Objective To analyze the clinical characteristics and the antimicrobial resistance of respiratory tract infection in children in Baoshan City,guide clinicians to rationally apply antibiotics,and improve the success rate of treatment.Methods Retrospective analysis of the distribution characteristics and drug sensitivity results of 1039 strains of pathogens detected in pediatric inpatients of hospitals from 2019 to 2022 was conducted.Results The main pathogens causing the respiratory infections in children in Baoshan area were Streptococcus pneumoniae,Escherichia coli,Staphylococcus aureus,Haemophilus influenzae,Klebsiella pneumoniae and Pseudomonas aeruginosa.Analysis of the drug sensitivity results of pathogenic bacteria with a detected quantity greater than 80 revealed that Streptococcus pneumoniae had a high resistance rate to erythromycin,clindamycin,and compound sulfamethoxazole.The resistance rates of penicillin,ceftriaxone,cefotaxime,and meropenem were P<0.05,and the difference was statistically significan.Methicillin-resistant Staphylococcus aureus(MRSA)was11.1%;CTX/CRO-R-ECO,CTX/CRO-R-KPN,CR-ECO and CR-KPN were lower than the 2021 ISPED level;The P.aeruginosa drug resistance rate and H.influenzae's ampicillin and ampicillin/sulbactam were higher than the 2021 ISPED level.Conclusion The treatment of respiratory tract infections in pediatric patients faces great challenges.The non-standard use of empirical medication has led to the emergence of multidrug-resistant bacteria,and the selection of anti infection treatment drugs is limited.Therefore,it is imperative to grasp the epidemic characteristics and drug resistance of pathogenic bacteria in the local area.

Objective:To explore the clinical symptoms, imaging and histopathological features of fibroadipose vascular anomaly (FAVA), and to propose the differential diagnostic criteria for FAVA and intramuscular venous malformation (IMVM).Methods:Clinical data of FAVA and IMVM patients admitted to the Department of Burn and Plastic Surgery, Jinling Hospital of Nanjing Medical University, General Hospital of Eastern Theater Command from January 2016 to December 2020 were retrospectively analyzed. The patients were divided into FAVA group and IMVM group, and the clinical symptoms, coagulation function and imaging results of the two groups were analyzed. The pathological characteristics of the surgically resected specimens were observed by HE staining, and the similarities and differences between FAVA and IMVM were summarized. Pearson chi-square test was used to investigate the occurrence of local intravascular coagulation (LIC) between the two groups, and P<0.05 was considered statistically significant. Results:Fourteen patients were included in FAVA group, including 4 males and 10 females. The age of treatment was (28.2 ± 13.2) years old and the age of onset was (20.5 ± 10.1) years old. A total of 39 patients were included in the IMVM group, including 16 males and 23 females. The age of treatment was (28.5 ± 14.1) years old and the age of onset was (18.8 ± 9.5) years old. The clinical symptoms of FAVA and IMVM patients were pain, swelling and paresthesia. MRI images of the FAVA group showed fat signal in muscle and varicose vascular shadow. The IMVM group showed large irregular vascular shadows in muscle without fat signal. Histopathological observation revealed fibroadipose hyperplasia accompanied by varicose veins in FAVA group. However, in IMVM group, the lesions showed a large number of malformed veins mixed with muscle, without fibroadipose hyperplasia. There were 2 cases of LIC in FAVA group and 21 cases of LIC in IMVM group, the difference was statistically significant ( χ2 =4.39, P=0.036). Conclusion:The clinical symptoms of FAVA and IMVM are similar. The differential diagnosis of FAVA and IMVM requires MRI and pathological examination. The main difference is that there is fibroadipose hyperplasia in FAVA lesion, while there is no fibroadipose hyperplasia in IMVM lesion.

