Objective To explore the characteristics of ischemia-reperfusion induced infant lung damage and the potential mechanisms of the injuried.Methods Both infant (15-21 days old) and adult (5-6 months old) rabbits were subjected to either ischemia-reperfusion or sham operation.Ischemia-reperfusion was induced by clamping the right pulmonary hilum for 1 hour and then removal of the clamp for 4 hours under anesthesia.The lung tissue were sampled for histological examination by light and electron microcopies and for biological evaluation of mitochondrial alterations.Production and expression of free radical species-hydroxyl radical (ROS-HR),malondialdehyde (MDA),superoxide dismutase (SOD),glutathione peroxidase (GSH-PX),myeloid differentiation factor-88 (MyD-88),and nuclear factor-κB (NF-κB) in the lung tissue were also examined.In addition,circulating levels of interleukin-β and tumor necrosis factor-α were measured during the ischemia-reperfusion process.Results In comparison to adult lungs,the infant lungs had more increased neutrophil infiltration,edema,swelled alveolar epithelial and endothelial cells,and severer mitochondrial impairment reflected by damage of the inner membrane as well as decrease in the membrane potential after ischemia-reperfusion.The lungs in infant animals subjected to sham operation displayed higher levels of ROS-HR and MDA and lower levels of SOD and GSH-PX than those in adult controls.The lungs in infants with ischemia-reperfusion were found to further produce more ROS-HR,and MDA,and less SOD and GSH-PX than the ischemia-reperfused adult lungs.Moreover,the circulating levels of interleukin-1β and tumor necrosis factor-α were elevated during the period of ischemia-reperfusion,particularly in the infant animals,which appeared to be associated with the expression of MyD-88 and NF-κB in the lungs.Conclusion Lung ischemia-reperfusion causes more severe lung damage in infants than in adults,probably due to combination of low antioxidant capacity and overproduction of ROS in infants.

Objective To investigate the olfactory function in patients with systemic lupus erythematosus (SLE) and to explore factors that may influence it.Methods The Connecticut Chemosensory Clinical Research Center (CCCRC) test was carried out in SLE patients and healthy controls for olfactory function testing.ELISA method was used to detect anti-ribosomal P protein antibody in the serum.The statistical methods used in this study including t test,ANOVA,LSD-t test,Pearson correlation analysis,multiple linear regression analysis,andx2 test.Results ① The CCCRC scores of the active,inactive group and healthy controls were compared,the difference was statistical significant (F=26.52,P=0.01).CCCRC score in active SLE group (62±16) was lower than that of the inactive group (80±13) the and the normal control group (83±12) (P＜0.01),while there was no statistical significant difference between the inactive group and the normal controls (P=0.226).② CCCRC score was lower in 16 ARPA positive SLE patients (61±17) than 49 negative patients (74±16) (t=2.681,P=0.009).③ In addition,CCCRC score showed a negative correlation with ARPA serum concentration (r=-0.327,P=0.008).There was no significant correlation between CCCRC score and disease course (r=0.141,P＞0.05).④ Multiple linear regression analysis indicated that CCCRC score was associated with age and ARPA.Conclusion SLE patients have olfactory dysfunction and the dys-function is associated with age and ARPA.

Objective To explore the accuracy and clinical efficacy of advanced 3D printing navigation templates in assisting placement of atlantoaxial pedicle screw.Methods A retrospective analysis was carried out on 49 cases of patients with atlanto-axial vertebral fractures and dislocations between June 2013 and June 2016,and all of them were given posterior incision,reduction and internal fixation of atlantoaxial pedicle screw.The patients were divided into advanced 3D printing navigation template group (14 cases),early 3D printing navigation template group (16 cases),and routine pedicle screw placement group (19 cases).Atlantoaxial CT data of patients in advanced 3D printing navigation template group and early 3D printing navigation template group were input into Mimics 17.0,then advanced 3D printing navigation template group and early 3D printing navigation which were used in clinic surgery were designed and printed.The relationship between positions of pedicle screw with the pedicle and bone cortex in plain CT image was observed after operation.The quality of the screw position was assessed and the accuracy of three kinds of screwing methods was compared.The accuracy of the screwing angle was assessed by comparing with the differences between the preoperative designed channel inclination angle and postoperative actual screwing angle.Three groups were compared for differences between operation time,intraoperative blood loss,and scores of cervical nerve scale and visual analogue scale (VAS) of neck and shoulder pain by Japanese Orthopaedic Association (JOA).Results All 49 cases of patients successfully completed the surgery.Patients of the routine pedicle screw placement group,early 3D group and advanced 3D group correspond operation time for 141.2±20.7 min,112.5±12.1 min and 103.1±10.4 min,intraoperative blood loss for 314.0±81.4 ml,243.6±71.2 ml and 181.0+59.1 ml;total accuracy of screwing for 75.0％ (54/72),93.75 ％ (60/64) and 96.43 ％ (54/56).There were statistically significant differences among the routine group,3D group and advanced 3D group in the mentioned programs.There were no statistical differences between advanced 3D group and 3D group in the inclination angle and head tilt angle with the pre-designed values,while there was statistically significant difference between the routine group and the pre-designed value.The accuracy of the inclination angle and bead tilt angle screwing angle were obviously superior in the advanced 3D group and early 3D group to that of the routine group.There were statistically significant differences between preoperative with postoperative VAS scores and JOA scores in the same group,while there were no statistically significant differences among groups in JOA.But there was statistically significant difference between the routine group and the advanced 3D in VAS,and there was no statistically significant difference between the routine pedicle screw placement group and the early 3D in VAS.All three groups of patients had bony fusion of atlantoaxial vertebral body,without loosening,dislocation and fracture of the internal fixators.Conelusion Advanced 3D printing templates in assisting the surgical treatment for atlantoaxial fracture and dislocation can improve the accuracy of pedicle screwing and safety of the surgery,reduce the surgery risk,and obtain satisfied clinical curative effects.

