OBJECTIVES: To investigate the effects of periodontitis induced by Prevotella nigrescens (Pn) combined with ligation on cognitive functions in mice. METHODS: Twenty-four C57BL/6J mice were randomly divided into control group, ligation group, and ligation + Pn treatment (P+Pn) group. Experimental periodontitis was induced by silk ligation of the first molars followed by topical application of Pn for 6 weeks. After modeling, alveolar bone resorption was assessed using micro-CT and histological analysis. Learning and memory abilities of the mice were evaluated using open field test (OFT), novel object recognition test (NORT), and Morris water maze test (MWM). Seven weeks after the start of modeling, the mice were sacrificed for examining histopathological changes in the hippocampus using HE and Nissl staining. RESULTS: After 6 weeks of molar ligation, micro-CT revealed horizontal alveolar bone resorption and furcation exposure in the mice, and histological analysis showed apical migration of the junctional epithelium, epithelial ridge hyperplasia, and lymphocyte infiltration, and these changes were obviously worsened in P+Pn group. Alveolar bone height decreased significantly in both ligation groups compared to the control group. Cognitive tests showed that the mice in both of the ligation groups traveled shorter distances in OFT, showed reduced novel object preference in NORT, and exhibited longer escape latencies in MWM, and the mice in P+Pn group had significantly poorer performances in the tests. Histologically, obvious neuronal cytoplasmic degeneration, necrosis, nuclear pyknosis, vacuolation, and reduced Nissl bodies and viable neurons were observed in the hippocampal regions of the mice in the two ligation groups. CONCLUSIONS Pn infection aggravates alveolar bone destruction, accelerates necrosis and causes morphological abnormalities of neuronal cells in the hippocampus to reduce cognitive functions of mice with periodontitis.
Animals ; Periodontitis/microbiology* ; Mice ; Mice, Inbred C57BL ; Cognition ; Alveolar Bone Loss ; Hippocampus/pathology* ; Male ; Inflammation ; Maze Learning

Objective To investigate the effects of periodontitis induced by Prevotella nigrescens(Pn)combined with ligation on cognitive functions in mice.Methods Twenty-four C57BL/6J mice were randomly divided into control group,ligation group,and ligation+Pn treatment(P+Pn)group.Experimental periodontitis was induced by silk ligation of the first molars followed by topical application of Pn for 6 weeks.After modeling,alveolar bone resorption was assessed using micro-CT and histological analysis.Learning and memory abilities of the mice were evaluated using open field test(OFT),novel object recognition test(NORT),and Morris water maze test(MWM).Seven weeks after the start of modeling,the mice were sacrificed for examining histopathological changes in the hippocampus using HE and Nissl staining.Results After 6 weeks of molar ligation,micro-CT revealed horizontal alveolar bone resorption and furcation exposure in the mice,and histological analysis showed apical migration of the junctional epithelium,epithelial ridge hyperplasia,and lymphocyte infiltration,and these changes were obviously worsened in P+Pn group.Alveolar bone height decreased significantly in both ligation groups compared to the control group.Cognitive tests showed that the mice in both of the ligation groups traveled shorter distances in OFT,showed reduced novel object preference in NORT,and exhibited longer escape latencies in MWM,and the mice in P+Pn group had significantly poorer performances in the tests.Histologically,obvious neuronal cytoplasmic degeneration,necrosis,nuclear pyknosis,vacuolation,and reduced Nissl bodies and viable neurons were observed in the hippocampal regions of the mice in the two ligation groups.Conclusion Pn infection aggravates alveolar bone destruction,accelerates necrosis and causes morphological abnormalities of neuronal cells in the hippocampus to reduce cognitive functions of mice with periodontitis.

Objective To assess the application value of mycoplasma pneumonia(MP)real-time fluorescence of RNA simultaneous amplification and testing(SAT)and MP antibody(MP-Ab)in the diagnosis of MP pneumonia(MPP)in children.Methods A total of 242 children with community-acquired pneumonia hospitalized at Beijing Haidian Hospital from September 2023 to October 2024 were enrolled as subjects.The children were divided into MPP group(n=193)and non-MPP group(n=49)based on MPP diagnosis.All children underwent simultaneous MP-SAT testing and initial MP-Ab detection within 24h of admission.MP-SAT results were monitored until they turned negative,with retesting for MP-Ab on 5-7d post-hospitalization in negative cases.The study compared diagnostic accuracy between MP-SAT and MP-Ab methods,while analyzing correlations between MP-SAT negative conversion time and clinical cure duration.Results For children with disease duration ≤ 7 days,MP-SAT demonstrated higher sensitivity than MP-Ab,with statistically significant difference(P＜0.001).The concordance between MP-SAT and initial MP-Ab test results was weak(Kappa=0.072),while the consistency between MP-SAT and follow-up MP-Ab test results was moderate(Kappa=0.614,P＜0.00 1).Both the clinical cure time and SAT seroconversion time were shorter with doxycycline treatment compared to azithromycin therapy.Conclusion The results of MP-SAT can be used to evaluate the condition of MPP children and guide the timely discontinuation of antibiotics.

