To investigate the clinical value of cardiac magnetic resonance feature tracking (CMR-FT) technology in the assessment of the right ventricle function in patients with immune checkpoint inhibitor (ICIs)-related myocarditis.

Objective To explore the methods and contents of clinical microbiology testing in the"Sansheng"teaching practice in the information age,and guide the cultivation of high-level laboratory technology professionals with comprehensive quality.Methods Through thinking and improving the practice teaching mode of the laboratory department of Qingyuan Hospital Affiliated to Guangzhou Medical University,using the existing curriculum design,combined with the"Internet+education"back-ground,let"Sansheng"have a deeper understanding and application in the study of microbial testing.Results Ideological and po-litical education runs through the whole process of medical practice,which helps to cultivate students'sense of professional identi-ty,belonging and social mission;In the teaching process,the dual planning teaching mode of case-based learning and problem-based learning was introduced.At the same time,the"Internet+"technology was used to carry out diversified teaching.Com-bined with clinical practice,students'ability to analyze and solve problems was significantly improved,and the goal of quality edu-cation was achieved.Conclusion The teaching application of clinical microbiological examination based on the"Internet+"mode can effectively improve the teaching quality,improve the comprehensive ability of students and improve the learning effect.

OBJECTIVE To investigate the effect and mechanism of soluble guanylate cyclase stimulator sGC003F on cardiac function in mice with chronic heart failure(CHF).METHODS C57BL/6J male mice were randomly divided into the sham operation(sham)group,transverse aortic constriction induced CHF mouse model group,model+veliciguat(Ver,3 mg·kg-1)group(positive control)and model+sGC003F(3 and 10 mg·kg-1)group.Four weeks after modeling,drugs were ig given,once a day,for 28 d.Echocardiography was used to measure the changes in cardiac function,and the myocardial hypertrophy related indexes were calculated.The levels of serum N-terminal pro-brain natriuretic peptide(NT-pro-BNP),N-terminal pro-atrial natriuretic peptide(NT-pro-ANP),soluble guanylate cyclase(sGC),cyclic guanosine monophosphate(cGMP)and inflammatory factors interleukin-6(IL-6),tumor necrosis factor-α(TNF-α)and IL-1β were detected by ELISA.The pathological changes of left heart tissue were observed with HE and Masson staining.Image was used to analyze the percentage of fibrosis in cardiac tissus stained with Masson.The activity of superoxide dismutase(SOD),content of malondialdehyde(MDA)in myocardial tissue,and level of nitric oxide(NO)in serum were detected by biochemical detection kits.The protein expression levels of p-mammalian target of rapamycin(p-mTOR),p-protein kinase B(p-Akt),TNF-α and IL-6 in cardiac tissue were detected by Western blotting.RESULTS Com-pared with the sham group,the left ventricular ejection fraction(LVEF)and left ventricular fractional shortening(LVFs)in the model group decreased significantly(P<0.01),the cardiac structure changed significantly,the percentage of myocardial fibrosis increased significantly(P<0.05),so were serum NT-pro-BNP and NT-pro-ANP levels(P<0.01).Compared with the model group,the above indexes of the model+Ver group and the model+sGC003F 3 mg·kg-1 group were significantly improved(P<0.05,P<0.01).The sGC003F 10 mg·kg-1 group had a significant improvement in LVEF,LVFs,and NT-pro-BNP(P<0.01).Compared with the sham group,the serum levels of NO,sGC and cGMP in the model group decreased significantly(P<0.05,P<0.01).Compared with the model group,the serum levels of NO,sGC and cGMP were significantly increased in the model+sGC003F 3 mg·kg-1 group(P<0.01),but only serum cGMP levels were significantly increased in model+Ver and model+sGC003F 10 mg·kg-1 groups(P<0.01).Compared with the sham group,the serum levels of TNF-α,IL-1β and IL-6 in the model group were significantly increased(P<0.05,P<0.01).Compared with the model group,the serum levels of TNF-α,IL-1β and IL-6 were significantly decreased in the model+sGC003F 3 mg·kg-1 group(P<0.05,P<0.01),and only the TNF-α level was significantly decreased in the model+sGC003F 10 mg·kg-1 group(P<0.01).Compared with the sham group,the SOD activity of the model group was significantly decreased(P<0.01),but the MDA content significantly increased(P<0.01).Compared with the model group,SOD and MDA were significantly improved in the model+sGC003F 3 mg·kg-1 group(P<0.05,P<0.01),but in the model+Ver group only the SOD activity significantly increased(P<0.05).Western blotting showed that the expressions of p-mTOR,p-Akt,TNF-α and IL-6 protein in myocardial tissue of the model group were significantly higher than in the sham group(P<0.05).Compared with the model group,the expressions of the above proteins in the model+sGC003F 3 mg·kg-1 group were significantly decreased(P<0.05,P<0.01),so were the expressions of TNF-α protein in the model+sGC003F 10 mg·kg-1 group and model+Ver group(P<0.01).CONCLUSION sGC003F can improve cardiac function,and reduce myocardial fibrosis in CHF model mice,which may be related to the inhibition of myocardial oxidative stress and inflammation,and the regulation of NO/sGC/cGMP and AKT/mTOR signaling pathways.

