Objective:To evaluate left ventricular systolic function in patients with systemic scleroderma (SSc) with normal left ventricular ejection fraction using pressure-strain loop (PSL) .Methods:To collect 30 patients with SSc who were treated in the Rheumatology and Immunology Department of Jining Medical University from January 2022 to March 2024 as the observation group, 30 healthy volunteers were selected as the control group after 1:1 matching with the observation group according to the age ±3 years old and the same gender. Clinical and ultrasound data were collected, PSL was used to evaluate and compare the differences between the two groups in left ventricular longitudinal strain (GLS), global work index (GWI), global useful work (GCW), global useless work (GWW) and global work efficiency (GWE), and the statistically significant variables were analyzed by multivariate logistic regression to analyze the independent predictors of early left ventricular function impairment in patients with SSc,and constructed receiver operating characteristic (ROC) curve to analyze the predictive value of GLS, GWI, GCW, GWW and GWE in early left ventricular function impairment in SSc patients.Results:Compared with the control group, the observation group GLS,GWI, GCW and GWE decreased( P<0.05), while the GWW increased( P<0.05). Multivariate logistic regression analysis showed that GLS[ OR(95% CI)=0.51(0.26, 1.02), P=0.055]、GWI[ OR(95% CI)=1.00(0.99, 1.01), P=0.969)、GCW[ OR(95% CI)=1.00(0.99, 1.02), P=0.771]、GWW[ OR(95% CI)=0.90(0.81, 1.01), P=0.075]and GWE[ OR(95% CI)=0.02(0.00, 0.55), P=0.022], in which GWE had the highest significance in predicting left ventricular myocardial work in SSc patients. ROC curve showed that compared with GLS, GWI, GCW and GWW, the area under GWE curve (0.953) was the largest, and the sensitivity of GWE≤94% to predict myocardial damage in SSc patients was 80.0%, and the specificity was 93.3%. The results of the repeatability test showed that the reproducibility of the intra-observer and inter-observer measurements was good. Conclusion:The PSL provides a new method for the quantitative assessment of early left ventricular systolic function impairment in patients with SSc, and GWE can be used as a sensitive index to predict early left ventricular systolic function impairment in patients with SSc.

Objective:To report the nationwide surveillance results of pathogenic profiles and antimicrobial resistance patterns of Gram-positive bloodstream infections in China in 2023.Methods:The clinical isolates of Gram-posttive bacteria from blood cultures were collected in member hospitals of National Bloodstream Infection Bacterial Resistant Investigation Collaborative System（BRICS）during January to December 2023. Antimicrobial susceptibility testing was performed using the dilution method recommended by the Clinical and Laboratory Standards Institute（CLSI）. Statistical analyses were conducted using WHONET 5.6 and SPSS 25.0 software.Results:A total of 4 385 Gram-positive bacterial isolates were obtained from 60 participating center. The top five pathogens were Staphylococcus aureus（ n=1 544，35.2%），coagulase-negative Staphylococci（ n=1 441，32.9%）， Enterococcus faecium（ n=574，13.1%）， Enterococcus faecalis（ n=385，8.8%），and α-hemolytic Streptococci（ n=187，4.3%）. The prevalence of methicillin-resistant Staphylococcus aureus（MRSA）and methicillin-resistant coagulase-negative Staphylococci（MRCNS）was 26.2%（405/1 544）and 69.8%（1 006/1 441），respectively. Notably，all Staphylococci remained susceptible to glycopeptide or daptomycin. Staphylococcus aureus demonstrated excellent susceptibility（>97.0%）to cephalobiol，rifampicin，trimethoprim-sulfamethoxazole，linezolid，minocycline，tigecycline，and eravacycline. No Enterococcus exhibiting resistance to linezolid were detected. Glycopeptide resistance was uncommon but more frequent in Enterococcus faecium（resistance to vancomycin and teicoplanin：both 1.7%）compared to Enterococcus faecalis（both 0.3%）. The detection rates of MRSA and MRCNS exhibited significant regional variations across the country（ χ2=17.674 and 148.650，respectively，both P<0.001）. No vancomycin-resistant Enterococci were detected in central China. Institutional comparison demonstrated higher prevalence of MRSA（ χ2=14.111， P<0.001）and MRCNS（ χ2=4.828， P=0.028）in provincial hospitals than that in municipal hospitals. Socioeconomic analysis identified elevated detection rates of both MRSA（ χ2=18.986， P<0.001）and MRCNS（ χ2=4.477， P=0.034）in less developed regions（per capita GDP

