Objective To observe the effect of severe heatstroke on intestinal mucosal barrier function,and explore its correlation with systemic inflammatory reaction.Methods The SPF male BALB/c mice were randomly divided into normal control group,40 ℃ heat stress group and 42 ℃ heat stress group,with 6 mice in each group.The mice in normal control group were observed at normal temperature with (25.0 ± 0.5)℃,and the mice in heat stress groups were challenged with a temperature of (35.5 ± 0.5) ℃ and a humidity of (60 ± 5)％ until body temperature increase up to 40 ℃ or 42 ℃ followed by recovering the surroundings temperature to normal temperature for 12 hours.The blood of medial angle of eye of mice in each group was collected for determination of plasma lipopolysaccharide (LPS),tumor necrosis factor-α (TNF-α),interleukin-6 (IL-6) levels,and diamine oxidase (DAO) activity with enzyme linked immunosorbent assay (ELISA).The level of D-lactic acid was determined with ultraviolet spectrophotometer.Then the mice in each group were sacrificed,and mesenteric lymph node (MLN),liver,spleen,lung,kidney tissues,and the blood from portal vein and caval vein were collected for colony count to observe the intestinal bacterial translocation.The ileum tissue was collected for observation of changes in histomorphology and ultrastructure of small intestine mucous membrane with microscope.Pearson linear regression analysis was used to explore the correlation between intestinal mucosal barrier dysfunction and systemic inflammatory response.Results Compared with normal control group,plasma LPS,inflammatory parameters such as TNF-α and IL-6,and gut barrier function parameters such as DAO and D-lactic acid levels as well as the rate of bacterial translocation after heat stress were significantly increased,and the differences were more obvious in 42 ℃ heat stress group [LPS (EU/L):740±50 vs.340±40,TNF-α (ng/L):148.06±36.61 vs.12.89 ± 1.67,IL-6 (ng/L):110.91 ± 9.97 vs.18.02 ± 2.20,DAO (U/L):1 760 ± 400 vs.670± 50,D-lactic acid (mg/L):9.60 ± 1.48 vs.5.08 ± 0.28,rate of bacterial translocation:78.6％ (33/42) vs.9.5％ (4/42),all P ＜ 0.01].It was shown by Pearson linear regression analysis that plasma LPS,TNF-α,IL-6 were positively correlated with DAO activity (r values were 0.834,0.808,0.836,respectively) and D-lactic acid (r values were 0.811,0.811,0.800,respectively) in 42 ℃ heat stress group (all P =0.000).It was showed by microscope that the changes in histomorphology and ultrastructure changes in intestinal mucosa were found after heat stress,and was obvious in 42 ℃ heat stress group as following:villus atrophy and falling off,infiltration of neutrophils and lymphocytes,the microvillus on the surface of mucosa cells were short and small,arranged in disorder,the tight junction between epithelial cells became widen,the mitochondrion and endoplasmic reticulum swelled obviously.Conclusion During the early stage of severe heatstroke,the damage of intestinal mucosal was obvious,and it has close correlation with systemic inflammatory response.

