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Shi YW, Wang Y, Cao TY, Xu JH, Cui D, Wang XH, Zhu YP, Ruan Y, Han BM, Xia SJ, Jing YF. [Comparison of efficacy and safety of transurethral thulium laser vapoenucleation of prostate and transurethral thulium laser enucleation of prostate in the treatment of benign prostatic hyperplasia]. Zhonghua Yi Xue Za Zhi 2023; 103:2297-2301. [PMID: 37574825 DOI: 10.3760/cma.j.cn112137-20221203-02563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Objective: To compare early outcomes between transurethral thulium laser vapoenucleation of prostate and transurethral thulium laser enucleation of prostate for the treatment of benign prostatic hyperplasia (BPH). Methods: Retrospective analysis was conducted on the clinical data of 1 638 BPH patients admitted to the Department of Urology of Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine from January 2018 to December 2021. There were 916 patients underwent transurethral thulium laser vapoenucleation of prostate (ThuVEP group) and 722 patients underwent transurethral thulium laser enucleation of prostate (ThuLEP group). The operation time, eliminated tissue weight, surgical complications, duration of post-operative catheter implantation were compared between the two groups. The improvement of International Prostate Symptom Score (IPSS), Quality of Life Index (QoL), maximum uroflow rate (Qmax) and post-void residual urine volume (PVR) at 1 month after operation was compared between the two groups. Results: There were no significant differences in age, preoperative and 1-month postoperative prostate volume, IPSS score, QoL score, Qmax, and PVR between the ThuVEP and ThuLEP group (all P>0.05). There were no significant differences in perioperative indicators such as operation time, cutting or enucleation time, tissue crushing time, tissue weight, hemoglobin change, catheter indwelling time, and postoperative hospital stay between ThuVEP group and ThuLEP group (all P>0.05). The incidence of minor gross hematuria after extubation in the ThuVEP group was 7.8% (56/916), which was lower than 9.4% (65/722) in the ThuLEP group (P=0.026); the incidence of temporary incontinence at 1 month after surgery was 5.2% (38/916) in ThuVEP group, lower than 11.9% (86/722) in ThuLEP group (P<0.001). A total of 3 patients (0.4%) in ThuLEP group required operative intervention for severe post-operation bleeding, but none of ThuVEP group suffered from this kind of surgical complications. Conclusions: ThuVEP has similar efficacy with ThuLEP for the treatment of BPH. ThuVEP can significantly reduce the incidence of post-operation temporary urine incontinence, and has much superiority in stanching bleeding.
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Affiliation(s)
- Y W Shi
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - Y Wang
- Department of Urology, Shanghai General Hospital Jiading Branch, Shanghai Jiao Tong University School of Medicine, Shanghai 201800, China
| | - T Y Cao
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - J H Xu
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - D Cui
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - X H Wang
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - Y P Zhu
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - Y Ruan
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - B M Han
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - S J Xia
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
| | - Y F Jing
- Department of Urology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China
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Shi YW, Qin XJ, Zeng C, Zhang XR. [Effects of typical PKC subtypes on the proliferation of mouse pulmonary artery smooth muscle cells and the expression of ERK1/2 and Akt induced by hypoxia]. Zhonghua Jie He He Hu Xi Za Zhi 2022; 45:460-467. [PMID: 35527461 DOI: 10.3760/cma.j.cn112147-20211022-00730] [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: 06/14/2023]
Abstract
Objective: To study the effects of specific isoforms of classic protein kinase C (cPKCs) on hypoxia-induced proliferation and the expression of ERK1/2 and Akt using drug intervention or virus transfection in vitro. Methods: Dynal MPC-1 magnetic particle concentrator was used to separate iron-containing pulmonary arterioles fragments, and the pulmonary artery smooth muscle cells (PASMCs) were primary cultured and identified. The cells were intervened by PKC agonist (PMA), PKCα inhibitor (safingol), PKCβⅠ inhibitor (Go6976) and PKCβⅡ inhibitor (LY333531) respectively, and the changes in protein expressions of cPKCs, and the phosphorylation levels of ERK1/2 and Akt were observed by immunoblotting under the condition of normal oxygen or hypoxia. The lentiviral vectors of PKCα and PKCβ were used to specifically knock-down the activity of target genes by virus transfection techniques, and Western blotting was used to observe the protein expressions of cPKCs, and the phosphorylation levels of ERK1/2 and Akt in hypoxia-induced PASMCs in mice. Results: With Brdu method, the proliferation of PASMCs induced by hypoxia was significantly inhibited by safingol, Go6976 and LY333531 by inhibiting cPKCα, βⅠ and βⅡ respectively. Compared with the hypoxic control group, the rates of Brdu positive cells were (7.35±0.26)% vs (11.28±0.43)%, (3.76±0.25)% vs (7.98±0.28)% and (4.12±0.46)% vs (7.78±0.53)%. We also observed that PMA could significantly promote the proliferation of PASMCs under normoxic