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Objective To investigate the effects of octanol,a gap junction blocker,on the levels of pro-inflammatory cytokines after cerebral ischemia-reperfusion in rats.Methods Seventy-two male SD rats were randomly divided into sham operation group,saline control group,vehicle group,and octanol intervention group (n =18 in each group).The model of transient middle cerebral artery occlusion was induced by the modified suture method.The octanol intervention group was intraperitoneally injected with octanol solution at 5 mmol/kg body weight 30 min before ischemia.The saline control group and the vehicle group were intraperitoneally injected with the same amount of physiological saline and 5％ dimethyl sulfoxide solution 30 min before procedure.The neurological deficit score,brain water content,and cerebral infarction volume in each group were detected after ischemia for 2 h and reperfusion for 24 h.Enzyme-linked immunosorbent assay was used to detect the serum interleukin (IL)-1β,IL-6,and tumor necrosis factor-α (TNF-α) levels.Results Compared with the saline control group and the vehicle group,the neurological deficit score of the octanol intervention group was significantly lower (all P ＜0.05),the brain tissue water content was significantly decreased (P ＜ 0.05),the cerebral infarction volume was significantly reduced (P ＜0.05),and the expression levels of IL-1β,IL-6,and TNF-α were significantly decreased (all P ＜0.05).There were no significant differences in neurological deficit score,brain water content,cerebral infarction volume and serum IL-1 [β,IL-6 and TNF-α levels between the saline control group and the vehicle group.Conclusion Gap junction blocker octanol can reduce cerebral ischemic-reperfusion injury.Its mechanism may be related to the alleviation of inflammatory response.
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Objective To investigate the relationship between the numbers of deep medullary veins (DMV) beside the ipsilateral lateral ventricle and the stenotic degree of large artery of ipsilateral internal carotid artery (ICA) system and cerebrovascular reactivity (CVR) in patients with acute cerebral infarction showed on susceptibility-weighted imaging (SWI) in middle cerebral artery (MCA) territory.Methods The patients with acute cerebral infarction in MCA territory who underwent SWI,cerebral angiography and the transcranlal Doppler carbon dioxide challenge test during the hospital stay were enrolled retrospectively.According to the numbers of DMV beside the lateral ventricle on SWI,they were classified into 3 grades:Grade 1:DMV ＜5; Grade 2:DMV 5-10; Grade 3:DMV ＞ 10.The correlations of the DMV grades and the degree of ipsilateral ICA/MCA and CVR were analyzed.Results A total of 44 patients with acute cerebral infarction in MCA territory were enrolled.Twenty-four patients were DMV 1,15 were DMV2,and 5 were DMV 3.The mean stenosis degree of the main arteries of the ipsilateral ICA system was 40.52％ ±30.62％.The mean CVR of MCA was 0.41 ± 0.16.The stenosis degrees in the DMA grade 1,2,and 3groups were 31.31％ ± 26.02％,44.93％ ± 31.03％,and 71.76％ ± 26.68％,respectively.There were significant differences among the 3 groups (F=4.589,P =0.018),and the stenosis degree in the DMV grade 3 group was significantly higher than that in the DMV grade 1 group (P=0.014).The CVRs in the grade 1,2,and 3 groups were 0.45 ± 0.12,0.41 ± 0.18,and 0.22 ± 0.12,respectively.There were significant differences among the 3 groups (F=6.179,P=0.005),and the CVR in the DMV grade 3 group was significantly lower than that in the DMV grade 1 group (P =0.006) and in the DMV grade 2 group (P =0.038).Spearman correlation analysis showed that DMV grade was significantly positively correlated with the stenosis degree (rs =0.381,P =0.013),and was significantly negatively correlated with CVR (rs =-0.375,P=0.012).Conclusions The DMV grade in patients with cerebral infarction was positively correlated with the stenosis degree of responsible large artery and was negatively correlated with the MCA CVR in the responsible side.
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Objective To study the clinical applied value of computed tomography perfusion imaging(CTPI) in early stage of ischemic stroke.Methods Routine CT scan and CTPI were performed in 45 patients with early stage of ischemic stroke(onset within 24 hours).CTPI yields a set of perfusion related parameters of relatine cerebral blood flow(rCBF), cerebral blood volume(rCBV),mean transmit time(rMTT),time to peak(rTTP) and positive enhancement integral (rPE).Results In all 45 patients,21 cases showed concerning lesions in the 29 cases with cerebral ischemia results of routine CT scan.16 cases presented normal results. 24 cases were not showed concerning lesions.The sensitivity of diagnose for early stage of ischemic stroke by CT was 46.67% (21/45).The specificity was 72.41% (21/29).44 cases of CTPI with abnormal perfusion changes were all showed concerning lesions. Only one case of CTPI presented negative result,which was acute brainstem infarction confirmed by follow-up magnetic resonance imaging (MRI).The sensitivity of diagnose for early stage of ischemic stroke by CTPI was 97.78% (44/45).The specificity was 100% (44/44).There was significant difference between CTPI and routine CT scan(P