OBJECTIVE: To evaluate the effect of biodegradable magnesium alloy materials in promoting tendon-bone healing during rotator cuff tear repair and to investigate their potential underlying biological mechanisms. METHODS: Forty-eight 8-week-old Sprague Dawley rats were taken and randomly divided into groups A, B, and C. Rotator cuff tear models were created and repaired using magnesium alloy sutures in group A and Vicryl Plus 4-0 absorbable sutures in group B, while only subcutaneous incisions and sutures were performed in group C. Organ samples of groups A and B were taken for HE staining at 1 and 2 weeks after operation to evaluate the safety of magnesium alloy, and specimens from the supraspinatus tendon and proximal humerus were harvested at 2, 4, 8, and 12 weeks after operation. The specimens were observed macroscopically at 4 and 12 weeks after operation. Biomechanical tests were performed at 4, 8, and 12 weeks to test the ultimate load and stiffness of the healing sites in groups A and B. At 2, 4, and 12 weeks, the specimens were subjected to the following tests: Micro-CT to evaluate the formation of bone tunnels in groups A and B, HE staining and Masson staining to observe the regeneration of fibrocartilage at the tendon-bone interface after decalcification and sectioning, and Goldner trichrome staining to evaluate the calcification. Immunohistochemical staining was performed to detect the expressions of angiogenic factors, including vascular endothelial growth factor (VEGF) and bone morphogenetic protein 2 (BMP-2), as well as osteogenic factors at the tendon-bone interface. Additionally, immunofluorescence staining was used to examine the expressions of Arginase 1 and Integrin beta-2 to assess M1 and M2 macrophage polarization at the tendon-bone interface. The role of the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT) signaling pathway in tendon-bone healing was further analyzed using real-time fluorescence quantitative PCR. RESULTS: Analysis of visceral sections revealed that magnesium ions released during the degradation of magnesium alloys did not cause significant toxic effects on organs such as the heart, liver, spleen, lungs, and kidneys, indicating good biosafety. Histological analysis further demonstrated that fibrocartilage regeneration at the tendon-bone interface in group A occurred earlier, and the amount of fibrocartilage was significantly greater compared to group B, suggesting a positive effect of magnesium alloy material on tendon-bone interface repair. Additionally, Micro-CT analysis results revealed that bone tunnel formation occurred more rapidly in group A compared to group B, further supporting the beneficial effect of magnesium alloy on bone healing. Biomechanical testing showed that the ultimate load in group A was consistently higher than in group B, and the stiffness of group A was also greater than that of group B at 4 weeks, indicating stronger tissue-carrying capacity following tendon-bone interface repair and highlighting the potential of magnesium alloy in enhancing tendon-bone healing. Immunohistochemical staining results indicated that the expressions of VEGF and BMP-2 were significantly upregulated during the early stages of healing, suggesting that magnesium alloy effectively promoted angiogenesis and bone formation, thereby accelerating the tendon-bone healing process. Immunofluorescence staining further revealed that magnesium ions exerted significant anti-inflammatory effects by regulating macrophage polarization, promoting their shift toward the M2 phenotype. Real-time fluorescence quantitative PCR results demonstrated that magnesium ions could facilitate tendon-bone healing by modulating the PI3K/AKT signaling pathway. CONCLUSION Biodegradable magnesium alloy material accelerated fibrocartilage regeneration and calcification at the tendon-bone interface in rat rotator cuff tear repair by regulating the PI3K/AKT signaling pathway, thereby significantly enhancing tendon-bone healing.
Animals ; Rotator Cuff Injuries/metabolism* ; Rats, Sprague-Dawley ; Signal Transduction ; Wound Healing/drug effects* ; Alloys/pharmacology* ; Rats ; Proto-Oncogene Proteins c-akt/metabolism* ; Rotator Cuff/metabolism* ; Macrophages/metabolism* ; Magnesium/pharmacology* ; Phosphatidylinositol 3-Kinases/metabolism* ; Vascular Endothelial Growth Factor A/metabolism* ; Male ; Biocompatible Materials ; Bone Morphogenetic Protein 2/metabolism*

