1.Trends in incidence and mortality of esophageal cancer in cancer registration areas of Anhui Province from 2014 to 2020
ZHU Qiang ; DAI Dan ; MENG Qinglian ; LÜ ; Yili ; DOU Lianjie ; DOU Tingting ; WANG Huadong
Journal of Preventive Medicine 2025;37(10):991-996
Objective:
To investigate the trends in incidence and mortality of esophageal cancer in cancer registration areas of Anhui Province from 2014 to 2020, so as to provide the basis for formulating prevention and control measures.
Methods:
The incidence and mortality data of esophageal cancer in Anhui Province from 2014 to 2020 was collected through the Cancer Registry in Anhui Province. The crude incidence and crude mortality were calculated. The Chinese population-standardized rate was standardized using the age structure of the standard population from the Fifth National Population Census in 2000. The trends in incidence and mortality of esophageal cancer were analyzed using the average annual percent change (APPC), stratified by genders, urban/rural areas, and ages.
Results:
In Anhui Province, the rank of esophageal cancer incidence dropped from the third in 2014 to the sixth in 2020. Concurrently, the crude incidence and Chinese population-standardized incidence declined from 28.74/100 000 and 20.74/100 000 to 19.23/100 000 and 10.59/100 000, respectively (AAPC=-5.846%, -9.658%, both P<0.05). The mortality rank remained stable at the fourth in 2014 and 2020, while the crude mortality and Chinese population-standardized mortality decreased from 19.96/100 000 and 14.09/100 000 to 16.00/100 000 and 8.41/100 000, respectively (AAPC=-3.542%, -7.784%, both P<0.05). The Chinese population-standardized incidence (AAPC=-9.682%, -9.188%, -6.175% and -12.575%, all P<0.05) and Chinese population-standardized mortality (AAPC=-7.734%. -7.447%. -5.366% and -10.209%, all P<0.05) showed declining trends in males, females, urban, and rural areas, respectively. From 2014 to 2020 in Anhui Province, the crude incidence and mortality of esophageal cancer generally increased with age. However, significant declining trends were observed in crude incidence (AAPC=-12.779%, -11.701%, -11.955% and -5.751%, all P<0.05) and crude mortality (AAPC=-12.255%, -11.120%, -10.985% and -5.751%, all P<0.05) for the age groups of 40-<50, 50-<60, 60-<70, 70-<80 years. A significant declining trend in crude incidence was also seen in the ≥80 years group (APPC=-6.334%, P<0.05), but the trend in crude mortality was no statistically significant (P>0.05).
Conclusion
In registration areas of Anhui Province, the incidence and mortality of esophageal cancer exhibited a declining trend from 2014 to 2020, calling for focused attention on the middle-aged and elderly population and enhanced health behaviors such as tobacco and alcohol control.
2.Current status and suggestions on regulation of traditional Chinese medicine raw materials and preparations under regulatory system of drugs.
Li-Ping QU ; Yong-Dan XU ; Wei-Jing HE ; Ding-Kun ZHANG ; Nan YANG ; Min-Xian SONG ; Zhi-Qiang MIN ; Ting-Mo ZHANG
China Journal of Chinese Materia Medica 2025;50(3):824-832
At present, the cause of traditional Chinese medicine(TCM) in China has entered a new period of high-quality development. How to strengthen the foundation for the TCM industry from the source is an important issue that deserves the attention of the authorities, industry, and academia. This study systematically analyzed the regulatory system of TCM raw materials and preparations. The study took the TCM industry chain and the product life cycle as a clue and focused on the dimensions of TCM resource protection and plant cultivation(farming), production and quality supervision of TCM raw materials and preparations, and their market access and distribution. It analyzed the current situation of the regulation of TCM raw materials and preparations under the regulatory system of drugs, discussed the main problems, and put forward corresponding suggestions. The results can provide an important reference value for the subsequent improvement of the regulatory system of drugs and the construction of a prominent regulatory system of drugs in accordance with TCM characteristics.
