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Cardiovascular Response to Mental Stress in Mild Cognitive Impairment and its Association with Cerebral Perfusion

心脏病学 医学 内科学 脑灌注压 心输出量 冲程容积 灌注 血流动力学 血压 心率 睡眠剥夺对认知功能的影响 灌注扫描 认知 冲程(发动机) 心理学 精神科 工程类 机械工程
作者
Brandon Henley,Mahsa Shokouhi,Anushree Y Mahajan,Omer T. Inan,Ihab Hajjar
出处
期刊:Journal of Alzheimer's Disease [IOS Press]
被引量:7
标识
DOI:10.3233/jad-180036
摘要

Mental stress has been linked to various chronic diseases including Alzheimer's disease, but the mechanisms underlying cognitive decline with mental stress are unknown. Reduced cardiovascular response to stress is associated with cardiovascular disease, and the latter is associated with cognitive impairment. We measured electrodermal activity, blood pressure, and cardiac hemodynamics in cognitively normal and mild cognitive impairment (MCI) adults (n = 76, mean age = 58 years, 46% MCI) during rest, a math test, and face-name recall tasks to derive the following cardiovascular indicators: mean arterial pressure, heart rate, stroke volume and cardiac output. These indicators were compared between the two groups. Cerebral blood perfusion via arterial spin-labeling MRI was measured in a subgroup who underwent an MRI scan (n = 30). Following exposure to mental stress, a decrease in stroke volume (p = 0.024) and cardiac output (p = 0.005) was found in the MCI group, but an increase in both parameters in the cognitively normal group. This difference was largest during face-name recall (standardized difference in stroke volume = -0.50, p = 0.029, and in cardiac output = -0.52, p = 0.023). Cardiac output during mental stress, but not at rest, decreased with cerebral perfusion (normal: p = 0.078, β= 1.97, R2 = 0.090; MCI: p = 0.007, β= 2.02, R2 = 0.008). No significant difference was found between the two groups at rest. This preliminary study suggests that individuals with MCI have an insufficient cardiac output, and in turn lower cerebral perfusion in response to mental stress.
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