Objective To investigate hemorrhagic transformation (HT) and outcomes in acute ischemic stroke.Methods The demographics,vascular risk factors,imaging and other clinical data in patients with acute ischemic acute were collected retrospectively and compared.Using the susceptibility weighted imaging (SWI) to diagnose HT,and the patients were divided into either a HT group or a non-HT group.The modified Rankin scale was used to evaluate the clinical outcomes.Multivariate logistic regression analysis was used to determine the independent risk factors for HT and poor outcome in HT patients.Results A total of 96 patients with acute ischemic stroke were enrolled and 34 of them had HT (35.4％).The age (66.21 ± 7.04 years vs.61.21 ±13.42 years; t =2.020,P=0.046) and infarct volume (3.88 ±2.20 cm3 vs.1.96 ± 1.37 cm3; t =5.67,P=0.001) in the HT group were significantly older or larger than those in the non-HT group.The proportions of hypertension (58.8％ vs.30.6％;x2 =7.228,P=0.007),diabetes (29.4％ vs.6.5％;x2 =9.293,P=0.002),atrial fibrillation (35.3％ vs.3.2％;x2=18.128,P=0.000),and cardiogenic cerebral embolism (35.3％ vs.3.2％ ; P =0.000) were significantly higher than those in the non-HT group,while the proportion of small arterial occlusive stroke was significantly lower than that in the non-HT group (38.2％ vs.62.9％ ;P =0.032).Multivariate logistic regression analysis showed that age (odds ratio [OR] 1.168,95％ confidence interval [CI] 1.059-3.412; P =0.021),infarct volume (OR 3.461,95 ％ CI 1.317-6.270; P =0.044) and atrial fibrillation (OR 1.284,95％ CI 1.117-2.903; P =0.015) were the independent risk factors for HT.In the HT patients,age (69.46 ±7.17 years vs.64.19 ±6.31 years; t =2.248,P =0.032) in the poor outcome group was significantly older than that in the good outcome group.The proportions of hypertension (84.6％ vs.42.9％ ;x2 =781,P =0.016),diabetes (50.0％ vs.14.3％ ;x2 =6.053,P =0.014),cardiogenic cerebral embolism (61.5％ vs.19.0％ ; P =0.025) and hematoma HT (76.9％ vs.19.0％ ;x2 =11.104,P =0.001) were significantly higher than those in the good outcome group.Multivariate logistic regression analysis showed that the diabetes (OR 2.151,95％ CI 1.179-3.218; P =0.023),atrial fibrillation (OR 4.136,95％ CI1.010 to 8.413; P =0.046) and hernatoma HT (OR 2.134,95％ CI 1.219-4.452; P =0.039) were the independent risk factors for the poor outcomes of HT patients at 3 months after symptom onset.Conelusions The incidence of HT in patients with acute ischemic stroke was 35.4％.Age,infarct volume and atrial fibrillation were the independent risk factors for HT,and diabetes,atrial fibrillation and hematoma HT were the independent risk factors for the poor outcomes in HT patients at 3 months after symptom onset.

Microneedle percutaneous immunization is achieved by puncturing the stratum corneum of the skin with microneedles so that the vaccine is efficiently recognized by antigen-presenting cells to induce a specific immune response. Due to the advantages of efficient induction of immune response, low pain and easy storage, transdermal immunization by microneedles has been widely used for immunization of various vaccines in recent years. This review summarizes the materials of microneedles, application for transcutaneous immunization, as well as the challenges that need to be addressed.
Administration, Cutaneous ; Drug Delivery Systems ; Needles ; Vaccination ; Vaccines