OBJECTIVE To investigate the anti-fatigue effect of chicory polysaccharide(CP)on mice exposed to simulated hypobaric hypoxia.METHODS Male C57BL/6J mice were randomly divided into the control group,model group,model+CP 150,300 and 600 mg·kg-1 groups.The control and model groups were given normal saline,while the CP groups were given drugs of different doses.After a 14 d pre-administration period,all the mice except the control group were exposed to a simulated alti-tude of 7 000 m in a hypobaric and hypoxic animal experimental chamber.After 7 d,a treadmill fatigue test was conducted to assess exercise endurance.The body weight and organ indexes were evaluated.The pathological changes in organs and tissues were observed via HE staining.The levels of fatigue-related and oxidative stress-related indicators were measured.The expression levels of phosphorylated AMP-activated protein kinase(p-AMPK),peroxisome proliferator-activated receptor gamma coactivator 1-alpha(PGC-1α),and cytochrome c oxidase Ⅳ(COXⅣ)were determined using Western blotting anal-ysis.RESULTS Compared with model group,exercise endurance was significantly enhanced,body weight and organ indexes improved,and pathological damage to the lung,liver and skeletal muscle mitigated in the model+CP 600 mg·kg-1 group.Compared with model group,the model+CP 600 mg·kg-1 group had the contents of serum lactate and blood urea nitrogen reduced,but the contents of glycogen and the activity of superoxide dismutase(SOD)and glutathione peroxidase(GSH-Px)in the liver and skeletal muscle were increased.The malondialdehyde content was lowered,but the expressions of p-AMPK,PGC-1α,and COXⅣ in skeletal muscle were significantly increased.CONCLUSION CP can alleviate altitude-induced fatigue by reducing the metabolite accumulation,increasing glycogen storage,and lowering oxidative stress levels.The underlying mechanism may involve the activation of the AMPK/PGC-1αsignaling pathway.

