Multiple myeloma (MM) remains an incurable disease at present. In past decade, the efficacies of treatment and patients' survivals have been greatly improved due to the application of high dose chemotherapy followed by stem cell transplantation, novel agents and their combinations. To further improve the outcomes of patients with MM, we should emphasize on exploration of the new treatment strategies, individualization of regimens and development of new targets.

Objective To investigate the effects of lipoxin A4 (LXA4) on the inflammatory response to focal cerebral ischemia-reperfusion(I/R) inmy in rats.Methods Fifty-six healthy male SD rats weighing 200-250 g were randomly divided into 3 groups:group Ⅰ sham operation(group S,n=8);group Ⅱ cerebral I/R(n=24)and group Ⅲ lipoxin A4+I/R(group LXA4,n=24).Right mid-cerebral artery was occluded for 2 h by inserting cranially a nylon thread with rounded tip into internal carotid artery.LXA4 0.03 nmol/5 μl was injected into cerebral ventricle at 5 min after cerebral ischemia.Neurological deficit was scored at 24 h of reperfusion.Then four animals in each group were killed and their brains were removed for microscopic examination and expression of MPO at 24 h of reperfusion.Meantime,content of IL-1β,TNF-α,TGF-β1,and IL-10 in the brain tissue were measured at 1,6,12,24 and 48 h of reperfusion by ELISA.Glial cell activity was examined at 24 h of reperfusion by immuno-histochemistry.Results Intra-cerebroventricular administrated LXA4 0.03 nmol/5 μl provided mild neuroprotection against focal cerebral I/R injury,improved neurological deficits,and reduced morphological brain damages and PMN infiltration.LXA4 also decreased the content of TNF-α and IL-1β,and increased the content of IL-10 and TGF-β1.The numbers of activated astroglia and microglia were decreased in group LXA4 compared with group I/R.Conclusion LXA4 protects the brain against I/R injury by inhibiting inflammatory response.

Objective To investigate the effect of lipoxin A4(LXA4) on inflammatory response in a rat model of permanent focal cerebral ischemia (PFCI). Methods Seventy-two adult male SD rats weighing 200-250 g were randomly divided into 3 groups (n = 24 each):group Ⅰ sham operation (group S); group Ⅱ PFCI and group Ⅲ LXA4. PFCI was induced by thread occlusion of right middle cerebral artery according to the method described by Longa in group Ⅱ and Ⅲ. In group Ⅲ LXA4 100 ng/5 μl was injected into right ventricle of the brain after PFCI was successfully induced, while in group Ⅰ and Ⅱ equal volume of normal saline was injected instead of LXA4. Six animals were killed at 6, 12 and 24 h of ischemia. Their brains were immediately removed for microscopic examination and determination of myeloperoxidase (MPO) activity, TNF-α, IL-10 and transforming growth factor-β1 (TGF-β1) contents in the ischemic cortex. The expression of glial fibrillary acidic protein (GFAP)was measured by immuno-histochemistry. Apoptosis in neurons was assessed using TUNEL. Results PFCI significantly increased MPO activity, TNF-α, IL-10 and TGF-β1 contents and GFAP expression in the ischemic cortex and neuronal apoptosis in group Ⅱ as compared with group S. LXA4 significanfly decreased MPO activity,TNF-α content, GFAP expression and neuronal apoptosis and increased IL-10, TGF-β1 contents at 12,24 h of ischemia. LXA4 significantly ameliorated PFCI-induced cerebral histopathologic damage. Conclusion LXA4 can protect the brain against PFCI injury by inhibiting inflammatory response.

Objective To investigate the effect of lipoxin A4 ( LXA4 ) on the permeability of blood-brain barrier (BBB) after focal cerebral ischemia-repeffnsion (I/R) in rats. Methods Fifty-four adult male SD rats weighing 200-250 g were randomly divided into 3 groups ( n = 18 each): group Ⅰ sham operation (group S); group Ⅱ focal cerebral I/R ( group I/R) and group Ⅲ LXA4 ( group L). Focal cerebral I/R was produced by middle cerebral artery occlusion (MCAO) with a 4-0 nylon thread with rounded tip inserted into right internal jugular vein and threaded cranially in group Ⅱ and Ⅲ . In group Ⅲ LXA4 100 ng was injected into right lateral ventricle of the brain after MCA was successfully occluded. MCAO was maintained for 2 h. The neurological deficit was evaluated and scored (0 = no deficit, 5 = death) at 24 h of reperfusion. 2% Evans blue 4 ml/kg was injected via femoral vein at 1 h before the animals were sacrificed. The animals were killed and their brains were immediately removed for determination of brain water content, Evans blue content and expression of matrix metalloproteinase-9 (MMP-9)in the ischemic cortex. Results The neurologic deficit scores, the brain water and Evans blue content and MMP-9 protein expression in the cortex were significantly higher in I/R group than in S group. The cerebral I/R-induced changes were significantly attenuated in LXA4 group. Conclusion LXA4 can protect blood-brain barrier against cerebral I/R injury by inhibiting MMP-9 protein expression in the brain tissue.

