Objective: To investigate the incidence, characteristics, and influencing factors of resolution discrepancies within the minipool (MP) testing model across Chinese blood station laboratories in 2024. Methods: A nationwide, multicenter, cross-sectional study was conducted, including 334 blood station laboratories that reported nucleic acid reactive data among enzyme immunoassay non-reactive samples. Of these, 296 laboratories adopted the pool resolution model, with a total of 12 536 273 samples tested. Systematic analysis was performed on resolution data, focusing on the MP-NAT reactivity rate, the pool resolution concordance rate, and the resolution discrepancy rate. Subgroup analyses were conducted based on reagent types, viral targets, and Ct values. Potential causes were further explored through laboratory surveys and re-examination of raw amplification curves. Results: In 2024, the national average MP-NAT reactivity rate was 0.15%. The overall pool resolution concordance rate was 57.86%, which showed a gradual decline as Ct values increased across all reagents. The national average resolution discrepancy rate was 0.081‱(102/12 536 273), with 17.91%(53/296) of laboratories reporting at least one discrepancy. Nine reagent types were associated with these events, exhibiting reagent-specific patterns. For Reagent A2, the predominant discrepancy was HBV reactive pools resolving as HIV (36.36%); for Reagent D1, HBV pools frequently resolved as HCV (38.89%); and for Reagent E, the most common pattern was HIV pools resolving as HBV (48.00%). These resolution discrepancies were strongly associated with high Ct values: the median pool Ct for HBV exceeded 38, while those for HCV and HIV both exceeded 40. Investigations across 16 laboratories revealed that most discrepant samples exhibited “tailing” amplification curves, with some cases linked to cross-contamination or reagent batch-specific issues. Conclusion: While the incidence of resolution discrepancies in the MP-NAT model remains low in China, variations exist across different reagents and laboratories. These discrepancies are closely associated with low viral load, reagent performance, and laboratory operational practices.

Median arcuate ligament compression syndrome (MALS) presents with atypical clinical manifestations. MALS is rarely reported in pediatric patients but is recognized as an independent risk factor for postoperative hepatic artery thrombosis in liver transplant recipients. We report a case of a pediatric liver transplant recipient with hepatolenticular degeneration, cirrhosis, and acute liver failure. Despite undergoing artificial liver support therapy, the patient showed no significant improvement in liver function and subsequently underwent liver transplantation. Intraoperatively, weak arterial pulsation and the absence of a pulsatile waveform in the hepatic artery anastomosis raised suspicion of MALS. The condition was successfully managed by releasing and transecting the median arcuate ligament, along with ligation of the splenic and left gastric arteries. To optimize transplantation outcomes, meticulous preoperative imaging assessment, particularly focusing on characteristic findings in CT angiography, is essential. Additionally, individualized surgical planning and intraoperative adjustments based on ultrasound monitoring and arterial pulsation assessments are critical for ensuring successful transplantation.

To establish a method for detecting Toxoplasma gondii based on recombinant polymerase amplification(RPA)technology and apply it to clinical sample validation of pet cats.Using the 529 repeat sequence of the Toxoplasma gondii gene as the target gene sequence,primers and probes were designed,and the Rep-529 recombinant plasmid was constructed as the standard.A fluorescent RPA reaction system was established.Dilute the plasmid standard 10 times to different concentrations as the detection template for sensitivity testing;Specific testing was conducted using genomic DNA from several parasitic spe-cies,including Toxoplasma gondii,Cryptosporidium,Neosporidium,Trichinella spiralis,Giardia flagellata,Babesia bo-vis and Theileria annulata as templates;Simultaneously,fluorescence RPA and RT-PCR were used to detect 52 positive and 40 negative cats clinical samples,and the coincidence rate of the detection results of the two methods were compared and ana-lyzed.The RPA reaction system was successfully established using PTRep recombinant plasmid as the standard,ToxD-F/ToxD-R as the primer,and RepD-P as the fluorescent probe.The reaction temperature was constant at 39 ℃,the reaction time was 30 minutes,and the detection sensitivity was 1 copy/μL.There is no significant cross reaction with parasites such as Cryptosporidium,Neosporidium,Trichinella spiralis,Giardia,Babesia bovis and Theileria annulata,and the specificity is good.A total of 92 clinical fecal samples from cats were tested,and the positive coincidence rate of fluorescence RPA detection method was higher than that of conventional RT-PCR method(98.08％vs.82.69％),and the difference of the positive rate was not statistically significant(X2=1.392,P＞0.05).The fluorescence RPA detection method for Toxoplasma gondii suc-cessfully established in this study has the characteristics of being fast,sensitive,specific,accurate,and reliable.It can be used as a rapid clinical detection kit for Toxoplasma gondii in cats and other animals,providing new technical support for the subsequent epidemiological monitoring and precise clinical diagnosis of toxoplasmosis in cats,other animals,and humans in the future.

