1.Progress in application of magnesium alloys in the implanted medical devices
Zhongxiong FAN ; Lili ZHI ; Fuqiang GUO ; Zhenqing HOU
International Journal of Biomedical Engineering 2015;38(4):242-246
Magnesium alloys have been a hotspot in the field of implanted medical devices due to their biodegradable absorbability, excellent mechanical properties and good biocompatibility.The reduction in their rapid corrosion rates becomes the key to the application of implant medical device materials.In this paper, the latest research progress and the existing problems of magnesium alloys as the material for implantation of medical devices in the fracture internal fixation, bone tissue porous scaffold, and cardiovascular stent are reviewed.Improving corrosion resistant of magnesium alloys by means of alloying, improving purity, surface modification,rapid solidification, deformation processing, non crystallization and preparation of nano alloy technology in body fluid are expounded, and research direction and application prospect of magnesium alloys in the field of implanted medical devices are also expected.
2.Distribution and Antibacterial Resistance of Pathogens in Intensive Care Unit
Hua PENG ; Yingjuan SUN ; Hongmei WANG ; Zhenqing GUO
Chinese Journal of Nosocomiology 2005;0(11):-
OBJECTIVE To investigate the tendency of bacterial distribution and drug resistance of pathogens in ICU,then instruct clinical application of antibiotics reasonably.METHODS The identification of bacteria,isolated from patients in ICU from Jan 2005 to Dec 2006,and antibiotic susceptibility by ATB expression were used.RESULTS A total of 1197 pathogens strains were isolated,Gram-negative bacilli,Gram-postive cocci and fungi accounted for 64.2%,19.6% and 15.8%,respectively.The most common pathogens of them were Pseudomonas aeruginosa(22.1%).Except Escherichia coli(40%),the rate of the ESBL-producing strains of Serratia marcescens,Klebsiella pneumoniae,Acinetobacter baumannii and Enterobacter cloacae were higher than 70%.The most common pathogens of Gram-postive cocci were Staphylococcus.Meticillin-resistant strains of Staphylococcus aureus accounted for 93.8%.Mainly pathogenic bacteria were multi-resistant to some antibiotics.There were 189 strains fungi.And all the fungi were sensitive to amphotericin B,fluconazole and ketoconazole.CONCLUSIONS The infection and multi-drug resistance of pathogens are serious in ICU.It′s important and urgent to carry out surveillance of bacterial resistance for appropriately using antibiotics.
3.Air Quality in Cleaning Room of Supply Department:Influence of Hyperboric Water/Gas Blast Gun Working to Clean Endoscope
Hongmei WANG ; Zhenqing GUO ; Yingjuan SUN ; Hua PENG ; Tao SU
Chinese Journal of Nosocomiology 1994;0(04):-
OBJECTIVE To investigate the influence on air quality in cleaning room of the supply department when the water/gas blast gun is used to clean endoscope,to give basis for valuable protective procedures. METHODS Bacterial number of the air in the supply department was sampled using flat plate settling process pre-and post-operation. Simultaneously,the air purification effect of the laminar purification equipment was evaluated. RESULTS The air bacterial content before the water/gas blast gun ran was significantly different from that when the gun stopped (P
4.Monoclonal Antibody S2C4 Neutralizes The Toxicity of Shiga Toxin 2 and Its Variants
Yongjun JIAO ; Xiaoyan ZENG ; Xiling GUO ; Zhiyang SHI ; Zhenqing FENG ; Hua WANG
Progress in Biochemistry and Biophysics 2009;36(6):736-742
Shiga toxin 2 (Stx2) toxoid produced by formaldehyde treatment of purified toxin was used to immunize BALB/c mice for monoclonal antibody (MAb) production.The neutralizing activities of positive clones against Stx2 were screened by in vitro cytotoxicity assay.The isotype and specificity of resultant clone was determined,and its efficacy to neutralize the activity of purified Stx2 was evaluated by in vitro and in vivo toxicity model.Lastly,its spectrum of activity against Stx2 variants was also accessed by mouse toxicity model.It was demonstrated that one of the 12 positive MAb clones against Stx2,designating $2C4 had neutralizing activity.S2C4 belongs to the immunoglobulin G1 subclass and has a K light chain,and it reacts with the A subunit of Stx2 and does not bind to Stx2 B subunit or to Stx1.S2CA could efficiently neutralize the cytotoxicity of Stx2 to Veto cells and mice.It also protected mice against lethal doses of Stx2 variants challenge including Stx2c and Stx2vha.S2C4 is a promising candidate molecule in preventing the progression of hemolytic-uremic syndrome (HUS) mediated mainly by Stx2 in Stx-producing Escherichia coli(STEC)infection.