Objective To assess the application value of mycoplasma pneumonia(MP)real-time fluorescence of RNA simultaneous amplification and testing(SAT)and MP antibody(MP-Ab)in the diagnosis of MP pneumonia(MPP)in children.Methods A total of 242 children with community-acquired pneumonia hospitalized at Beijing Haidian Hospital from September 2023 to October 2024 were enrolled as subjects.The children were divided into MPP group(n=193)and non-MPP group(n=49)based on MPP diagnosis.All children underwent simultaneous MP-SAT testing and initial MP-Ab detection within 24h of admission.MP-SAT results were monitored until they turned negative,with retesting for MP-Ab on 5-7d post-hospitalization in negative cases.The study compared diagnostic accuracy between MP-SAT and MP-Ab methods,while analyzing correlations between MP-SAT negative conversion time and clinical cure duration.Results For children with disease duration ≤ 7 days,MP-SAT demonstrated higher sensitivity than MP-Ab,with statistically significant difference(P＜0.001).The concordance between MP-SAT and initial MP-Ab test results was weak(Kappa=0.072),while the consistency between MP-SAT and follow-up MP-Ab test results was moderate(Kappa=0.614,P＜0.00 1).Both the clinical cure time and SAT seroconversion time were shorter with doxycycline treatment compared to azithromycin therapy.Conclusion The results of MP-SAT can be used to evaluate the condition of MPP children and guide the timely discontinuation of antibiotics.

Objective:To detect the pathogen and clinically diagnose for a suspected case of Neisseria meningitidis with positive blood culture result, and assess the risk of disease transmission among the community. Methods:Blood sample was collected for Neisseria meningitidis isolation and culture. Pathogen identification and serogroup typing were conducted by colony morphology, Gram staining, biochemical tests, latex agglutination test, slide agglutination test, and nucleic acid testing. The susceptibility to 12 antibiotics was also tested. Epidemiological investigation was conducted on the case, and epidemic control measures were also implemented. Results:Through various detection, the suspected case was diagnosed as Neisseria meningitidis invasive infection. The isolated strain belonged to group Y serotype, type 767 (multilocus sequence typing), and the ST167 clonal complex. The strain was sensitive to nine antibiotics, including penicillin, ampicillin, and meropenem. It exhibited intermediate sensitivity to ciprofloxacin and levofloxacin, and resistance to methicillin/sulfamethoxazole. Close contacts of the case and environmental testing results were negative. Conclusions:The case is confirmed to be an invasive infection caused by group Y Neisseria meningitidis, the ST167 clonal complex. Epidemiological investigation shows a relatively low risk of epidemic transmission. Continuous monitoring and surveillance are necessary for further assessment.

Humans ; Nitric Oxide ; Carcinoma, Non-Small-Cell Lung/drug therapy* ; Lung Neoplasms ; Lung ; Nitric Oxide Synthase ; Macrophages, Alveolar ; Pulmonary Alveoli

Pulmonary blast injury has become the main type of trauma in modern warfare, characterized by externally mild injuries but internally severe injuries, rapid disease progression, and a high rate of early death. The injury is complicated in clinical practice, often with multiple and compound injuries. Currently, there is a lack of effective protective materials, accurate injury detection instrument and portable monitoring and transportation equipment, standardized clinical treatment guidelines in various medical centers, and evidence-based guidelines at home and abroad, resulting in a high mortality in clinlcal practice. Therefore, the Trauma Branch of Chinese Medical Association and the Editorial Committee of Chinese Journal of Trauma organized military and civilian experts in related fields such as thoracic surgery and traumatic surgery to jointly develop the Clinical treatment guideline for pulmonary blast injury ( version 2023) by combining evidence for effectiveness and clinical first-line treatment experience. This guideline provided 16 recommended opinions surrounding definition, characteristics, pre-hospital diagnosis and treatment, and in-hospital treatment of pulmonary blast injury, hoping to provide a basis for the clinical treatment in hospitals at different levels.