Drugs, Chinese Herbal/economics*
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Medicine, Chinese Traditional/standards*
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China
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Quality Control
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Humans
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Plants, Medicinal/chemistry*
3.Qualitative and quantitative analysis of chemical components of different processed products of Corni Fructus by UPLC-Q-TOF-MS and UPLC-QqQ-MS/MS.
Li-Qiang ZHANG ; Guo-Shun SHAN ; Yi-Dan HONG ; Si-Han LIU ; Guo-Wei XU ; Hui GAO ; Wei WANG ; Cheng-Guo JU
China Journal of Chinese Materia Medica 2025;50(8):2145-2158
Qualitative and quantitative analysis methods for chemical components of different processed products of Corni Fructus were established to systematically characterize and identify these components, and the content of the main differential components was determined. The chemical components of different processed products of Corni Fructus were collected using ultra-high performance liquid chromatography-quadrupole time-of-flight tandem mass spectrometry(UPLC-Q-TOF-MS). Through analysis of self-built databases, literature, and reference standards, a total of 93 components were obtained, including 19 iridoids, 15 flavonoids, 16 organic acids, eight triterpenoids, eight tannins, four amino acids, two polysaccharides, five olefins, and 16 other compounds. Additionally, by using multivariate statistical methods, the differential components between different processed products of Corni Fructus were screened under the conditions of VIP>1.0 and FC<0.5 or FC>2.0 and P<0.05. The PCA and OPLS-DA results showed differences in the chemical components between different processed products of Corni Fructus. A total of 21 differential components were screened, including tartaric acid, morroniside, and rutin. On this basis, ultra-high performance liquid chromatography-triple quadrupole tandem mass spectrometry(UPLC-QqQ-MS/MS) was used to determine the content of 10 main common differential components, including gallic acid, morroniside, ursolic acid, loganin, swertiamarin, rutin, 5-hydroxymethylfurfural, cornuside Ⅰ, quercetin, and oleanolic acid. The above 10 components showed a good linear relationship within the determined concentration range, with the precision, stability, repeatability, and sample recovery rate all meeting the requirements. Compared with that in Corni Fructus, the content of iridoid glycosides in wine-prepared Corni Fructus and wine-and honey-prepared Corni Fructus decreased, while the content of gallic acid, rutin, quercetin, 5-hydroxymethylfurfural, ursolic acid, and oleanolic acid increased. Compared with wine-prepared Corni Fructus, wine-and honey-prepared Corni Fructus showed varying degrees of increase in all other components, except for a slight decrease in gallic acid content. In summary, this study clarified the influence of different processing methods on the chemical components of Corni Fructus, providing a theoretical basis for the scientific connotation, overall quality evaluation, and clinically rational application of Corni Fructus processing in the future.
Tandem Mass Spectrometry/methods*
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Chromatography, High Pressure Liquid/methods*
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Cornus/chemistry*
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Drugs, Chinese Herbal/chemistry*
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Fruit/chemistry*
4.A Novel Model of Traumatic Optic Neuropathy Under Direct Vision Through the Anterior Orbital Approach in Non-human Primates.
