Objective To explore the possible effect and mechanism of quercetin (QU) in inhibiting scar formation after the alkali burn of rat's cornea. Methods We established corneal alkali-burn model on right eyes of the SD rats. The rats were divided into five groups randomly. The control group received blank ophthalmic gel; the QU treatment groups received 2.5, 5, 10, or 20g/kg quercetin ophthalmic gel, respectively. The rats were checked by slit-lamp microscope every day for the degree of corneal opacity, then were killed on day 4, 7, 14, 21 and 28 after operation. The infiltration of the inflammatory cells was observed by histology, the arrangement and proliferation of the collagen fibers in the corneal stroma were observed by Masson trichrome staining. The expression of transforming growth factor-β_1 (TGF-β_1) and receptor of transforming growth factor-βⅠ(TGF-βRⅠ) in cornea was observed by immunohistochemical method. Results The corneal opacity was less severe in the QU treatment groups than in the control group (P<0.05). Corneal scar was inhibited better in 10g/kg QU and 20g/kg QU groups than in 2.5g/kg and 5g/kg QU groups, and 10g/kg and 20g/kg QU groups had no significant differences (P>0.05). HE and Masson staining showed that the density of corneal stroma collagen fibers in the QU treatment groups was lower than that in the control group. The expression of TGF-β_1 and TGF-βRⅠ reached the peak on day 7 after alkali burn, and then decreased slowly, which was close to the normal level. The expression of TGF-β_1 and TGF-βRⅠ was inhibited better in 10g/kg and 20g/kg QU groups than in 2.5g/kg and 5g/kg groups, and 10g/kg and 20g/kg QU groups had no significant differences (P>0.05). Conclusion QU ophthalmic gel can reduce formation of corneal scar to a certain extent, 10g/kg is the optimal concentration. QU may play its role by inhibiting the expression of TGF-β1 and TGF-βRⅠ.

Objective To investigate the effect of wire?reinforced epidural catheters on the success rate of epidural catheterization for labor analgesia. Methods A total of 200 nulliparous parturients who re?ceived labor analgesia voluntarily, of American Society of Anesthesiologists physical status Ⅰ or Ⅱ, aged 20-45 yr, with body mass index<35 kg∕m2, were divided into 2 groups (n=100 each) using a random number table: common catheter group ( group Ⅰ) and reinforced catheter group ( group Ⅱ) . After suc?cessful epidural puncture, the corresponding catheter was inserted inⅠandⅡgroups. The development of difficult insertion, intravascular catheter insertion or paresthesia during insertion was defined as a failure of epidural catheterization. The occurrence of the failure of epidural catheterization was recorded. Results Compared with group Ⅰ, the failure rate of epidural catheterization was significantly decreased in groupⅡ( P<0.05) . Conclusion Wire?reinforced epidural catheters can raise the success rate of epidural catheter?ization for labor analgesia.

OBJECTIVE:To select a best therapeutic scheme for diabetes among four kinds of oral hypoglycemic drugs:repaglinide(Novonorm),glibenclamide,gliclazide and glipizide.METHODS:According to the principle of pharmacoeconomics,using cost-effectiveness analysis(CEA),assessment and survey of the influencing factors(price,dosage)were carried out,at the same time,sensitive analysis was performed.RESULTS:The best therapeutic scheme was Novonorm and the rest were gliclazide,glipizide and glibenclamide in sequence.CONCLUSION:The result of sensitive analysis is in keeping with that of CEA,which indicates the credibility of CEA.