Objective:To report the results of bacterial resistant investigation collaborative system（BRICS）on the distribution and antimicrobial resistance profile of clinical Gram-negative bacteria isolates from bloodstream infections in China in 2023，and provide reference for clinical tretment of bloodstream infections and prevention and control of bacterial resistance.Methods:The clinical isolates of Gram-negative bacteria from blood cultures in member hospitals of BRICS were collected during January 2023 to December 2023. Antibiotic susceptibility tests were conducted by agar dilution or broth dilution methods recommended by Clinical and Laboratory Standards Institute（CLSI）. WHONET 5.6 and SPSS 25.0 were used to analyze the data.Results:During the study period，11 492 strains of Gram-negative bacteria were collected from 60 hospitals，of which 10 098（87.9%）were Enterobacterales and 1 394（12.1%）were non-fermentative bacteria. The top 5 bacterial species were Escherichia coli（50.0%）， Klebsiella pneumoniae（26.1%）， Pseudomonas aeruginosa（5.1%）， Acinetobacter baumannii complex（5.0%）and Enterobacter cloacae complex（4.1%）. The ESBL-producing rates in Escherichia coli， Klebsiella pneumoniae and Proteus mirablilis were 46.8%（2 685/5 741），18.3%（549/2 999）and 44.0%（77/175），respectively. The prevalence of carbapenem-resistant Escherichia coli（CREC）and carbapenem-resistant Klebsiella pneumoniae（CRKP）were 1.3%（76/5 741）and 15.0%（450/2 999）；32.9%（25/76）and 78.0%（351/450）of CREC and CRKP were sensitive to ceftazidime/avibactam combination，respectively. 94.7%（72/76）and 90.2%（406/450）of CREC and CRKP were sensitive to aztreonam/avibactam combination. Furthermore，57.9%（44/76）and 79.1%（356/450）were sensitive to imipenem/relebactam combination. The prevalence of carbapenem-resistant Acinetobacter baumannii（CRAB）complex was 64.6%（370/573），while more than 80.0% of CRAB complex was sensitive to tigecycline，eravacycline and polymyxin B. The prevalence of carbapenem-resistant Pseudomonas aeruginosa（CRPA）was 17.0%（99/581）. There were differences in the composition ratio of Gram-negative bacteria in bloodstream infections and the prevalence of important Gram-negative bacteria resistance among different regions in China，with statistically significant differences in the prevalence of CREC，CRKP，CRPA and CRAB complex（ χ2=10.6，28.6，10.8 and 19.3， P<0.05）. The prevalence of ESBL-producing Escherichia coli， CREC，CRAB complex and CRKP were higher in provincial hospitals than those in municipal hospitals（ χ2=12.5，9.8，12.7 and 57.8，all P<0.01）. Conclusions:Gram-negative bacteria are the main pathogens causing bloodstream infections in China，and Escherichia coli is ranked in the top，while the trend of Klebsiella pneumoniae increases continuously with time. CRKP infection shows a slow upward trend，CREC infecton maintains a low prevalence level，and CRAB complex infection continues to exhibit a high prevalence rate. The composition and resistance patterns of pathogens causing bloodstream infections vary to some extent across different regions and levels of hospitals in China.

Objective:To explore the efficacy of letrozole combined with palbociclib in the treatment of hormone receptor +/human epidermal growth factor receptor-2 - (HR +/HER2 -) advanced breast cancer and its influence on serum thymidine kinase 1 (TK1) and proliferating cell nuclear antigen (Ki67) levels. Methods:A total of 82 patients with HR +/HER2 - advanced breast cancer, all admitted from Jan. 2022 to Jan. 2024 from Department of Oncology, Affiliated Hospital of Jining Medical University, were assigned to the control group ( n=41, letrozole) and the study group ( n=41, letrozole + palbociclib) according to the random number table. The therapeutic effect, tumor markers, immune function and serum TK1 and Ki67 levels were compared between the two groups. Results:The study group higher objective response rate and disease control rate than the other group [14.63% (6/41) and 85.37% (35/41) vs. 0.00% (0/41) and 58.54% (24/41) ] (Continuity correction χ2/χ2=4.50, 7.31, P<0.05). After treatment, carbohydrate antigen 153 (CA153), CA125 and carcinoembryonic antigen (CEA) in the study group were lower than the control group [ (12.17±3.19) U/mL, (23.57±3.35) U/mL and (19.51±4.13) ng/mL vs (24.37±5.25) U/mL, (35.16±5.08) U/mL, (34.28±5.72) ng/mL] ( t=12.72, 12.20, 13.41, P<0.05), serum TK1 and Ki67 levels were also lower [ (3.61±0.75) pmol/L and (7.89±1.16) ng/mL vs. (4.76±0.88) pmol/L and (10.85±1.94) ng/mL] ( t=6.37, 8.39, P<0.05). After treatment, CD3 +, CD4 +, CD4 +/CD8 + higher than the control group [ (48.64±5.88) %, (31.34±4.06) %, (1.22±0.27) vs. (43.16±6.09) %, (27.04±3.35) %, (0.87±0.35) ] ( t=4.15, 5.23, 5.07, P<0.05), while CD8 + was lower [ (25.73±4.11) % vs. (30.94±4.47) %] ( t = 5.49, P<0.05) . Conclusions:Letrozole combined with palbociclib is effective in the treatment of HR +/HER2 - advanced breast cancer and can reduce tumor markers and serum TK1 and Ki67 levels in patients.