OBJECTIVE To investigate the effect and mechanism of soluble guanylate cyclase stimulator sGC003F on cardiac function in mice with chronic heart failure(CHF).METHODS C57BL/6J male mice were randomly divided into the sham operation(sham)group,transverse aortic constriction induced CHF mouse model group,model+veliciguat(Ver,3 mg·kg-1)group(positive control)and model+sGC003F(3 and 10 mg·kg-1)group.Four weeks after modeling,drugs were ig given,once a day,for 28 d.Echocardiography was used to measure the changes in cardiac function,and the myocardial hypertrophy related indexes were calculated.The levels of serum N-terminal pro-brain natriuretic peptide(NT-pro-BNP),N-terminal pro-atrial natriuretic peptide(NT-pro-ANP),soluble guanylate cyclase(sGC),cyclic guanosine monophosphate(cGMP)and inflammatory factors interleukin-6(IL-6),tumor necrosis factor-α(TNF-α)and IL-1β were detected by ELISA.The pathological changes of left heart tissue were observed with HE and Masson staining.Image was used to analyze the percentage of fibrosis in cardiac tissus stained with Masson.The activity of superoxide dismutase(SOD),content of malondialdehyde(MDA)in myocardial tissue,and level of nitric oxide(NO)in serum were detected by biochemical detection kits.The protein expression levels of p-mammalian target of rapamycin(p-mTOR),p-protein kinase B(p-Akt),TNF-α and IL-6 in cardiac tissue were detected by Western blotting.RESULTS Com-pared with the sham group,the left ventricular ejection fraction(LVEF)and left ventricular fractional shortening(LVFs)in the model group decreased significantly(P<0.01),the cardiac structure changed significantly,the percentage of myocardial fibrosis increased significantly(P<0.05),so were serum NT-pro-BNP and NT-pro-ANP levels(P<0.01).Compared with the model group,the above indexes of the model+Ver group and the model+sGC003F 3 mg·kg-1 group were significantly improved(P<0.05,P<0.01).The sGC003F 10 mg·kg-1 group had a significant improvement in LVEF,LVFs,and NT-pro-BNP(P<0.01).Compared with the sham group,the serum levels of NO,sGC and cGMP in the model group decreased significantly(P<0.05,P<0.01).Compared with the model group,the serum levels of NO,sGC and cGMP were significantly increased in the model+sGC003F 3 mg·kg-1 group(P<0.01),but only serum cGMP levels were significantly increased in model+Ver and model+sGC003F 10 mg·kg-1 groups(P<0.01).Compared with the sham group,the serum levels of TNF-α,IL-1β and IL-6 in the model group were significantly increased(P<0.05,P<0.01).Compared with the model group,the serum levels of TNF-α,IL-1β and IL-6 were significantly decreased in the model+sGC003F 3 mg·kg-1 group(P<0.05,P<0.01),and only the TNF-α level was significantly decreased in the model+sGC003F 10 mg·kg-1 group(P<0.01).Compared with the sham group,the SOD activity of the model group was significantly decreased(P<0.01),but the MDA content significantly increased(P<0.01).Compared with the model group,SOD and MDA were significantly improved in the model+sGC003F 3 mg·kg-1 group(P<0.05,P<0.01),but in the model+Ver group only the SOD activity significantly increased(P<0.05).Western blotting showed that the expressions of p-mTOR,p-Akt,TNF-α and IL-6 protein in myocardial tissue of the model group were significantly higher than in the sham group(P<0.05).Compared with the model group,the expressions of the above proteins in the model+sGC003F 3 mg·kg-1 group were significantly decreased(P<0.05,P<0.01),so were the expressions of TNF-α protein in the model+sGC003F 10 mg·kg-1 group and model+Ver group(P<0.01).CONCLUSION sGC003F can improve cardiac function,and reduce myocardial fibrosis in CHF model mice,which may be related to the inhibition of myocardial oxidative stress and inflammation,and the regulation of NO/sGC/cGMP and AKT/mTOR signaling pathways.