Zhi-Qiang XIAO ; Xiu HAN ; Xin REN ; Zeng-Qiang WANG ; Si-Qi CHEN ; Qiao-Feng ZHU ; Hai-Yang CHENG ; Yin-Tian LI ; Dan LIANG ; Xuan-Wei LIANG ; Ying XU ; Hui YANG
Neuroscience Bulletin 2025;41(5):911-916
5.Comparison of pediatric pelvic fractures and associated injuries caused by different types of road traffic accidents
Bao-Jian SONG ; Qiang WANG ; Wei FENG ; Dan-Jiang ZHU ; Xue-Jun ZHANG
Chinese Journal of Traumatology 2024;27(6):372-379
Purpose::To explore the clinical characteristics of pediatric pelvic fracturs caused by traffic accidents and to analyze the accompanying injuries and complications.Methods::A total of 222 cases involved traffic accidents was enrolled in this case-control study. The data of children with pelvic fractures caused by traffic accidents who were admitted to our hospital from January 2006 to December 2021 were analyzed retrospectively. Sex, age, Tile classification, abbreviated injury scale score, injury severity score, mortality, and accompanying injuries were studied. The ANOVA was used for measurement data, and the non-parametric rank sum test was used for non-normally distributed data. The Fisher's exact probability method was used for the count data.Results::Of all enrolled cases, 140 are boys and 82 are girls, including 144 cases aged < 6 years, 65 aged between 6 and 12 years, and 13 aged > 12 years. Depending on the injury mechanism, there are 15 cases involving pedestrians vs. motorcycles (PVM), 91 cases involving pedestrians vs. passenger cars (PVC), 78 cases involving pedestrians vs. commercial vehicles (PVV), and 38 cases involving motor vehicles vs. motor vehicles (MVM). Associated injuries are reported in 198 cases (89.2%), primarily involving the abdomen injury in 144 cases (64.9%), and lower limb injury in 99 cases (44.6%). PVV injury involves longer hospital stay ( p =0.004). Intensive care unit admission rate is significantly higher in the MVM group than in other groups ( p =0.004). Head injury ( p =0.001) and face injury ( p =0.037) are more common in the MVM group, whereas abdominal injury ( p =0.048) and lower limb injury ( p =0.037) are more common in the PVV group. In the MVM group, the brain injury ( p =0.004) and femoral neck injury ( p =0.044) are more common. In the PVM group, the mediastinum ( p =0.004), ear ( p =0.009), lumbar vertebrae ( p =0.008), and spinal cord ( p =0.011) are the most vulnerable regions, while in the PVV group, the perineum ( p < 0.001), urethra ( p =0.001), rectum ( p =0.006), anus ( p =0.004), and lower limb soft tissues ( p =0.024) are the most vulnerable regions. Children aged > 12 years have higher pelvic abbreviated injury scale scores ( p =0.019). There are significant differences in the classification of pelvic fractures among children < 6, 6 -12, and > 12 years of age, with Tile C being more likely to occur in children > 12 years of age ( p =0.033). Children aged > 12 years are more likely to sustain injuries to the spleen ( p =0.022), kidneys ( p =0.019), pancreas ( p < 0.001), lumbar vertebrae ( p =0.013), and sacrum ( p =0.024). The MVM group has the highest complication rate ( p =0.003). Conclusion::PVC is the leading cause of the abdomen and lower extremities injury and has the most concomitant injuries. Different traffic injuries often lead to different associated injuries. Older children are more likely to sustain more severe pelvic fractures and peripelvic organs injuries. The MVM group has the highest extent of injury and complication rates.
6.Preparation of self-assembling peptide-based hydrogels and its application in traumatic hemorrhage of hepatic parenchymal
Wang YING ; Jie LUO ; Chuanhao ZHENG ; Ruijue DAN ; Shali TAN ; Qiang LUO
Journal of Army Medical University 2024;46(11):1206-1213
Objective To prepare FLIVIGSII peptide(FI peptide)and investigate its physicochemical properties and hemostatic effect in vivo and in vitro.Methods The self-assembling peptide-based hydrogels were prepared by the FI peptide mixed with water.After gross observation for the hydrogel state of the FI peptide,scanning electron microscopy(SEM)and transmission electron microscopy(TEM)were used for its microstructure,and dynamic light scattering(DLS)was performed for its size.The hemostatic effect of FI peptide after being mixed with blood samples treated with 3.8%sodium citrate was observed,and the microstructure of the blood clot was observed with SEM.CCK-8 assay and hemolysis assay were performed to verify its biocompatibility.After a rat model of hepatic parenchymal perforation and hemorrhage was established,15 female SD rats(6~8 weeks old,weighing 150 g)were randomly divided into control group,FI peptide group and fibrin sealant group.The hemostatic effect of FI peptide and prognosis was observed and analyzed after treatment in each group,and the hemostatic mechanism was also investigated.Results FI peptides were successfully prepared,and it could rapidly self-assemble into a nanofiber network hydrogel in water,and further cause formation of blood clots.SEM showed that FI peptides self-assembled to form fibrous hydrogels after mixing with water.TEM results verified that the FI peptide formed into nanofibers in a diameter of 13.70±2.31 nm after gelatinization in water,and DLS results verified that the FI peptide formed polydisperse and multi-size nanofibers in water(in a range of 148.2~208.0 nm or 575.0~807.0 nm).The fibrous hydrogel formed by the FI peptide mixed with the blood could envelop the red blood cells,thus form a physical hemostatic barrier to achieve blood clotting in seconds.FI peptide hydrogel had no cytotoxicity to normal hepatocytes(L-O2 cells)and did not cause hemolysis of red blood cells.In in vivo experiment,FI peptide quickly formed nanofiber hydrogel when in contact with blood,thus formed physical hemostasis barrier to achieve hemostasis within a few seconds(hemostasis time<5 s).Conclusion The FI peptide exhibits a rapid and efficient hemostatic effect,indicating a promising clinical application in the hemostasia of hepatic parenchymal traumatic hemorrhage.