5.Analysis of the clinicopathological characteristics for 1 306 cases of thyroid cancer in Qingdao
Zhenqing GUO ; Teng ZHAO ; Mojian SUN ; Tao YANG ; Jiao LI ; Yansong LIN ; Jun LIANG
China Oncology 2016;(1):53-59
Background and purpose:The incidence of thyroid cancer (TC) is increasing worldwide. However, there were some differences among different regions. The purpose of this study was to investigate the incidence trends and clinicopathological characteristics of TC in Qingdao, a typical eastern coastal city, and to analyze the change in etiological spectrum of surgical thyroid diseases in recent years.Methods:A total of 2 251 patients who underwent thyroidectomy in 2014 due to thyroid nodules at the Affiliated Hospital of Qingdao University were retrospectively reviewed. The clinico-pathological characteristics were further analyzed among 1 306 patients with TC and compared with the corresponding data from the Surveillance Epidemiology and End Results (SEER) database as well as previous data from this hospital.Results:With the increasing number of thyroidectomy in Qingdao, there was also an increase in the proportion of TC in patients after thyroidectomy, from 34.8% in 2010 to 59.0% in 2014. Among those with TC, the male-to-female ratio was 1∶2.80, with a relatively high incidence among 20-54 year-old adults, who were younger than those reported in terms of distribution of age in SEER database (U=2 289,P=0.000). About 50.2% of the TC patients were overweight or obese, 78.2% TC patients had only asymptomatic nodules detected by ultrasound at initial diagnosis, while 16.6% had visible or palpable thyroid nodules. Only 5.2% presented hoarseness or other repression symptoms. Micro-carcinoma accounted for 61.7% of TC in 2014 at this hospital, which was significantly higher than the proportion in 2010 (37.7%). Lymph node involvement was significantly more frequent at this hospital than in SEER database (49.5%vs 26.0%,χ2=11.806,P=0.001). Even among patients with micro-carcinoma, 31.3% already presented lymph node metastases. The proportions of papillary, follicular, medullary and anaplastic carcinoma were 97.5%, 1.1%, 1.0% and 0.5%, respectively, among which the percentage of papillary carcinoma was higher than that in SEER database (U=4 654.5,P=0.055).Conclusion:There was an increase in the number of thyroidectomy in Qingdao, and the preoperative diagnostic accuracy of TC in this area kept rising. The in-cidence of TC was relatively high in a younger population, with more common lymph node involvements and an overweight trend. The increasing proportion of micro-carcinoma might be related to the popularization of health examination. However, the frequent lymph node metastasis in patients with micro-carcinoma is an important indicator of the invasive behavior of micro-carcinoma, which should not be overlooked.
6.Purification and functional characterization of enterohemorrhagic Escherichia coli O157: H7 Shiga toxinⅡ
Yongjun JIAO ; Xiaoyan ZENG ; Xiling GUO ; Hua WANG ; Lunbiao CUI ; Xian LI ; Zhenqing FENG ; Hui SUN ; Jiayi WAN ; Zhiyang SHI
Chinese Journal of Infectious Diseases 2008;26(4):217-220
Objective To purify Shiga toxin Ⅱ (STX Ⅱ) of enterohaemorrhagic Escherichia coli (EHEC) O157: H7 by affinity chromatography, and characterize its biological function. Methods The immno-affinity chromatography column was prepared by STX Ⅱ A subunit-specific antibody S1D8 coupling to Sepharose 4B matrix. The purity and specificity of STX Ⅱ molecule secreted by EHEC O157:H7 were detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blot, respectively. The purified toxin was serially diluted and the toxic activities to Vero cell line and mice were observed. The 50% cytotoxic dose (CD50) for Vero cell line and 100% lethal dose (LD100) for mice were calculated. The protection effect of anti-STX Ⅱ polysera to the mice against the purified toxin challenge was also observed. Results STX Ⅱ was successfully purified from culture supernatant of EHEC O157:H7 using affinity chromatography scheme. The relative molecular weights of STX Ⅱ A and B subunits were 32 000 and 7 500 confirmed by SDS-PAGE, respectively. The purified toxin could react with monoclonal antibodies against STX Ⅱ A and B subunits, respectively.The toxin was cytotoxic to Vero cell with CD50 of 20 ng/L and lethal to mice with LD100 of 5 ng.The toxin could be neutralized by anti-STX Ⅱ polysera in vivo. Conclusion STX Ⅱ is successfully purified and its toxic effects are confirmed in both cell line and mouse model.
7.Clinical Observation of Citalopram in the Treatment of Depression after Lung Cancer Operation
Zhenqing SUN ; Qiang GUO ; Hefei LI ; Haibo WANG ; Jinchi ZU ; Lin SHI ; Yue ZHANG ; Yajing LI ; Wenhua SANG
China Pharmacy 2016;27(17):2415-2416,2417
OBJECTIVE:To observe clinical efficacy and safety of citalopram in the treatment of depression patients after lung cancer operation. METHODS:114 depression patients after lung cancer operation were selected and randomly divided into observa-tion group and control group (n=57). Control group was given routine treatment as nutrition support and electrolyte balance,but had no anti-depression drugs;observation group was given Citalopram tablet 20 mg orally,qd. Two groups were treated for 6 weeks. Clinical efficacy,HAMD and HAMA scores,each score and total score of SF-36 were observed before and after treatment. The occurrence of ADR was recorded. RESULTS:The total effective rate of observation group was 87.72%,which was significant-ly higher than that that of control group(71.93%),with statistical significance(P<0.05);there was no statistical significance in HAMA score,HAMD score,each score and total score of SF-36 between 2 groups before treatment(P>0.05);HAMA score and HAMD score of 2 groups decreased significantly after treatment,the observation group was lower than the control group;each score and total score of SF-36 increased significantly,the observation group was higher than the control group,with statistical sig-nificance(P<0.05). No obvious ADR was found in 2 groups. CONCLUSIONS:Citalopram is effective and safe for depression af-ter lung cancer operation,can improve mental state and quality of life.
