Objective To assess the left ventricular synchronization and global systolic function in patients with implanted dual-chamber (DDD) mode cardiac pacemakers by real-time three-dimensional echocardiography(RT-3DE). Methods Left ventricular systolic synchronization and global function were evaluated in 20 patients with implanted DDD mode cardiac pacemakers and 20 normal people by RT-3DE. The left ventricular end-diastolic volume (LEDV), end-systolic volume ( LESV), stroke volume (SV), left ventricular ejection fraction (LVEF), the mean value of time from the start of electrocardiographic QRS wave to the point of minimal systolic volume (Tmean) of the 17 segments and those standard deviation(T-SD),the maximal difference of time among all 17 segments(Tmax) were obtained by RT-3DE. Results Compared with control group, LESV was significantly increased,SV, LVEF were significantly decreased and T-SD,Tmax were significantly prolonged (P <0.01 ). There were no differences in LEDV and Tmean between the two groups (P>0.05). In patients group,LVEF correlated closely with T-SD (r =-0.674, P<0.05) and Tmax (r = - 0. 634, P < 0. 05). Conclusions There were left ventrieular systolic asychronization and global systolic dysfunction in patients with implanted dual-chamber (DDD) mode cardiac pacemakers,which could be assessed by RT-3DE.

Objective To investigate the pathogens distribution in neonatal blood culture and their drug resistance to antibacteri‐al drugs in Dalian City .Methods The routine blood culture ,identification and drug sensitivity test were carried out in the hospital‐ized neonates from August 2014 to August 2015 .And the obtained data were analyzed .Results A total of 186 strains of pathogenic bacteria were detected from 1 570 cases of neonatal blood culture and the positive rate was 11 .8% .Gram positive bacteria accounted for 74 .2% (138/186) and were dominated by Staphylococcus epidermidis .Gram negative bacteria accounted for 25 .3% (47/186) , which were mainly onion burkholderia bacterium .One strain was fungus ,accounting for 0 .5% .The drug sensitivity test results showed that Gram positive bacteria had the higher resistance rate to penicillin and erythromycin (80 .0% -90 .0% ) ,100 .0% sensi‐tivity to vancomycin ,linezolid and teicoplanin ;E .coli and K .pneumoniae had the highest resistance rate to ampicillin (88 .2% -100 .0% ) ,100 .0% sensitivity to imipenem ,amikacin ,low resistance rate to piperacillin/tazobactam ,cefoperazone/sulbactam ,amoxi‐cillin/clavulanic acid ,cefepime and ceftazidime (0% -10 .0% ) .The resistance rate of onion burkholderia bacterium to ticarcillin/clavulanate and meropenem was higher than 80 .0% ,which had 100 .0% sensitivity to cefoperazone /sulbactam ,levofloxacin ,mino‐cycline and compound sulfamethoxazole .Conclusion The neonatal blood culture pathogen in Dalian City is dominated by Gram pos‐itive bacteria ,coagulase negative staphylococcus is the main pathogen .Due to the different regional environmental ,pathogens and drug resistance should be regularly monitored and analyzed to provide objective and accurate basis for clinical rational use of anti‐bacterial drugs .

Objective To probe the diagnostic efficacy of fetal eehocardiography for characterizing complex congenital heart diseases.Methods Fetal echocardiography was performed on 49 cases of fetal complex congenital heart disease, the ultrasonic diagnosis was compared retrospectively with pathological results after autopsy.Results Antenatal sonographic diagnosis was in agreement with the pathological results in 42 cases (85.71 %), 7 cases were disagreed with pathological diagnosis (antenatal sonographic diagnosis was discrepancy in 3 cases, 4 cases were partially mis-classified).Twenty-four cases were combined with extra-cardiac malformations.Nine cases had chromosomal abnormality.Conclusions Fetal echocardiography is highly accurate for antenatal diagnosis of complex congenital heart disease, but it is hard to detect some type of cardiac anomalies.