OBJECTIVE To investigate the role and mechanisms of the soluble guanylate cyclase(sGC)stimulator sGC003 in improving high altitude pulmonary edema(HAPE)in mice.METHODS Mice were randomly assigned to a normal control group,model group,model+dexamethasone 4 mg·kg-1 group(before modeling,intragastric administration of saline was performed once daily for 6 d,followed by intragastric administration of dexamethasone 4 mg·kg-1 on days 7 and 8),model+riociguat 10 mg·kg-1 group(before modeling,intragastric administration once a day for 7 d),and model+sGC003 5 and 10 mg·kg-1 groups(before modeling,intragastric administration once a day for 7 d).All groups except the normal control group received intratracheal instillation of lipopolysaccharide at a dose of 4 mg·kg-11 h after drug administration on day 7,followed by placement in a hypoxic environment to establish the HAPE model.After 24 h of modeling,the expiratory time,end-inspiratory pause,enhanced pause,and breathing frequency were measured,Lung tissue morphology was examined using HE staining,and lung tissue edema was assessed by determining the wet to dry weight ratio(W/D).The level of interleukin-1β(IL-1β)was determined using immunofluorescence staining.The phosphorylation level of vasodilator-stimulated phosphoprotein(VASP)in lung tissue was analyzed by Western blotting.Additionally,levels of sGC,hypoxia inducible factor-1α(HIF-1α),cyclic guanosine monophosphate(cGMP),IL-6,and IL-1βin serum were quantified using ELISA.RESULTS Compared with the normal control group,the model group had obvious pulmonary edema,and the lung W/D,IL-1β levels,expiratory time,end-inspiratory pause,enhanced pause,as well as serum levels of IL-1β,HIF-1α and IL-6 were significantly increased.Concurrently,the frequency of breathing and serum levels of sGC and cGMP were significantly decreased.Compared with model group,the expiratory time,end-inspiratory pause,enhanced pause,lung W/D and IL-1β levels,and serum levels of IL-1β,HIF-1α and IL-6 were significantly decreased in the model+sGC003 10 mg·kg-1 group;while the frequency of breathing,serum sGC and cGMP levels,phosphorylation level of VASP in lung tissues were significantly increased.CONCLUSION sGC003 can improve lung function,suppress pulmonary inflammation,and mitigate pulmonary edema in HAPE mice by activating the sGC/cGMP pathway.

OBJECTIVE To investigate the anti-fatigue effect of chicory polysaccharide(CP)on mice exposed to simulated hypobaric hypoxia.METHODS Male C57BL/6J mice were randomly divided into the control group,model group,model+CP 150,300 and 600 mg·kg-1 groups.The control and model groups were given normal saline,while the CP groups were given drugs of different doses.After a 14 d pre-administration period,all the mice except the control group were exposed to a simulated alti-tude of 7 000 m in a hypobaric and hypoxic animal experimental chamber.After 7 d,a treadmill fatigue test was conducted to assess exercise endurance.The body weight and organ indexes were evaluated.The pathological changes in organs and tissues were observed via HE staining.The levels of fatigue-related and oxidative stress-related indicators were measured.The expression levels of phosphorylated AMP-activated protein kinase(p-AMPK),peroxisome proliferator-activated receptor gamma coactivator 1-alpha(PGC-1α),and cytochrome c oxidase Ⅳ(COXⅣ)were determined using Western blotting anal-ysis.RESULTS Compared with model group,exercise endurance was significantly enhanced,body weight and organ indexes improved,and pathological damage to the lung,liver and skeletal muscle mitigated in the model+CP 600 mg·kg-1 group.Compared with model group,the model+CP 600 mg·kg-1 group had the contents of serum lactate and blood urea nitrogen reduced,but the contents of glycogen and the activity of superoxide dismutase(SOD)and glutathione peroxidase(GSH-Px)in the liver and skeletal muscle were increased.The malondialdehyde content was lowered,but the expressions of p-AMPK,PGC-1α,and COXⅣ in skeletal muscle were significantly increased.CONCLUSION CP can alleviate altitude-induced fatigue by reducing the metabolite accumulation,increasing glycogen storage,and lowering oxidative stress levels.The underlying mechanism may involve the activation of the AMPK/PGC-1αsignaling pathway.

