Objective To establish a gas chromatography-mass spectrometry (GC-MS) method for the simultaneous determination of four carbonate compounds (CCs), including ethyl methyl carbonate (EMC), diethyl carbonate (DEC), vinylene carbonate (VC), and ethylene carbonate (EC) in workplace air. Methods Vapor-phase EMC, DEC, VC, and EC in workplace air were collected using activated carbon tubes. After desorption with dichloromethane, the samples were analyzed by GC-MS. Qualitative identification was performed based on retention times and characteristic ions, while quantitative analysis was conducted using peak areas of selected characteristic ions. Results The quantitative determination ranges for the four CCs were from 0.57×10⁻³ to 200.00 mg/L, with correlation coefficients ≥0.999 45. The detection limit ranged from 0.17 to 1.60 μg/L, and the lower limit of quantification ranged from 0.57 to 5.33 μg/L. The minimum detection concentration and minimum quantitation concentration were 0.11-1.07 and 0.38-3.55 μg/m³, respectively. Mean spiked recoveries ranged from 85.70% to 111.65%. The intra- and inter-batch relative standard deviations were 0.11%-2.04% and 1.27%-5.18%, respectively. Mean desorption efficiencies of the method ranged from 74.70% to 118.20%. EMC, DEC, and EC samples were stable for up to five days at 4 °C, while VC samples were stable for up to three days at 4 °C. Conclusion The GC-MS method is suitable for the simultaneous determination of the four CCs including EMC, DEC, VC, and EC in workplace air.

OBJECTIVES: To explore the effect of quercetin for mitigating HIV-1 gp120-induced astrocyte neurotoxicity and its underlying mechanism. METHODS: Primary rat astrocytes were isolated and treated with quercetin, HIV-1 gp120, or gradient concentrations of quercetin combined with HIV-1 gp120. The formation of stress granules (SGs) in the treated cells was observed with immunofluorescence assay, and the levels of oxidative stress markers and protein expressions were measured using specific assay kits and Western blotting. HIV-1 gp120 transgenic mice were treated with quercetin (50 mg/kg) by gavage for 4 weeks, and the changes in cognitive functions and oxidative stress levels were examined by behavioral assessments, oxidative stress index analysis in serum, and immunohistochemical and Western blotting of the brain tissue. RESULTS: In primary rat astrocytes, treatment with quercetin significantly reduced HIV-1 gp120-induced SG formation, increased the levels of antioxidant indexes, decreased the levels of oxidative substances, and up-regulated protein level associated with SG depolymerization. In the transgenic mouse models, quercetin obviously improved the cognitive function of the rats, reduced oxidative stress levels, and promoted the expression of proteins associate with SG depolymerization in the brain tissues. CONCLUSIONS Quercetin mitigates HIV-1 gp120-induced astrocyte neurotoxicity and cognitive function impairment by inhibiting oxidative stress, enhancing expressions of SG depolymerization-related proteins, and promoting SG disassembly, suggesting the value of quercetin as a potential therapeutic agent for neuroprotection in HIV-associated neurocognitive disorders.
Animals ; Quercetin/pharmacology* ; Astrocytes/metabolism* ; HIV Envelope Protein gp120 ; Oxidative Stress/drug effects* ; Rats ; Stress Granules/drug effects* ; Mice ; Mice, Transgenic ; Rats, Sprague-Dawley ; Cells, Cultured