Objective To analyze the genetic characteristics of Legionella pneumophila isolated from cooling water of central air conditioning system in public places in Zhongshan from 2012 to 2018, and to understand the spatiotemporal distribution of homologous strains, in order to provide evidence for the prevention, control and traceability of Legionella pneumophila infection. Methods Eighty-five Legionella pneumophila strains were isolated for serotype identification, and the molecular typing of the 85 isolates was performed using pulsed field gel electrophoresis (PFGE). The strain location data was converted into latitude and longitude coordinates by GIS geocoding technology. The converted location data was overlaid on the map of Zhongshan City, mapping the molecular typing distribution of clusters using Qgis2.18.11 spatial processing software. Results Eighty-five strains of Legionella pneumophila included 9 serotypes, and the highest proportion was LP1, accounting for 61.18% (52/85). According to the similarity of 100%, 85 strains of Legionella pneumophila were divided into 56 patterns of PFGE bands (T1-T56), with 3 types being dominant. Same serotype of Legionella pneumophila strains showed diverse PFGE patterns. Different serotypes of Legionella pneumophila strains were basically identified as different PFGE patterns, while some were identified as same PFGE pattern. According to over 85% similarity, 8 clusters (A-H) were designated, strains of which were distributed in 12 districts. PFGE clustering clusters did not display obvious temporal and regional distribution differences, nor did they have temporal and regional clustering distributions. Conclusion Strains of Legionella pneumophila isolated from cooling water of central air conditioning system in public places in Zhongshan from 2012 to 2018 showed genetic diversity, and the main serotype was LP1. Isolates of clusters did not exist in different years or regions.

Objective To investigate the etiological characteristics of food poisoning isolates of Vibrio parahaemolyticus (VP) from 2019 to 2021 in Zhongshan City. Methods A total of 37 strains of Vibrio parahaemolyticus isolated from 8 food poisoning incidents in Zhongshan City from 2019 to 2021 were collected, including 1 residual food isolate and 36 human isolates. The genetic correlation of Vibrio parahaemolyticus food poisoning isolates in this region was analyzed by serological typing, virulence gene detection (TLH, TDH, and TRH), drug sensitivity test, pulsed field gel electrophoresis (PFGE) and multipoint sequence typing (MLST). Results The 37 strains of Vibrio parahaemolyticus were divided into 4 serotypes: O3:K6, O10:K4, O4:K8, and O4:KUT. The tdh+ and trh- were the main virulence genotypes, accounting for 97.30% (36/37). The drug resistance rate of cefazolin was 40.54% (15 strains R, 22 strains I), and no multidrug-resistant strains were found. The 37 VP strains were divided into 23 PFGE types and 6 cluster groups, with correlation coefficients ranging from 60.4%-100%. The multipoint sequencing typing showed that the 37 VP strains were divided into 9 ST types and 3 complex groups, of which ST3 type was the main type (23 strains, 62.1%). Conclusion This study has found that the dominant virulence types of Vibrio parahaemolyticus food poisoning isolates in Zhongshan City from 2019 to 2021 are tdh⁺ and trh^-, and 37 representative strains can be divided into 6 PFGE clusters and 9 ST types with MLST type being mainly ST3. This study has identified the rare serotype O10:K4 which has caused an increase in the proportion of food poisoning events, suggesting that we should strengthen detection and be alert to the risk of continued local epidemics of new rare serotype strains.