condition. Compared with the normoxia control group, the Brdu-positive cell rates were (9.65±0.47)% vs (6.34±0.52)%, (9.34±0.38)% vs (5.42±0.21)% and (7.78±0.53)% vs (4.12±0.46)%. In addition, after transfection with PKCα or PKCβ lentiviral vector, the proliferation of PASMCs was significantly lower in hypoxia transfection group than in the control group. The rates of Brdu positive cells were (3.58±0.54)% vs (5.97±0.63)%, respectively. Using Western blotting, we also observed that after being inhibited by safingol, Go6976 and LY333531 respectively, the phosphorylation levels of ERK1/2 and Akt in PASMCs induced by hypoxia was significantly lower than the control group. After using safingol, the phosphorylation levels of ERK1/2 and Akt were (0.56±0.07) vs (1.08±0.13) and (0.49±0.04) vs (0.97±0.08). After using Go6976, the phosphorylation levels of ERK1/2 and Akt were (0.41±0.09) vs (0.79±0.10) and (0.48±0.09) vs (0.82±0.16), after using LY333531, the phosphorylation levels of ERK1/2 and Akt were (0.42±0.03) vs (0.87±0.06) and (0.34±0.07) vs (0.78±0.05). While PMA could promote the phosphorylation levels of ERK1/2 and Akt under normoxic condition, 1.25±0.12 vs 0.41±0.07 and 0.98±0.06 vs 0.37±0.08, respectively. Using transfection technique to specifically knock down the expression of cPKCα and β, we found that under hypoxic conditions, transfection of PASMCs could significantly lower the phosphorylation levels of ERK1/2, its phosphorylation level was 0.29±0.06 vs 0.76±0.05, with no evident change in the phosphorylation levels of Akt. Conclusions: Hypoxia may lead to phosphorylation of ERK1/2 by promoting the protein expression of cPKCα, cPKCβⅠ and cPKCβⅡ respectively, which eventually induces abnormal proliferation of PASMCs from the distal pulmonary arteries, participating in the development of hypoxic pulmonary hypertension (HPH) of the mice. Regulation of the expression of cPKCα, cPKCβⅠ and cPKCβⅡ may help to attenuate the formation of pulmonary vascular remodeling. Target therapy based on cPKCs is expected to be a new direction for HPH therapy in the future.
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Affiliation(s)
- Y W Shi
- Department of Respiratory and Critical Care Medicine, Shanxi Medical University Affiliated First Hospital, Taiyuan 030012, China
| | - X J Qin
- School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - C Zeng
- Department of Pediatrics, Shanxi Medical University, Taiyuan 030001, China
| | - X R Zhang
- Department of Respiratory and Critical Care Medicine, Shanxi Medical University Affiliated First Hospital, Taiyuan 030012, China
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Li X, Li J, Shi YW, Wu GD, Wang MX, Chen Y, Dong CM. [A case report of Streptococcus suis meningoencephalitis diagnosed by metagenomic next-generation sequencing of cerebrospinal fluid and blood]. Zhonghua Nei Ke Za Zhi 2021; 60:1176-1179. [PMID: 34856692 DOI: 10.3760/cma.j.cn112138-20210113-00034] [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] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Affiliation(s)
- X Li
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou 730000, China
| | - J Li
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou 730000, China
| | - Y W Shi
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou 730000, China
| | - G D Wu
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou 730000, China
| | - M X Wang
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou 730000, China
| | - Y Chen
- Intensive Care Unit, Lanzhou University Second Hospital, Lanzhou 730000, China
| | - C M Dong
- Intensive Care Unit, Lanzhou University Second Hospital, Lanzhou 730000, China
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Fang Y, Zhu XJ, Wang LQ, Shi YW, Zhou WC, Wu ZF, Qiu CY, Mao ZF, Ni JZ, Chen M, Ao T, Yang B, Yang YF, Sun YG, Cheng L. [Minutes of the 2020 China Rhinology Annual Meeting]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2021; 56:548-552. [PMID: 34011018 DOI: 10.3760/cma.j.cn115330-20210224-00085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Y Fang
- Editorial Office of Chinese Journal of Otorhinolaryngology Head and Neck Surgery, Chinese Medical Association, Beijing 100710, China
| | - X J Zhu
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - L Q Wang
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - Y W Shi
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - W C Zhou
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - Z F Wu
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - C Y Qiu
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - Z F Mao
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - J Z Ni
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - M Chen
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - T Ao
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - B Yang
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - Y F Yang
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - Y G Sun
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - L Cheng
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China International Centre for Allergy Research, Nanjing Medical University, and Clinical Allergy Center, Jiangsu Province Hospital, Nanjing 210029, China
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Shi YW, Xiao QQ, Fan JG. [Introduction to the APASL clinical guidelines on the management of metabolic-associated fatty liver disease]. Zhonghua Gan Zang Bing Za Zhi 2020; 28:915-917. [PMID: 33256275 DOI: 10.3760/cma.j.cn51113-20201102-00592] [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] [Indexed: 11/05/2022]