Objective:To investigate the predictive value of heparin binding protein (HBP) for sepsis.Methods:From June 2019 to December 2020, 188 patients admitted to the department of emergency of Hunan Provincial People's Hospital were enrolled. The patients were divided into non-sepsis group (87 patients) and sepsis group (101 patients) according to Sepsis-3 criteria. Gender, age, white blood cell count (WBC), C-reactive protein (CRP), procalcitonin (PCT), HBP, sequential organ failure assessment (SOFA) score, quick SOFA (qSOFA) score, modified early warning score (MEWS) and patients' recent medication history were recorded, the differences in the above indicators between the two groups were compared. The risk factors of sepsis were analyzed by Logistic regression. Spearman correlation analysis was used to analyze the correlation between HBP, PCT, CRP and SOFA score to evaluate the predictive value of HBP, PCT and CRP for the severity of septic organ failure. Receiver operating characteristic curve (ROC curve) were drawn to evaluate the diagnostic value of HBP, PCT and CRP for sepsis.Results:Compared with the non-sepsis group, the sepsis group had significantly higher levels of HBP, PCT, CRP, WBC, SOFA score, qSOFA score, and MEWS [HBP (μg/L): 55.46 (24.57, 78.49) vs. 5.90 (5.90, 9.01), PCT (μg/L): 6.83 (1.75, 30.64) vs. 0.23 (0.12, 0.75), CRP (mg/L): 67.35 (26.23, 123.23) vs. 4.45 (2.62, 47.22), WBC (×10 9/L): 11.84 (7.18, 16.06) vs. 6.58 (5.47, 8.99), SOFA score: 6 (4, 8) vs. 0 (0, 0), qSOFA score: 2 (1, 3) vs. 0 (0, 1), MEWS: 4 (3, 6) vs. 1 (0, 2)], the length of hospital stay was significantly prolonged [days: 10 (4, 17) vs. 0 (0, 7)], and the mortality was significantly increased [29.7% (30/101)vs. 4.6% (4/87)], with statistical significance (all P < 0.05). Correlation analysis showed that HBP, PCT and CRP were significantly positively correlated with SOFA score ( r values were 0.60, 0.33, and 0.38, respectively, all P < 0.01), among which HBP had the strongest correlation, CRP was the second, and PCT was the weakest. Logistic regression analysis showed that HBP, PCT and CRP levels were independent risk factors for sepsis [odds ratio ( OR) were 1.015, 1.094, 1.067, 95% confidence intervals (95% CI) were 1.007-1.022, 1.041-1.150, 1.043-1.093, all P < 0.01]. ROC curve analysis showed that HBP, PCT and CRP all had some diagnostic value for sepsis [the area under ROC curve (AUC) were 0.92, 0.87, 0.80, 95% CI were 0.88-0.97, 0.82-0.92, 0.74-0.87, respectively, all P < 0.01]. Among them, the diagnostic efficacy of HBP was higher when the cut-off value was ≥15.11 μg/L, its sensitivity and specificity were 86.14% and 89.66%, respectively, which were higher than the sensitivity (81.19%) and specificity (80.46%) when the PCT cut-off value was≥ 1.17 μg/L. However, CRP had the best sensitivity of 94.06% for the diagnosis of sepsis but lacked of specificity (63.22%). Conclusion:HBP can be used as a biological indicator for predicting sepsis and can assess the severity of organ failure in septic patients.

Objective:To analyze the influence of factors before initiation of extracorporeal cardiopulmonary resuscitation (ECPR) on the prognosis of patients, so as to explore the intervention timing and improvement strategy of ECPR.Methods:A retrospective analysis was performed on 29 patients who underwent ECPR in the First Affiliated Hospital of Hunan Normal University (Hunan people's Hospital)from July 2018 to April 2021. Patients were divided into the survival group ( n = 13) and death group ( n = 16) according to whether they survived at discharge. The duration of conventional cardiopulmonary resuscitation (CCPR), initial heart rate before ECPR, the ratio of out-of-hospital cardiac arrest (OHCA) and in-hospital cardiac arrest (IHCA), and the ratio of transported cases outside the hospital were compared between the two groups. According to different CCPR time, the patients were divided into the ≤45 min group, 45-60 min group and >60 min group to compare the hospital survival and sustained return of spontaneous circulation (ROSC) rate . According to the location of cardiac arrest, the patients from emergency department and other department were divided to compare the survival of IHCA. Results:The total survival rate was 44.83%, the average duration of extracorporeal membrane oxygenation (ECMO) was 114 (33.5, 142.5) h, and the average duration of CCPR time was 60 (44.5, 80) min. The duration of ECMO was longer in the survival group than in the death group ( P = 0.001). The duration of CCPR (the time from CPR to ECMO) in the survival group was significantly shorter than that in the death group ( P = 0.010). Patients with defibrillatory rhythm had higher hospital survival rate ( P = 0.010). OHCA patients had higher mortality than IHCA patients ( P = 0.020). Mortality of patients transferred from other hospitals was higher ( P = 0.025). Hospital survival and ROSC decreased in turn by CCPR duration ≤ 45 min, 45-60 min, and > 60 min ( P = 0.001). The location of CA occurrence had no impact on the hospital survival rate of IHCA patients ( P=0.54). Conclusions:Hospital survival of ECPR is higher than that of CCPR. ECPR is effective for refractory cardiac arrest. The prognosis of ECPR is significantly related to the duration of CCPR, initial heart rate, and location of CA. Education and team training should be strengthened to improve the survival rate of ECPR.