Diffusional kurtosis imaging evaluation on the protective effect of limb remote ischemic preconditioning against stroke
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摘要: 目的 探讨经肢体远端缺血预处理(limb remote ischemic preconditioning,LRP)后脑缺血模型大鼠在扩散峰度成像(diffusion kurtosis imaging,DKI)上各指标的改变。 方法 26只成年雄性SD大鼠随机分为LRP组和脑缺血模型对照组(IC组),分别经LRP预处理或阴性预处理后经历1 h的大脑中动脉栓塞建立脑缺血模型。在恢复再灌注后48 h行MRI扫描采集T2FLAIR及DKI数据。 结果 T2FLAIR图像显示LRP组的异常信号范围较IC组明显缩小[(29.80±11.09)vs.(59.35±13.23),P<0.05]。DKI结果显示IC组患侧与健侧各指标[平均峰度(MK)、峰度各向异性(K‖)、径向峰度(K⊥)]之间差异较大,而LRP组患侧各指标则更接近健侧。在LRP组和IC组之间,差异有统计学意义的DKI指标为灰质区MK[(-3.52±22.57)vs.(59.73±11.63),P<0.05]、白质区MK[(3.99±5.32)vs.(42.57±1.94),P<0.01]以及白质区K⊥⊥[(-16.45±4.43)vs.(19.73±5.86),P<0.01]的百分比变化。2组白质区K‖的差值百分比差异无统计学意义[(47.40±29.20)vs.(71.49±15.58),P>0.05]。 结论 LRP能够显著改善脑缺血大鼠模型在DKI上相关度量指标,为探索LRP的神经保护作用的分子机制提供启迪。Abstract: Objective To explore the changes in diffusional kurtosis imaging (DKI) parameters after limb remote ischemic preconditioning (LRP) in experimental stroke. Methods Total 26 adult SD male rats were subjected to LRP group and sham surgery (IC group) and then subsequently underwent 1 h right middle cerebral artery occlusion (MCAo).MRI examination was executed at 48 h after reperfusion to collect data of T2 FLAIR and DKI. Results T2 FLAIR result showed that the lesion in LRP group was much smaller than that in IC group (29.80±11.09 vs.59.35±13.23,P<0.05).There were much differences in DKI parameters[mean kurtosis (MK),K⊥,K‖]between affected side and healthy side in IC group,whereas in LRP group,the DKI parameters showed in affected side were much closer to contralateral side.The percent changes of metrical parameters with statistical differences between LRP and IC group include MK in gray matter (GM,-3.52±22.57 vs.59.73±11.63,P<0.05).MK in white matter (WM,3.99±5.32 vs.42.57±1.94,P<0.01) and K⊥in WM as well (-16.45±4.43 vs.19.73±5.86,P<0.01).The percent in change of K‖revealed no difference between LRP and IC group (47.40±29.20 vs.71.49±15.58,P>0.05). Conclusion LRP could improve the abnormalities in DKI metrics against ischemia,which also offer us clue for explore the neuroprotective mechanism of LRP against stroke.
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