Abstract
Recently, metabolic-associated fatty liver disease has become the world's highest prevalence of chronic liver disease. Moreover, it is closely related to metabolic syndrome and related diseases, bringing a huge disease burden. Previously, the global expert consensus on renaming for non-alcoholic fatty liver disease and the diagnostic criteria for metabolic-associated fatty liver disease has increased the certainty of further clinical research and practice. Presently, the research on metabolic-associated fatty liver disease is progressing rapidly, and the opinions and data based on clinical evidence are constantly updated. Hepatology international has published the "Asian Pacific Association for the Study of liver diseases' clinical guidelines on the management of metabolic-associated fatty liver disease" , which aims to promote clinical practice and improve the efficiency of clinical research. Here, we have translated the published recommendations into Chinese language, hoping to help most health professionals make clinical decisions.
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Affiliation(s)
- Y W Shi
- Department of Gastroenterology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University, School of Medicine, Shanghai Key Lab of Pediatric Gastroenterology and Nutrition, Shanghai 200092,China
| | - Q Q Xiao
- Department of Gastroenterology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University, School of Medicine, Shanghai Key Lab of Pediatric Gastroenterology and Nutrition, Shanghai 200092,China
| | - J G Fan
- Department of Gastroenterology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University, School of Medicine, Shanghai Key Lab of Pediatric Gastroenterology and Nutrition, Shanghai 200092,China
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Song HF, Deng X, Yang N, Hao B, Hu YB, Shi YW, Xue L, Zhao H. Impulse Control and ERP Characteristics of Patients with Mental Disorder Caused by Traumatic Brain Injury. Fa Yi Xue Za Zhi 2020; 36:326-332. [PMID: 32705844 DOI: 10.12116/j.issn.1004-5619.2020.03.006] [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: 11/12/2019] [Indexed: 11/30/2022]
Abstract
Abstract Objective To explore the impulse control and event-related potential (ERP) characteristics of patients with mental disorders caused by traumatic brain injury (TBI) in forensic psychiatry identification and to provide objective auxiliary indicators for forensic psychiatry identification. Methods Thirty patients (TBI group) with mental disorders caused by traumatic brain injury, who were identified as mild psychiatric impairment by judicial psychiatry, including 24 males and 6 females, as well as the thirty people in the control group participated in the study. All the participants completed Barratt Impulsiveness Scale-11 (BIS-11) and ERP induced by Go/NoGo tasks. BIS-11 and ERP data were collected and analyzed. Results The results of the BIS-11 showed that the total score and subscale scores of the TBI group were higher compared to the control group (P<0.05). Moreover, the TBI group exhibited significantly lower NoGo-N2 amplitude and lower NoGo-P3 amplitude than the control group. The NoGo-N2 amplitude was larger than the Go-N2 amplitude, and the NoGo-P3 amplitude was larger than the Go-P3 amplitude in both groups (P<0.05). Conclusion Traumatic brain injury could impair impulse control of mild psychiatric impairment patients, and the amplitudes of NoGo-N2 and NoGo-P3 could be important parameters to evaluate the impulse control of patients with mental disorders caused by traumatic brain injury.
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Affiliation(s)
- H F Song
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China
| | - X Deng
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China
| | - N Yang
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China
| | - B Hao
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China
| | - Y B Hu
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China
| | - Y W Shi
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China.,Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Guangzhou 510080, China
| | - L Xue
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China.,Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Guangzhou 510080, China
| | - H Zhao
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China.,Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Guangzhou 510080, China
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Zhou JL, Wang BQ, Shi YW, You H. [Effect of chronic hepatitis B virus DNA negative transformation and HBsAg clearance on the occurrence of hepatocellular carcinoma]. Zhonghua Gan Zang Bing Za Zhi 2020; 27:831-833. [PMID: 31941236 DOI: 10.3760/cma.j.issn.1007-3418.2019.11.004] [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] [Indexed: 11/05/2022]
Abstract
Achieving HBV DNA negative transformation and HBsAg clearance with effective antiviral therapy can reduce the incidence of HCC, but some patients are still at risk of developing HCC. Therefore, screening high-risk patients for close monitoring is essential to reduce the incidence of HCC. This paper reviews the occurrence of HCC, risk factors and risk prediction models of HBV DNA negative transformation and HBsAg clearance, and provides a basis for screening and follow-up management of high-risk group of HCC with chronic hepatitis B.