7.Observation of the efficacy of Vonoprazan dual therapy in the eradication of Helicobacter pylori
Shi-Ling WANG ; Dan-Ni CHEN ; Zhao LIU ; Zhao-Li MA ; Qiang LI ; Hong LU ; Min LIU ; Xi GOU ; Jun WANG ; Xiao-Chuang SHU ; Qian REN
Modern Interventional Diagnosis and Treatment in Gastroenterology 2024;29(3):265-269
Objective This paper intends to compare the efficacy and safety of high-dose dual regimens containing Vonoprazan and proton pump inhibitor in patients infected with Helicobacter pylori(H.pylori).Methods A prospective randomized controlled study was conducted.According to inclusion and exclusion criteria.,243 patients with H.pylori infection admitted to the Department of Gastroenterology,the First Hospital of Lanzhou University from February 2023 to December 2023 were enrolled as the research objects.They were randomly divided into two groups.The high-dose dual therapy containing Vonoprazan group(VPZ-HDDT group)was given Vonoprazan fumarate tablet 20mg twice daily plus amoxicillin 750 mg four times daily for 14 days and the high-dose combination group containing PPI(PPI-HDDT group)was given esomeprazole 40 mg twice daily plus amoxicillin 750 mg four times daily for 14 days.Patients were followed up and recorded by telephone or WeChat on the 7th and 14th day of starting treatment for drug intake and occurrence of adverse reactions.Patients were instructed to recheck the 13C or 14C urea breath test at least 1 month after the end of medication.Treatment by protocol(PP)analysis,modified intention to treat(mITT)and intention-to-treat(ITT)analysis were used for H.pylori eradication rates in both groups,and compliance and incidence of adverse reactions were compared between the two groups.Results The eradication rates of the VPZ-HDDT group and the PPI-HDDT group in the initial treatment were 94.0%and 88.5%(P=0.209)by PP analysis,and 91.8%and 87.5%(P=0.358)86.7%by mITT analysis,and 81.9%(P=0.377)by ITT analysis,respectively.In the retreated patients,the PP analysis and mITT analysis eradication rates in these two groups were consistent,87.0%and 84.2%(P=0.800),respectively,and 83.3%and 76.2%(P=0.550)by ITT analysis.For the refractory H.pylori patients,the PP analysis and mITT analysis eradication rates in these two groups were also consistent,71.4%and 50.0%(P=0.429),and the eradication rates of ITT analysis were 62.5%and 50.0%(P=0.640),respectively.In different stratifications,the eradication rates of the VPZ-HDDT group were higher than those of the PPI-HDDT group,but the differences were not statistically significant.The incidence of adverse reactions and compliance of the VPZ-HDDT group and the PPI-HDDT group were similar,with no statistically significant differences.Conclusion Both two combination regimens can achieve clinically acceptable eradication rates(>85%)in the first-time treatment patients.For the retreated and refractory patients,the choice of vonoprazan is more beneficial.
