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首页> 外文期刊>Journal of Cerebral Blood Flow and Metabolism: Official Journal of the International Society of Cerebral Blood Flow and Metabolism >Early disrupted neurovascular coupling and changed event level hemodynamic response function in type 2 diabetes: an fMRI study
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Early disrupted neurovascular coupling and changed event level hemodynamic response function in type 2 diabetes: an fMRI study

机译:2型糖尿病的早期神经血管偶联破坏和事件水平的血液动力学反应功能改变:fMRI研究

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Type 2 diabetes (T2DM) patients develop vascular complications and have increased risk for neurophysiological impairment. Vascular pathophysiology may alter the blood flow regulation in cerebral microvasculature, affecting neurovascular coupling. Reduced fMRI signal can result from decreased neuronal activation or disrupted neurovascular coupling. The uncertainty about pathophysiological mechanisms (neurodegenerative, vascular, or both) underlying brain function impairments remains. In this cross-sectional study, we investigated if the hemodynamic response function (HRF) in lesion-free brains of patients is altered by measuring BOLD (Blood Oxygenation Level-Dependent) response to visual motion stimuli. We used a standard block design to examine the BOLD response and an event-related deconvolution approach. Importantly, the latter allowed for the first time to directly extract the true shape of HRF without any assumption and probe neurovascular coupling, using performance-matched stimuli. We discovered a change in HRF in early stages of diabetes. T2DM patients show significantly different fMRI response profiles. Our visual paradigm therefore demonstrated impaired neurovascular coupling in intact brain tissue. This implies that functional studies in T2DM require the definition of HRF, only achievable with deconvolution in event-related experiments. Further investigation of the mechanisms underlying impaired neurovascular coupling is needed to understand and potentially prevent the progression of brain function decrements in diabetes.
机译:2型糖尿病(T2DM)患者发展为血管并发症,神经生理损害的风险增加。血管病理生理学可能会改变脑微血管中的血流调节,影响神经血管的耦合。 fMRI信号降低可能是由于神经元激活降低或神经血管耦合破坏所致。关于脑功能受损的病理生理机制(神经退行性,血管性或两者兼有)的不确定性仍然存在。在这项横断面研究中,我们研究了通过测量对视觉运动刺激的BOLD(血液氧合水平依赖性)反应是否改变了患者无病灶脑中的血液动力学反应功能(HRF)。我们使用标准块设计来检查BOLD响应和与事件相关的反卷积方法。重要的是,后者允许首次使用性能匹配的刺激在没有任何假设的情况下直接提取HRF的真实形状,并探测神经血管的耦合。我们发现糖尿病早期的HRF有变化。 T2DM患者显示出明显不同的fMRI反应谱。因此,我们的视觉范例证明了完整的脑组织中神经血管耦合受损。这意味着T2DM中的功能研究需要定义HRF,只有在事件相关实验中通过反卷积才能实现。需要进一步研究神经血管耦合受损的潜在机制,以了解并潜在预防糖尿病患者脑功能下降的进展。

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