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Hispidulin(HPDL) chitosan microspheres were prepared in this study to deliver HPDL to the lesion sitevia intravenous injection, and further evaluate their anticancer effects in vitro and the growth inhibition effect on A549 cells spheroids. HPDL chitosan microspheres were prepared by emulsion crosslinking method with chitosan as a drug carrier and the amount of HPDL was determined by high performance liquid chromatography (HPLC). The morphology of microspheres was observed under laser scanning confocal microscope. Additionally, the drug release amount of targeting microspheres was detected by dialysis method. Furthermore, the anti-proliferative effects against A549 lung cancer cells were tested by sulforhodamine B (SRB) method, and the effects of HPDL chitosan micrpsphereson early apoptosis of A549 cellswere determined by flow cytometry. A549 cells tumor spheroids were developed in vitro and then HPDL chitosan microspheres were added. On the 0, 1, 3, 7 d after adding the drugs, the inverted microscope was used to observe the mythologicaland volume changes of A549 cells spheroids. The encapsulation efficiency of HPDL chitosan microspheres was （75.32±0.52）%, and the drug loading amount was （7.76±0.67）%. Meanwhile, the microspheres were round shaped andhad smooth surface. The HPDL chitosan microspheres exhibited stronger inhibitory effects on A549 lung cancer cells. The results of flow cytometry indicated that, the early apoptosis rate of lung cancer A549 cells was （37.0±0.75）% at 24 h cells culture after drug administration. The volume of tumor spheroid was significantly inhibited, which had been shrunk by (50.09±11.06)% after the treatment by drug-loaded microsphere at day 7 as compared with blank group; meanwhile, the cells surface were obviously lysed. The preparation method in this research was simple and practicable, and the microspheres prepared with this method were round and smooth, with high encapsulation efficiency, which can significantly inhibit proliferation of lung adenocarcinoma A549 cells and induce cell apoptosis, and at the same time can cause lysisand death of A549 cell tumor spheroid.
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Objective To evaluate the predictive factors for failure of non-invasive positive pressure ventilation (NIPPV) in immunosuppressed patients with acute respiratory failure (ARF). Methods The clinical data of 118 immuno-deficient patients treated with NIPPV in the respiratory and intensive care unit (RICU) of the First Affiliated Hospital of Xinjiang Medical University from January 2012 to August 2017 were retrospectively analyzed. The patients were divided into a non-endotracheal intubation (ETI) group (n = 62) and ETI group (n = 56) according to whether ETI was performed during the hospitalization period or not. Each observed indicator was analyzed by univariate analysis, and factors leading to failure of NIPPV were further analyzed by Logistic regression. Receiver operating characteristic (ROC) curve was plotted to evaluate the predictive value of risk factors for failure of NIPPV in immunosuppressed patients with ARF. Results The non-intubation rate for NIPPV in immunosuppressed patients was 50.8% (60/118). Compared with the non-ETI group, the body temperature, pH value in the ETI group were significantly increased, the partial pressure of arterial carbon dioxide (PaCO2) was significantly decreased, the ratio of oxygenation index (PaO2/FiO2) < 100 mmHg (1 mmHg = 0.133 kPa), acute physiology and chronic health evaluation Ⅱ(APACHE Ⅱ) score ≥ 20, and the number of cases requiring catecholamine were significantly increased, the mortality was significantly increased. Multivariate Logistic regression analysis showed that the APACHE Ⅱ score ≥ 20 [odds ratio (OR) = 15.274, 95% confidence internal (95%CI) = 2.175-107.252, χ2= 7.516, 1 = 0.006], PaO2/FiO2< 100 mmHg (OR = 0.075, 95%CI = 0.014-0.408, χ2= 8.968, 1 = 0.003), and need for catecholamine (OR = 35.736, 95%CI = 6.974-183.124, χ2= 18.400, 1 < 0.001) were independent risk factors for failure of NIPPV. ROC curve analysis showed that the APACHE Ⅱ score ≥ 20 and PaO2/FiO2< 100 mmHg could predict failure of NIPPV, the area under ROC curve (AUC) of the APACHE Ⅱ score ≥ 20 was 0.787, the sensitivity was 83.93%, the specificity was 69.35%, the positive predict value (PPV) was 71.21%, the negative predict value (NPV) was 82.69%, the positive likelihood ratio (PLR) was 2.74, the negative likelihood ratio (NLR) was 0.23, and Youden index was 0.53; the AUC of PaO2/FiO2< 100 mmHg was 0.757, the sensitivity was 80.65%, the specificity was 66.07%, the PPV was 68.18%, the NPV was 78.85%, the PLR was 2.38, the NLR was 0.29, and Youden index was 0.47. Conclusions 50.8% of immunocompromised and ARF patients treated with NIPPV did not require ETI, which is independent of the etiology of ARF. APACHE Ⅱ score ≥ 20, PaO2/FiO2<100 mmHg, and the need for catecholamine are predictive factors for failure of NIPPV in immunocompromised patients.
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Objective To investigate the prevalence and the related factors of allergic rhinitis in Xinjiang College students.Methods Five universities'students in Urumqi were chosen as the research subjects,the question-naire survey was conducted by the method of cluster sampling,and the results were analyzed.Results 1 609 ques-tionnaires were valid from 2 000 questionnaires.The prevalence rate of allergic rhinitis was 36.8% in the five univer-sities in Urumqi.Prevalence rate increased with grade.The prevalence rates of drinking,regular cleaning nasal cavity, scrubbing their nose in allergic rhinitis were 43.2%,40.7%,53.8% respectively,which were higher than those in not drinking,not regular cleaning nasal cavity,not scrub nose,the differences were statistically significant (χ2 =6.945,9.679,100.845,all P 0.05).Conclusion Allergic rhinitis not only closely related to the grades and the environmental factors,but also has some connections with living habits(drink,clean nasal cavity and scrub noses).