8.Catalpol from Rehmannia glutinosa regulates senescence in ATDC5 chondrocytes
Ruiying JIA ; Jie MEI ; Qiang HE ; Dan LI ; Xin SUN ; Weiqing QIAN ; Zhen LIU
Chinese Journal of Tissue Engineering Research 2024;28(34):5467-5472
BACKGROUND:The results of in vivo and in vitro studies showed that catalpol from Rehmannia glutinosa can significantly reduce the level of inflammatory indexes in the synovial tissue of rats with knee osteoarthritis,and meanwhile,it can delay the progression of knee osteoarthritis.But whether catalpol from Rehmannia glutinosa affects chondrocyte senescence and then delay the progression of knee osteoarthritis has not yet been clarified. OBJECTIVE:To investigate investigate whether catalpol from Rehmannia glutinosa could regulate ATDC5 chondrocyte senescence and the possible mechanisms. METHODS:ATDC5 chondrocytes were divided into blank group(0.1%bovine serum albumin),model group(0.1%bovine serum albumin+1 μmol/L adriamycin),low-dose catalpol group(0.1%bovine serum albumin+1 μmol/L adriamycin+20 μmol/L catalpol from Rehmannia glutinosa)and high-dose catalpol group(0.1%bovine serum albumin+1 μmol/L adriamycin+80 μmol/L catalpol from Rehmannia glutinosa).Adriamycin-induced ATDC5 chondrocyte senescence model was constructed,and the corresponding treatments were given according to the above groups.Cell counting kit-8 assay was used to detect the effects of catalpol from Rehmannia glutinosa on ATDC5 chondrocyte viability,and to screen the optimal concentration of catalpol from Rehmannia glutinosa.The senescence of ATDC5 chondrocytes in each group was detected by β-galactosidase staining after the corresponding treatments.Real-time fluorescence quantitative PCR and western blot were used to detect the mRNA and protein expression of P21,P53,type II collagen,matrix metalloproteinase 13,and interleukin-6.Immunofluorescence method was used to detect the expression of P21,P53 and type II collagen.Flow cytometry was used to detect apoptosis in each group. RESULTS AND CONCLUSION:ATDC5 chondrocytes were identified to be successfully induced and senescence model was induced.Catalpol from Rehmannia glutinosa at the concentrations of 0,20,40,and 80 μmol/L showed no significant effects on the cell viability,suggesting that catalpol from Rehmannia glutinosa is non-cytotoxic and can be used safely(P>0.05);when the concentration was≥100 μmol/L,the cell viability was reduced,suggesting that there may be cytotoxic.Therefore,80 μmol/L was chosen as the high dose for subsequent experiments in this study.The percentage of positive cells in the model group was(86.93±2.18)%,which was significantly higher than that in the blank group[(17.32±0.72)%;P<0.05].Compared with the model group,the percentage of positive cells was significantly lower in the low-and high-dose catalpol groups[(57.28±1.73)%and(27.18±0.97)%,respectively;both P<0.05].Compared with the model group,the relative expression of P21,P53,matrix metalloproteinase 13,and interleukin-6 at mRNA and protein levels was significantly downregulated in the low-and high-dose catalpol groups,while the relative expression of type II collagen at mRNA and protein levels was significantly upregulated in both groups(P<0.05),especially in the high-dose catalpol group(P<0.05).Compared with the model group,the fluorescence intensities of P21 and P53 were significantly weakened in the low-and high-dose catalpol groups,while the fluorescence intensity of type II collagen was significantly enhanced in the low-and high-dose catalpol groups(P<0.05),especially in the high-dose catalpol group(P<0.05).The cell apoptosis detected by Annexin V/PI method showed that there was no significant difference between the model group and the blank group(P>0.05);compared with the model group,the apoptotic index was significantly elevated in the low-and high-dose catalpol groups,especially in the high-dose catalpol group(P<0.05).To conclude,catalpol from Rehmannia glutinosa can slow the progression of osteoarthritis by promoting apoptosis of senescent ATDC5 chondrocytes,further removing senescent ATDC5 chondrocytes,and decreasing the senescence-associated phenotypes.