OBJECTIVE To investigate the role and mechanisms of the soluble guanylate cyclase(sGC)stimulator sGC003 in improving high altitude pulmonary edema(HAPE)in mice.METHODS Mice were randomly assigned to a normal control group,model group,model+dexamethasone 4 mg·kg-1 group(before modeling,intragastric administration of saline was performed once daily for 6 d,followed by intragastric administration of dexamethasone 4 mg·kg-1 on days 7 and 8),model+riociguat 10 mg·kg-1 group(before modeling,intragastric administration once a day for 7 d),and model+sGC003 5 and 10 mg·kg-1 groups(before modeling,intragastric administration once a day for 7 d).All groups except the normal control group received intratracheal instillation of lipopolysaccharide at a dose of 4 mg·kg-11 h after drug administration on day 7,followed by placement in a hypoxic environment to establish the HAPE model.After 24 h of modeling,the expiratory time,end-inspiratory pause,enhanced pause,and breathing frequency were measured,Lung tissue morphology was examined using HE staining,and lung tissue edema was assessed by determining the wet to dry weight ratio(W/D).The level of interleukin-1β(IL-1β)was determined using immunofluorescence staining.The phosphorylation level of vasodilator-stimulated phosphoprotein(VASP)in lung tissue was analyzed by Western blotting.Additionally,levels of sGC,hypoxia inducible factor-1α(HIF-1α),cyclic guanosine monophosphate(cGMP),IL-6,and IL-1βin serum were quantified using ELISA.RESULTS Compared with the normal control group,the model group had obvious pulmonary edema,and the lung W/D,IL-1β levels,expiratory time,end-inspiratory pause,enhanced pause,as well as serum levels of IL-1β,HIF-1α and IL-6 were significantly increased.Concurrently,the frequency of breathing and serum levels of sGC and cGMP were significantly decreased.Compared with model group,the expiratory time,end-inspiratory pause,enhanced pause,lung W/D and IL-1β levels,and serum levels of IL-1β,HIF-1α and IL-6 were significantly decreased in the model+sGC003 10 mg·kg-1 group;while the frequency of breathing,serum sGC and cGMP levels,phosphorylation level of VASP in lung tissues were significantly increased.CONCLUSION sGC003 can improve lung function,suppress pulmonary inflammation,and mitigate pulmonary edema in HAPE mice by activating the sGC/cGMP pathway.

Objective To explore the methods and contents of clinical microbiology testing in the"Sansheng"teaching practice in the information age,and guide the cultivation of high-level laboratory technology professionals with comprehensive quality.Methods Through thinking and improving the practice teaching mode of the laboratory department of Qingyuan Hospital Affiliated to Guangzhou Medical University,using the existing curriculum design,combined with the"Internet+education"back-ground,let"Sansheng"have a deeper understanding and application in the study of microbial testing.Results Ideological and po-litical education runs through the whole process of medical practice,which helps to cultivate students'sense of professional identi-ty,belonging and social mission;In the teaching process,the dual planning teaching mode of case-based learning and problem-based learning was introduced.At the same time,the"Internet+"technology was used to carry out diversified teaching.Com-bined with clinical practice,students'ability to analyze and solve problems was significantly improved,and the goal of quality edu-cation was achieved.Conclusion The teaching application of clinical microbiological examination based on the"Internet+"mode can effectively improve the teaching quality,improve the comprehensive ability of students and improve the learning effect.

Objective To explore the clinical features,imaging and pathological characteristics of the patients with congenital liver fibrosis(CHF).Methods The medical case data of 6 patients with pathological-ly diagnosed CHF in this hospital from January 2011 to June 2021 were retrospectively analyzed,and the clini-cal menifastations,laboratory indicators,imaging characteristics,pathological manifestations,treatment and outcomes were summarized.Results The clinical classification in 6 cases of CHF was mainly portal hyperten-sion(66.67％),and the most common clinical manifestations and signs were hepatosplenomegaly(83.33％),melena(50.00％)and abdominal distension(33.33％).Total bil irubin was normal,and only 2 cases(33.33％)were mildly elevated.The prothrombin time was in the normal range in 4 cases(66.67％),and mild abnormality in 2 cases(33.33％).Imaging showed abnormal liver morphology in 6 cases,spleen enlarge-ment in 5 cases(83.33％),portal vein widening in 3 cases(50.00％),diffuse dilatation of intrahepatic bile ducts in 2 cases(33.33％),and complicating Caroli disease in 1 case(16.67％).The pathological manifesta-tions were normal liver parenchymal cells,periportal fibrosis,and manifold-manifold bridging-like fibrosis.Six cases received the conventional liver protection therapy,3 cases underwent splenectomy+pericardia vascular dissection,the median follow-up time was 68.2 months,1 case died due to liver failure,and 5 cases were rela-tively stable.Conclusion The patients with hepatic disease whose portal hypertension is inconsistent to the degree of hepatic function damage,especially those complicating polycystic kidney disease should perfect the liver puncture pathological examination and genetic testing to clarify the diagnosis,and conduct the genetic counseling and intervention treatment as soon as possible.