“…A systematic review found that the reported prevalence of delirium in dementia patients varys widely between 22% and 89% (Fick et al 2002) highlighting the difficulty of recognising delirium in dementia patients. Improvements in recognition would be an important development as delirium often has an identifiable and treatable cause (McGohan 2005). Fick et al, (2009) proposed that increasing cognitive reserve through social and physical activity may protect against delirium in AD patients, as individuals without dementia who have low levels of reserve are more likely to develop delirium (Jones et al 2006).…”