Dynamic cerebral autoregulation (dCA) is a key mechanism that regulates cerebral blood flow (CBF) in response to transient changes in blood pressure (BP). Impairment of dCA could increase vulnerability to hypertensive vascular damage, but also to BP lowering effects of antihypertensive treatment. The literature remains conflicted on whether dCA is altered in Alzheimer’s disease (AD) and mild cognitive impairment (MCI). We summarized available data on dCA in AD and MCI, by searching PubMed, Embase, PsycINFO and Web of Science databases (inception-January 2022). Eight studies (total n = 443) were included in the qualitative synthesis of which seven were eligible for meta-analysis. All studies used Transcranial Doppler (TCD) ultrasonography and transfer function analysis or the autoregulatory index to assess dCA during spontaneous or induced BP fluctuations. Meta-analysis indicated no significant difference between AD, MCI and healthy controls in dCA parameters for spontaneous fluctuations. For induced fluctuations, the available data were limited, but indicative of at least preserved and possibly better autoregulatory functioning in AD and MCI compared to controls. In summary, current evidence does not suggest poorer dCA efficiency in AD or MCI. Further work is needed to investigate dCA in dementia with induced fluctuations controlling for changes in end-tidal carbon dioxide.

The purpose of this paper is to identify to what extent the development of Alzheimer's disease can be delayed or prevented through the use of mindfulness-based interventions. Alzheimer's disease (AD) is a progressive neurodegenerative disease in which accumulation of amyloid plaques and neurofibrillary tangles (NFTs) play an important role. This leads to neuronal cell death and synaptic degeneration, especially in the default-mode network (DMN). No current effective treatment is available. Mindfulness has been related to an increase in volume and connectivity of the exact brain areas affected in AD. Therefore, mindfulness-based interventions (MBIs) such as mindfulness-based stress reduction (MBSR), meditation and yoga have been tested in people with mild cognitive impairment (MCI). MCI is seen as a transitional state between healthy age-related cognitive decline and AD pathology, hence an open window for early intervention. In this paper it is found that mindfulness has great potential to prevent AD-related pathology of the DMN, hence decreasing cognitive decline in people with MCI.