aminoguanidine prevents fructose-induced deterioration in left ventricular-arterial coupling in Wistar rats. Br J Pharmacol 2007; 151:341-6. [PMID: 17401443 PMCID: PMC2013974 DOI: 10.1038/sj.bjp.0707223] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND AND PURPOSE Aminoguanidine (AG), an inhibitor of advanced glycation endproducts, has been identified as a prominent agent that prevents the fructose-induced arterial stiffening in male Wistar rats. Our aims were to examine whether AG produced benefits on the left ventricular (LV)-arterial coupling in fructose-fed (FF) animals in terms of the ventricular and arterial chamber properties. EXPERIMENTAL APPROACH Rats given 10% fructose in drinking water (FF) were daily treated with AG (50 mg x kg(-1), i.p.) for 2 weeks and compared with the untreated FF group. In anaesthetised rats, LV pressure and ascending aortic flow signals were recorded to calculate LV end-systolic elastance (E(es), an indicator of myocardial contractility) and effective arterial volume elastance (E(a)). The optimal afterload (Q(load)) determined by the ratio of E(a) to E(es) was used to measure the coupling efficiency between the left ventricle and its vasculature. KEY RESULTS There was a significant interaction between fructose and AG in their effects on E(a). Fructose loading significantly elevated E(a) and AG prevented the fructose-derived deterioration in arterial chamber elastance. Both fructose and AG affected E(es) and Q(load), and there was an interaction between fructose and AG for these two variables. Both E(es) and Q(load) exhibited a decline with fructose feeding but showed a significant rise after AG treatment in the FF rats. CONCLUSIONS AND IMPLICATIONS AG prevented not only the contractile dysfunction of the heart caused by fructose loading, but also the fructose-induced deterioration in matching left ventricular function to the arterial system.
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Affiliation(s)
- K-C Chang
- Department of Physiology, College of Medicine, National Taiwan University, Taipei, Taiwan.
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Abstract
A nested case-control study was conducted in order to examine whether dosing schedules of standard pyrazinamide-containing anti-tuberculosis (TB) treatment (standard treatment) might affect hepatotoxicity. The present authors retrospectively identified all patients with hepatitis using biochemical criteria from a cohort of 3,007 clinic patients who commenced anti-TB treatment from January 1 to June 30, 2001. Each case with hepatitis between 1-9 weeks post-TB treatment was compared using conditional logistic regression analysis with two controls selected randomly from patients without hepatitis in the same period and matched by sex, age and standard treatment. Impacts of sex and age were examined by logistic regression analysis of cases and patients without hepatitis. Hepatitis occurred in 167 patients, of whom 96 qualified as cases. A conditional logistic risk model identified hepatitis B surface antigen carriage as the only risk factor (odds ratio (95% confidence interval (CI)) 1.8 (1.1-3.1)). Logistic regression analysis showed that sex was nonsignificant but ageing increased the odds of hepatitis. The risk of hepatitis increased from 2.6% (1.9-3.5%) to 4.1% (3.2-5.3%) as age exceeded 49 yrs. Dosing schedules in the first 9 weeks have little impact on hepatotoxicity. If patients at risk of both hepatitis and relapse receive standard treatment, daily dosing is preferable.
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Affiliation(s)
- K C Chang
- Tuberculosis and Chest Service, Centre for Health Protection, Department of Health, Hong Kong, China.
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Abstract
BACKGROUND Formation of advanced glycation end-products (AGEs) on collagen within the arterial wall may be responsible for the development of diabetic vascular injury. This study focused on investigating the role of aminoguanidine (AG), an inhibitor of AGE formation, in the prevention of noninsulin-dependent diabetes mellitus (NIDDM)-derived arterial stiffening and cardiac hypertrophy in rats. MATERIALS AND METHODS The NIDDM was induced in male Wistar rats, which were administered intraperitoneally with 180 mg kg(-1) nicotinamide (NA) 30 min before an intravenous injection of 50 mg kg(-1) streptozotocin (STZ). After induction of diabetes mellitus type 2, animals receiving daily peritoneal injections with 50 mg kg(-1) AG for 8 weeks were compared with the age-matched, untreated, diabetic controls. RESULTS After exposure to AG, the STZ-NA diabetic rats had improved aortic distensibility, as evidenced by 18.8% reduction of aortic characteristic impedance (P < 0.05). Treatment of the experimental syndrome with AG also resulted in a significant increase in wave transit time (+23.7%, P < 0.05) and a decrease in wave reflection factor (-26.6%, P < 0.05), suggesting that AG may prevent the NIDDM-induced augmentation in systolic load of the left ventricle. Also, the glycation-derived modification on aortic collagen was found to be retarded by AG. The diminished ratio of left ventricular weight to body weight suggested that prevention of the diabetes-related cardiac hypertrophy by AG may correspond to the drug-induced decline in aortic stiffening. CONCLUSIONS Long-term administration of AG to the STZ-NA diabetic rats imparts significant protection against the NIDDM-derived impairment in vascular dynamics, at least partly through inhibition of the AGE accumulation on collagen in the arterial wall.