Objective To evaluate the protective effects of different modes of ventilation on the lungs on the operated side during one-lung ventilation (OLV ) in patients undergoing thoracic surgery .Methods Forty-five ASA physical status Ⅰ or Ⅱ patients of both sexes ,aged 45-64 yr ,weighing 65-80 kg ,were randomly divided into 3 groups (n=15 each) using a random number table :group A ,group B and group C .After induction of anesthesia ,the patients were intubated with double-lumen tube and OLV was performed .During OLV ,the lung on the operated side was collapsed naturally in group A ,positive pressure ventilation (FGF 2 L/min) was applied in the lung on the operated side in group B ,and high-frequency jet ventilation (frequency 100 beats/min ,driving pressure 0.5 kg/cm2 ) was used in the lung on the operated side in group C .Immediately after intubation (T0 ) , and at 1.5 h (T1 ) and 2 h (T2 ) of OLV ,blood samples were taken from the central vein and radial artery for determination of the serum interleukin-6 (IL-6 ) and IL-8 concentrations .The net release of IL-6 and IL-8 was calculated .Blood samples were taken from the radial artery at T0-2 for blood gas analysis and for determination of surfactant protein A (SP-A) concentration in the serum .Respiratory index (RI) was calculated .The non-cancer tissues 1.0 cm × 1.0 cm × 1.0 cm which were extracted from the lung cancer specimens were used for microscopic examination of the pathological changes of lungs which were scored .Results Compared with group A ,the net release of IL-6 and IL-8 ,serum SP-A concentration ,RI and pathological scores were significantly decreased at T1 ,2 in B and C groups ( P<0.05) .Compared with group B ,the serum SP-A concentration and RI were significantly decreased at T1 ,2 , and the net release of IL-6 was increased at T2 in group C ( P< 0.05 ) .Conclusion Continuous positive ventilation and high-frequency jet ventilation both can effectively protect the lungs on the operated side during OLV in patients undergoing thoracic surgery ,and the efficacy of high-frequency jet ventilation is better .

Objective To explore the applications and effect of experience-based health education in maternal nursing in community.Methods According to the random number table,150 women pregnant for the first time were divided into control group and observation group with 75 in each group. In the control group,the traditional method for health education was used and in the observation group the experience-based teaching based on traditional health education.The two groups were compared in terms of the awareness rate of knowledge about maternal and infant health care and the incidence of postpartum depression.Result The awareness of knowledge about maternal and infant health care in the observation group was significantly higher than that of the control group and the incidence of postpartum depression in the observation group was significantly lower than that of the control group(P<0.01).Conclusion Experience-based health education can improve the level of knowledge about maternal and infant health care and reduce the incidence of maternal postpartum depression.

AIM: To investigate the relationship among MCP-1 and monocyte chemoattract protein activity (MCA) and pathogenesis of lung cancer. METHODS: 173 patients were involved in the study and divided into three groups: group A: lung cancer group (60 patients); group B: benign lung disease group (55 patients) and group C: healthy control group (58 patients). MCP-1 level and MCA in bronchoalveolar lavage fluid (BALF) were measured. RESULTS: The concentration of MCP-1 and MCA in BALF in group A were much higher than those in group B and group C (P

Under the background of efficiency medical reform, the authors introduced the nursing efficiency management system of a large public hospital, which was divided into two dimensions: nursing resource allocation efficiency and nursing service efficiency. The specific four measures included the establishment of multi-campus unified management organization structure based on nursing management committee, nursing performance reform based on structured big data information platform, the construction of nurse-led patient whole process management model and the accelerated rehabilitation nursing practice from surgery to the whole hospital, so as to provide reference for the nursing efficiency management of large general public hospitals under the medical reform.

BACKGROUND:The anterior cruciate ligament has unique nonlinear mechanical properties under a complex physiological loading environment.Elastin is an important contributor to the mechanical properties of the anterior cruciate ligament,but its mechanical response to the anterior cruciate ligament under axial tension is not clear. OBJECTIVE:To quantitatively analyze the effect of elastin on the tensile mechanical response of the anterior cruciate ligament. METHODS:Elastase solution and control buffer were prepared.The porcine anterior cruciate ligament samples were prepared into small-size samples and randomly soaked in 0,0.1,1.0,2.0,5.0,and 10.0 U/mL elastase solution for 6 hours,and other small samples of the same size were soaked in 2 U/mL elastase solution for 0,1,3,6,9,and 12 hours.To determine suitable soaking conditions for elastin-targeted enzymes and verify the digestive effect,histological staining was used to compare the effects of enzyme treatment on tissue structure and composition.The ligament samples were randomly divided into elastase-treated group and PBS group,and immersed in 2 U/mL elastase solution and PBS buffer for 6 hours,respectively.A mechanical tensile test was performed before and after immersion. RESULTS AND CONCLUSION:(1)The biochemical results showed that being treated in 2 U/mL elastase solution for 6 hours could reduce the elastin content by 31.1%,and had no significant effect on other mechanical-related components in the tissue.(2)The histological results showed that elastase was able to penetrate the tissue,and the loose degree of tissue increased after treatment.(3)In the mechanical results before and after treatment,the mechanical properties of the PBS group decreased significantly,only the low-tension elastic modulus increased significantly and the initial length increased significantly in the elastase-treated group.(4)The intergroup comparison results showed that there was no significant difference between the two groups in pre-treatment,but the low-tension elastic modulus,initial slopes,saturated slopes,and initial length of the elastase-treated group after treatment were significantly higher than those in the PBS group.(5)These results suggest that elastin degradation significantly affects the biomechanical properties of the anterior cruciate ligament and further complements our understanding of the structure-function relationship of the anterior cruciate ligament.

