Objective: To investigate the current status of Toxoplasma gondii (T. gondii) infection among blood donors in Jiangxi Province, thereby providing scientific evidence for ensuring blood transfusion safety. Methods: Serum samples from 1 529 blood donors were tested for T. gondii IgG and IgM antibodies using enzyme-linked immunosorbent assay (ELISA). Positive samples were further analyzed by B1 gene PCR testing and Giemsa staining microscopy. Risk factor data were collected via telephone follow-up. Infection rate differences were analyzed using χ tests. Results: The overall T. gondii infection rate among blood donors was 3.92% (60/1 529), with IgG positivity being predominant (3.86%) and IgM positivity at 0.20%. All antibody-positive samples tested negative for T. gondii DNA. Blood group AB donors had the highest infection rate (7.00%), whereas group O donors had the lowest rate (2.47%), with a statistically significant difference (χ =8.27, P<0.05). The infection rate in the 46-55 age group was higher than that in the 18-25 age group, χ =4 237.75, P<0.05. No significant differences were observed across subgroups stratified by sex, occupation, or education level. Multivariate analysis identified cat/dog ownership (χ =28.23, P<0.05), and frequent consumption of cold dishes (χ =4.09, P<0.05) as key risk factors. Conclusion: In Jiangxi province, T. gondii infection among blood donors is predominantly characterized by past infection, with higher infection rates observed in blood type AB donors and those aged 46-55. The main risk factors include contact with cats/dogs as pets and frequent consumption of cold dishes. It is recommended to disseminate health knowledge on toxoplasmosis prevention in communities and schools to reduce the transfusion transmission risk.

On the pressure resistant clothing,suitcases and bags,a load-bearing zipper is an effective device to keep pressure and fold-unfold the structure.The load-bearing zipper should has a high-strength and moderate operation force.A model of zipper was established and the changing process bearing the breaking strength crosswise of chain was calculated by finite element software Ansys,and the structure sizes were improved according on the fracture mechanism.A kind of high strength zipper was obtained by the continuous molding nylon zipper tooth and the properties were measured.An air pressure bag was made to evaluate the performance in use.Results indicate that the breaking strength crosswise of chain reaches 2000 N/25 mm with a moderate 14.5 N tab pull-off strength,which means the load-bearing zipper could meet the requirements of high strength pressure resistant structures.

The sealing performance is directly related to the safety,reliability and mission success rate of aerospace equipment.The sealing performance of rubber seals and the optimized design of the compression force directly affect the performance and work efficiency of the equipment.Based on the hyperelastic Mooney-Rivlin model of nonlinear materials,the mechanical properties of rubber are simulated,and a finite element model of rubber seals is established.Through simulation analysis,the effects of different cross-section dimensions and compression amounts on the sealing performance are studied and compared,and key parameters such as the contact stress distribution,maximum contact stress,and compression force.The size of the fillet affects the final deformation and the contact state.By optimizing the geometric parameters,the compression force can be reduced while ensuring the sealing performance,providing a theoretical basis for the optimized design of rubber seals.

Objective To analyze the difference of rotator cuff muscle group fat content by MR proton density fat fraction(PDFF)tech-nology,and to explore the correlation between these variations and the severity grading of supraspinatus tendon injury.Methods Ninety-three patients with supraspinatus tendon injury were retrospectively selected and divided into the tendinitis group(grade Ⅰ),the partial tear group(grade Ⅱ),and the complete tear group(grade Ⅲ).The fat fraction(FF)values of the three groups of rotator cuff mus-cle group were measured using the PDFF technology,and the differences in FF values among the rotator cuff muscle group in the three groups were compared.The risk factors of the grading of supraspinatus tendon injury and the correlation between FF values and the severity grading of supraspinatus tendon injury were analyzed.Results The differences in the FF values of the supraspinatus and infraspinatus muscles among the three groups were statistically significant(P＜0.01).The FF values of both the supraspinatus and infraspinatus muscles were identified as significant factors associated with the severity grading of supraspinatus tendon injury.Further-more,the FF values of the supraspinatus and infraspinatus muscles were positively correlated with the severity grading of supraspina-tus tendon injury(r=0.576,P＜0.01;r=0.510,P＜0.01).Conclusion MR PDFF technology can effectively evaluate the extent of fat infiltration in the rotator cuff muscle group after supraspinatus tendon injury.Specifically,the FF values of the supraspinatus and infraspinatus muscles serve as reliable quantitative indicators for classifying supraspinatus tendon injury.

