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首页> 外文期刊>Annals of Biomedical Engineering: The Journal of the Biomedical Engineering Society >Normal and hydrocephalic brain dynamics: the role of reduced cerebrospinal fluid reabsorption in ventricular enlargement.
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Normal and hydrocephalic brain dynamics: the role of reduced cerebrospinal fluid reabsorption in ventricular enlargement.

机译:正常和脑积水的脑动力学:脑脊液重吸收减少在心室扩大中的作用。

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摘要

CINE phase-contrast MRI (CINE-MRI) was used to measure cerebrospinal fluid (CSF) velocities and flow rates in the brain of six normal subjects and five patients with communicating hydrocephalus. Mathematical brain models were created using the MRI images of normal subjects and hydrocephalic patients. In our model, the effect of pulsatile vascular expansion is responsible for pulsatile CSF flow between the cranial and the spinal subarachnoidal spaces. Simulation results include intracranial pressure gradients, solid stresses and strains, and fluid velocities throughout the cranio-spinal system. Computed velocities agree closely with our in vivo CINE-MRI CSF flow measurements. In addition to normal intracranial dynamics, our model captures the transition to acute communicating hydrocephalus. By increasing the value for reabsorption resistance in the subarachnoid villi, our model predicts that the poroelastic parenchyma matrix will be drained and the ventricles enlarge despite small transmantle pressure gradients during the transitional phase. The poroelastic simulation thus provides a plausible explanation on how reabsorption changes could be responsible for enlargement of the ventricles without large transmantle pressure gradients.
机译:CINE相衬MRI(CINE-MRI)用于测量6名正常受试者和5名交流性脑积水患者的脑脊液(CSF)速度和流速。使用正常受试者和脑积水患者的MRI图像创建脑数学模型。在我们的模型中,脉动性血管扩张的影响是颅和脊柱蛛网膜下腔之间的脉动性CSF流动的原因。模拟结果包括颅内压力梯度,固体应力和应变以及整个颅脊系统的流体速度。计算速度与我们的体内CINE-MRI CSF流量测量结果非常吻合。除了正常的颅内动力学,我们的模型还捕获了向急性沟通性脑积水的过渡。通过增加蛛网膜下腔绒毛的重吸收阻力值,我们的模型预测,尽管在过渡期跨膜压力梯度较小,但多孔弹性薄壁组织将被排出,心室增大。因此,多孔弹性模拟提供了一个合理的解释,说明在没有较大跨穿层压力梯度的情况下,重吸收变化如何导致心室增大。

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