Objective This study aimed to investigate the antimicrobial resistance profiles of bacterial strains isolated from pediatric intensive care units(PICU)in China for better antimicrobial therapy.Methods Clinical isolates were collected from 17 institutions,including tertiary care children's hospitals and pediatric department of tertiary general hospitals in China from January 1,2020 to December 31,2022.Antimicrobial susceptibility testing was carried out according to a unified protocol using Kirby-Bauer method or automated systems.Results were interpreted according to the breakpoints released by the Clinical and Laboratory Standards Institute(CLSI)in 2020.Results A total of 10 688 isolates were collected,including gram-positive organisms(39.2％)and gram-negative organisms(60.8％).The top three organisms were S.aureus(13.6％,1 453/10 688),A.baumannii(10.0％,1 067/10 688),and coagulase-negative Staphylococcus(9.9％,1 058/10 688).Multi-drug resistant organisms(MDROs)were very common in children.The prevalence of methicillin-resistant Staphylococcus aureus(MRSA),carbapenem-resistant Enterobacterales(CRE),carbapenem-resistant E.coli,carbapenem-resistant K.pneumoniae(CRKP),carbapenem-resistant A.baumannii(CRAB),and carbapenem-resistant P.aeruginosa(CRPA)was 41.1％,19.4％,8.8％,30.9％,67.4％,and 28.8％,respectively.Overall,more than 50％of Enterobacteriales isolates were resistant to cephalosporins,while nearly 25％of Enterobacteriales isolates were resistant to carbapenems.MDROs were highly resistant to commonly used antibiotics.More than 80％of CRE and CRAB strains were resistant to all beta-lactam antibiotics.CRE and CRAB showed low resistance rates to tigecycline and polymyxin.CRPA showed lower resistance rates to piperacillin,beta-lactamase inhibitor combinations than the resistance rates to third and fourth generation cephalosporins.All of the Staphylococcus and Enterococcus isolates were susceptible to vancomycin and tigecycline.None of PRSP strains isolated from meningitis and nonmeningitis samples were resistant to rifampicin,vancomycin,or linezolid.The prevalence of β-lactamase-negative ampicillin-resistant(BLNAR)strains was 43.3％in Haemophilus influenzae.Conclusions MDROs were prevalent in PICU.It is necessary to establish an effective multidisciplinary team(MDT)to control the antimicrobial resistance.

Objective To investigate the clinical efficacy and safety of two thrombus thrombectomy devices,AcoStream and AngioJet,in the treatment of acute iliofemoral vein thrombosis(AIFVT).Methods A total of 97 AIFVT patients were treated with different thrombus clearing devices according to their states of illness,and patients were divided into the AcoStream group(41 cases)and the AngioJet group(56 cases).The thrombus clearing status,degree of swelling reduction in affected limb,surgical time and intraoperative blood loss were compared between the two groups,and the need for assisted catheter contact thrombolysis(CDT)treatment,urokinase dosage,iliac vein stent placement,incidence of complications,length of hospital stay and hospitalization costs were also compared between the two groups.Regular follow-up was conducted to record for recurrence of thrombosis,the patency of the stent,deep vein thrombosis syndrome(PTS)and PTS degree were evaluated in lower limbs.Results There were no significant differences in age,gender,affected limb,time of illness,site of illness and causes of illness between the two groups(P＞0.05).The operation was successful in both groups and the thrombus removal effect was satisfactory.There were no significant differences in terms of thrombus clearance rate,the degree of swelling reduction in the limb 48 hours after surgery and assisted CDT rate between the two groups(P＞0.05).Compared with the AcoStream group,the AngioJet group had a longer surgical time,reduced intraoperative blood loss,increased hospitalization costs and higher rates of complications(P＜0.05).There was no significant difference in the recurrence rate of thrombosis between the two groups(P＞0.05),and there was no occurrence of iliac vein stent occlusion or PTS in either patients.Conclusion Two mechanical thrombus clearing devices of AcoStream and AngioJet are safe and effective for treating AIFVT.

Objective To investigate the clinical efficacy and safety of two thrombus thrombectomy devices,AcoStream and AngioJet,in the treatment of acute iliofemoral vein thrombosis(AIFVT).Methods A total of 97 AIFVT patients were treated with different thrombus clearing devices according to their states of illness,and patients were divided into the AcoStream group(41 cases)and the AngioJet group(56 cases).The thrombus clearing status,degree of swelling reduction in affected limb,surgical time and intraoperative blood loss were compared between the two groups,and the need for assisted catheter contact thrombolysis(CDT)treatment,urokinase dosage,iliac vein stent placement,incidence of complications,length of hospital stay and hospitalization costs were also compared between the two groups.Regular follow-up was conducted to record for recurrence of thrombosis,the patency of the stent,deep vein thrombosis syndrome(PTS)and PTS degree were evaluated in lower limbs.Results There were no significant differences in age,gender,affected limb,time of illness,site of illness and causes of illness between the two groups(P＞0.05).The operation was successful in both groups and the thrombus removal effect was satisfactory.There were no significant differences in terms of thrombus clearance rate,the degree of swelling reduction in the limb 48 hours after surgery and assisted CDT rate between the two groups(P＞0.05).Compared with the AcoStream group,the AngioJet group had a longer surgical time,reduced intraoperative blood loss,increased hospitalization costs and higher rates of complications(P＜0.05).There was no significant difference in the recurrence rate of thrombosis between the two groups(P＞0.05),and there was no occurrence of iliac vein stent occlusion or PTS in either patients.Conclusion Two mechanical thrombus clearing devices of AcoStream and AngioJet are safe and effective for treating AIFVT.

