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首页> 外文期刊>European journal of neurology: the official journal of the European Federation of Neurological Societies >Effects of physiological aging and cerebrovascular risk factors on the hemodynamic response to brain activation: a functional transcranial Doppler study.
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Effects of physiological aging and cerebrovascular risk factors on the hemodynamic response to brain activation: a functional transcranial Doppler study.

机译:生理性衰老和脑血管危险因素对脑部激活的血液动力学反应的影响:一项功能性经颅多普勒研究。

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摘要

The influence of the vascular system on the coupling of cerebral blood flow (CBF) to focal brain activation during aging is incompletely understood. Using functional transcranial Doppler sonography and a hypercapnic challenge as a marker of intact cerebral vasoreactivity, we determined CBF velocity (CBFV) changes in response to a language and arithmetic task in a group of 43 healthy young subjects (mean age 32 +/- 8.6 years), 18 healthy old subjects (mean age 64 +/- 9.8 years) and 29 old subjects with risk factors for an atherosclerosis (mean age 69 +/- 8.4 years). Despite a similar performance during the cognitive tasks the CBFV changes were significantly lower in the group of old subjects with vascular risk factors compared with the healthy young and old subjects. Similarly, the CBFV changes during hypercapnia were significantly lower in the group of old subjects with vascular risk factors compared with the healthy young and old subjects. In contrast, both cognitive tasks and hypercapnia produced comparable CBFV changes in the group of healthy young and old subjects. These results suggest that the hemodynamic response to neuronal activation is unaffected by aging alone, whereas the presence of cardiovascular risk factors significantly diminishes the capability of cerebral vessels to react to vasodilating stimuli.
机译:血管系统对衰老过程中脑血流(CBF)与局灶性大脑激活的耦合的影响尚不完全清楚。使用功能性经颅多普勒超声检查和高碳酸血症挑战作为完整的脑血管反应性的标志物,我们确定了43位健康的年轻受试者(平均年龄32 +/- 8.6岁)对语言和算术任务的响应而得出的CBF速度(CBFV)变化),18位健康的老年受试者(平均年龄64 +/- 9.8岁)和29位具有动脉粥样硬化危险因素的老年受试者(平均年龄69 +/- 8.4岁)。尽管在认知任务期间表现相似,但与健康的年轻和老年受试者相比,具有血管危险因素的老年受试者组的CBFV变化明显较低。同样,与健康的年轻人和老年人相比,患有血管危险因素的老年患者在高碳酸血症期间的CBFV变化明显更低。相反,在健康的年轻和老年受试者组中,认知任务和高碳酸血症均产生了相当的CBFV变化。这些结果表明,对神经元激活的血流动力学响应不受衰老的影响,而心血管危险因素的存在则大大降低了脑血管对血管舒张刺激作出反应的能力。

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