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Affiliation(s)
- J L Zhou
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
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Shi YW, Ma H. [Risk factors and therapeutic strategies for primary biliary cholangitis patients with poor prognosis]. Zhonghua Gan Zang Bing Za Zhi 2017; 25:870-873. [PMID: 29325284 DOI: 10.3760/cma.j.issn.1007-3418.2017.11.014] [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] [Indexed: 11/05/2022]
Abstract
With the progress in detection methods and the update of diagnostic and therapeutic concepts, more and more patients with primary biliary cholangitis (PBC) have been diagnosed and treated. A high proportion of PBC patients, however, progress to liver decompensation, with an increased risk of liver transplantation and death and a significant reduction in long-term survival. These patients need early diagnosis and urgent treatment. This article discusses how to identify the PBC patients with poor prognosis early from the aspects of biochemical response, disease features, and biomarkers, and reviews the progress in related complementary therapies and new drugs including Ocaliva, Fibrates, UDCA-derived drugs, and molecular targeted drugs.
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Affiliation(s)
- Y W Shi
- Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing Key Laboratory of Translational Medicine on Liver Cirrhosis, National Clinical Research Center for Digestive Diseases, Beijing 100050, China
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Zhang LJ, Guo CY, Xu HH, Xu D, Shen XB, Du XY, Zhang MH, Tan JG, Zhang JH, Dong CY, Qian HL, Shi YW, Pan MZ, Zhou XD. [Acute effect of ambient air pollution on small airway lung functions among school children in Shanghai]. Zhonghua Liu Xing Bing Xue Za Zhi 2017; 38:147-153. [PMID: 28231656 DOI: 10.3760/cma.j.issn.0254-6450.2017.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Objective: To study the acute effects of compound ambient air pollution on small airway lung functions among school children in Shanghai. Method: A longitudinal survey on lung functions was conducted among 233 school-children from three schools (A, B and C, located in innerring, mid-ring and outer-ring areas). Lung function test was performed once a week for 3 times respectively, among children in school A and B in Dec. 2013 and in school C in Dec. 2014. The fourth lung function test was tested in Jun. 2014 and May 2015 in the respective schools. Results: from the lung function would include items as: forced mid-expiratory flow at 25% of forced vital capacity (MEF(25%)), mid-expiratory flow at 50% of forced vital capacity (MEF(50%)), mid-expiratory flow at 75% of forced vital capacity (MEF(75%)) and mid-expiratory flow between 25% and 75% of the forced vital capacity (FEF(25%-75%)). Data regarding the daily air quality real-time of PM(2.5), PM(10), SO(2) and NO(2) in Dec. 2013, Dec. 2014, Jun. 2014 and May. 2015 from the three environmental monitoring spots and meteorological data from the Shanghai Meteorological Service system which were physically close to the three schools, were collected simultaneously. Linear mixed effect model was used to examine the levels of correlation between lung function indicators and ambient air pollutants. Results When confounding factors on meteorology and individuals were controlled, the lag effects and accumulated lag effects were found to have existed between the internal quarter rang (IQR) concentration of PM(2.5) and PM(10) in lag2 day and lag02 days, IQR concentration of SO(2) in lag02 day and IQR concentration of NO(2) lag0 day, when small airway lung functions like MEF(25%), MEF(50%), MEF(75%) and FEF(25%-75%)(P<0.05) were inspected. Results from the two air pollutants model analysis showed that SO(2) and NO(2) presenting interactive effects with PM(2.5), PM(10) and lag effects more significant than the individual SO(2) and NO(2), respectively (P<0.05). Conclusion: Contents on the ambient air pollutants as PM(2.5), PM(10), SO(2) and NO(2) were negatively associated with the lung functions in the small airways of children, in Shanghai.