9.Clinical prediction models of radiation-induced rectal injury after brachytherapy combined with external beam radiation therapy for cervical cancer
Baojie CHEN ; Lu CAO ; Yuanhang YU ; Qiang ZHAO ; Shansha XIE ; Dan DU ; Xianfu LI
Chinese Journal of Radiological Medicine and Protection 2024;44(2):119-126
Objective:To explore the dosimetric differences of different dose accumulation method for brachytherapy combined with external beam radiation therapy (EBRT) of cervical cancer and establish clinical prediction models for radiation-induced late rectal injury (RLRI) after radiotherapy.Methods:A retrospective analysis was conducted for the clinical data of patients who received radical concurrent chemoradiotherapy (CCRT) for cervical cancer in the Department of Oncology of the Affiliated Hospital of North Sichuan Medical College from January 1, 2020 to November 30, 2021. EBRT combined with brachytherapy was employed for the patients, and dose assessment was performed in two means: the direct accumulation using equivalent dose in 2-Gy fractions (EQD2) and deformable image registration (DIR)-based dose accumulation of 3D planning images. The toxicity criteria of the Radiation Therapy Oncology Group were adopted as the RLRI grading criteria. The prediction models of RLRI using both dose assessment method were constructed. The areas under the receiver operating characteristic (ROC) curves were calculated to assess the predictive accuracy of the different dose assessment method.Results:In the case of brachytherapy, the D95% and D90% EQD2 doses to high-risk clinical target volumes (HR-CTVs) were 2.18 and 2.92 Gy higher respectively and the D2 cm 3, D1 cm 3, and D0.1 cm 3 EQD2 doses to the rectal were 1.74, 2.28, and 2.26 Gy higher, respectively compared to DIR-based dose accumulation ( t = 3.82, 5.21, 4.58, 5.17, 2.05, P < 0.05). For EBRT combined with brachytherapy, the D2 cm 3, D1 cm 3, and D0.1 cm 3 EQD2 doses to the rectal were 6.22, 7.61, 9.56 Gy higher than DIR-based doses, respectively, and the dosimetric differences were statistically significant ( t = 9.40, 10.59, 7.87, P < 0.001). The joint prediction model yielded an area under the ROC curve of 0.788. The sensitivity and specificity of the optimal cut-off value were 0.850 and 0.660, respectively. Furthermore, the Hosmer-Lemeshow goodness-of-fit tests indicated high goodness-of-fit ( P > 0.05). The prediction model for DIR-based dose accumulation of traditional predictors yielded areas under the ROC curves for D2 cm 3 and D1 cm 3 to the rectal of 0.784 and 0.763, respectively. The sensitivities of the optimal cut-off values were 0.850 and 0.750, respectively, and the specificities were 0.679 and 0.717, respectively. Conclusions:There are dosimetric differences between the direct dose accumulation using EQD2 and DIR-based dose accumulation of 3D planning images for brachytherapy combined with EBRT. Both the joint prediction model and the DIR-based dose accumulation of D2 cm 3 and D1 cm 3 to the rectal are effective in predicting RLRI. Given the complex calculation of the joint prediction model, it is recommended that RLRI should be predicted through DIR-based dose accumulation of D2 cm 3 and D1 cm 3 to the rectal clinically.