Objective This study aimed to investigate the antimicrobial resistance profiles of bacterial strains isolated from pediatric intensive care units(PICU)in China for better antimicrobial therapy.Methods Clinical isolates were collected from 17 institutions,including tertiary care children's hospitals and pediatric department of tertiary general hospitals in China from January 1,2020 to December 31,2022.Antimicrobial susceptibility testing was carried out according to a unified protocol using Kirby-Bauer method or automated systems.Results were interpreted according to the breakpoints released by the Clinical and Laboratory Standards Institute(CLSI)in 2020.Results A total of 10 688 isolates were collected,including gram-positive organisms(39.2％)and gram-negative organisms(60.8％).The top three organisms were S.aureus(13.6％,1 453/10 688),A.baumannii(10.0％,1 067/10 688),and coagulase-negative Staphylococcus(9.9％,1 058/10 688).Multi-drug resistant organisms(MDROs)were very common in children.The prevalence of methicillin-resistant Staphylococcus aureus(MRSA),carbapenem-resistant Enterobacterales(CRE),carbapenem-resistant E.coli,carbapenem-resistant K.pneumoniae(CRKP),carbapenem-resistant A.baumannii(CRAB),and carbapenem-resistant P.aeruginosa(CRPA)was 41.1％,19.4％,8.8％,30.9％,67.4％,and 28.8％,respectively.Overall,more than 50％of Enterobacteriales isolates were resistant to cephalosporins,while nearly 25％of Enterobacteriales isolates were resistant to carbapenems.MDROs were highly resistant to commonly used antibiotics.More than 80％of CRE and CRAB strains were resistant to all beta-lactam antibiotics.CRE and CRAB showed low resistance rates to tigecycline and polymyxin.CRPA showed lower resistance rates to piperacillin,beta-lactamase inhibitor combinations than the resistance rates to third and fourth generation cephalosporins.All of the Staphylococcus and Enterococcus isolates were susceptible to vancomycin and tigecycline.None of PRSP strains isolated from meningitis and nonmeningitis samples were resistant to rifampicin,vancomycin,or linezolid.The prevalence of β-lactamase-negative ampicillin-resistant(BLNAR)strains was 43.3％in Haemophilus influenzae.Conclusions MDROs were prevalent in PICU.It is necessary to establish an effective multidisciplinary team(MDT)to control the antimicrobial resistance.

Objective:To understand the current knowledge, attitude, and practice (KAP) on influenza and influenza vaccine among pregnant women in Suzhou and to analyze its influencing factors to provide technical support data for public health strategies for promoting influenza vaccination in pregnant women.Methods:A questionnaire was designed, and a stratified sampling method was used to conduct a face-to-face survey among pregnant women at different stages of pregnancy who received antenatal examinations at different levels of medical institutions in Suzhou, Jiangsu Province, in 2023. KAP status and influencing factors were analyzed by χ2 test and logistic regression analysis. Results:A total of 2 195 valid questionnaires were collected in this survey. The M( Q1, Q3) of knowledge about influenza and influenza vaccine among pregnant women in Suzhou was 7.60 (5.23, 9.80) points, and the score range was 0.20-14.71 points, the passing rate was 34.12%, the awareness rate of influenza vaccine was 57.45%, and the vaccination rate of influenza vaccine was 1.91% within one year before the survey. The willingness to receive influenza vaccine during pregnancy was only 3.57%. Multivariate analysis of influenza and influenza vaccine-related knowledge scores showed that the passing rate was positively correlated with education level and gestational age. In contrast, family income was negatively correlated with living in rural areas, working as migrant workers, and having no medical insurance. Multivariate analysis of vaccination intention showed that decreased effectiveness of influenza vaccine and increased adverse reactions decreased vaccination intention during pregnancy. Conclusions:The pregnant women in Suzhou pay more attention to influenza, and vaccination rates and intentions are generally low. Pregnant women with early and second trimester of pregnancy, low education, living in rural areas, working as migrant workers, and not purchasing medical insurance are the key groups to popularize the knowledge about influenza and influenza vaccine.