Objective To analyze the difference of rotator cuff muscle group fat content by MR proton density fat fraction(PDFF)tech-nology,and to explore the correlation between these variations and the severity grading of supraspinatus tendon injury.Methods Ninety-three patients with supraspinatus tendon injury were retrospectively selected and divided into the tendinitis group(grade Ⅰ),the partial tear group(grade Ⅱ),and the complete tear group(grade Ⅲ).The fat fraction(FF)values of the three groups of rotator cuff mus-cle group were measured using the PDFF technology,and the differences in FF values among the rotator cuff muscle group in the three groups were compared.The risk factors of the grading of supraspinatus tendon injury and the correlation between FF values and the severity grading of supraspinatus tendon injury were analyzed.Results The differences in the FF values of the supraspinatus and infraspinatus muscles among the three groups were statistically significant(P＜0.01).The FF values of both the supraspinatus and infraspinatus muscles were identified as significant factors associated with the severity grading of supraspinatus tendon injury.Further-more,the FF values of the supraspinatus and infraspinatus muscles were positively correlated with the severity grading of supraspina-tus tendon injury(r=0.576,P＜0.01;r=0.510,P＜0.01).Conclusion MR PDFF technology can effectively evaluate the extent of fat infiltration in the rotator cuff muscle group after supraspinatus tendon injury.Specifically,the FF values of the supraspinatus and infraspinatus muscles serve as reliable quantitative indicators for classifying supraspinatus tendon injury.

Objective:To explore the clinical application value of rapid next-generation sequencing (NGS) strategy based on targeted amplicon sequencing in the diagnosis of myeloid neoplasms.Methods:In this observational study, both rapid NGS and conventional NGS on the bone marrow or peripheral blood samples of 682 patients were prospectively performed from February 2021 to August 2022 in First Affiliated Hospital of Soochow University. The sequencing results were analyzed using the local Ion Reporter software and our lab′s self-built bioinformatics platform, respectively. The timeliness of the two sequencing platforms was compared, and the Kappa consistency test was used to evaluate the consistency between the two sequencing platforms. Patients aged between 18 and 59 years with newly diagnosed acute myeloid leukemia (AML) underwent screening by rapid NGS combining multiplex RT-PCR and in situ fluorescence hybridization technique within 72 hours, from whom high-risk patients according to European LeukemiaNet (ELN) 2017 were screened for individualized induction therapy.Results:In terms of timeliness, the median time from sample receipt to report issuance were 3 (2, 4) days and 13 (11, 15) days under rapid NGS and conventional NGS testing, respectively, with a statistically significant difference ( Z=?22.636, P<0.001). Among 682 specimens with a total of 1 507 variants, rapid NGS detected a total of 1 499 variants, with a detection rate of 99.5% and 674 cases were accurate, with an accuracy rate of 98.8%; the conventional NGS detected 1 506 variants, with a detection rate of 99.9% and 681 cases were accurate, with an accuracy rate of 99.9%. In 682 specimens, there were 181 negative and 501 positive, in which 8 cases were missed under rapid NGS, and 1 case was missed under conventional NGS. The kappa value was 0.967 by Kappa consistency test, and P<0.001, suggesting good consistency and consistency between the two NGS platforms. From February 2021 to July 2022, 286 patients who were rapidly diagnosed of AML contained 78 patients screened as the ELN 2017 adverse-risk category, including 42 patients enrolled, with age 39 (33, 52) years old. After one cycle of venetoclax combined with decitabine induction therapy, 78.6%(38/42) of the patients achieved composite complete remission. Among the rest 104 additional myeloid neoplasms, rapid NGS detected mutations in 80 patients, with a detection rate of 76.9%, among which 89.0%(215/242) of the variants could serve as the basis for the diagnostic classification, prognostic evaluation, and target therapy of myelodysplastic syndromes (MDS), myeloproliferative neoplasms (MPN), and myelodysplastic/myeloproliferative neoplasms (MDS/MPN). Conclusion:The rapid NGS based on targeted amplicon sequencing is in good consistency with conventional NGS, and shorters the diagnostic time, whose sensitivity and detection range meets the need for diagnostic classification, prognostic stratification, and target therapy of myeloid neoplasms.