10.National bloodstream infection bacterial resistance surveillance report (2022) : Gram-negative bacteria
Zhiying LIU ; Yunbo CHEN ; Jinru JI ; Chaoqun YING ; Qing YANG ; Haishen KONG ; Haifeng MAO ; Hui DING ; Pengpeng TIAN ; Jiangqin SONG ; Yongyun LIU ; Jiliang WANG ; Yan JIN ; Yuanyuan DAI ; Yizheng ZHOU ; Yan GENG ; Fenghong CHEN ; Lu WANG ; Yanyan LI ; Dan LIU ; Peng ZHANG ; Junmin CAO ; Xiaoyan LI ; Dijing SONG ; Xinhua QIANG ; Yanhong LI ; Qiuying ZHANG ; Guolin LIAO ; Ying HUANG ; Baohua ZHANG ; Liang GUO ; Aiyun LI ; Haiquan KANG ; Donghong HUANG ; Sijin MAN ; Zhuo LI ; Youdong YIN ; Kunpeng LIANG ; Haixin DONG ; Donghua LIU ; Hongyun XU ; Yinqiao DONG ; Rong XU ; Lin ZHENG ; Shuyan HU ; Jian LI ; Qiang LIU ; Liang LUAN ; Jilu SHEN ; Lixia ZHANG ; Bo QUAN ; Xiaoping YAN ; Xiaoyan QI ; Dengyan QIAO ; Weiping LIU ; Xiusan XIA ; Ling MENG ; Jinhua LIANG ; Ping SHEN ; Yonghong XIAO
Chinese Journal of Clinical Infectious Diseases 2024;17(1):42-57
Objective:To report the results of national surveillance on the distribution and antimicrobial resistance profile of clinical Gram-negative bacteria isolates from bloodstream infections in China in 2022.Methods:The clinical isolates of Gram-negative bacteria from blood cultures in member hospitals of national bloodstream infection Bacterial Resistant Investigation Collaborative System(BRICS)were collected during January 2022 to December 2022. Antibiotic susceptibility tests were conducted by agar dilution or broth dilution methods recommended by Clinical and Laboratory Standards Institute(CLSI). WHONET 5.6 and SPSS 25.0 software were used to analyze the data.Results:During the study period,9 035 strains of Gram-negative bacteria were collected from 51 hospitals,of which 7 895(87.4%)were Enterobacteriaceae and 1 140(12.6%)were non-fermenting bacteria. The top 5 bacterial species were Escherichia coli( n=4 510,49.9%), Klebsiella pneumoniae( n=2 340,25.9%), Pseudomonas aeruginosa( n=534,5.9%), Acinetobacter baumannii complex( n=405,4.5%)and Enterobacter cloacae( n=327,3.6%). The ESBLs-producing rates in Escherichia coli, Klebsiella pneumoniae and Proteus spp. were 47.1%(2 095/4 452),21.0%(427/2 033)and 41.1%(58/141),respectively. The prevalence of carbapenem-resistant Escherichia coli(CREC)and carbapenem-resistant Klebsiella pneumoniae(CRKP)were 1.3%(58/4 510)and 13.1%(307/2 340);62.1%(36/58)and 9.8%(30/307)of CREC and CRKP were resistant to ceftazidime/avibactam combination,respectively. The prevalence of carbapenem-resistant Acinetobacter baumannii(CRAB)complex was 59.5%(241/405),while less than 5% of Acinetobacter baumannii complex was resistant to tigecycline and polymyxin B. The prevalence of carbapenem-resistant Pseudomonas aeruginosa(CRPA)was 18.4%(98/534). There were differences in the composition ratio of Gram-negative bacteria in bloodstream infections and the prevalence of main Gram-negative bacteria resistance among different regions,with statistically significant differences in the prevalence of CRKP and CRPA( χ2=20.489 and 20.252, P<0.001). The prevalence of CREC,CRKP,CRPA,CRAB,ESBLs-producing Escherichia coli and Klebsiella pneumoniae were higher in provinicial hospitals than those in municipal hospitals( χ2=11.953,81.183,10.404,5.915,12.415 and 6.459, P<0.01 or <0.05),while the prevalence of CRPA was higher in economically developed regions(per capita GDP ≥ 92 059 Yuan)than that in economically less-developed regions(per capita GDP <92 059 Yuan)( χ2=6.240, P=0.012). Conclusions:The proportion of Gram-negative bacteria in bloodstream infections shows an increasing trend,and Escherichia coli is ranked in the top,while the trend of CRKP decreases continuously with time. Decreasing trends are noted in ESBLs-producing Escherichia coli and Klebsiella pneumoniae. Low prevalence of carbapenem resistance in Escherichia coli and high prevalence in CRAB complex have been observed. The composition ratio and antibacterial spectrum of bloodstream infections in different regions of China are slightly different,and the proportion of main drug resistant bacteria in provincial hospitals is higher than those in municipal hospitals.


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