Objective:To examine the risk factors and predictive value of depression following mild acute ischemic stroke in elderly individuals.The aim is to enhance early identification and intervention, ultimately leading to improved prognosis.Methods:A case-control study was conducted on 988 elderly patients with mild acute ischemic stroke.The study collected general population and social data, as well as clinical laboratory data such as blood glucose, blood lipids, and AD7C-NTP in urine.Additionally, the patients underwent assessments using the Montreal Cognitive Assessment Scale(MoCA), National Institutes of Health Stroke Scale(NHISS), Barthel index(BI), Hamilton Anxiety Scale(HAMA), and Hamilton Depression Scale(HAMD).Based on the HAMD depression scale score, the patients were divided into a nopost-stooke depression(NPSD)group and a post-stooke depression(PSD)group.The study then analyzed the related risk factors and predictive value of PSD.Results:A total of 988 patients were eligible for inclusion, with 132 being excluded and 856 being included.The NPSD and PSD groups showed significant differences in age, hypertension, smoking history, education level, and stroke history(all P<0.05).Regarding clinical data, there were statistically significant differences between the two groups in total cholesterol(TC), triacylglycerol(TG), HDL, urinary AD7C-NTP, MoCA, and HAMA scores(all P<0.05).The results of the multi-factor logistic regression analysis revealed that gender( OR=1.975, 95% CI: 1.223-3.190, P=0.005), stroke history( OR=1.352, 95% CI: 0.877-2.086, P=0.042), and HAMA score( OR=1.216, 95% CI: 0.932-1.526, P=0.043)were identified as independent risk factors for post-stroke depression in the elderly.Conversely, MoCA score( OR=0.873, 95% CI: 0.814-0.937, P<0.001)was found to be an independent protective factor.Furthermore, the ROC curve analysis demonstrated that the HAMA score(AUC=0.892, sensitivity: 0.721, specificity: 0.854, cut-off value: 9.5)exhibited significant predictive value, while the other indexes had limited predictive value. Conclusions:Gender, stroke history, and HAMA score have been identified as potential independent risk factors for post-stroke depression(PSD)in the elderly, while MoCA score may serve as an independent protective factor.Notably, HAMA score demonstrates a strong predictive ability for PSD.Early identification of these factors and timely intervention could significantly contribute to improving prognosis.

Objective:To discuss the quantitative evaluation of left ventricular systolic function in patients with light-chain amyloidosis (AL) by pressure-strain loop (PSL).Methods:Forty-six patients with clinically diagnosed as AL in the Affiliated Tumor Hospital of Zhengzhou University from January 2018 to December 2020 were selected as case group, and they were divided into 2 groups according to whether the thickness of interventricular septum and posterior wall at end-diastole was >12 mm; ①cardiac amyloidosis (CA) group (21 cases, the thickness>12mm); ②non cardiac amyloidosis (NCA) group (25 cases, the thickness≤12 mm). Twenty five healthy volunteers were selected as control group at the same time. Routine echocardiography was performed in all subjects.Two-dimensional dynamic images of the left ventricular apical two-chamber, three-chamber, and four-chamber views were collected for three consecutive cardiac cycles using two-dimensional speckle-tracking. A tracing analysis was conducted and blood pressure was entered on the off-line Echo PAC 203 software, and the left ventricular global longitudinal strain (GLS), peak strain time dispersion(PSD), global myocardial work index (GWI), global constructive work (GCW), global wasted work (GWW) and global work efficiency (GWE) were obtained. The differences of GLS, PSD and myocardial work (GWI, GCW, GWW, GWE) parameters were compared between groups, and Pearson correlation was used to analyze the correlations.Results:①Routine echocardiography: Compared with the control group and NCA group, inter-ventricular septum thickness (IVST), left ventricle posterior wall thickness (LVPWT), left ventricular mass index (LVMI), left atrial diameter (LAD), and E/e′ in CA group were increased, while left ventricular ejection fraction (LVEF) was decreased; ②Compared with the control group, GLS, GWI, and GCW in NCA group were decreased, while there were no statistically differences in GWE, PSD, and GWW between the two groups (all P>0.05); Compared with the control group and NCA group, GLS, GWI, GCW, and GWE were obviously decreased, while PSD and GWW were obviously increased in CA group.③ Correlation analysis showed that: the absolute value of GLS was positively correlated with GWI, GCW and GWE ( r=0.654, 0.695, 0.788; all P<0.001), and negatively correlated with GWW, and PSD ( r=-0.710, -0.625; all P<0.001). Besides, PSD had negative correlation with GWI, GCW and GWE ( r=-0.754, -0.653, -0.702; all P<0.001), and positive correlation with GWW ( r=0.676, P<0.001). Conclusions:PSL can quantitatively evaluate the left ventricular systolic function of AL patients, while the myocardial work parameters are conducive to evaluate the degree of cardiac involvement in the course of AL patients.