Objective:To analyze the risk factors of bronchopulmonary dysplasia(BPD)in very preterm infants(VPI), and to provide scientific basis for the prevention and treatment of BPD in VPI.Methods:A prospective multicenter study was designed to collect the clinical data of VPI in department of neonatology of 28 hospitals in 7 regions from September 2019 to December 2020.According to the continuous oxygen dependence at 28 days after birth, VPI were divided into non BPD group and BPD group, and the risk factors of BPD in VPI were analyzed.Results:A total of 2 514 cases of VPI including 1 364 cases without BPD and 1 150 cases with BPD were enrolled.The incidence of BPD was 45.7%.The smaller the gestational age and weight, the higher the incidence of BPD( P<0.001). Compared with non BPD group, the average birth age, weight and cesarean section rate in BPD group were lower, and the incidence of male infants, small for gestational age and 5-minute apgar score≤7 were higher( P<0.01). In BPD group, the incidences of neonatal respiratory distress syndrome(NRDS), hemodynamically significant patent ductus arteriosus, retinopathy of prematurity, feeding intolerance, extrauterine growth restriction, grade Ⅲ~Ⅳ intracranial hemorrhage, anemia, early-onset and late-onset sepsis, nosocomial infection, parenteral nutrition-associated cholestasis were higher( P<0.05), the use of pulmonary surfactant(PS), postnatal hormone exposure, anemia and blood transfusion were also higher, and the time of invasive and non-invasive mechanical ventilation, oxygen use and total hospital stay were longer( P<0.001). The time of starting enteral nutrition, cumulative fasting days, days of reaching total enteral nutrition, days of continuous parenteral nutrition, days of reaching 110 kcal/(kg·d) total calorie, days of reaching 110 kcal/(kg·d) oral calorie were longer and the breastfeeding rate was lower in BPD group than those in non BPD group( P<0.001). The cumulative doses of amino acid and fat emulsion during the first week of hospitalization were higher in BPD group( P<0.001). Multivariate Logistic regression analysis showed that NRDS, invasive mechanical ventilation, age of reaching total enteral nutrition, anemia and blood transfusion were the independent risk factors for BPD in VPI, and older gestational age was the protective factor for BPD. Conclusion:Strengthening perinatal management, avoiding premature delivery and severe NRDS, shortening the time of invasive mechanical ventilation, paying attention to enteral nutrition management, reaching whole intestinal feeding as soon as possible, and strictly mastering the indications of blood transfusion are very important to reduce the incidence of BPD in VPI.

A male patient aged 1 year and 8 months with type 2 spondyloepimetaphyseal dysplasia with joint laxity (SEMDJL2) was reported. The clinical characteristics included short stature, flat middle face, hypotonia, limb joint relaxation, hyperextension of metacarpophalangeal articulation, etc. In addition, the patient had a history of congenital laryngeal stridor. Thus, SEMDJL2 was determined according to the above symptoms and medical history. Sanger sequencing showed that the child carried a c.443C>T missense mutation in the KIF22 gene, which resulted in an amino acid variation namely p.Pro148Leu. This phenotype was preliminarily determined as a pathogenic mutation. Therefore, it is suggested that next-generation sequencing genetic testing could be helpful for genetic diagnosis in children with congenital laryngeal stridor, systemic joint relaxation, and excessive joint extension.

Objective:To determine the gestational weight gain and its risk factors and adverse effects among pregnant women in Beijing.Methods:Between June 2018 and June 2019, all registered infants and their mothers in a child care center of a third-tier-class hospital in Beijing were selected. A self-made questionnaire was used to collect the basic information of the maternal mothers. Chi-square test and analysis of variance were used to describe the basic characteristics of the study subjects and clarify the harmful effect of gestational weight gain for maternal and infant health. Multiple logistic regression analysis was used to analyze the risk factors of both insufficient and excessive weight gain during pregnancy.Results:A total of 3732 maternal mothers and their babies were included. The average weight gain of maternal mothers during pregnancy was 13.0 kg. The results of this study showed that the proportion of insufficient weight gain during pregnancy was 31.8% and the proportion of excessive weight gain was 24.1%. It was further found that young age, pre-pregnancy body mass index indicating overweight and obesity, primipara, and low education were independent risk factors for excessive weight gain during pregnancy. The risk of excessive weight gain of pre-pregnancy overweight and obesity was 2.40 times ( OR=2.40, 95% CI=1.91-3.03, P<0.001) and 2.90 times higher, respectively, ( OR=2.90, 95% CI=1.59-5.27, P<0.001) when compared with that of pre-pregnancy normal weight. In addition, our results suggested that excessive weight gain significantly increased the risk of macrosomia for the infant and the risk of cesarean section, gestational hypertension, and postpartum weight retention for maternal mothers. Conclusions:Age, pre-pregnancy BMI, primipara, and education level were the influencing factors for gestational weight gain. Considering the serious harmful effects of both insufficient and excessive weight gain for maternal and infant health, weight management during pregnancy should be strengthened for these high-risk populations in the future.