Objective: To investigate the prevalence of Dengue virus (DENV) infection among voluntary blood donors in Xishuangbanna Dai Autonomous Prefecture, and to evaluate the necessity of implementing nucleic acid testing (NAT) for blood donors during the rainy season (May-October). Methods: Prior to initiating donor screening, the Xishuangbanna Central Blood Center conducted in-house validation of reagent performance and participated in external quality assessment (EQA) organized by the National Center for Clinical Laboratories (NCCL). During the surveillance period (August-October 2024), a total of 2 919 donor samples were screened using a 6-sample mini-pool NAT strategy. Daily internal quality controls were recorded. Samples that tested positive in pooled screening were deconvoluted and retested in duplicate; only those reactive in both replicate wells were sent to the NCCL for confirmatory testing. At NCCL, samples underwent re-testing using five domestic NAT reagents, as well as serological assays for NS1 antigen and DENV-specific IgG/IgM. Confirmed positive samples were further characterized by serotyping, envelope (E) gene sequencing, and phylogenetic analysis using the maximum likelihood method. Results: The DENV NAT reagent demonstrated consistent detection of 40 copies/mL controls in individual donor (ID)-NAT test (mean CT: 35.61±0.40). During the 63-day quality control monitoring, DENV detection remained stable (mean CT: 22.53±0.72). The center achieved full marks in EQA assessments for 2023 and 2024. Three reactive pools were identified in initial screening, and subsequent individual testing confirmed three DENV RNA-positive donors (sample numbers: 2401, 2402, and 2403). The confirmatory test results from NCCL were: all five NAT platforms consistently detected DENV RNA in the three samples; for serological tests, 2 samples (2402, 2403) were positive for NS1 antigen, while all three samples were negative for both IgG and IgM antibodies. DENV serotyping reagents identified DENV-2 in all cases, which were further confirmed as DENV-2 Genotype Ⅱ-Cosmopolitan by E gene sequencing. Phylogenetic analysis indicated that samples 2401 and 2402 clustered with Southeast Asian strains (Thailand/MZ636802.1, Laos/PQ775621.1), while sample 2403 closely matched a previously reported local Yunnan strain (PV544686.1). Conclusion: DENV-2 infection was detected among blood donors in Xishuangbanna during the rainy season, indicating concurrent risks of imported and local transmission. We recommend implementing pooled NAT screening for blood donors in high-risk areas during dengue epidemic seasons, along with strengthened laboratory quality control, to enhance blood safety.

Forensic medicine has been designated as a first-level discipline,presenting new opportunities and challenges for the development of forensic medicine.Since the 1980s,the establishment of foren-sic medicine discipline and the cultivation of high-level forensic talents have become hot topics in the development of forensic medicine in China.Since the 13th Five-Year Plan,the forensic team of Shanxi Medical University has been aiming at the forefront,proposing the development goals of"Five First-class"and the discipline development path"Six Major Achievements".It has selected benchmark disci-plines,identified gaps in disciplinary development,unified thoughts,formulated completion timelines,concentrated superior resources,assigned tasks to individuals,and created an"Organized Fill-in-the-Blank Format"forensic medicine discipline construction model with the characteristics of the new era.The construction model of forensic medicine has achieved good results in the goals,discipline frame-work,scientific research,talent cultivation,discipline team and platform construction,forming a rela-tively complete discipline construction and management system,and accumulating valuable experience for the construction of first-level discipline and high-level talent cultivation of forensic medicine.