8.Predictive value of stimulated thyroglobulin for metastases from differentiated thyroid carcinoma be-fore the first 131Ⅰtreatment
Chengqian LI ; Guoqiang WANG ; Xufu WANG ; Ping REN ; Zhenqing GUO ; Wenjuan ZHAO
Chinese Journal of Nuclear Medicine and Molecular Imaging 2019;39(7):395-399
Objective To explore the relationship between the stimulated thyroglobulin ( sTg) and site, number and diameter of metastatic lesions in patients with differentiated thyroid carcinoma (DTC) before the first 131 I treatment, and to evaluate the predictive value of sTg for different metastatic sites. Methods A total of 567 DTC patients (179 males, 388 females; age: (45.3±12.3) years) who received the first 131Ⅰ treatment between January 2012 and June 2017 were included. Thyroglobulin antibody (TgAb), sTg and thyroid stimulating hormone ( TSH) were determined within 1 week before 131 I treatment. Metastases were detected by ultrasonography, CT or 18 F-fluorodeoxyglucose ( FDG ) PET/CT, 131 I whole-body scan, SPECT/CT imaging and pathology. sTg levels of patients with different metastatic sites and different metasta-sis numbers or lesion diameters were compared ( Kruskal-Wallis H test) . Spearman correlation analysis was performed on the number, diameter and sTg level of metastases. The receiver operating characteristic ( ROC) curve was used to explore the predictive value of sTg before the first 131 I treatment for DTC metasta-sis. Results The median values of sTg in the bone, lung, lymph node metastases groups and non-metasta-sis group were 500.00, 104.40, 27.45, 2.39μg/L, respectively, and there were significant differences, ex-cept for bone and lung metastases groups ( H range: -294.605 to 175.162, all P<0.05) . The sTg levels of lung metastasis group and lymph node metastasis group were both decreased by the order of metastasis num- bers (≥3, =2, =1;H range:-57.887 to 48.763, all P<0.05) . As to the diameter of metastases, the sTg levels of >2.0 cm, 1.1-2.0 cm, and≤1.0 cm subgroups in the lung metastasis group and lymph node me-tastasis group were also decreased in order ( H range: -69.935 to 61.043, all P<0.05) . Spearman correla-tion analysis showed that the number ( rs=0.568, 0.606) and diameter ( rs=0.806, 0.664) of the metasta-ses in the lung and lymph node metastases group were positively correlated with sTg (all P<0.05). Areas under ROC curves for sTg to predict bone, lung and lymph node metastasis were 0.935, 0.843 and 0.791 re-spectively. The threshold values were 197. 65, 23. 21 and 10. 96 μg/L respectively. The sensitivities and the specificities were 91.70%, 79.60%, 67.20% and 97.20%, 80.80%, 82.70% respectively. Conclusions Tg level before the first 131 I treatment has a certain predictive value for the metastasis, metastatic site and num-ber or diameter in DTC patients.
9.Effects comparison of gemstone energy spectrum CT atomic number method and infrared spectroscopy for analyzing composition of urinary calculus
Jiali ZHU ; Yi WANG ; Zhiwei LI ; Qun QIN ; Fuying QIU ; Zexia GUO ; Zeqin YAO ; Houzhou LUO ; Zhenqing HUO ; Bing WENCONG ; Liang LIU
Chongqing Medicine 2017;46(33):4662-4663,4666
Objective To investigate the effects of gemstone energy spectrum CT atomic number method and infrared spec-troscopy for analyzing the composition of urinary calculi and to compare their values in qualitative diagnosis of urinary calculi .Meth-ods Two hundreds and sixty cases of urinary tract stones were performed the gemstone spectrum CT urinary scanning and the stone composition was identified by atomic number method .After removing stone ,the stone composition analyzed by infrared spec-troscopy served as the gold standard .Then the consistency identified by the two methods was analyzed .Results The Kappa consis-tency test results showed that the two kinds of method for identifying stone type had good consistency (Kappa=0 .787 ,P<0 .01) . The paired chi square test results showed that the difference of the two methods for identifying the stone type had no statistical sig-nificance(χ2 =6 .581 ,P=0 .254) .The stone crystal composition types measured by gemstone energy spectrum CT atomic number method were less than those measured by infrared spectroscopy .The precise quantification of the stones with different crystal struc-tures was not as accurate as that of infrared spectroscopy (calcium oxalate monohydrate and calcium oxalate dihydrate ) .Conclusion The two methods for analyzing theurinary stone composition all have clinical significance ,the stone analysis method should be se-lected according to the actual situation .