ObjectiveTo systematically compare the chemical compositional differences between Puerariae Thomsonii stem base（PTSB） and Puerariae Thomsonii Radix（PTR）， and to explore the potential hepatoprotective effects of PTSB by liver metabolomics. MethodUltra performance liquid chromatography-quadrupole-time-of-flight mass spectrometry（UPLC-Q-TOF-MS/MS） was used to analyze the chemical compositions of PTSB and PTR. Twenty Kunming mice aged 6-8 weeks， half male and half female， were randomly divided into the blank group（sterile water） and PTSB group（1.95 g·kg^-1）， with 10 mice in each group， and the drug was administered by gavage for 14 d， and the body mass was weighed once a day. After the last administration， mice were anesthetized， organs such as heart， liver， spleen， lungs and kidneys were collected， and the organ index was calculated. Enzyme-linked immunosorbent assay（ELISA） was used to measure the levels of aspartate aminotransferase（AST）， alanine aminotransferase（ALT）， total cholesterol（TC） and triglyceride（TG） in the serum of mice from each group， the morphological changes of heart， liver， spleen， lung and kidney tissues were observed by hematoxylin-eosin（HE） staining， and the regulation of PTSB for the hepatic metabolic profiles of mice was analyzed by UPLC-Q-TOF-MS/MS， then the differential metabolites between the blank group and PTSB group were designated， and the metabolic pathways was enriched by Kyoto Encyclopedia of Genes and Genomes（KEGG）. ResultA total of 19 common chemical constituents were identified from PTSB and PTR， all of which were the main pharmacodynamic substances of PTR. The pharmacodynamic results showed that PTSB could control the growth of body mass of mice and reduce the contents of TC， TG， ALT and AST in serum of mice. HE staining observations and organ indexes showed that there was no significant effect of PTSB on all major organs at the highest clinically equivalent dose. A total of 38 differential metabolites were identified by metabolomics， of which 35 were up-regulated and 3 were down-regulated. These differential metabolites were mainly compounds such as amino acids， fatty acids， vitamins， steroids， nucleosides， pyrimidines and alkaloids. Three key metabolic pathways， including tyrosine metabolism， vitamin B₆ metabolism and tryptophan metabolism， were screened by metabolic pathway analysis. ConclusionPTSB has a similar chemical composition to that of PTR， and it may regulate the metabolism of amino acids and vitamins through the flavonoids and isoflavonoids， thus exerting a potential hepatoprotective effect. This study provides an experimental reference for the clinical application and product development of PTSB.

Objective:To explore the effectiveness of modified objective structured clinical examination (OSCE) for evaluating the core competencies of new nurses on standardized training in neurosurgery.Methods:Thirty-seven new nurses on standardized training in neurosurgery were evaluated using a modified OSCE protocol that was focused on core competencies required for clinical nursing practice on the basis of a clinical case library, which consisted of diagnostic assessment upon entrance, process teaching evaluation during training, and outcome assessment upon exit, at five OSCE stations (nursing assessment, skill practice, clinical thinking, health education, and humanistic care). SPSS 26.0 was used to perform the t-test and rank sum test. Results:The nurses highly recognized the effectiveness of modified OSCE and were largely satisfied with teaching. There were significant differences at entrance and exit in terms of the mean OSCE score ( t=24.21, P<0.001), independent learning ability ( t=10.29, P<0.001), and the scores of core competencies—good personal traits ( Z=5.24, P<0.001), clinical nursing ability ( Z=5.07, P<0.001), support and interpersonal communication ability ( Z=5.12, P<0.001), critical clinical thinking ability ( Z=5.17, P<0.001), professional construction and self-development ( Z=5.05, P<0.001), and the total score ( Z=5.27, P<0.001). Conclusions:The modified OSCE can comprehensively evaluate the core competencies of new nurses in neurosurgery standardized training, with good feasibility and effectiveness, which provides a reference for teaching management of standardized training programs.

Type 2 diabetes mellitus （T2DM） is a heterogeneous disease with insulin deficiency and insulin resistance （IR） as the main etiology and is often accompanied by complications. Volatile oil is a volatile oily liquid extracted from natural plants， which has many pharmacological effects such as regulating Qi， relieving pain， inhibiting bacteria， and reducing inflammation. In recent years， there have been numerous reports on the treatment of T2DM by natural plant volatile oil and its effective components， which has become one of the new directions in the treatment of T2DM. With natural plant essential oil and its active components as the starting point， this paper comprehensively analyzed and summarized the material basis， mechanism， and signaling pathways of essential oil in the treatment of T2DM and its complications in China and abroad in recent years， and focused on the inhibitory effect of essential oil and its active components， such as carvacrol， paeonol， and β-caryophylene， on IR to improve T2DM by protecting pancreatic β-cells， inhibiting α-glucosidase activity， regulating the abundance and diversity of intestinal microbiota， and regulating glucose transporter protein type4 （GLUT4）， adenylate 5′-monophosphate-activated protein kinase （AMPK）， phosphatidylinositol-3 kinase （PI3K）/protein kinase B （Akt） signaling pathways to provide some references for the volatile oil intervention in T2DM and the development of new green antidiabetic drugs.