Objective:To investigate the influence of liver drainage volume on overall survival time in patients with unresectable malignant hilar bile duct obstruction.Methods:Data of 633 patients with unresectable malignant hilar bile duct obstruction (BismuthⅡ-Ⅳ) who underwent endoscopic stent drainage in 3 endoscopy centers from January 2002 to May 2019 were retrospectively analyzed. Main observation indicators included clinical success rate, stent patency, overall survival, the effective liver drainage volume, and complication incidence.Results:The clinical success rates of patients with liver drainage volume <30%, 30%-50%, and >50% were 56.8% (25/44), 77.3% (201/260) and 84.2% (277/329) respectively. The incidences of early cholangitis were 31.8% (14/44), 18.8% (49/260) and 16.1% (53/329). The median stent patency time was 4.5 (95% CI: 1.8-7.2) months, 5.6 (95% CI: 5.0-6.2) months and 6.6 (95% CI: 5.2-8.0) months. The overall survival time was 2.4 (95% CI: 1.8-3.0) months, 4.0 (95% CI: 3.4-4.6) months and 4.9 (95% CI:4.4-5.4) months, respectively. The clinical success rate ( χ 2=8.28, P=0.012), median stent patency period ( χ 2=18.87, P=0.015) and overall survival time ( χ 2=6.93, P=0.024) of 30%-50% liver drainage volume group were significantly higher than those of <30% group. Further multivariate cox regression analysis showed that the disease type (hepatocellular carcinoma VS hilar cholangiocarcinoma: HR=1.50, 95% CI:1.18-1.91, P=0.001; gallbladder carcinoma VS hilar cholangiocarcinoma: HR=1.45, 95% CI:1.14-1.85, P=0.002; metastatic cholangiocarcinoma VS hilar cholangiocarcinoma: HR=1.48, 95% CI:1.08-2.04, P=0.015), bilirubin level >200 μmol/L ( HR=1.35, 95% CI:1.14-1.60, P<0.001),metal stents ( HR=0.67, 95% CI:0.56-0.79, P<0.001), liver drainage volume (volume 30%-50% VS <30%: HR=0.64, 95% CI: 0.45-0.90, P=0.010; volume>50% VS <30%: HR=0.58, 95% CI:0.41-0.81, P=0.002) and anti-tumor therapy ( HR=0.51, 95% CI:0.42-0.61, P<0.001) were independent predictors for overall survival time of patients with unresectable malignant hilar bile duct obstruction. Conclusion:When endoscopic stent drainage is performed for patients with unresectable malignant hilar bile duct obstruction, at least 30% liver volume is required for better overall survival. In addition, the use of metal stent drainage and anti-tumor therapy may increase survival benefits.

Objective:To investigate the risk factors for moderate to severe pancreatitis (PEP) after endoscopic retrograde cholangiopancreatography (ERCP) .Methods:Data of 6 731 patients diagnosed as having biliary and pancreatic diseases with initial papilla who underwent endoscopic retrograde cholangiopancreatography (ERCP) from June 2010 to June 2020 in the First Affiliated Hospital of Air Force Medical University were retrospectively analyzed. Parameters related to intubation and postoperative complications were prospectively collected. The main end point was moderate to severe PEP. Logistic regression analysis was used to explore the risk factors for moderate to severe PEP.Results:The incidence of overall PEP and moderate to severe PEP in 6 731 ERCP patients with initial papilla were 5.3% ( n=359) and 1.0% ( n=68) respectively. Univariate analysis showed that female, indications of ERCP, cannulation method, cannulation time, cannulation attempts, times of inadvertent pancreatic duct cannulation and cannulation with or without trainee involvement were all associated with moderate to severe PEP ( P<0.10). Multivariate analysis showed that female ( OR=2.32, 95% CI:1.28-4.21, P=0.006), non-common bile duct stones indication ( OR=2.04, 95% CI:1.16-3.59, P=0.014), cannulation time ≥5 min ( OR=2.23, 95% CI: 1.20-4.13, P=0.011), inadvertent pancreatic duct cannulation time ≥1 ( OR=1.88, 95% CI: 1.03-3.44, P=0.040) and non-trainee involvement cannulation ( OR=1.81, 95% CI: 1.02-3.22, P=0.043) were independent risk factors for moderate to severe PEP. Conclusion:The independent risk factors for moderate to severe PEP include female, non-common bile duct stones indication, non-trainee involvement cannulation and difficult cannulation. Great importance should be attached to these factors above during the whole perioperative period of ERCP.

