Background Frailty serves as a significant precursor to falls, disability, and mortality. Epidemiological evidence examining the impact of working hours on frailty remains scarce. Objective To explore the prevalence of frailty and the relationship between frailty and working hours among full-time middle-aged and older workers in China. Methods Data were derived from the 2020 China Health and Retirement Longitudinal Study (CHARLS). The study included full-time workers aged 45 years and above with a weekly working duration exceeding 35 h. Frailty was assessed using the Frailty Index (FI). First, the dose-response relationship between working hours and FI was explored using a generalized additive model (GAM). Second, univariate analyses were performed using t-tests, χ² tests, and the Jonckheere–Terpstra trend test. Restricted cubic splines (RCS) were introduced for modeling. Based on ordinal logistic regression models, covariates were adjusted sequentially to examine whether differences in frailty prevalence existed across different weekly working hour categories. Finally, subgroup analyses were performed. Results Among the 5504 included participants, the mean age was (56.41±7.30) years, with 2304 being female (41.86%). A total of 807 participants (14.66%) were identified as frail, and 2 686 participants (48.80%) were pre-frail. After standardization for gender and age according to the seventh national census data, the standardized prevalence of frailty and prefrailty were 18.89% and 47.25%, respectively. Significant higher proportions of frail individuals were found among those in non-managerial (73.73%), agricultural (64.06%), and non-employed (65.68%) occupations. Long working hours were prevalent: 2596 (47.17%) workers worked 41–60 h per week, 1649 (29.96%) worked >60 h per week, and only 1259 (22.87%) worked 35–40 h per week. GAM analysis showed a non-linear relationship between weekly working hours and FI. Restricted cubic spline analysis showed a statistically significant association between weekly working hours and frailty status (P=0.022). Logistic regression analysis revealed that individuals working more than 60 h per week had a 23% higher odds of frailty compared to those working 41–60 h (OR=1.23, 95%CI: 1.09, 1.38, P<0.01), while those working 35–40 h per week showed a 15% higher odds of frailty (OR=1.15, 95%CI: 1.01, 1.31, P=0.034). The subgroup analysis revealed that the positive association between working more than 60 h per week and frailty remained generally consistent across sex, age, urban/rural residence, occupational attributes, industry, or employment type, although the association did not reach statistical significance among non-rural residents and individuals aged 60 years and older. Conclusion The prevalence of frailty among full-time middle-aged and older labor force in China is relatively high, and the odds of frailty increases significantly among those who work more than 60 h per week. It is recommended to implement frailty prevention and management strategies targeting long-working-hour workers and to prioritize the impact of working duration on frailty.

Background: and Purpose To investigate the association between derivatives of reactive oxygen metabolites (d-ROMs), biological antioxidant potential (BAP) and the risk of stroke by subtype, and ischemic heart disease (IHD). Methods: We employed a case cohort design consisting of cardiovascular disease cases (n=1,521; stroke, n=1,271; IHD, n=265) and a random sub-cohort (n=4,761) in a large Japanese population-based study. d-ROMs and BAP were measured in plasma samples collected between 1995 and 1999. Hazard ratios (HRs) were estimated using weighted Cox proportional hazards methods according to d-ROMs and BAP quartiles, adjusted for age, sex, area, and potential confounding factors. Results: Analysis revealed a positive association between d-ROMs and the risk of total stroke, ischemic stroke, IHD, and the composite outcome of ischemic stroke and IHD. The multivariable HRs and 95% confidence intervals (CIs) for the highest versus lowest quartiles for d-ROMs were 1.34 (95% CI: 1.11–1.63) for total stroke (P for trend<0.001), 1.47 (1.16–1.86) for ischemic stroke (P for trend<0.001), 1.47 (1.02–2.11) for IHD (P for trend=0.072), 1.47 (0.87–2.49) for subarachnoid hemorrhage (P for trend=0.101), and 1.01 (0.72–1.41) for intraparenchymal hemorrhage (P for trend=0.618). In contrast, no significant association was detected between BAP levels and the risk of cardiovascular disease. Conclusions Analysis revealed that d-ROMs levels were positively associated with the risk of ischemic stroke and heart disease but not with hemorrhagic stroke.

