Objective To evaluate the association between short-term outcomes and collateral circulation status in patients with acute ischemic stroke receiving thrombolysis therapy.Methods Full-text articles published from January 2000 to November 2016 in Cochrane Library,Medline,Embase and Web of Science electronic database were retrieved and their quality was assessed.The association between short-term outcomes and collateral circulation status were analyzed by random-effects models.Results Twenty three studies involving 2 849 patients were included in quantitative synthesis.The results showed that good collateral circulations had a beneficial effect on favorable outcomes at 3 or 6 months (RR =2.26,95％ CI:1.85-2.77,P =0.00),and were also associated with a lower rate of symptomatic intracranial hemorrhage (RR =0.56,95％ CI:0.47-0.67,P ＜ 0.01) and a lower rate of mortality (RR =0.30,95％ CI:0.22-0.40,P ＜ 0.01).Conclusion The baseline collateral cimulation status is associated with the short-term outcomes in patients with acute ischemic stroke receiving thrombolysis therapy.

To investigate the relationship between plasma lipoprotein a concentration and acute ischemic stroke in young people in Xinjiang.Methods 316 young acute ischemic stroke patients who were hospitalized in the Neurology Center of the First Affiliated Hospital of Xinjiang Medical University from July 2016 to December 2020 were selected as the young stroke group，and 637 young nonstroke patients hospitalized during the same period were randomly selected As a youth nonstroke group. The medical history and clinical data of all subjects were collected，and the relationship between plasma lipoprotein a concentration and the occurrence of acute ischemic stroke in young people was analyzed. Results The plasma lipoprotein a concentration in the youth stroke group［140.55 （208.88）］was significantly higher than that in the youth nonstroke group［95.00 （151.38）］.Comparing the plasma lipoprotein a concentration of the young stroke group and the young nonstroke group according to ethnicity，whether it is Han，Uygur or Kazakh，the plasma lipoprotein a concentration of the young stroke group is higher than that of the young non stroke group（P<0.05）. Multivariate logistic regression analysis indicated that lipoprotein a may be one of the independent risk factors for acute ischemic stroke in young people in Xinjiang（OR=1.601，95%CI 1.342～1.910，P<0.05）. Further explore the relationship between the concentration of plasma lipoprotein a and the occurrence of acute ischemic stroke in Han，Uygur，and Kazakh youths. It shows that the increase of lipoprotein a level in Han youth is significantly related to the occurrence of acute ischemic stroke in young people. 1.751 （95%CI 1.404～2.183，P<0.05）；with the increase of plasma lipoprotein a concentration，acute deficiency The risk of bloody stroke also further increased. The risk ratio of the study population at the highest quartile level to the study population at the lowest quartile level was 4.948 （95%CI 2.528～9.686，P<0.05）.However，in the Uygur and Kazakhs，there is no correlation between the concentration of lipoprotein a and the occurrence of acute ischemic stroke in young people.Conclusion The concentration of plasma lipoprotein a is associated with the occurrence of acute ischemic stroke in young people in Xinjiang. Further exploring the ethnic differences in the correlation，it is found that the plasma lipoprotein a concentration is closely related to the occurrence of acute ischemic stroke in the Han youth，and there is no correlation between the Uyghur and Kazakh youths.