Background Studies showed that 577 nm subliminal micropulse photocoagulation for retinal diseases is more effective and much safer than 577 nm laser,but its mechanism and sensitive target cells are still unelucidated.Objective This study was to compare the histomorphology changes of rabbit retinas following 577 nm subliminal micropulse excitation and 577 nm laser for retinal photocoagulation and offer a conference for the clinical application of 577 nm subliminal micropulse excitation.Methods Twenty-six Chinese pigment rabbits were randomly divided into normal control group (2 rabbits),577 nm laser photocoagulation group (6 rabbits) and subliminal micropulse photocoagulation group (18 rabbits),in which the rabbits from subliminal micropulse photocoagulation group were subgrouped into 9％,12％ and 15％ subthreshold photocoagulation groups according to the different workload rates,and retinal photocoagulation was performed based on grouping.No treatment was carried out in the normal control group.Fundus camera and OCT were obtained after photocoagulation,and the rabbits were sacrificed to prepare the specimen of eyeball wall.Hematoxylin and eosin staining was employed to examine the histopathological change of choroid and retina under the light microscope.Results The retinal morphology was normal on the fundus color photography and OCT in the normal control group.Obscure of retinal structure and slight edema of retinal neuroepithelial layer with obscure of retinal pigment epithelium (RPE) was found respectively in the 9％ and 12％ subthreshold photocoagulation group,and serious edema of retinal neuroepithelial layer with local RPE elevation was visible in the 15％ subthreshold photocoagulation group.The laser spot was invisible in various subliminal micro pulse groups.However,retinal photocoagulation spots,multifocal elevation of retinal layer and serious detachment of retinal neuroepithelium were found in the 577 nm laser group.Retinal histopathological examination revealed that the photoreceptors,bipolar cells and retinal ganglion cell (RGC) layers were normal,while choroidal vessel deformation and bleeding were visible in the 9％ and 12％ subthreshold photocoagulation groups,and only photoreceptor membrane swelling was seen in the 15％ subthreshold photocoagulation group.However,retinal structure abnormality was displayed in 577 nm laser group,including the structural disorders of inner and outer nuclear layers and RGC layer as well as thinning of RPE layer.Conclusions 577 nm nicropulse laser under threshold is sensitive for RPE and choroid rather than retina neurepithelium,which can play a treating role and also does not damage retina seriously.However,577 nm laser photocoagulation results in retinal structure damage.

Objective:Selected virulence factors more than and high virulent Aeromonas hydrophia strain made into inactivated vaccine,to study the immunization effect of inactivated vaccine.Methods:Crucian were vaccinated with formalin-killed vaccine via in-traperitoneal injection.Controls were injected with the same volumes of saline.Then the antibody titres, histopathology and relative percent survival were analyzed from samples of both groups.Results: The antibody in the indirect agglutination reaction could be detected in vaccinated fish once a weeks after immunization and reached highest level 6 weeks after immunization.The histopathology analysis indicated that the vaccine had a good protective effect on crucian target organs.Vaccinated fish showed 100%relative percent survival and the immune period would be 6 month.Conclusion:The vaccine in this study has a significant protective effect on crucian and may be used as effective fish vaccines against bacterial septicemia.

OBJECTIVE To investigate the prevalence of nasal colonization among health care workers(HCWs).METHODS Nasal swabs from 93 ICU workers and 98 other clinical workers were cultured and isolated and the tests of antibiotic susceptibility were performed by using paper diffusion method.RESULTS In total,214 isolates of 8 species from 191 health care workers were recovered,of which 187 isolates were coagulase-negative Staphylococcus(CNS)(the carriage rate of 93.71%) and 8 isolates were Staphylococcus aureus(the carriage rate of 4.19%).While the total Gram-negative bacteria carriage rate was 14.14%(27 isolates).The most frequent CNS species were S.epidermidis and S.haemolyticus.The antibiotic susceptibility profiles of S.aureus and CNS differed sharply: all 8 S.aureus strains were resistant to penicillin but were fully susceptible to oxacillin,in contrast,most of CNS were resistant to both penicillin and oxacillin.The carriage rate of CNS(60.2%)and Gram-negative bacteria(26.9%)in HCWs of ICU were higher than other HCWs(P