Objective:To explore the clinical symptoms, imaging and histopathological features of fibroadipose vascular anomaly (FAVA), and to propose the differential diagnostic criteria for FAVA and intramuscular venous malformation (IMVM).Methods:Clinical data of FAVA and IMVM patients admitted to the Department of Burn and Plastic Surgery, Jinling Hospital of Nanjing Medical University, General Hospital of Eastern Theater Command from January 2016 to December 2020 were retrospectively analyzed. The patients were divided into FAVA group and IMVM group, and the clinical symptoms, coagulation function and imaging results of the two groups were analyzed. The pathological characteristics of the surgically resected specimens were observed by HE staining, and the similarities and differences between FAVA and IMVM were summarized. Pearson chi-square test was used to investigate the occurrence of local intravascular coagulation (LIC) between the two groups, and P<0.05 was considered statistically significant. Results:Fourteen patients were included in FAVA group, including 4 males and 10 females. The age of treatment was (28.2 ± 13.2) years old and the age of onset was (20.5 ± 10.1) years old. A total of 39 patients were included in the IMVM group, including 16 males and 23 females. The age of treatment was (28.5 ± 14.1) years old and the age of onset was (18.8 ± 9.5) years old. The clinical symptoms of FAVA and IMVM patients were pain, swelling and paresthesia. MRI images of the FAVA group showed fat signal in muscle and varicose vascular shadow. The IMVM group showed large irregular vascular shadows in muscle without fat signal. Histopathological observation revealed fibroadipose hyperplasia accompanied by varicose veins in FAVA group. However, in IMVM group, the lesions showed a large number of malformed veins mixed with muscle, without fibroadipose hyperplasia. There were 2 cases of LIC in FAVA group and 21 cases of LIC in IMVM group, the difference was statistically significant ( χ2 =4.39, P=0.036). Conclusion:The clinical symptoms of FAVA and IMVM are similar. The differential diagnosis of FAVA and IMVM requires MRI and pathological examination. The main difference is that there is fibroadipose hyperplasia in FAVA lesion, while there is no fibroadipose hyperplasia in IMVM lesion.

Objective:To propose a deep learning network model 2D-PE-GAN to automatically delineate the target area of nasopharyngeal carcinoma and improve the efficiency of target area delineation.Methods:The model adopted the architecture of generative adversarial networks which used a UNet similar structure as the generator, and 2D-PE-block was added after each layer of convolution operation of the generator to improve the accuracy of delineation. The experimental data included CT images from 130 cases of nasopharyngeal carcinoma. The images were preprocessed before model training. In addition, three models of UNet, GAN, and GAN with an attention mechanism were compared, and Dice similarity coefficient, Hausdorff distance, accuracy, Matthews correlation coefficient, Jaccard distance were employed to evaluate network performance.Results:Compared with UNet, GAN and GAN with the attention mechanism, the average Dice similarity coefficient of 2D-PE-GAN network segmentation of CTV was increased by 26%, 4% and 2%. The average Dice similarity coefficient of GTV segmentation was increased by 21%, 4%, 2%, respectively. Compared with the GAN network with the attention mechanism, the parameters and time of 2D-PE-GAN were reduced by 0.16% and 18%, respectively.Conclusions:Compared with the above three networks, 2D-PE-GAN network can increase the segmentation accuracy of nasopharyngeal carcinoma target area delineation. At the same time, compared with the attention mechanism with similar reasons, 2D-PE-GAN network can reduce the occupation of computing resources when the segmentation accuracy is not much different.

The outbreaks caused by coronavirus (CoV) infections including severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS) and COVID-19 have emerged in recent years, posing a continued threat to public health. Highly pathogenic CoV infections usually induce a series of immune responses, including innate immunity, humoral immunity, cellular immunity and mucosal immunity. These responses not only are critical to suppressing and eliminating the invasion of viruses, but also play an important role in immunopathological changes and disease progression. A deep understanding of the dual roles of immune responses will help to elucidate the pathogenic mechanism of CoV and maintain the balance between immune protection and immunopathology, which will be conducive to the research and development of safe and effective CoV vaccines. This review summarized the dual roles of immune responses in highly pathogenic CoV infections and discussed the implications for the research and development of novel CoV vaccines.

BACKGROUND: A number of clinical trials addressing olfactory ensheathing cells for the treatment of chronic spinal cord injury have been conducted in the world, but the efficacy and safety are still controversial. OBJECTIVE: To evaluate the safety and efficacy of olfactory ensheathing cell transplantation for chronic spinal cord injury, and to further compare its short-and long-term efficacy. METHODS: PubMed, Cochrane Library, EMBASE, CNKI and WanFang databases were searched at July 23, 2018 for retrieval of clinical trials addressing olfactory ensheathing cells in the treatment of chronic spinal cord injury. Types and cases of adverse events during the safety trial should be recorded in detail. In the enrolled studies, American Spinal Injury Association scale was used to assess the motor, light touch, and pinprick scores of spinal cord injury patients before and after cell transplantation. The follow-up time was recorded. Systematic evaluation of efficacy data was performed using Review Manager 5.3. RESULTS AND CONCLUSION: Both short-and long-term follow-up data showed that the neurological function of patients was significantly improved after olfactory ensheathing cell transplantation (P < 0.05) , and the results were homogeneous (I2 < 50％ and P> 0.1). However, the long-term efficacy was not as good as the short-term efficacy, which may be related to chronic rejection and olfactory ensheathing cell survival. The overall adverse event rate was 8.99％, and no complications associated with olfactory ensheathing cells occurred. These findings show that olfactory ensheathing cell transplantation is effective and safe in the treatment of chronic spinal cord injury, but it is still necessary to explore more minimally invasive approaches to reduce surgical complications. In addition, a large number of high-quality experiments and clinical trials are warranted to confirm factors affecting the long-term efficacy of olfactory ensheathing cell transplantation.

