MicroRNAs (miRNAs) are endogenous,small,non-coding,single-stranded RNA molecules,which can specifically bind to the 3'-terminal non-coding regions of mRNA chain to induce posttranscriptional gene silencing effect and regulate the expression of mRNA.Recent studies have shown that miRNAs have extensively involved in various pathophysiological processes,including atherosclerosis,cerebral ischemia and hypoxia tolerance,cerebral edema,neuronal cell death,suggesting miRNAs may be used as biological markers of the early diagnosis of ischemic stroke and the biological target of early treatment.This article reviews the biological characteristics of miRNAs,its relationship with ischemic stroke and mechanism of action in order to provide new evidence and ideas for miRNAs in the diagnosis and treatment of ischemic stroke.

Unstable plaque is one of the major sources of microemboli.The microembolic signals indicate that the patients had unstable plaques and are prone to cerebral infarction recently.A series of adhesion molecules involved in the regulation of inflammatory response and functional changes of cerebral microcirculation during ischemic brain injury.The interaction among the adhesion molecules is conducive to leukocyte adhesion,migration,and platelet aggregation,thereby promoting inflammatory response and thrombosis.Recent studies have indicated that adhesion molecules are closely correlated with the instability of atherosclerotic plaques,which may have involved in the formation process of microemboli.The further study of adhesion molecules and microemboli contributes to implementation of drug intervention.It has a positive significance for the prevention and treatment of cerebral ischemia.

Since 1990, the microembolic monitoring technology has been widely used in clinical practice and some progress has been made. This article reviews the new advances achieved in recent years, the problems facing and the direction of new development for microembolic monitoring in clinical research.

Objective To investigate the change of serum matix metalloproteinase-2(MMP-2) level and its significance in patients with acute ischemic stroke of different subtypes. Methods Seventy-seven patients with acute ischemic stroke were classified into large-artery atherosclerosis (LAA) (n =29, 37. 66% ), small artery occlusion (SAO, lacunar infarction) (n =23, 29.87%), cardioembolism (CE) (n = 13,16. 88%), stroke of undemonstrated etiology (SUE) (n = 7, 9.09% ), and stroke of other demonstrated etiology (SOE) (n = 5, 6. 49%) according to the TOAST criteria. Enzyme-linked immunosorbent assay (ELISA) was used to detect the levels of serum MMP-2 in patients with acute ischemic stroke at 24 hours and 7 days, and they were compared with 42 controls. Results The serum MMP-2 levels at 24 hours and 7 days of the onset of symptoms in the acute ischemic stroke group according to the TOAST criteria were 189. 55 ±24.79 and 307.46 ±84. 16 ng/ml respectively, and they were all significantly higher than 159.76 ± 10. 32 ng/ml in the control group (all P <0.05). Among all the TOAST subtypes, SOE and SUE were not analyzed because of the small numbers of cases; among other subtypes, the serum MMP-2 levels at 24 hours of the onset of symptoms in the LAA, SAO and CE groups were 218. 60 ± 13.42,175.21 ±9.92, and 167.26 ±9.7 ng/ml respectively, and they were all significantly higher than those in the control group (all P < 0. 05); at day 7 of the onset of symptoms they were 404.75 ± 10. 30, 293.18 ± 10.91, and 211.81 ±11.14 ng/ml respectively, and they were also significantly higher than those in the control group (all P < 0.05). Among those, the LAA group was increased significantly (P < 0. 01). Conclusions The serum MMP-2 levels were increased in patients with acute cerebral infarction. "l'ne changes of the serum MMP-2 levels in each TOAST subtype group were different. The LAA group increased most significantly, which supported the different views of the etiology of cerebral infarction subtypes. The serum MMP-2 plays an important role in the process of cerebral infarction of the LAA type.

Objective To investigate the correlation between lipoprotein-associated phospholipase A2 (Lp-PLA2) gene R92H polymorphism and ischemic stroke and its subtype in a Chinese Han population of Shandong province. Methods A total of 386 patients w ith first-ever ischemic stroke and 368 healthy controls in China Shandong region w ere enrol ed. According to the TOAST criteria, the patients w ere further divided into large artery atherosclerosis (LAA) and smal artery occlusion (SAO). Enzyme linked immunosorbent assay w as used to detect the serum Lp-PLA2 level. Polymerase chain reaction and directly sequencing w ere used to detect R92H gene polymorphism. Results The serum Lp-PLA2 levels in the ischemic stroke group, LAA group and SAO group w ere higher than that in the control group, and there w ere significant differences (al P<0.01). The distribution frequencies of GA (P=0.006), AA (P=0.020), AA+AG (P=0.009), and A al ele (P=0.001) in the ischemic stroke group w ere significant higher than those in the control group. There w ere also significant differences in distribution frequencies of GA+AA genotype (P=0.007) and A al ele (P<0.001) betw een the LAA group and the control group, w hile the SAO group w as not the case. Multivariate logistic regression analysis showed that GA+ AA genotype (odds ratio [OR] 1.43, 95%confidence interval [CI] 1.02-2.00; P=0.029), GA genotype (OR 1.42, 95%CI 1.01-2.00; P=0.037), and A alele (OR 1.44, 95%CI 1.11-2.18; P=0.028) were the independent risk factors for ischemic stroke. GA+AA genotype (OR 1.73, 95%CI 1.18-2.55; P<0.001) and GA genotype (OR 1.67, 95%CI 1.13-2.48; P<0.001) w ere the independent risk factors for LAA, and they w ere not significantly independent correlated w ith SAO. Conclusions The serum Lp-PLA2 levels increased in patients w ith ischemic stroke, and they increased most significantly in the LAA group. The R92H gene polymorphism might be associated w ith the susceptibility of ischemic stroke in a Chinese Han population of Shandong province.