To explore the interaction between ASFV capsid protein M1249L and host from the host cellular perspective,M1249L was selected for constructing the bait plasmid(pGBKT7-M1249L)to screen the bone marrow-derived macrophages(BMDMs)cDNA library.After again co-transform and sequence alignment,20 candidate interacting host proteins were screened,such as IL-1β,CTSB and DNAJA3.And then,co-immunoprecipitation assay was performed to verify the interaction be-tween M1249L and host proteins.GO ontology(GO)and KEGG pathway enrichment analyses re-vealed that biological regulation,cellular communication and response to stimulus and others were enriched in biological processes.And these host proteins could share some pathways,including toll-like receptor signaling pathway and Nod-like receptor signaling pathway.Therefore,the results provides the theoretical basis for further research on the mechanism of ASFV M1249L in viral in-fection and immune regulation.

Objective To evaluate the value of risk score model based on clinical and multimodal ultrasound features for differentiating benign and malignant breast imaging reporting and data system(BI-RADS)4A lesions in breast.Methods Totally 177 patients with BI-RADS 4A lesions detected by multimodal breast ultrasound were prospectively enrolled,and the patients were divided into training set(n=123)and test set(n=54)at the ratio of 7∶3.Univariate and multivariate logistic regression analyses were used to analyze patients'clinical,gray-scale ultrasound,CDFI and elastography ultrasound parameters of lesions,and the independent risk factors for differentiating benign and malignant BI-RADS 4A lesions in breast were screened,so as a risk score model was constructed.Based on the results of sungical pathology or follow-up,the cut-off value of the model for differentiating benign and malignant BI-RADS 4A lesions in breast was obtained by receiver operating characteristic(ROC)curve,and the patients were divided into high-risk and low-risk subgroups according to the cut-off value,and the efficacy of the model was evaluated.Results Among 177 cases,39 were with benign lesions and 138 were with malignant lesions.Patients'age＞58 years,diameter of lesion＞15.1 mm,lesions with irregular shape,lesions with grade 1 or 2 of blood flow and standard deviation of sound touch elastography of a 2 mm circular area around the lesion(shell)(shell-STESD)＞16.33 kPa were all independent risk factors of malignant BI-RADS 4A lesions in breast.The cut-off value of risk score model for differential diagnosis was 6.5 points,and its sensitivity was 84.69%(83/98)and specificity was 88.00%(22/25)in distinguishing high-risk and low-risk subgroups in training set,while its sensitivity was 77.50%(31/40)and specificity was 71.43%(10/14)in test set.Conclusion Risk score model based on clinical and multimodal ultrasound features could effectively differentiate benign and malignant BI-RADS 4A lesions in breast.

With the increasing use of nirmatrelvir-ritonavir in older COVID-19 patients, adverse drug reactions due to drug-drug interactions have become more frequent. This report describes a patient who experienced severe bradycardia and hypotension following the concurrent use of heart rate-control medications and nirmatrelvir-ritonavir during an active COVID-19 infection. This suggests that clinicians should be cautious when dealing with nirmatrelvir-ritonavir and try their best to avoid serious adverse reactions.

OBJECTIVE To establish skin contamination models with sulfur mustard analogue 1-chloro-2-ethylsulfanyl ethane(CEES),and evaluate the therapeutic efficacy of reactive skin decontamination lotion kit(RSDL).METHODS ①Kunming,BALB/c,BALB/c-nu,and C57BL/6N were contaminted with CEES 75 μL·kg-1 using exposed method and covered method for 10 min on the dorsal skin.Wound healing times and areas were assessed to determine the stock of mice and exposure method.② BALB/c mice were exposed to a gradient of CEES at the doses of 75,150,250,350 and 500 μL·kg-1(10 min)using the covered method.Wound healing times,areas and Kaplan-Meier survival curves were used to determine the optimal dose.③ BALB/c mice were exposed to CEES 150 μL·kg-1 for varying durations(5,10 and 20 min)using the covered method.Wound healing times,areas and Kaplan-Meier survival curves were analyzed to determine the optimal exposure time.④ BALB/c mice were divided into four groups:control(exposed with the covered method at 150 μL·kg-1,10 min),treatment(20 μL RSDL treatment after exposure,as the control group),5 min treatment(20 μL RSDL treatment after 5 min of exposure,followed by 5 min of coverage)and immediate-treatment(exposed with the exposed method at 150 μL·kg-1,immediately treated with 20 μL RSDL,followed by 10 min of coverage).The therapeutic efficacy was evaluated based on the wound area,subcutaneous microvesicle count,epidermal thick-ness,and inflammatory cytokine(IL-6 and TNF-α)expressions.RESULTS ① The covered method caused more severe and prolonged wounds than the exposed method.BALB/c mice exhibited a high sensitivity to CEES with delayed wound healing and were therefore selected as the model animal.② Survival rates in BALB/c mice dropped below 50%at doses of 250,350 and 500 μL·kg-1,whereas an 83.3%survival rate was observed at 150 μL·kg-1.③ The mice exposed to CEES(150 μL·kg-1,20 min)died within 3 days.The wound area was consistently smaller in the 5 min covered group than in the 10 min covered group.④CEES-induced skin injury led to epidermal nuclear pyknosis,follicular disrup-tion,inflammatory infiltration,and microvesicle formation in both treatment and poisoned control groups.As more immediate treatment,the wound area significantly decreased.While the IL-6 expres-sion showed no significant intergroup difference,the TNF-α expression was significantly higher in the treatment group.CONCLUSION A CEES-induced skin contamination model has been established in BALB/c mice using the covered method(150 μL·kg-1,10 min covered).However,RSDL should be ad-ministered in 10 min post-contamination.