Aim To investigate the protective effect of lipoxin A4(LXA4)on ischemic brain injury in a rat model of permanent focal cerebral ischemia.Methods Adult male Sprague-Dawley rats weighing 200～250 g were used and rats were randomly divided into four groups:sham group,ischemia alone group,LXA4 10 ng group and LXA4 100 ng group.Permanent focal cerebral ischemia was induced by improved thread occlusion of right middle cerebral artery.Approximately 10 mm of nylon surgical thread was inserted into the right internal carotid artery in the rats of sham group.After the middle cerebral artery occlusion,the same volume of LXA4(5 ?l)or isotonic Na chloride(5 ?l)was injected respectively into the right lateral ventricle of the rat in 10 minutes.After 24 h of ischemia,the neurological deficit and the infarct volume were assessed by the method of Longa's score and 2,3,5-triphenyltetrazolium chloride(TTC)staining;the levels of malondialdehyde(MDA)and actvities of myeloperoxidase(MPO)in the ischemia cortex were measured by spectrophotometer;the contents of tumor necrosis factor-?(TNF-?)and interleukin-1?(IL-1?)were assayed by ELISA method.The histopathological change was observed after HE staining.Results Treatment with LXA4 10 ng or 100 ng significantly improved functional recovery,reduced relative infarction volume,inhibited MPO activity,decreased MDA,TNF-? and IL-1? levels,and improved histopathological injury.Moreover,the effects of neurological recovery and decreasing TNF-? level in LXA4 100 ng group were better than those in 10 ng group.Conclusion Treatment with LXA4 protects against permanent focal cerebral ischemia injury in rats.

Objective:To investigate the overall clinical performance of nursing students and analyze its influencing factors to provide evidence for the improvement.Methods:A questionnaire survey was carried out among 288 nursing students from Qilu Hospital of Shandong University in March to May 2020. The survey included a general data questionnaire, Holistic Clinical Assessment Tool, Clinical Learning Environment, Supervision and Nurse Teacher evaluation scale, Medical Student Safety Attitudes and Professionalism Survey of nursing students. The factors associated with overall clinical performance of nursing students were analyzed by t test, analysis of variance, Pearson correlation analysis and multiple linear regression. Results:The total score of Holistic Clinical Assessment Tool was 114.95 ± 22.91. The total score of Clinical Learning Environment, Supervision and Nurse Teacher evaluation scale was 156.70 ± 26.98. The total score of Medical Student Safety Attitudes and Professionalism Survey was 123.65 ± 31.00. The influencing factors included social practice experience and clinical learning environment, which accounted for 28.0% of the total variation of overall clinical performance of nursing students.Conclusions:Educators and managers of nursing students' schools and internship hospitals should actively explore the educational reform practice to promote the improvement of clinical ability, so as to promote the improvement of the overall clinical ability of nursing students.

Enteral nutrition plays an irreplaceable role in the nutritional treatment of critically ill patients. In order to help clinical medical staff to manage the common complications during the implementations of enteral nutrition for critically ill patients, the consensus writing team carried out literature retrieval, literature quality evaluation, evidence synthesis. Several topics such as diarrhea, aspiration, high gastric residual volume, abdominal distension, etc. were assessed by evidence-based methodology and Delphi method. After two rounds of expert investigations, Expert consensus on prevention and management of enteral nutrition therapy complications for critically ill patients in China (2021 edition) developed, and provided guidance for clinical medical staff.

Depression is a common mental illness in the elderly, which is associated with compromised quality of life, disability, suicide risk and mortality.Drug treatment of late-life depression has large adverse reactions and is prone to drug resistance.Therefore, non-pharmacological interventions have gradually become a research hotspot.This paper reviewed the research progress of non-pharmacological interventions of late-life depression at home and abroad in recent years, and provides a theoretical basis for further research on effective treatment of late-life depression.