Racine AM, et al. - This ongoing prospective, observational cohort study was performed to estimate the clinical outcomes of relative risks (RRs) in older surgical patients with mild cognitive impairment (MCI) alone or with delirium. The authors found an association of MCI with an increased risk of delirium incidence and severity. Patients with delirium and MCI had synergistically elevated risk of developing new difficulties in cognitively demanding tasks.