Objective:To explore the association between serum magnesium levels during catheterization in peritoneal dialysis (PD) patients and the failure of PD technology.Methods:It was a retrospective study. The baseline data, laboratory tests and clinical events of inpatients with end-stage renal disease aged ≥18 years who received PD catheterization for the first time from April 1, 2005 to February 29, 2024 were collected, and the follow-up was conducted until June 1, 2024. PD technique failure was defined as extubation for conversion to hemodialysis or patient death. The optimal cut-off value of serum magnesium (0.782 mmol/L) was determined based on the Youden index of the receiver operating characteristic curve for predicting the failure of PD technology. The patients were divided into high serum magnesium group and low serum magnesium group, and differences of baseline clinical data and follow-up outcomes between the two groups were compared. Kaplan-Meier method was used to compare the differences of PD technical survival rates between the two groups. Logistic regression model was used to analyze the related factors of baseline increased serum magnesium levels (0.785 mmol/L) in PD patients. Cox proportional hazards regression model was used to analyze the risk factors for the failure of PD technology.Results:A total of 706 PD patients were included in this study, with age of 43.89 (33.43, 53.70) years. Among them, 339 (48.02%) patients were male. The serum creatinine was (800.45±238.81) μmol/L. The follow-up time was 726.00 (216.00, 1 344.00) days. The incidence of peritonitis was 0.072 times per patient-year, and the failure rate of PD technique was 15.58% (110/706). There were 551 patients (78.05%) in the high serum magnesium group and 155 patients (21.95%) in the low serum magnesium group. Compared with the high serum magnesium group, the low serum magnesium group had significantly lower levels of serum creatinine ( t=-2.743, P=0.006), blood urea nitrogen ( t=-2.428, P=0.004), serum uric acid ( t=-2.346, P=0.005), red blood cell count ( t=-4.100, P<0.001), hemoglobin ( Z=-4.195, P<0.001), serum albumin ( t=-4.400, P<0.001), platelet count ( Z=-2.428, P=0.015), platelet-to-monocyte ratio ( Z=-2.541, P=0.011), serum calcium ( t=-7.463, P<0.001), serum phosphorus ( t=-3.052, P=0.001), prothrombin activity ( t=-3.052, P=0.005) and proportion of hyperphosphatemia ( χ2=6.924, P=0.009), and higher male proportion ( χ2=8.984, P=0.030), proportion of conversion to hemodialysis ( χ2=6.098, P=0.014), neutrophil percentage-to-albumin ratio ( Z=2.875, P=0.004), serum chloride ( Z=4.011, P<0.001), alkaline phosphatase ( Z=2.850, P=0.040), D-dimer ( Z=3.166, P=0.002), proportion of hypoalbuminemia ( χ2=7.543, P=0.006), and proportion of hypocalcemia ( χ2=39.836, P<0.001). Kaplan-Meier survival analysis showed that the PD technical survival rates in the peritonitis group and the low serum magnesium group were significantly lower than those in the control group and the high serum magnesium group, respectively (Log-rank test, χ2=9.332, P=0.002; χ2=7.856, P=0.005). Multivariate logistic regression analysis showed that the serum calcium ( OR=23.237, 95% CI 3.807-141.845) and serum chlorine level ( OR=0.919, 95% CI 0.858-0.985) were independently correlated with the increased serum magnesium. Multivariate Cox regression analysis showed that elevated baseline serum magnesium was an independent protective factor of PD technique failure ( HR=0.351, 95% CI 0.188-0.653). Conclusions:Elevated serum magnesium is an independent protective factor of PD technology failure. Maintaining an appropriate serum magnesium level may improve the prognosis of PD patients.