Objective To optimize the method of combining azomethane oxide(AOM)and dextran sodium sulfate(DSS)to create a colitis-associated colon cancer(CAC)model,and to explore the pathogenesis of the intestinal flora in CAC.Methods Model groups A and B were established by one and two injections of AOM,respectively,combined with free drinking of DSS,and a normal control group was injected intraperitoneally with normal saline combined with purified water(n=10 mice per group).The better modeling scheme was selected by comprehensive evaluation of the disease activity index score,colon length,tumor rate,and mortality.Serum levels of interleukin-6(IL-6),tumor necrosis factor-α(TNF-α),and tumor markers CA199,CEA,and CA724 were detected by enzyme-linked immunosorbent assay.Colon lesions were evaluated by hematoxylin and eosin(HE)staining.Changes in the intestinal microbiota in CAC mice were detected by 16S rDNA high-throughput gene sequencing analysis of mouse feces.Results Both single and enhanced AOM injections combined with DSS induced CAC mice;however,colon growths were larger,more closely arranged,and their morphological size was more consistent in group B compared with group A,with a tumor-formation rate of 100％.IL-6 levels were increased in the model group compared with the normal group(P＜0.05).TNF-α levels were increased in the model group compared with the normal group(P＞0.05).The CA199 and CEA levels were also significantly increased(P＜0.05),but CA724 levels were not.Infiltration of inflammatory cells in the colon detected by HE pathology was accompanied by high-grade intraepithelial tumor-like changes on the surface of the lumen.The diversity and abundance of intestinal bacteria were decreased in CAC mice compared with normal mice:phyla Verrucomicrobiota and Actinobacteriota were significantly increased(P＜0.05),Bacteroidota and Campilobacterota were significantly decreased(P＜0.05).Akkermansia,Prevotellaceae,Ruminococcus,and Bifidobacterium were significantly increased(P＜0.05),and Roseburia,Rikenellaceae_RC9_gut_group,Anaeroplasma,and Muribaculaceae were significantly decreased(P＜0.05).Conclusions Two injections of AOM combined with 1.5％(1.5 g/100 mL)DSS induced CAC model mice with a high colon-tumorigenesis rate,uniform tumor morphology,and low mortality,and may thus be the preferred modeling scheme for pharmacodynamic experiments.Disorders or dysfunction of the intestinal flora may lead to increased permeability,loss of intestinal mucosal barrier function,and the release of enterogenic endotoxins,Resultsing in a sustained inflammatory response,as an indirect or direct cause of CAC pathogenesis.

Objective To analyze the characteristics of death and disease burden of residents in Pingshan District of Shenzhen City from 2019 to 2020 and provide data support for disease prevention and control. Methods The data of death surveillance and demography were collected. The causes of death were classified and coded according to ICD-10. The crude mortality, standardized mortality and potential years of life lost were calculated. Results From 2019 to 2020, 910 people died in Pingshan district.The average age of death was 64.94(47.06 - 82.34) years, the crude mortality was 102.04/100 000, the standardized mortality was 263.97/100 000, and the average life expectancy was 86.00 years. 558 men died and 352 women died , the crude mortality were 113.72/100 000 and 87.76 /100 000 , the standardized mortality rate 313.05/100 000 and 211.97/100 000 ; the average life expectancy were 84.66 years and 87.55 years . The crude mortality of male was higher than that of female (χ²=14.594, P<0.001). The standardized mortality of men was also higher than that of women. The top three causes of death in the whole population, men and women were circulatory system diseases, malignant tumors, diseases and injury from high to low. And the top three diseases with standardized potential life lost years and standardized potential life lost rate from high to low were injury, circulatory system diseases and malignant tumors. Conclusion Circulatory system diseases, malignant tumors, injury are the main causes of death and the three kinds of diseases with the heaviest disease burden in Pingshan District of Shenzhen city. Men are the key population for prevention and control. The prevention and control of the above three kinds of diseases should be done to reduce the mortality of local population.