Objective:To investigate the application value of different metal stents place-ment position in endoscopic drainage of malignant hilar bile duct obstruction.Methods:The retro-spective cohort study was conducted. The clinicopathological data of 300 patients with malignant hilar bile duct obstruction who were admitted to 3 medical centers, including 216 patients in the Third Affiliated Hospital of Naval Medical University, 48 patients in the Xijing Hospital of Air Force Medical University, 36 patients in the First People's Hospital Affiliated to Shanghai Jiaotong University School of Medicine, from January 2012 to January 2019 were collected. There were 164 males and 136 females, aged (67±12)years. All patients were determined to be unresectable by multidisciplinary consultation and underwent endoscopic retrograde cholangiopancreatography. Observation indicators: (1) clinicopathological features of patients; (2) follow-up; (3) analysis of influencing factors for patency time of metal biliary stents and overall survival time of patients. Follow-up was conducted using outpatient examination and telephone interview to detect patency of metal biliary stents and survival of patients up to July 2019 or death of patients. Measurement data with normal distribution were represented as Mean± SD, and comparison between groups was conducted using the independent sample t test. Measurement data with skewed distribution were represented as M( Q1, Q3), and comparison between groups was conducted using the Mann-Whitney U test. Count data were expressed as absolute numbers or percentages, and comparison between groups was conducted using the chi-square test or Fisher exact probability. Comparison of ordinal data was conducted using the rank sum test. Kaplan-Meier method was used to calculate survival rates and draw survival curves, and Log-Rank test was used to conduct survival analysis. COX regression model was used for univariate and multivariate analyses. Factors with P<0.1 in univariate analysis were included in multivariate analysis. Results:(1) Clinicopathological features of patients. Of the 300 patients, 163 cases underwent endoscopic drainage with at least one metal biliary stent' distal portion crossing the duodenal main papilla (hereinafter referred to as crossing papilla), and 137 cases underwent endoscopic drainage with no metal biliary stent' distal portion crossing the duodenal main papilla (hereinafter referred to as no crossing papilla). Age, disease type (hilar cholangiocarcinoma, hepatocellular carcinoma, intrahepatic cholangio-carcinoma, gallbladder carcinoma, metastatic cholangiocarcinoma), metal biliary stents type (unilateral metal biliary stent, bilateral metal biliary stents) of patients with crossing papilla were (68±13)years, 95, 8, 11, 31, 18, 63, 100, respectively. The above indicators of patients with no crossing papilla were (64±12)years, 63, 22, 20, 23, 9, 126, 11, respectively. There were significant differences in the above indicators between patients with crossing papilla and patients with no crossing papilla ( t=2.70, χ2=17.69, 90.79, P<0.05). (2) Follow-up. All the 300 patients were followed up for 5.4(3.1,9.3)months. The patency time of metal biliary stents was 9.0(8.2,9.8)months and 6.4(4.8,8.0)months of patients with crossing papilla and patients with no crossing papilla, showing a significant difference between them ( χ2=8.23, P<0.05). The overall survival time was 5.5(4.2,6.8)months and 5.5(4.3,6.8)months of patients with crossing papilla and patients with no crossing papilla, showing no significant difference between them ( χ2=0.28, P>0.05). (3) Analysis of influencing factors for patency time of metal biliary stents and overall survival time of patients. Results of univariate analysis showed that type of metal biliary stents and the placement position of metal biliary stents were related factors affecting the patency time of metal biliary stents [ hazard ratio( HR)=0.44, 0.60, 95% confidence intervals as 0.30?0.64, 0.42?0.85, P<0.05]. Results of multi-variate analysis showed that bilateral metal biliary stents was an independent protective factor for the patency time of metal biliary stents ( HR=0.46, 95% confidence interval as 0.29?0.72, P<0.05). Results of univariate analysis showed that disease type (intrahepatic cholangiocarcinoma versus hilar cholangiocarcinoma), preoperative serum total bilirubin, type of metal biliary stents, anti-tumor therapy were related factors affecting the overall survival time of patients ( HR=1.05, 1.43, 0.72, 0.61, 95% confidence intervals as 0.70?1.57, 1.12?1.83, 0.55?0.92, 0.47?0.81, P<0.05). Results of multi-variate analysis showed that age >60 years, disease type as hepatocellular carcinoma, preoperative serum total bilirubin >200 μmol/L were independent risk factors for the overall survival time of patients ( HR=1.35, 1.98, 1.46, 95% confidence intervals as 1.02?1.79, 1.40?2.80, 1.13?1.89, P<0.05), and bilateral metal biliary stents, anti-tumor therapy were independent protective factors for the overall survival time of patients ( HR=0.68, 0.60, 95% confidence intervals as 0.53?0.89, 0.45?0.80, P<0.05). Conclusions:Endoscopic drainage with or without metal biliary stents' distal portion crossing the duodenal main papilla is safe and feasible for patients with malignant hilar bile duct obstruction. Bilateral metal biliary stents is an independent protective factor for the patency time of metal biliary stents. Age >60 years, disease type as hepatocellular carcinoma, preoperative serum total bilirubin >200 μmol/L are independent risk factors for the overall survival time of patients, and bilateral metal biliary stents, anti-tumor therapy are independent protective factors for the overall survival time of patients.