Objective:To explore the risk factors for cognitive impairment 3 months after an ischemic stroke and their predictive value.Methods:A retrospective case-control study considered the records of 856 elderly patients who had survived an ischemic stroke. All had been evaluated using the Montreal Cognitive Assessment scale (MoCA). They were divided according to their MoCA scores into a group without cognitive impairment (the PSNCI group) and an impaired (PSCI) group. The subjects′ demographic and clinical laboratory data were compiled. All had been assessed using the National Institutes of Health stroke scale (NIHSS), the Barthel Index (BI), and the Hamilton depression scale (HAMD). Univariate and multivariate logistic regressions were evaluated and a receiver operator characteristics (ROC) curve was computed.Results:There were significant differences between the two groups in terms of gender distribution, age, hypertension and heart disease history, family history of dementia and education level. Moreover, significant differences were observed in the groups′ average total cholesterol (TC), triglyceride (TG), high density lipoprotein (HDL), urinary neurofilament protein (AD7c-NTP), NIHSS scores, BIs and ADL scores. Logistic regression showed that a history of heart disease, urinary AD7C-NTP level and HAMD score were significant independent predictors of cognitive impairment 3 months after a stroke. A high BI was an independent protective factor. The area under the ROC curve for urinary AD7C-NTP was the largest (0.875) and had significant predictive value with a cut-off value of 2.43, sensitivity of 0.94 and specificity of 0.75.Conclusion:Age, sex, education, smoking, drinking, body mass index, a history of heart disease or stroke, a family history of dementia and elevated AD7C-NTP, TC or TG are risk factors for cognitive impairment after a stroke. A high BI suggests a better prognosis. Urinary AD7c-NTP is a useful predictor of PSCI 3 months after a stroke.

Trace amines(TAs)are metabolically related to catecholamine and associated with cancer and neuro-logical disorders.Comprehensive measurement of TAs is essential for understanding pathological pro-cesses and providing proper drug intervention.However,the trace amounts and chemical instability of TAs challenge quantification.Here,diisopropyl phosphite coupled with chip two-dimensional(2D)liquid chromatography tandem triple-quadrupole mass spectrometry(LC-QQQ/MS)was developed to simul-taneously determine TAs and associated metabolites.The results showed that the sensitivities of TAs increased up to 5520 times compared with those using nonderivatized LC-QQQ/MS.This sensitive method was utilized to investigate their alterations in hepatoma cells after treatment with sorafenib.The significantly altered TAs and associated metabolites suggested that phenylalanine and tyrosine metabolic pathways were related to sorafenib treatment in Hep3B cells.This sensitive method has great potential to elucidate the mechanism and diagnose diseases considering that an increasing number of physiological functions of TAs have been discovered in recent decades.

This study aimed to quantitatively assess the effectiveness of the Wuhan lockdown measure on controlling the spread of coronavirus diesase 2019 (COVID-19). : Firstly，estimate the daily new infection rate in Wuhan before January 23，2020 when the city went into lockdown by consulting the data of Wuhan population mobility and the number of cases imported from Wuhan in 217 cities of Mainland China. Then estimate what the daily new infection rate would have been in Wuhan from January 24 to January 30th if the lockdown measure had been delayed for 7 days，assuming that the daily new infection in Wuhan after January 23 increased in a high，moderate and low trend respectively (using exponential, linear and logarithm growth models). Based on that，calculate the number of infection cases imported from Wuhan during this period. Finally，predict the possible impact of 7-day delayed lockdown in Wuhan on the epidemic situation in China using the susceptible-exposed-infectious-removed (SEIR) model. : The daily new infection rate in Wuhan was estimated to be 0.021%，0.026%，0.029%，0.033% and 0.070% respectively from January 19 to January 23. And there were at least 20 066 infection cases in Wuhan by January 23，2020. If Wuhan lockdown measure had been delayed for 7 days，the daily new infection rate on January 30 would have been 0.335% in the exponential growth model，0.129% in the linear growth model，and 0.070% in the logarithm growth model. Correspondingly，there would have been 32 075，24 819 and 20 334 infection cases travelling from Wuhan to other areas of Mainland China，and the number of cumulative confirmed cases as of March 19 in Mainland China would have been 3.3-3.9 times of the officially reported number. Conclusions: Timely taking city-level lockdown measure in Wuhan in the early stage of COVID-19 outbreak is essential in containing the spread of the disease in China.
COVID-19 ; China/epidemiology* ; Cities ; Communicable Disease Control ; Humans ; SARS-CoV-2