Objective:To explore the application effect of progressive case teaching method based on core competency in standardized nursing training.Methods:A total of 63 nursing students rotated in department of neurosurgery from June 2020 to June 2022 were selected as the research objects and randomized into experimental group ( n=31) and control group ( n=32). The experimental group adopted the progressive case teaching method based on core competency, and the control group adopted the conventional teaching mode. The data was analyzed using SPSS 26.0 to conduct t-test or non-parametric test based on the data normality for comparing the theory results, objective structure clinical examination (OSCE) scores, core competency, self-directed learning ability scores, teaching satisfaction and nursing satisfaction of patients in two wards between the two groups. Results:The theoretical results ( t=4.74, P<0.001) and OSCE scores ( t=3.81, P<0.001) of the experimental group were better than those of the control group. The scores of core competency and autonomous learning ability ( t=4.32, P<0.001) of the experimental group were better than those of the control group. The teaching satisfaction score ( t=2.21, P=0.044) and patient satisfaction score ( t=2.92, P=0.011) of the observation group were better than those of the control group. Conclusion:The progressive case teaching method based on core competency can improve the post competency of nurses, and also improve the teaching satisfaction rate and patient satisfaction rate, which is worthy of being carried out in the subsequent teaching activities.

【Objective】 To explore the causes of apheresis platelet donors lapsing in Huzhou area, so as to provide basis for better maintenance of blood donor team. 【Methods】 The data of 1 128 platelet donors from November 1, 2018 to October 31, 2021 were collected, and they were divided into regular blood donor group and lapsed blood donor group, and their work situation, social relations and donation process were investigated through questionnaire survey.Based on the basic characteristics of blood donors, 15 variables were set and analyzed by t test, chi-square test and multivariate logistic regression analysis using SPSS 23.0 software. 【Results】 There were 602 (53.37%, 602/1 128) regular blood donors and 526 (46.63%, 526/1 128) lapsed blood donors in the donor bank during recent 3 years.No significant differences were found in age, gender, educational background, blood donation reaction as well as the satisfaction to service attitude and technical level of blood station staff between the two groups (P>0.05), but significant difference was noticed in whether they were freelancers or changed jobs recently, the working hours per week (h), whether they had friends who donated platelets, had relatives who received/had a serious disease, had children or not, whether satisfied with the frequency of recruitment, and whether the donation was convenient (P<0.05, P<0.01). Multivariate logistic regression analysis showed that recruitment frequency (OR=2.679), convenience of blood donation (OR=2.486), having friends who donated blood (OR=1.791), the working hours per week (OR=1.011), changing jobs (OR=0.558) and having children (OR=0.465) were included in the final regression model and were the influencing factors of blood donor lapsing(P<0.01). 【Conclusion】 Platelet donor lapsing is prominent in Huzhou, therefore efficient communication approaches should be established between blood stations, between blood donors and blood donor, and between blood banks; personalized service should be adopted to maintain apheresis platelet donors.

Objective:To evaluate the effect of anatomic resection (AR) and nonanatomic resection (NAR) on the prognosis of hepatocellular carcinoma (HCC) patients of China Liver Cancer Staging (CNLC) Ⅰa.Methods:PubMed, Embase and Cochrane Library databases were searched for articles on AR and NAR of CNLC Ⅰa stage HCC from January 2000 to March 2021. A meta-analysis was performed on patient characteristics, tumor characteristics, surgical procedures, postoperative pathological characteristics and long-term prognosis.Results:Of 9 case-control studies were included in this study, there were 2761 patients, with 1727 cases in the AR group and 1034 cases in the NAR group. When compared with the NAR group, the AR group had lower proportion of liver cirrhosis, lower ICG R15 value, higher proportion of Child-Pugh A grade, larger tumor diameter, higher proportion of microvascular invasion, longer operation time and higher intraoperative blood loss. The AR group had a better postoperative 5-year disease-free survival rate [ OR=1.54, 95% CI: 1.30-1.82, P<0.001] and a higher postoperative 5-year overall survival rate [ OR=1.27, 95% CI: 1.04-1.55, P=0.018]. Conclusion:AR is significantly better than NAR for preventing long-term recurrence and improving long-term survival in patients with CNLC Ⅰa stage HCC.

Objective:To explore the effect of cabinet type water curtain exhaust hood applied to small sandblasting machine to prevent and control silicon dust, and put forward a new idea of dust ventilation protection facilities to effectively protect the occupational health of workers.Methods:From August to October 2018, the cabinet type water curtain exhaust hood of sandblasting room in a research institute was selected as the research object, and the methods of occupational health survey, on-site detection and physical simulation of air distribution were used to conduct on-site detection and smoke emission test on the local exhaust facilities, silica dust concentration, control wind speed and air distribution before and after the transformation line analysis and evaluation.Results:The air distribution simulation experiment showed that the air distribution of the cabinet type water curtain exhaust hood was reasonable and could effectively control the whole range of silica dust emission during the cleaning process. After modification, the capture velocity was increased from 0.01 m/s to 0.53 m/s, and the capture velocity was increased by 98.1%. The time weighted average allowable concentration ( CTWA) of silicon dust (total dust) during sand blasting, cabin opening and cleaning was reduced from 7.00 mg/m 3 to 0.50 mg/m 3. The CTWA of silica dust (exhalation dust) was decreased from 3.36 mg/m 3 to 0.27 mg/m 3, and the CTWA dust reduction rates of total dust and respirable dust were 92.9% and 92.0%, respectively. Conclusion:The combination of cabinet type exhaust hood and water curtain dedusting optimizes the combination mode of dust prevention and control. It has the advantages of high efficiency of dedusting and purification, energy saving and environmental protection, and can be popularized and used in enterprises of the same nature.