Objective To investigate the effects of a continuous-dose administration versus different dosage regimens of polyethylene glycol electrolyte solution(PEG)taken in two doses with a 12-hour interval on bowel cleansing efficacy,with the goal of optimizing bowel preparation protocols and improving patient tolerability.Methods 232 patients who underwent painless colonoscopy and used PEG as a bowel cleanser from June 2024 to September 2024 were selected as study subjects.Participants were divided into three groups:the control group(3.00 L PEG continuous dose),experimental group A(0.75 L+2.25 L PEG),and experimental group B(1.50 L+1.50 L PEG).All patients underwent painless colonoscopy within 4～6 h after completing PEG intake.The interval between the two doses of PEG in group A and group B was 12 h.The bowel cleansing efficacy was assessed by using the Boston bowel preparation scale(BBPS),and the rates of colon polyp detection,adverse reactions,sleep duration,and tolerability were recorded.Results There were no significant statistical differences in BBPS scores and colon polyp detection rates among the three groups(P>0.05).Experimental group B experienced the least adverse reactions,followed by experimental group A,while the control group reported the most significant adverse reactions(P<0.05).The timing of PEG administration did not have a significant impact on sleep duration among the three groups(P>0.05).Patients in experimental group B showed good tolerability to PEG and were willing to accept this bowel preparation regimen,followed by group A,while the control group exhibited the poorest tolerability,with significant statistical differences among the three groups(P<0.05).Conclusion The continuous administration and divided administration of PEG have no significant impact on the effectiveness of intestinal cleansing and the detection rate of colonic polyps.However,the divided PEG regimen with a 12 h interval results in fewer adverse reactions and better tolerance,especially the optimal regimen of taking 1.50 L PEG in two doses with a 12 h interval.

Objective To sort out the management system of clinical trial drugs in our hospital,and analyze the construction and practical experience of the information system in the whole process management of clinical trial drugs,and to further improve the efficiency and quality of clinical trials.Methods Based on the original management of clinical trial drugs,an information system in line with the situation of our hospital was applied to manage the whole process of clinical trial drugs.Results Compared with the traditional management,the information system can automatically record the data of inbound and outbound storage,distribution,retrieval and return of trial drugs in real time,pre-review the prescriptions and randomized documents of clinical trial drugs,and realise paperless office.Conclusions The information system can ensure the safety,accuracy and traceability of the data of drugs used in clinical trial.The system can also save resources,improve the efficiency and quality of clinical trial management.

The pathological mechanisms and related physiological indicators of acute mountain sickness(AMS)were introduced,and the present situation of wearable devices applied in AMS auxiliary detection and diagnosis were reviewed.The challenges and future development directions of wearable devices applied in auxiliary detection and diagnosis were pointed out.[Chinese Medical Equipment Journal,2025,46(9):100-107]

Objective:To explore the influence of Stat1 on Foxp3 expression and production of Treg.Methods:C57BL/6 mice were used and separated into normal control group and Stat1 specific inhibitor Fludarabine(Flud)treatment group.Ratio of CD4+Foxp3+Treg and expression of Foxp3 in spleen,lymph nodes and peripheral blood of mice in each group were detected by flow cy-tometry.Human Stat1 overexpression plasmid was constructed and transfected into human breast cancer MCF-7 cells,and expression changes of Foxp3 was detected by RT-qPCR and Western blot.Results:Compared with mice in normal control group,proportion of Treg and expression of Foxp3 in lymph nodes and peripheral blood of mice in Flud treatment group were increased,while Stat1 overex-pression resulted in decreased Foxp3 mRNA and protein expression in MCF-7 cells.Conclusion:Stat1 inhibits expression of Foxp3 and production of Tregs.