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Affiliation(s)
- K-C Chang
- Department of Physiology, College of Medicine, National Taiwan University, Taipei, Taiwan.
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Lujan Feliu-Pascual A, Lujan Feliu-Pascual A, Shelton GD, Targett MP, Long SN, Comerford EJ, McMillan C, Davies D, Rusbridge C, Mellor D, Chang KC, Anderson TJ. Inherited myopathy of great Danes. J Small Anim Pract 2006; 47:249-54. [PMID: 16674719 DOI: 10.1111/j.1748-5827.2006.00073.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [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
A hereditary, non-inflammatory myopathy occurring in young great Danes with distinctive histological features in muscle biopsy specimens is reviewed. Onset of clinical signs is usually before one year of age and both sexes are affected. Clinical signs are characterised by exercise intolerance, muscle wasting, and an exercise-induced tremor. Although most affected dogs have a severe form of the disease, occasional dogs may have a less pronounced form and survive into adulthood with an acceptable quality of life. Litters containing affected puppies are born to clinically unaffected parents, and an autosomal recessive pattern of inheritance is likely. All recorded cases have had fawn or brindle coat coloration. Elevated serum creatinine kinase concentrations and spontaneous electrical activity in skeletal muscles are frequently found. While originally reported (Targett and others 1994) as a central core myopathy in this breed, the histochemical characteristics of the distinct cytoarchitectural structures differ from those of the well-characterised central core myopathy in human beings. In fact, these structures differ from any known myopathy in human beings and likely represents a unique non-inflammatory myopathy affecting dogs. Until this myopathy is characterised further, the name inherited myopathy in great Danes is suggested.
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Affiliation(s)
- A Lujan Feliu-Pascual
- Comparative Neuromuscular Laboratory, University of California-San Diego, La Jolla, CA 92093-0709, USA
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Chang KC, Leung CC, Tam CM. Per lesion analysis is misleading. Thorax 2006; 61:364. [PMID: 16565272 PMCID: PMC2104597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
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Salehi MM, Levy PS, Jamalzadeh MA, Chang KC. Adaptation of multiple logistic regression to a multiple inverse sampling design: application to the Isfahan healthy heart program. Stat Med 2006; 25:71-85. [PMID: 16217852 DOI: 10.1002/sim.2288] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In observational and experimental studies in the health sciences involving human populations, it is sometimes considered desirable to recruit subjects according to designs that specify a predetermined number of subjects in each of several mutually exclusive classes (generally but not necessarily demographic in nature). This type of adaptive sampling design, now generally referred to as multiple inverse sampling (MIS), has received recent attention, and estimation methods are now available for several sequential MIS sampling designs. In this class of designs, subjects are sampled randomly and sequentially, usually one at a time, until all classes have the pre-specified number of subjects. In this paper, we extend MIS for finite population sampling to estimation of the parameters in multiple logistic regression under MIS. Using estimated logistic regression parameters and cost components obtained from the Isfahan Healthy Heart Program (IHHP), we report findings from a simulation experiment in which it appears that, at fixed cost, MIS at the last stage of sampling compares favourably to simple random sampling. The IHHP is a large community intervention study for prevention of cardiovascular disease being conducted in Isfahan, Iran and two other cities in Iran. The IHHP identified subjects through a multistage sample survey in which MIS was used at the final stage of sampling. MIS is one of several methods of adaptive sampling that are generating considerable interest and show promise of being useful in a wide variety of applications.
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Affiliation(s)
- M Mohammad Salehi
- School of Mathematical Sciences, Isfahan University of Technology, Isfahan 84156, Iran
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