Objective:To investigate the clinical effect of non-intubation anesthesia with ketamine combined with dexmedetomidine for elective surgery after burns in children.Methods:From January 2018 to December 2019, 50 children with burns who underwent elective surgery and were admitted to the Hanchuan People′s Hospital were enrolled and they were divided into the control group and the observation group by random number table, with 25 cases in each group. Both groups were given ketamine 1-2 mg/kg for induction of anesthesia, the control group was given propofol 4 mg/(kg·h) constant-rate pump injection, and the observation group was given dexmedetomidine 1 μg/(kg·h) pump injection for 10 min and then 0.5 μg/(kg·h) to maintain pump injection. The number of basic anesthesia, operation time and intraoperative fluid infusion between the two groups were compared. The mean arterial pressure (MAP), heart rate (HR) and blood oxygen saturation (SpO 2) at enter the operating room (T 1), 1 min before operation (T 2), 3 min after operation (T 3), end of the operation (T 4), recovery (T 5) points in the two groups were recorded and compared. The occurrence of adverse anesthesia reactions in the two groups and postoperative recovery were compared. Results:There was no statistically significant difference in the number of basic anesthesia, operation time, and intraoperative fluid infusion between the two groups ( P>0.05). The levels of MAP and HR did not change significantly at different time points in the control group ( P>0.05); the level of SpO 2 at T 2 and T 3 was lower than that at T 1 and was lower than that in the observation group at the same time point ( P<0.05); the levels of MAP and HR in the observation group at T 2, T 3, T 4, and T 5 were significantly lower than that at T 1, and were lower than that in the control group at the same time point ( P<0.05). The incidence of adverse reactions in the control group was higher than that in the observation group: 24.0%(6/25) vs. 4.0%(1/25), and the difference was statistically significant ( P<0.05); the scores of sedation and restlessness scale in the control group was higher than that in the observation group: (3.14 ± 0.76) scores vs. (1.22 ± 0.41) scores, the scores of the Ramsay score in the control group was lower than that in the observation group: (1.53 ± 0.36) s cores vs.(3.27 ± 30.41) scores, and the differences were statistically significant ( P<0.05). Conclusions:It is safe and effective to use ketamine combined with dexmedetomidine for non-intubation anesthesia during elective surgery after burns in children. The clinical anesthesia effect is significantly better than that of ketamine combined with propofol.

OBJECTIVE: To assess the value of copy number variations (CNVs) and chromosomal karyotyping analysis for patients with intellectual disability/developmental delay (ID/DD). METHODS: Chromosomal karyotype analysis was applied to 530 children diagnosed with ID/DD. Single nucleotide polymorphism array (SNP-array) was further applied for 120 children with unknown etiology. RESULTS: Among the 530 children with ID/DD, 104 (19.62%) were detected with chromosomal abnormalities. For the 120 children analyzed by SNP-array, 44 (36.67%) were detected with CNVs, among which 20 were predicted as pathogenic, 6 as likely pathogenic, 10 as variants of unknown significance, 7 as likely benign,and 1 as loss of heterozygosity. CONCLUSION SNP-array can facilitate delineation of the etiology of patients with ID/DD, which may provide a basis for their prognosis, consultation and clinical intervention.
Child ; Chromosome Aberrations ; DNA Copy Number Variations ; Developmental Disabilities/genetics* ; Humans ; Intellectual Disability/genetics* ; Karyotyping

Objective To discuss the correlation between gastrointestinal symptoms concomitant with chronic migraine and sleep disorders,anxiety and depression.Methods Self-rating Anxiety Scale (SAS),Self-rating Depression Scale (SDS),Pittsburgh Sleep Quality Index (PSQI) and Gastrointestinal Symptom Rating Scale (GSRS) were adopted to conduct comparative analysis on gastrointestinal symptoms,anxiety,depression,sleep disorders,and related risk factors in 151 chronic migraine patients who conformed to International Headache Society International Classification of Headache Diseases-Ⅱ diagnostic code and 151 healthy controls in the Third Affiliated Hospital of Qiqihar Medical University from January 2015 to December 2017.Results PSQI scores (8.46±2.54 vs 4.53±1.95,t=2.913,P＜0.05),SAS scores (53.24± 11.66 vs 39.58±8.63,t=3.112,P＜0.05),SDS scores (51.09±8.80 vs 36.11±5.74,t=3.520,P＜0.05),and GSRS scores (4.53 (3.74,5.32) vs 1.29 (0.73,1.31),Z=30.804,P＜0.05) were all higher in migraine patients than that in healthy controls,and the differences were all statistically significant.In chronic migraine patients,139 (92.05％) had one gastrointestinal symptom at least,and the overall incidence of each gastrointestinal symptom was abdominal distension (60 cases,39.74％),exhaust increase (51 cases,33.77％),and endless defecation (43 cases,28.48％),etc.,in turn.Multiple regression analysis showed that headache degree,frequency,PSQI scores,SAS scores,and SDS scores were the main risk factors of gastrointestinal symptoms concomitant with chronic migraine.GSRS scores of chronic migraine patients presented positive correlation with PSQI scores (r=0.65,P=0.000),SAS scores (r=0.42,P=0.000),and SDS scores (r=0.48,P=0.000),respectively.Conclusion Chronic migraine patients are easy to be accompanied with gastrointestinal symptoms,and headache degree and frequency,sleep disorders,depression and anxiety are the main risk factors of concomitant gastrointestinal symptoms.