Objective:To investigate the outcome and prognostic factors associated with endoscopic retrograde cholangiopancreatography (ERCP) in patients with primary sclerosing cholangitis (PSC).Methods:PSC patients admitted to Xijing Hospital from May 2009 to May 2020 were included. Data of demographics, clinical symptoms, laboratory and imaging tests, and ERCP consultations were collected to explore the population characteristics and clinical efficacy of ERCP treatment, and to follow up disease progression, transplant-free survival, and overall survival .Results:A total of 74 patients with PSC were included in this study, with a median age of 53 years, 54.1% (40/74) male. Patients combined with bile duct dominant stenosis, inflammatory bowel disease (IBD), and another autoimmune liver disease were 32.4% (24/74), 18.9% (14/74), and 17.6% (13/74), respectively, and those undergoing ERCP were 36.5% (27/74). Logistic regression analysis showed that high total bilirubin ( OR=12.33, 95% CI: 1.24-122.63, P=0.032) and bile duct dominant stenosis ( OR=24.67, 95% CI: 3.40-178.88, P=0.002) were independent high-risk factors for ERCP consultation. The operation and clinical success rates of ERCP were both 96.3% (26/27). As of the last follow-up, the proportions of patients progressing to cirrhosis, bile duct cancer, liver transplantation and death were 9.5% (7/74), 4.1% (3/74), 5.4% (4/74) and 18.9% (14/74), respectively. The five-year survival rate of the follow-up patients ( n=54) was 83.3%. The differences in transplant-free survival ( P=0.933) and overall survival ( P=0.608) between ERCP patients and non-ERCP patients were not statistically significant. Transplant-free survival of those who were companied with pruritus ( HR=5.30, 95% CI: 1.50-18.90, P=0.010) was shorter. Conclusion:PSC patients have higher proportion of IBD and less autoimmune liver disease. Higher proportion of patients with higher total bilirubin or bile duct dominant stenosis receive ERCP. While the short-term efficacy of ERCP is satisfactory, the long-term prognosis is still suboptimal. Patients with pruritus have a shorter transplant-free survival.