Objective To observe the analgesia effect of combination of continuous femoral nerve block and oral analgesics after total knee arthroplasty and the impact on early rehabilitation of knee.Methods Sixty patients scheduled for unilateral total knee arthroplasty were randomly divided into two groups.One group was the multimodal analgesia group (group M)and the other was patient controlled intravenous analgesia group (PCIA)(group Ⅰ),30 patients in each group.In group M, patients were given celecoxib (200 mg,bid)and oxycodone (10 mg,bid)two days before operation, then received continuous femoral nerve block followed by oral acetaminophen (100 mg,tid)and oxyc-odone (20 mg,bid)three days after operation.In group I,patients took no medicine before operation and only received PCIA after operation.The two groups were compared with postoperative visual ana-logue scale(VAS)scores at 6,12,24,48 h at rest,during active training and continuous passive movement,range of motion of the knee joint during active training and continuous passive movement, the first time of ambulation,length of hospital stay,range of motion of the knee joint at hospital dis-charge and the incidence of complications.Intravenous dezocine 5 mg was given when VAS score was higher than 5,which was recorded.Results Compared with group Ⅰ,the VAS scores at rest,during active and continuous passive movement at postoperative 6,12,24,48 and 72 h in group M were de-creased significantly (P <0.05).The range of motion of the knee joint during active training and con-tinuous passive movement at postoperative 24,48 and 72 h in group M was increased significantly(P<0.05).The first time of ambulation(2.5±0.8)d and length of hospital stay(9.1±2.3)d in group M were shorter significantly than the first time of ambulation (3.3 ±0.7)d and length of hospital stay (10.8±2.0)d in group I (P <0.05 ).The range of motion of the knee joint(95.6 ± 1 7.2)°in group M at hospital discharge was greater significantly than the range of motion of the knee joint (82.5± 1 5.2 )° in group I (P < 0.05 ).The incidence of nausea and vomiting (3.3%),uroschesis (6.7%)in group M was lower significantly than the incidence of nausea and vomiting (30.0%), uroschesis (26.7%)(P < 0.05 ).Additional use dezocine (3.3%)was lower significantly than additional use dezocine (40.0%)(P <0.05).Conclusion Compared to patient controlled intravenous analgesia,combination of continuous femoral nerve block and oral analgesics can effectively alleviate postoperative pain in patients undergoing total knee arthroplasty,which is beneficial to early postop-erative knee function recovery.

[ Abstract] Vitamin D is a steroid derivative. It has the effect of regulating calcium -phosphorus metabolism. With the development of medicine, the effects of vitamin D in other respects, such as regulation of blood pressure, blood glucose, nerve protection, and immunity have received more and more attention. A lot of research show s that the level of vitamin D is closely associated w ith the onset and outcome of ischemic stroke. In addition, some researchers explored the relationship betw een vitamin D and stroke from the genetic perspective. How ever, the existing research results are not consistent. The link betw een vitamin D and ischemic stroke is not clear. This article review s the correlation studies of the relationship among vitamin D and vitamin D receptor gene polymorphism, the onset of ischemic stroke, outcomes and risk factors in recent years.

0.05).Conclusions Plasma fibrinogen level is affected by -148C/T polymorphism of ?-fibrinogen gene. High plasma fibrinogen level is a risk factor for ACI in Chinese young adults. With other risk factors and environmental factors, T allele increases plasma fibrinogen level and may be a heritable risk factor for ACI in Chinese young adults.

As one of the leucine-rich repeat protein family members, leucine-rich α-2 glycoprotein 1 (LRG1) affects many diseases by transforming growth factor (TGF)-β signaling pathway, and is closely associated with angiogenesis, endothelial cell apoptosis and autophagy, inflammatory reaction and blood-brain barrier damage after cerebral ischemia. It is expected to become a new marker and therapeutic target of ischemic stroke. However, at present, there are few studies on investigating the relationship between LRG1 and ischemic stroke, and the understanding of its molecular mechanism is not yet complete, resulting in controversy about the role of LRG1 in ischemic stroke. Therefore, this article reviews the research progress of LRG1-TGF-β signaling pathway and ischemic stroke, hoping to provide new ideas for the early diagnosis, prevention and treatment of ischemic stroke.

Objective To study the regional cerebral glucose utilization with 18 F-fluorodeoxyglucose (FDG) PET and to investigate the correlation between cerebral glucose metabolism and the clinical characteristic of progressive supranuclear palsy (PSP).Methods A total of 13 patients with PSP and 30 matched healthy controls were performed 18F-FDG PET imaging at rest state.Visual inspection and statistical parametric mapping (SPM) were used to investigate regional cerebral metabolic rate of glucose (rCMRglc).Results Based on the visual inspection,PET imaging in the PSP patients showed that the focal hypometabolic areas mainly included the bilateral frontal cortex,midbrain and subcortical structures.Compared to the controls,voxel-based analysis showed that the regional glucose metabolism decreased in bilateral superior,middle frontal gyrus,cingulate gyrus,midbrain and subcortical structures including basal ganglion and thalamus,which were consisted with the clinical characteristics,such as vertical gaze palsy,pseudobulbar palsy,postural instability,axial rigidity,dementia and so on.Conclusion 18 F-FDG PET imaging is helpful for the early diagnosis of PSP.