Objective:To investigate the characteristics and changes of bacterial infection and drug resistance in PICU at Children′s Hospital of Fudan University from 2016 to 2020.Methods:All the strains were collected at Children′s Hospital of Fudan University from January 1 st, 2016 to December 31 st, 2020.Antimicrobial susceptibility test was carried out according to a unified protocol using Kirby-Bauer method or automated systems.Results were analyzed according to CLSI 2020 breakpoints. Results:(1)Bacterial distribution: 2 551 bacteria were monitored from 2016 to 2020 in our center.The top 3 bacteria were all gram-negative bacteria.Among them, Burkholderia cepacian showed a tortuous downward trend(13.45% to 1.18%), and Klebsiella pneumoniae showed an upward trend(6.05% to 10.61%).The most common infected site was respiratory tract, although the strains in the respiratory tract decreased year by year.Baumanii was the most common bacteria in respiratory infections.Staphylococcus epidermidis was the most common bacteria from 2016 to 2017 in blood infections, but Achromobacter xylosoxidans were became the most common bacteria from 2018 to 2020.Enterococcus faecium was the most common bacteria in urinary infections.(2) Drug resistance: Baumanii had a high drug resistance rate to amikacin, gentamicin, cefepime, and cefitadine, with no obvious changes over the years, which had a gradually decreasing drus resistance rate to cefoperazone sulbactam, showing a tortuous upward trend to imipenem and meropenem.Baumanii and Pseudomonas aeruginosa had a low drug resistance to levofloxacin over the years, but with high resistance rates in 2020.Escherichia coliand and Klebsiella pneumoniae still had high resistance rates to beta-lactam antibiotics, and their resistance rates to levofloxacin were decreasing.Escherichia coli and Klebsiella pneumoniae showed decreasing resistance rates to imipenem and increased resistance rates to meropenem.The resistance rate of Enterococcus faecium to levofloxacin decreased and always showed a high susceptibility rate to polypeptide antibiotics.Neither Staphylococcus epidermidis nor Staphylococcus aureus were currently resistant to tetracycline antibiotics, and the resistance rates of aminoglycoside antibiotics, such as gentamicin, was also declining.Conclusion:The bacterial infection in PICU shows as the main characteristics of respiratory infection and gram-negative bacteria infection.Carbapenem-resistant Enterobacteriaceae bacteria, Enterococci and Staphylococcus species are becoming increasingly more resistant.

Objective:Migraine and tremor share some genetic mutation sites,and clinical studies have also confirmed their correlation.This study aims to explore the clinical and electrophysiological characteristics of migraine patients with concomitant tremor,and to analyze the relevant influential factors of tremor occurrence. Methods:We retrospectively analyzed the clinical data of 217 migraine patients who visited the Third Affiliated Hospital of Qiqihar Medical University from June 2022 to October 2023.The Clinical Rating Scale for Tremor(CRST),Numerical Rating Scale(NRS),Generalized Anxiety Disorder-7(GAD-7),and Patient Health Questionnaire-9(PHQ-9)were respectively used to assess the tremor symptoms,degree of headache,anxiety,and depression of patients.All patients underwent routine head MR scanning and electromyography examination,and were divided into a migraine with tremor group and a migraine without tremor group based on the electromyogram examination. Results:The migraine with tremor group and the migraine without tremor group were included 52 patients(23.96%)and 165 patients(76.04%),respectively.Compared with the migraine without tremor group,the migraine with tremor group had a longer course and duration of headache,higher frequency of headache attacks,higher NRS score,GAD-7 score,and PHQ-9 score,and fewer weekly physical exercises.The differences were statistically significant(all P<0.05).There were no statistically significant differences in the presence or absence of prodromal headache and white matter hyperintensities(WMHs)between the 2 groups(both P>0.05).The evaluation results of the CRST showed that out of 217 migraine patients,39 patients(17.97%)were accompanied by tremors.The electromyographic results showed that all 52 migraine patients with tremors had upper limb tremors,including 28 migraine patients with postural tremors and 24 migraine patients with static tremors.Compared with the migraine patients with static tremors,the migraine patients with postural tremors had lower average frequency,peak frequency,and headache onset frequency(all P<0.05).Multiple linear regression analysis showed that frequency of physical exercise,duration of illness,frequency of headache attacks,NRS score,GAD-7 score,and PHQ-9 score were risk factors for migraine patients with concomitant tremors(all P<0.05). Conclusion:Patients with migraine mainly experience upper limb postural tremors.Reduced physical exercise,long course of disease,long duration of headache,frequent headache attacks,severe headache,anxiety,and depression are risk factors for migraine patients with concomitant tremors.