Objective To evaluate the predictive value of CURB-65 score combined with blood urea nitrogen to albumin ratio (B/A) for intensive care unit (ICU) admission and death in adults with community-acquired pneumonia (CAP). Methods A retrospective analysis was performed on 523 patients with CAP hospitalized in the Second Affiliated Hospital of Kunming Medical University from January 2018 to January 2022. According to whether the patients were admitted to ICU, they were divided into an ICU group (n=36) and a general ward group (n=487). The patients were divided into a death group (n=45) and a non-death group (n=478) according to the death situation during hospitalization. Basic data (age, gender, history of underlying diseases, etc.), hospital stay, antibiotic use days, CURB-65 score, white blood cell count (WBC), neutrophil count (NEUT), procalcitonin (PCT), C-reactive protein (CRP), serum albumin (Alb), blood urea nitrogen (BUN), and BUN to Alb ratio (B/A) of the two groups were compared respectively. Receiver operating characteristic (ROC) curve were plotted to evaluate the predictive value of CURB-65 score, B/A, and their combination for death during ICU admission and hospitalization in patients with CAP. Logistic regression was used to analyze risk factors for in-hospital death in the patients with CAP. Results The number of days in hospital, the number of days of antibiotic use, the number of deaths during hospitalization, the proportion of hypertension, diabetes, CURB-65 score, WBC, NEUT, PCT, CRP, BUN and B/A in the ICU group were significantly higher than those in the general ward group. Age, male, combined hypertension, diabetes, coronary heart disease, ICU admission, CURB-65 score, WBC, NEUT, PCT, CRP, BUN and B/A in the death group were significantly higher than those in the non-death group, and Alb in the ICU group and the death group were significantly lower (all P<0.05). Correlation analysis showed that B/A was positively correlated with PCT, CRP, WBC, NEUT and CURB-65 scores (correlation coefficient r values were 0.486, 0.291, 0.260, 0.310, 0.666, all P<0.001). The area under ROC curve of CURB-65 combined with B/A to predict ICU admission and death of CAP patients was 0.862 (95%CI 0.807 - 0.918, sensitivity 91.7%, specificity 66.4%) and 0.908 (95%CI 0.864 - 0.952, sensitivity 93.3%, specificity 75.7%), respectively. Multivariate logistic regression analysis showed that diabetes, high CURB-65 score, low Alb level and B/A≥4.755 mg/g were independent risk factors for death of CAP patients during hospitalization (P<0.05). Conclusions There is a significant correlation between elevated B/A and ICU demand and mortality in CAP patients. Combined use can improve the predictive value of CURB-65 score for ICU admission and mortality in CAP patients.
Objective To investigate the clinical significance of changes in cardiopulmonary function, degree of hypoxia and inflammatory factors in obstructive sleep apnea hypopnea syndrome (OSAHS) patients combined chronic obstructive pulmonary disease (COPD). Methods A retrospective case-control study was conducted on 209 patients with OSAHS admitted from October 2015 to April 2022. The OSAHS patients were divided into an OSAHS-only group, an OSAHS combined with mild COPD group, an OSAHS combined with moderate COPD group, and an OSAHS combined with severe and very severe COPD group based on pulmonary function test. The characteristics of cardiopulmonary function [(pulmonary artery pressure, N terminal pro B type natriuretic peptide (NT-proBNP), forced expiratory volume in the first second to forced vital capacity (FEV1/FVC), percent predicted value of FEV1 (FEV1%pred)], hypoxia indexes [night lowest saturation of pulse oxygen (NL-SpO2), night medial saturation of pulse oxygen (NM-SpO2), saturation of pulse oxygen less than 85% of the time (TS85), diurnal lowest saturation of pulse oxygen (DL-SpO2)], inflammatory factor indicators [procalcitonin (PCT), interleukin-6 (IL-6), hypersensitive C-reactive protein (hs-CRP), neutrophil to lymphocyte ratio (NLR)], and other characteristics were compared separately. The partial correlation analysis and logistic regression were used to analyze the influencing factors of OSAHS with COPD. Results There were statistically significant differences in age, days of hospitalization, cardiopulmonary function indexes, hypoxia indexes and inflammatory factor indexes between the OSAHS combined with COPD group and the OSAHS-only group (all P<0.05). And pulmonary artery pressure, NT-proBNP, TS85, IL-6, and NLR were higher and DL-SpO2, NL-SpO2, and NM-SpO2 were lower in the OSAHS combined with severe and very severe COPD group compared with the OSAHS combined with mild COPD group (all P<0.05). In the partial correlation analysis, FEV1%pred was negatively correlated with pulmonary artery pressure, NT-proBNP, TS85, IL-6, hs-CRP and NLR, and positively correlated with DL-SpO2, NL-SpO2 and NM-SpO2 (all P<0.05). In regression analysis, NLR and TS85 were the main risk factors for OSAHS combined with COPD (all P<0.05). Conclusions OSAHS patients combined with COPD have longer hospital days, greater burden of hypoxia, cardiopulmonary function and inflammation compared with patients with OSAHS alone, especially more significant in patients with poorer pulmonary function, and higher incidence of pulmonary heart disease, atrial fibrillation, and lower limb edema. NLR and TS85 are the main risk factors in patients with OSAHS combined with severe and very severe COPD.
【Abstract】 Objective To compare the properties of collagen membranes before and after crossl inked and to establ ish the foundation of appl ication of collagen membranes. Methods Fresh bovine tendons were separated and collagen was extracted by washing, smashing and acetic acid dissolving. The collagen protein was determined by ultraviolet spectrophotometer and its characteristics were analyzed by SDS-polyacrylamide gel electrophoresis (SDS-PAGE), wavelength scanning and amino acids detecting. Collagen membranes were produced by lyophil ization. And then the biocharacteristics of the membranes before and after glutaraldehyde crossl inked were compared. BMSCs separated from volunteer’s bone marrow were seeded on collagen membranes before and after crossl inked by 2×103 in 100 μL medium, seven days after culture, the absorption spectrum of BMSCs was examined, and BMSCs were observed by scanning electron microscope (SEM). Results The contents of collagen protein were 2 mg/mL. The maximum absorption wave length appeared at about 230 nm. SDS-PAGE suggested that molecularweight of main bands was more than 66.2×103, the same as collagen marker from calf skin. There were 21.47% glycine, 12.04% pral ine and 10.18% hydroxyprol ine. No tryptophan was found. Before crossl inked, collagen membranes were in shape of white sponges and with big holes and the range of pH value was from 4.5 to 5.0. SEM showed reticular conformation and pore structure of collagen membranes, but the bore diameter was bigger. Their water-absorbing capacity was 61 times as much as their weight. The mechanical strength was 210 g/cm3. The dissolution time of collagenase was 90 minutes. After crossl inked, collagen membranes became thin, colorless, semi-transparent and compact with better tenacity. Under SEM, compact collagen fiber appeared reticular. There was lower water-absorbing capacity and pH value ranged from 6.5 to 7.0. The mechanical strength was 3 400 g/cm3 and the dissolution time of collagenase became longer. BMSCs could grow better either on before-crossl inked collagen membranes or on after-crossl inked ones. Conclusion As biomaterial scaffolds, after crossl inked collagen membranes were better than before-crossl inked ones.