Objective:To investigate the treatment regimens, therapeutic effects, and adverse events of immune checkpoint inhibitors (ICI) in the treatment of progressive multifocal leukoencephalopathy (PML).Methods:A retrospective analysis was performed on patients with PML who received ICI treatment at the Department of Neurology of Peking Union Medical College Hospital from October 2020 to September 2024. The patients′ demographic characteristics, baseline immune status, clinical manifestations, laboratory tests, treatment regimens, and clinical outcomes were analyzed.Results:A total of 2 male patients with PML, aged 40 and 59 years, received ICI treatment. One patient had underlying combined immunodeficiency, while the other had acute myeloid leukemia subtype M2 and had previously undergone umbilical cord blood stem cell transplantation. Both patients were treated with pembrolizumab (dosage range: 2-3 mg/kg, administered every 3-4 weeks), receiving a total of 2-4 courses of treatment. In terms of therapeutic effects, both patients showed significant improvement. Regarding adverse events, 1 patient experienced immune-related adverse event (irAE) of immune-related pneumonia combined with immune-related hypophysitis.Conclusions:ICI may be an effective treatment option for PML. However, the use of ICI may be accompanied by the occurrence of irAE, necessitating close monitoring during treatment.

Objective:To investigate the features of peripheral blood lymphocyte subsets in children with sepsis and evaluate the value of these cells in combination with multiple indicators in the diagnosis of pediatric sepsis.Methods:A retrospective study was conducted on 86 sepsis children and 83 children with local infection admitted to Hebei Children′s Hospital from October 2022 to October 2024. Baseline clinical data, peripheral blood lymphocyte subsets, and other laboratory indicators were compared between the two groups. The least absolute shrinkage and selection operator (LASSO) regression and multivariate logistic regression were used to evaluate the independent risk factors correlated with the initiation of sepsis. The receiver operating characteristic (ROC) curve was plotted to evaluate the value of each independent risk factor for diagnosing sepsis.Results:The thrombin time, the absolute counts of NK, CD3 + T, CD4 + T, and CD8 + T cells, the levels of IgG and IgM, and the counts of lymphocytes and platelets were lower in the sepsis children than in the children with local infection. However, the prothrombin time (PT), activated partial thromboplastin time, the levels of fibrinogen, direct bilirubin, and C-reactive protein (CRP) were higher in the sepsis group (all P<0.05). The variables screened by LASSO regression were analyzed by the multivariate logistic regression, and the results showed that PT, absolute CD4 + T cell count, and the levels of IgM and CRP were independent risk factors for sepsis. The ROC analysis indicated that the area under the ROC curve (AUC) for PT, absolute CD4 + T cell count, and IgM and CRP levels when used individually in diagnosing sepsis was 0.729, 0.593, 0.605, and 0.795, respectively. The AUC for the four indexes when used in combination for diagnosing sepsis reached 0.822, showing greater superiority over that of the single index. Conclusions:The combined measurement of PT, absolute CD4 + T cell count, and the levels of IgM and CRP can improve the diagnostic efficacy for sepsis in children. Early monitoring of these indexes facilitates the assessment of the condition in children suffering from sepsis.