Objective:To explore the efficacy of letrozole combined with palbociclib in the treatment of hormone receptor +/human epidermal growth factor receptor-2 - (HR +/HER2 -) advanced breast cancer and its influence on serum thymidine kinase 1 (TK1) and proliferating cell nuclear antigen (Ki67) levels. Methods:A total of 82 patients with HR +/HER2 - advanced breast cancer, all admitted from Jan. 2022 to Jan. 2024 from Department of Oncology, Affiliated Hospital of Jining Medical University, were assigned to the control group ( n=41, letrozole) and the study group ( n=41, letrozole + palbociclib) according to the random number table. The therapeutic effect, tumor markers, immune function and serum TK1 and Ki67 levels were compared between the two groups. Results:The study group higher objective response rate and disease control rate than the other group [14.63% (6/41) and 85.37% (35/41) vs. 0.00% (0/41) and 58.54% (24/41) ] (Continuity correction χ2/χ2=4.50, 7.31, P<0.05). After treatment, carbohydrate antigen 153 (CA153), CA125 and carcinoembryonic antigen (CEA) in the study group were lower than the control group [ (12.17±3.19) U/mL, (23.57±3.35) U/mL and (19.51±4.13) ng/mL vs (24.37±5.25) U/mL, (35.16±5.08) U/mL, (34.28±5.72) ng/mL] ( t=12.72, 12.20, 13.41, P<0.05), serum TK1 and Ki67 levels were also lower [ (3.61±0.75) pmol/L and (7.89±1.16) ng/mL vs. (4.76±0.88) pmol/L and (10.85±1.94) ng/mL] ( t=6.37, 8.39, P<0.05). After treatment, CD3 +, CD4 +, CD4 +/CD8 + higher than the control group [ (48.64±5.88) %, (31.34±4.06) %, (1.22±0.27) vs. (43.16±6.09) %, (27.04±3.35) %, (0.87±0.35) ] ( t=4.15, 5.23, 5.07, P<0.05), while CD8 + was lower [ (25.73±4.11) % vs. (30.94±4.47) %] ( t = 5.49, P<0.05) . Conclusions:Letrozole combined with palbociclib is effective in the treatment of HR +/HER2 - advanced breast cancer and can reduce tumor markers and serum TK1 and Ki67 levels in patients.

Objective:To evaluate left ventricular systolic function in patients with systemic scleroderma (SSc) with normal left ventricular ejection fraction using pressure-strain loop (PSL) .Methods:To collect 30 patients with SSc who were treated in the Rheumatology and Immunology Department of Jining Medical University from January 2022 to March 2024 as the observation group, 30 healthy volunteers were selected as the control group after 1:1 matching with the observation group according to the age ±3 years old and the same gender. Clinical and ultrasound data were collected, PSL was used to evaluate and compare the differences between the two groups in left ventricular longitudinal strain (GLS), global work index (GWI), global useful work (GCW), global useless work (GWW) and global work efficiency (GWE), and the statistically significant variables were analyzed by multivariate logistic regression to analyze the independent predictors of early left ventricular function impairment in patients with SSc,and constructed receiver operating characteristic (ROC) curve to analyze the predictive value of GLS, GWI, GCW, GWW and GWE in early left ventricular function impairment in SSc patients.Results:Compared with the control group, the observation group GLS,GWI, GCW and GWE decreased( P<0.05), while the GWW increased( P<0.05). Multivariate logistic regression analysis showed that GLS[ OR(95% CI)=0.51(0.26, 1.02), P=0.055]、GWI[ OR(95% CI)=1.00(0.99, 1.01), P=0.969)、GCW[ OR(95% CI)=1.00(0.99, 1.02), P=0.771]、GWW[ OR(95% CI)=0.90(0.81, 1.01), P=0.075]and GWE[ OR(95% CI)=0.02(0.00, 0.55), P=0.022], in which GWE had the highest significance in predicting left ventricular myocardial work in SSc patients. ROC curve showed that compared with GLS, GWI, GCW and GWW, the area under GWE curve (0.953) was the largest, and the sensitivity of GWE≤94% to predict myocardial damage in SSc patients was 80.0%, and the specificity was 93.3%. The results of the repeatability test showed that the reproducibility of the intra-observer and inter-observer measurements was good. Conclusion:The PSL provides a new method for the quantitative assessment of early left ventricular systolic function impairment in patients with SSc, and GWE can be used as a sensitive index to predict early left ventricular systolic function impairment in patients with SSc.

