International psychogeriatrics
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Delirium frequently accompanies acute illness. With treatment of the illness, some individuals recover from delirium while for others the symptoms persist. It is not understood why some individuals improve but others do not. The purpose of this paper is to review systematically what is known about the factors associated with the persistence of delirium. ⋯ Preliminary findings suggest that some factors may identify those at risk for persistent delirium; however, more research is needed.