Objective:To explore the effect of cabinet type water curtain exhaust hood applied to small sandblasting machine to prevent and control silicon dust, and put forward a new idea of dust ventilation protection facilities to effectively protect the occupational health of workers.Methods:From August to October 2018, the cabinet type water curtain exhaust hood of sandblasting room in a research institute was selected as the research object, and the methods of occupational health survey, on-site detection and physical simulation of air distribution were used to conduct on-site detection and smoke emission test on the local exhaust facilities, silica dust concentration, control wind speed and air distribution before and after the transformation line analysis and evaluation.Results:The air distribution simulation experiment showed that the air distribution of the cabinet type water curtain exhaust hood was reasonable and could effectively control the whole range of silica dust emission during the cleaning process. After modification, the capture velocity was increased from 0.01 m/s to 0.53 m/s, and the capture velocity was increased by 98.1%. The time weighted average allowable concentration ( CTWA) of silicon dust (total dust) during sand blasting, cabin opening and cleaning was reduced from 7.00 mg/m 3 to 0.50 mg/m 3. The CTWA of silica dust (exhalation dust) was decreased from 3.36 mg/m 3 to 0.27 mg/m 3, and the CTWA dust reduction rates of total dust and respirable dust were 92.9% and 92.0%, respectively. Conclusion:The combination of cabinet type exhaust hood and water curtain dedusting optimizes the combination mode of dust prevention and control. It has the advantages of high efficiency of dedusting and purification, energy saving and environmental protection, and can be popularized and used in enterprises of the same nature.

Objective:To investigate the relations of serum hypoxia inducible factor 2α (HIF-2α) and miR-21 expressions with cerebral vasospasm in patients with aneurysmal subarachnoid hemorrhage (aSAH) after interventional embolization.Methods:One hundred and seventy-four patients with aSAH underwent interventional embolization in our hospital from October 2017 to June 2019 were prospectively selected. DSA examination was performed 4 d after surgery, and severity of cerebral vasospasm was evaluated. Enzyme-linked immunosorbent assay was used to detect the level of serum HIF-2α and reverse transcription-PCR was employed to detect the serum miR-21 expression before and 3 and 7 d after interventional embolization. The clinical data and changes of serum HIF-2α and miR-21 expressions in patients with different degrees of cerebral vasospasm were compared. Correlation analysis was performed to analyze the relation of HIF-2α expression with miR-21 expression 3 and 7 d after interventional embolization. Receiver operating characteristics curve was used to analyze the diagnostic values of serum HIF-2α and miR-21 levels in cerebral vasospasm 3 d after interventional embolization.Results:There were 100 patients without vasospasm, and 20, 38 and 16 patients with mild, moderate and severe cerebral vasospasm, respectively. The serum levels of HIF-2α and miR-21 in patients with mild, moderate and severe cerebral vasospasm increased successively 3 and 7 d after interventional embolization, with significant differences ( P<0.05). Positive correlation was noted between expressions of HIF-2α and miR-21 in serum 3 and 7 d after interventional embolization ( P<0.05). Area under the curve (AUC) of HIF-2α in diagnosis of cerebral vasospasm was 0.748 ( 95%CI: 0.615-0.883, P=0.000) 3 d after interventional embolization. AUC of serum miR-21 level in diagnosis of cerebral vasospasm was 0.715 ( 95%CI: 0.590-0.842, P=0.000). AUC of serum HIF-2α combined with miR-21 in diagnosis of cerebral vasospasm was 0.893 ( 95%CI: 0.792-0.985, P=0.000). When diagnostic critical points of HIF-2α and miR-21 were 82.75 pg/mL and 1.15, the sensitivity, accuracy and negative predictive value of HIF-2α combined with miR-21 in the diagnosis of cerebral vasospasm were higher than those of HIF-2α or miR-21 alone. Conclusion:The expressions of serum HIF-2α and miR-21 in patients with aSAH after interventional embolization can effectively predict the occurrence of cerebral vasospasm, and may be involved in the occurrence and development of cerebral vasospasm.