Objective To detect different animal erythrocyte hemolysins titer,and compare the application of these hemolysins in immunological experimental teaching,for selecting the better method of preparing high titer hemolysin for experimental teaching of medical immunology.Methods A total of 40 experiment rabbits were divided into 4 groups in this study,and immunized by sheep red blood cell(SRBC) and porcine red blood cell(PRBC) through different immunization procedures to prepare the hemolysin,detect and compare these 4 groups hemolysins titer by the complement hemolysis test.Results Rabbit Anti-SRBC in the group A was 1∶4 800,rabbit Anti-PRBC in the group B was 1∶1 200,rabbit Anti-SRBC in the group C was 1∶1 000,rabbit Anti-PRBC in the group D was 1∶200.Conclusion The hemolysin titer of the rabbit Anti-PRBC was lower than that of the rabbit Anti-SRBC by the same immunization procedures,and the immunization procedure by intradermal multi-point and auricular vein injection is the better method of preparing high titer hemolysin,so PRBC could replace SRBC as antigen,and immunize the rabbits for preparing hemolysin,which could be used in experimental teaching of medical immunology.

Objective To observe the MRI characteristics in subacute combined degeneration (SCD)of the spinal cord.Methods The data of 1 9 SCD patients were retrospectively analyzed by the clinical characteristics and MR images.Results Among the 1 9 pa-tients of SCD,1 6 cases showed abnormal findings.Most of intramedullary lesions located in posterior column of thoracic and cervical spinal cord,and only one case located in cerebellar cortex and medulla oblongata.Lesions were involved in muti-segmental spinal cord,and mainly located in the dorsal or lateral spinal cord,and only two cases located in the anterior spinal cord.Different segmental spinal cord lesions had a different morphological characteristics with no enhancement.After treatments with vitamin B1 2 ,the lesions diminished and even disappeared in 2 cases.Conclusion MRI has important value in the diagnosis and treatment monitor of the SCD.

Objective To analyze the related factors,and discuss the causes and prevention measures of pharyngocutaneous fistula caused by total laryngectomy.Methods The complete chnical data of 118 patients underwent laryngeal ancer surgery were analyzed retrospectively.Analyzed the relationship between pharyngocutaneous fistula and the factors of sex,age,pre-operative nutrition states,preoperative radiotherapy,prior tracheotomy,neck dissection,tumor position,clinical stage of tumor,patho-staging,post-operative infection comobidity with analysis of single factor.Results Among the 118 cases of laryngeal carcinoma,17 cases were pharyngocutaneous fistula after operation,the incidence was 14.4％ (17/118).According to the statistical analysis results,the predominant influencing factors in the causation of pharyngocutaneous fistula were:pre-operative nutrition states,pre-operative radiotherapy,clinical stage of tumor and post-operative infection.Concusion Pharyngocutaneous fistula after total laryngectomy is related to many factors,avoiding the above mentioned factors can reduce the rate of fistula and improve the life quality.

Objective To compare the efficacies between nasal packing and no nasal packing after endoscopic sinus surgery for chronic sinusitis,and explore the feasibility of no nasal packing after endoscopic sinus surgery.Methods Eighty-two type 1 or type 2 chronic sinusitis patients who received endoscopic sinus surgery under general anesthesia were divided into no nasal packing group (44 cases,75 sides) and nasal packing group (38 cases,65 sides) by random digits table method.The patients in 2 groups were taken preoperative anti-inflammatory and regulation blood pressure treatment.The volume of bleeding,postoperative pain (visual analogue score,VAS),degree of mucosal edema,efficacy and postoperative complications between 2 groups were compared.Results There were no statistical difference in volume of bleeding and efficacy between 2 groups (P ＞ 0.05).The postoperative VAS in no nasal packing group was significantly lower than that in nasal packing group [(2.46 ± 0.54) scores vs.(5.49 ± 1.26) scores],there was statistical difference (P＜ 0.01).There was no statistical difference in mucosal edema score postoperative 1 week and 6 months between 2 groups (P ＞ 0.05),but the mucosal edema score postoperative 1 month in no nasal packing group was significantly lower than that in nasal packing group [(1.32 ±0.63) scores vs.(3.52 ±0.72) scores],there was statistical difference (P ＜ 0.01).Postoperative comphcations in nasal packing group were significantly more than those in no packing group.Conclusion No nasal packing can be performed for type 1 or type 2 chronic sinusitis patients who has no significant bleeding after endoscopic sinus surgery under general anesthesia,it is actually beneficial of relieving distress of the patient and reducing postoperative complications.