This article reported a prenatally diagnosed case of complete ring chromosome 15. A 38-year-old woman who conceived by in vitro fertilization and frozen embryo transfer underwent amniocentesis for prenatal diagnosis at 18 +5 weeks of gestation due to advanced maternal age. The result of G-banding karyotyping was mos 46,XX,r(15)[88]/45,X,-15[11]/46,XX,r(15;15)[1]. No numerical abnormalities of chromosomes or definite pathogenic copy number variations (CNVs) were detected by chromosomal microarray analysis. Amniocentesis was performed again at 31 +6 weeks of gestation. The result of genome copy number variation sequencing indicated no pathogenic CNV and fluorescence in situ hybridization on cultured amniocytes revealed nuc ish(15q)×1[15]/(15q)×3[5]/(15q)×2[80]. Based on all the prenatal diagnosis results, it was suggested that the fetus carried a complete ring chromosome 15. As the peripheral blood chromosomes of the couple were normal and no obvious abnormalities were detected by the prenatal ultrasound either in our hospital or another hospital, the pregnant woman decided to continue the pregnancy after genetic counseling and delivered a baby girl at 41 weeks of gestation. The girl showed no physical abnormalities during a seven-month follow-up.

Objective:To summarize the initial experience on da Vinci robot breast surgery (RBS).Methods:The clinical data of 151 patients who underwent RBS-related surgical procedures at the First Affiliated Hospital of Zhengzhou University from Sep 2022 to Jan 2024 were retrospectively analyzed.Results:Forty patients underwent surgery using the da Vinci robot Si TM system, and 137 patients underwent surgery using the da Vinci robot Xi TM system. The postoperative follow-up time was (3±1) month,There was no necrosis of the nipple-areola complex and no serious perioperative complications in the patients except for 3 case of prosthesis loss.Most patients were satisfied with the postoperative aesthetic results. Conclusions:Although the currently available evidence is immature and the follow-up time is short, our preliminary results suggest that RBS provides better cosmetic results and may reduce the risk of nipple necrosis.

Objective:To explore the influencing factors for poor prognosis in patients with severe traumatic brain injury (TBI).Methods:A retrospective analysis was performed; the clinical data of 389 patients with severe TBI admitted to Department of Neurosurgery, 900 th Hospital of PLA Joint Logistics Team from January 2018 to December 2022 were collected. Glasgow Outcome Scale (GOS) was used to evaluate the prognoses 6 months after discharge. Differences in clinical data between the good prognosis group (GOS scores of 4-5) and poor prognosis group (GOS scores of 1-3) were compared. Multivariate Logistic regression was used to analyze the independent influencing factors for poor prognosis in severe TBI patients, and receiver operating characteristic (ROC) curve was used to analyze the predictive value of the regression model in severe TBI patients. Results:At 6 months after discharge, 182 patients (46.8%) had favorable prognosis and 207 patients (53.2%) had unfavorable prognosis. Compared with the good prognosis group, the poor prognosis group had significantly older age, lower Glasgow Coma Scale (GCS) scores, higher proportions of patients with subdural hematoma (SDH), cerebral hernia, cerebral infarction and encephalocele, higher blood glucose, lower albumin, lower K +, Ca 2+ and CO 2, higher international normalized ratio (INR) and C-reactive protein (CRP), lower lymphocyte/monocyte ratio (LMR), and higher neutrophil/lymphocyte ratio (NLR) and systemic immunoinflammatory index (SII, P<0.05). Multivariate Logistic regression analysis showed that age ( OR=1.045, 95% CI: 1.025-1.066, P<0.001), GCS score ( OR=0.487, 95% CI: 0.388-0.612, P<0.001), cerebral hernia ( OR=3.471, 95% CI: 1.604-7.511, P=0.002), blood glucose ( OR=1.109, 95% CI: 1.010-1.218, P=0.030), INR ( OR=8.073, 95% CI: 1.199-54.354, P=0.032) and high SII ( OR=8.311, 95% CI: 4.089-16.892, P<0.001) were independent influencing factors for poor prognosis in severe TBI patients. ROC curve showed that area under the curve of the regression model predicting poor prognosis in severe TBI patients was 0.935 (95% CI: 0.905-0.957, P<0.001), enjoying sensitivity of 88.89% and specificity of 85.16%. Conclusion:Severe TBI patients with advanced age, low GCS score, high INR and SII, elevated blood glucose, or cerebral hernia have poor prognosis.