Relationship between arterial stiffness and cognitive function in outpatients with dementia and mild cognitive impairment compared with community residents without dementia

BACKGROUND It is unclear whether the dementia patients with Alzheimer’s disease(AD) and vascular dementia(VaD) and mixed dementia(MIX, including AD and VaD) would have more developed arterial stiffness as compared with local residents without dementia. The aim of this study was to assess arterial stiffness and cognitive function in different types of dementia patients [AD, VaD, MIX and mild cognitive impairment(MCI)] and community residents without dementia.METHODS This was a single-center, cross-sectional observational study. We studied a cohort of 600 elderly outpatients with a complaint of memory loss, who were divided into four groups(AD, VaD, MIX and MCI). In addition, they were compared with55 age-matched local residents without dementia(Controls). We assessed arterial stiffness by brachial-ankle pulse wave velocity(baPWV) and the global cognitive function by the Mini-Mental State Examination(MMSE).RESULTS The baPWV was higher in AD, VaD and MIX than in MCI and in Controls(P < 0.05). The baPWV was higher in MCI than in Controls(P = 0.021), while MMSE were compatible between them(P = 0.119). The higher baPWV predicted the presence of AD, VaD, MIX and MCI with the odds ratio of 6.46, 8.74, 6.16 and 6.19, respectively. In contrast, there were no difference in baPWV among three different types of dementia(P = 0.191). The linear relationship between baPWV and MMSE was observed in the elderly with MMSE ≥ 23(R = 0.452, P = 0.033), while it was not in dementia patients(MMSE < 23).CONCLUSIONS The findings suggest that MCI and dementia patients have stiffer arteries as compared with age-matched local residents, although global cognitive function may be comparable between MCI and the local residents.