Objective:To report the nationwide surveillance results of pathogenic profiles and antimicrobial resistance patterns of Gram-positive bloodstream infections in China in 2023.Methods:The clinical isolates of Gram-posttive bacteria from blood cultures were collected in member hospitals of National Bloodstream Infection Bacterial Resistant Investigation Collaborative System（BRICS）during January to December 2023. Antimicrobial susceptibility testing was performed using the dilution method recommended by the Clinical and Laboratory Standards Institute（CLSI）. Statistical analyses were conducted using WHONET 5.6 and SPSS 25.0 software.Results:A total of 4 385 Gram-positive bacterial isolates were obtained from 60 participating center. The top five pathogens were Staphylococcus aureus（ n=1 544，35.2%），coagulase-negative Staphylococci（ n=1 441，32.9%）， Enterococcus faecium（ n=574，13.1%）， Enterococcus faecalis（ n=385，8.8%），and α-hemolytic Streptococci（ n=187，4.3%）. The prevalence of methicillin-resistant Staphylococcus aureus（MRSA）and methicillin-resistant coagulase-negative Staphylococci（MRCNS）was 26.2%（405/1 544）and 69.8%（1 006/1 441），respectively. Notably，all Staphylococci remained susceptible to glycopeptide or daptomycin. Staphylococcus aureus demonstrated excellent susceptibility（>97.0%）to cephalobiol，rifampicin，trimethoprim-sulfamethoxazole，linezolid，minocycline，tigecycline，and eravacycline. No Enterococcus exhibiting resistance to linezolid were detected. Glycopeptide resistance was uncommon but more frequent in Enterococcus faecium（resistance to vancomycin and teicoplanin：both 1.7%）compared to Enterococcus faecalis（both 0.3%）. The detection rates of MRSA and MRCNS exhibited significant regional variations across the country（ χ2=17.674 and 148.650，respectively，both P<0.001）. No vancomycin-resistant Enterococci were detected in central China. Institutional comparison demonstrated higher prevalence of MRSA（ χ2=14.111， P<0.001）and MRCNS（ χ2=4.828， P=0.028）in provincial hospitals than that in municipal hospitals. Socioeconomic analysis identified elevated detection rates of both MRSA（ χ2=18.986， P<0.001）and MRCNS（ χ2=4.477， P=0.034）in less developed regions（per capita GDP

