International Journal of Geriatric Psychiatry · 2000 · 57 citations · 13 references
This preliminary study seems to support the evidence of hypoactive and hyperactive subtypes of delirium, even though their aetiology and prognostic values need to be further examined.
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Delirium in Hospitalized Older Persons: Outcomes and Predictors
Peter Pompei, Marquis Foreman, Mark A. Rudberg et al. · Journal of the American Geriatrics Society · 1994 · 446 citations
An Empirical Study of Delirium Subtypes
Benjamin Liptzin, Sue E. Levkoff · The British Journal of Psychiatry · 1992 · 399 citations