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Abstract Background Covid-19 control policies have entailed lockdowns and confinement. Although these isolation measures are thought to be particularly hard and possibly harmful to people with dementia, their specific impact during the pandemic has not yet been synthesised. We aimed to examine and summarise the global research evidence describing the effect of Covid-19 isolation measures on the health of people living with dementia. Method We searched Pubmed, PsycINFO and CINAHL up to February 2021 for peer-reviewed quantitative studies of the effects of isolation measures during Covid-19 on cognitive, psychological and functional symptoms of people with any kind of dementia or mild cognitive impairment. We summarised the findings of included papers following current guidelines for rapid reviews. Results We identified 15 eligible papers, examining a total of 6,442 people with dementia. 13/15 were conducted in people living in the community and 2 in care homes. 60% (9/15) studies reported changes in cognition with 77% (7/9) of them describing declined cognition by >50% of respondents. 93% (14/15) of studies reported worsening or new onset of behavioural and psychological symptoms. 46% (7/15) studies reported changes in daily function, 6 of them reporting a functional decline in a variable proportion of the population studied. Conclusion Lockdowns and confinement measures brought about by the pandemic have damaged the cognitive and psychological health and functional abilities of people with dementia across the world. It is urgent that infection control measures applied to people with dementia are balanced against the principles of non-maleficence. This systematic review makes 4 specific calls for action. Key Points Neuropsychiatric symptoms of people with dementia (e.g., anxiety, depressive symptoms, apathy, agitation) were found to worsen during lockdown in the majority of studies. Cognitive decline affecting memory, orientation concentration and communication was observed by caregivers within few weeks after lockdown. The deterioration reported occurred in a short window of time (between 1 and 4 months) and it is unlikely to be attributable to the natural variation of the course of dementia. There is little research conducted in care home residents with dementia (only 2 papers found). Increase consumption of antipsychotics and benzodiazepines has occurred in people with dementia during lockdown. Evidence indicates that isolation measures quickly damaged people’s with dementia cognitive and mental health and probably accelerated overall decline.
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