Objective:To report the results of bacterial resistant investigation collaborative system（BRICS）on the distribution and antimicrobial resistance profile of clinical Gram-negative bacteria isolates from bloodstream infections in China in 2023，and provide reference for clinical tretment of bloodstream infections and prevention and control of bacterial resistance.Methods:The clinical isolates of Gram-negative bacteria from blood cultures in member hospitals of BRICS were collected during January 2023 to December 2023. Antibiotic susceptibility tests were conducted by agar dilution or broth dilution methods recommended by Clinical and Laboratory Standards Institute（CLSI）. WHONET 5.6 and SPSS 25.0 were used to analyze the data.Results:During the study period，11 492 strains of Gram-negative bacteria were collected from 60 hospitals，of which 10 098（87.9%）were Enterobacterales and 1 394（12.1%）were non-fermentative bacteria. The top 5 bacterial species were Escherichia coli（50.0%）， Klebsiella pneumoniae（26.1%）， Pseudomonas aeruginosa（5.1%）， Acinetobacter baumannii complex（5.0%）and Enterobacter cloacae complex（4.1%）. The ESBL-producing rates in Escherichia coli， Klebsiella pneumoniae and Proteus mirablilis were 46.8%（2 685/5 741），18.3%（549/2 999）and 44.0%（77/175），respectively. The prevalence of carbapenem-resistant Escherichia coli（CREC）and carbapenem-resistant Klebsiella pneumoniae（CRKP）were 1.3%（76/5 741）and 15.0%（450/2 999）；32.9%（25/76）and 78.0%（351/450）of CREC and CRKP were sensitive to ceftazidime/avibactam combination，respectively. 94.7%（72/76）and 90.2%（406/450）of CREC and CRKP were sensitive to aztreonam/avibactam combination. Furthermore，57.9%（44/76）and 79.1%（356/450）were sensitive to imipenem/relebactam combination. The prevalence of carbapenem-resistant Acinetobacter baumannii（CRAB）complex was 64.6%（370/573），while more than 80.0% of CRAB complex was sensitive to tigecycline，eravacycline and polymyxin B. The prevalence of carbapenem-resistant Pseudomonas aeruginosa（CRPA）was 17.0%（99/581）. There were differences in the composition ratio of Gram-negative bacteria in bloodstream infections and the prevalence of important Gram-negative bacteria resistance among different regions in China，with statistically significant differences in the prevalence of CREC，CRKP，CRPA and CRAB complex（ χ2=10.6，28.6，10.8 and 19.3， P<0.05）. The prevalence of ESBL-producing Escherichia coli， CREC，CRAB complex and CRKP were higher in provincial hospitals than those in municipal hospitals（ χ2=12.5，9.8，12.7 and 57.8，all P<0.01）. Conclusions:Gram-negative bacteria are the main pathogens causing bloodstream infections in China，and Escherichia coli is ranked in the top，while the trend of Klebsiella pneumoniae increases continuously with time. CRKP infection shows a slow upward trend，CREC infecton maintains a low prevalence level，and CRAB complex infection continues to exhibit a high prevalence rate. The composition and resistance patterns of pathogens causing bloodstream infections vary to some extent across different regions and levels of hospitals in China.

Considerable evidence has been published since the 2020 Korean Cardiopulmonary Resuscitation Guidelines were reported. The International Liaison Committee on Resuscitation (ILCOR) also publishes the Consensus on CPR and Emergency Cardiovascular Care Science with Treatment Recommendations (CoSTR) summary annually. This review provides expert opinions by reviewing the recent evidence on CPR and ILCOR treatment recommendations. The authors reviewed the CoSTR summary published by ILCOR in 2021 and 2022. PICO (population, intervention, comparator, outcome) questions for each topic were reviewed using a systemic or scoping review methodology. Two experts were appointed for each question and reviewed the topic independently. Topics suggested by the reviewers for revision or additional description of the guidelines were discussed at a consensus conference. Forty-three questions were reviewed, including 15 on basic life support, seven on advanced life support, two on pediatric life support, 11 on neonatal life support, six on education and teams, one on first aid, and one related to coronavirus disease 2019 (COVID-19). Finally, the current Korean CPR Guideline was maintained for 28 questions, and expert opinions were suggested for 15 questions.

ObjectiveTo investigate a cluster epidemic of coronavirus disease 2019 （COVID-19） infections in a school in Longchuan County， Yunnan Province， and further guide the prevention and control of COVID-19 in the border area. MethodsAccording to the Protocol on Prevention and Control of Novel Coronavirus Pneumonia （8th Edition）， an epidemiological investigation was performed on all COVID-19 cases to collect the information on demographics， onset， diagnosis and treatment， prognosis， and epidemiological history. Close contacts were also tracked to determine the transmission chains. ResultsIn this cluster epidemic， a total of 37 COVID-19 cases were identified， including 32 females and 5 males aged from 13 to 25 years， who were 35 students and 2 teachers. The student cases were found in four classes of two grades. Furthermore， gene sequencing showed that all cases had been infected with delta variants， belonging to the same transmission chain that was not related to the previous epidemics in Dehong Prefecture. In additionally， a total of 2 127 close contacts were found. After 21 days of centralized quarantine for medical observation， all close contacts tested negative for SARS-CoV-2. In the COVID-19 cases， only one case remained positive for SARS-CoV-2， while the other 36 cases were successfully treated and became negative. ConclusionThis school cluster is caused by the border villagers who contacted the water polluted with SARS-CoV-2. It warrants more strict management of students from border villages and their belongings to prevent similar epidemics in school settings.