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Affiliation(s)
- L J Zhang
- Environmental Health Department, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - C Y Guo
- General Office, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - H H Xu
- Environmental Health Department, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - D Xu
- Environmental and Occupational Health Department, Shanghai Xuhui Centre for Disease Control and Prevention, Shanghai 200237, China
| | - X B Shen
- Environmental Health Department, Shanghai Baoshan Centre for Disease Control and Prevention, Shanghai 201901, China
| | - X Y Du
- Environmental Health Department, Shanghai Huangpu Centre for Disease Control and Prevention, Shanghai 200023, China
| | - M H Zhang
- Division of Public Health Service and Safety Assessment, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - J G Tan
- Shanghai Key Laboratory of Meteorology and Health, Shanghai Meteorological Service, Shanghai 200030, China
| | - J H Zhang
- Environmental Health Department, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - C Y Dong
- Environmental Health Department, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - H L Qian
- Environmental Health Department, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - Y W Shi
- Environmental Health Department, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - M Z Pan
- Environmental Health Department, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
| | - X D Zhou
- Environmental Health Department, Shanghai Municipal Center for Disease Control and Prevention/Shanghai Institute for Prevention Medicine, Shanghai 200336, China
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Abstract
Flexible hollow-glass fibers with small-bore diameters of 250 and 320 mum have been developed for Er:YAG laser delivery. The fibers consist of a glass capillary tube and an inner coating of silver and polymer thin films that are deposited by use of a simple liquid-phase technique. The 250-mum-bore fiber exhibits a straight loss of 0.8 dB/m and a bending loss of 1.2 dB when it is bent 180 degrees at the output end, with a bending radius of 2 cm. The maximum energy delivered by the fibers is ~100 mJ.
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Sato S, Ashida H, Arai T, Shi YW, Matsuura Y, Miyagi M. Vacuum-cored hollow waveguide for transmission of high-energy, nanosecond Nd:YAG laser pulses and its application to biological tissue ablation. Opt Lett 2000; 25:49-51. [PMID: 18059778 DOI: 10.1364/ol.25.000049] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A vacuum-cored hollow waveguide has been found to transmit 1064-nm, Q-switched Nd:YAG laser pulses. With this scheme, laser-induced air breakdown was completely suppressed, and the laser-induced damage threshold of the waveguide's inner coating was significantly increased. With a 1-m-long, 1-mm inner-diameter, cyclic olefin polymer-coated silver hollow waveguide, the maximum transmitted laser energy was as great as 158 mJ/pulse (20.1 J/cm(2)), at a repetition rate of 10 Hz in a 90 degrees -bent waveguide condition. The corresponding transmitted peak laser power was 17.6 MW. With the transmitted laser pulses, deep ablation of myocardium tissues was demonstrated in vitro.
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Jelínková H, Sulc J, Erný P, Shi YW, Matsuura Y, Miyagi M. High-power Nd:YAG laser picosecond pulse delivery by a polymer-coated silver hollow-glass waveguide. Opt Lett 1999; 24:957-959. [PMID: 18073908 DOI: 10.1364/ol.24.000957] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
An oscillator-amplifier high-power Nd:YAG laser system was used for transmission of a single 50-ps-long pulse or a train of pulses through a cyclic olefin polymer-coated silver hollow-glass waveguide. The maximum energy that was transmitted was 150 mJ for the train of pulses and 40 mJ for the single pulse, from which followed a delivered power of 100 GW/cm(2) . The characteristics that were obtained make these waveguides promising for the delivery of high-power laser pulses in medical as well as other applications.
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Shi YW, Wang Y, Abe Y, Matsuura Y, Miyagi M, Sato S, Taniwaki M, Uyama H. Cyclic olefin polymer-coated silver hollow glass waveguides for the infrared. Appl Opt 1998; 37:7758-7762. [PMID: 18301615 DOI: 10.1364/ao.37.007758] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Cyclic olefin polymer (COP) is newly used as the inner dielectric of infrared, hollow glass waveguides because of its low extinction coefficient in the mid-infrared region. A liquid-flow coating and dry-cure process are employed to form the COP layer on the inside of a silver-coated hollow glass tube. In the coating process, cyclohexane is chosen as the solvent of COP to form a smooth and uniform COP layer. It is shown that COP-coated silver hollow glass waveguides show low loss properties for CO(2), CO, and Er:YAG laser light when the thickness of the COP layer is properly chosen.
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Abstract
Hollow fibers for CO(2) laser light have been fabricated with a cyclic olefin polymer as the inner dielectric. A film of cyclic olefin polymer was coated inside the glass capillary tubing by a simple liquid-flowing process. A polymer-coated fiber with a 700-microm bore showed a loss of 0.06 dB/m for CO(2) laser light because cyclic olefin polymer has low absorption at a 10.6-microm wavelength.
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