Objective:To explore the diagnostic value of gradient characteristics of quantitative parameters of contrast-enhanced ultrasound (CEUS) in papillary thyroid carcinoma.Methods:A retrospective case series study was conducted. The clinical data of 120 patients with thyroid diseases who underwent pathological examination for samples collected through fine needle aspiration or surgical resection and underwent CEUS examination before surgery at Shanxi Province Cancer Hospital from January 2018 to May 2023 were collected. A total of 120 thyroid nodules were selected and divided into the benign group (37 nodules) and the malignant group (83 nodules) according to pathological results. The VueBox software was used to depict the four regions of interest in nodules of the two groups, which were the overall, central and marginal areas and surrounding normal thyroid tissues. The time-intensity curve (TIC) was drawn and the relevant parameters including peak enhancement (PE), wash-in area under the curve (WiAUC), wash-in rate (WiR), wash-out rate (WoR), and time to increase (TI) were analyzed, and the gradient values (ΔPE within the nodules, ΔWiAUC within the nodules, ΔWiR within the nodules, ΔWoR within the nodules, ΔTI within the nodules) between two groups of nodules and surrounding normal tissues, as well as between the central and marginal areas of the nodules were calculated.Results:The conventional ultrasound characteristics of benign and malignant nodules showed only a statistically significant difference in aspect ratio ( χ2 = 14.76, P < 0.001). There were statistically significant differences in PE, WiAUC, WiR, and WoR between the overall malignant nodules and the surrounding normal tissues, as well as between the central and marginal areas within the nodules (all P < 0.05); there was a statistically significant difference in WiAUC between the overall benign nodules and the surrounding normal tissues (7 362.06 vs. 7 281.16, Z = -2.07, P = 0.038); there was no statistically significant difference in TI between the two groups of overall nodules and the surrounding normal tissues, as well as the central and marginal areas within the nodules (both P > 0.05); there were statistically significant differences in ΔPE, ΔWiAUC, ΔWiR, and ΔWoR in different regions of the nodules between the two groups (all P < 0.05); binary logistic analysis showed that overall ΔPE and intra nodule ΔWoR were independent predictive factors for the malignancy of thyroid nodules (both P < 0.05); receiver operating characteristic (ROC) curve analysis showed that the overall ΔPE had better diagnostic efficacy for benign and malignant thyroid nodules than the intra nodule ΔWoR, with a cut-off value of -536.23 a.u. Its combination with CEUS had the highest diagnostic efficacy for malignant thyroid nodules, with sensitivity, specificity, positive predictive value, and negative predictive value of 86.7%, 81.1%, 91.1%, and 73.2%, respectively. Conclusions:The peak intensity gradient value (overall ΔPE) between thyroid nodules and surrounding normal tissues can serve as an effective indicator for distinguishing between benign and malignant thyroid nodules. The combination of overall ΔPE and CEUS has good diagnostic efficacy.

Aim To investigate the preventive and therapeutic effect of crocetin(Cro)on acute intestinal injury induced by radiation(RT)and its related mech-anism.Methods Forty mice were randomly divided into four groups:control group,radiation group(RT group),low-dose Cro intervention group(RT+Low-dose Cro group)and high-dose Cro intervention group(RT+High-dose Cro group).The RT group was given a single dose of 12Gy radiation to the abdomen.The Cro intervention group was treated with 25 mg·kg-1 and 100 mg·kg-1 Cro by gavage once a day before ra-diation until seven days after radiation.The mice in each group were weighed.The morphology of intestinal tissue was observed by HE staining.The levels of in-testinal inflammatory factors and oxidative stress were detected.The expressions of Lgr5,Ki67,lysozyme,ZO-1 and Occludin in small intestine tissuewere detected by immunohistochemistry.The expressions of Nrf2/HO-1 and NF-κB signaling related proteinswere detected by Western blot.Results Compared to the control group,mice in the RT group exhibited a significant decrease in body weight(P＜0.01).Additionally,they dis-played evident morphological damage to the small in-testine and elevated levels of pro-inflammatory factors(TNF-α,IL-6)as well as oxidative stress markers(in-creased ROS and MDA levels,decreased GSH and SOD activities)(P＜0.01).Moreover,there was an in-crease in Lgr5 and Ki67 positive cells within the crypts(P＜0.01).The expressions of Occludin,lysozyme,ZO-1,and HO-1 were reduced in small intestine while Nrf2,p-p65,and p-IκB expressions increased(P＜0.01).The improvements in the Cro group were sig-nificantly greater than the RT group(P＜0.01),with a more pronounced effect observed in the high-dose group.Conclusions Cro has a preventive and thera-peutic effect on radiation-induced intestinal injury,and its mechanism is related to anti-inflammation,anti-oxi-dation,improvement of intestinal barrier function,pro-motion of intestinal stem cell regeneration,enhance-ment of Nrf2/HO-1 signaling and reduction of NF-κB signaling activity.