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Related Experiment Videos

Delirium: phenomenologic and etiologic subtypes.

C A Ross1, C E Peyser, I Shapiro

  • 1Department of Psychiatry, Johns Hopkins University School of Medicine, Baltimore, Maryland.

International Psychogeriatrics
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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Delirium patients can be classified into "activated" or "somnolent" subtypes based on alertness levels. These subtypes exhibit distinct symptoms and potential underlying causes, suggesting tailored treatment approaches for delirium.

Area of Science:

  • Neurology
  • Psychiatry
  • Geriatrics

Background:

  • Delirium is characterized by clouding of consciousness and cognitive dysfunction.
  • Patient alertness in delirium varies significantly, ranging from stuporous to hyperalert states.
  • Existing scales do not adequately capture the spectrum of alertness in delirious patients.

Purpose of the Study:

  • To develop and validate scales for rating alertness and consciousness clouding in delirium.
  • To categorize delirious patients into phenomenologic subtypes based on alertness.
  • To investigate the clinical correlates and potential pathophysiological differences between these subtypes.

Main Methods:

  • Development of analog scales for delirium patient alertness and consciousness clouding.

Related Experiment Videos

  • Categorization of patients into "activated" (alert) and "somnolent" (stuporous) subtypes.
  • Assessment of cognitive function using the Mini-Mental Status Exam (MMSE) and specific symptom ratings (hallucinations, delusions, illusions, agitation).

    • Main Results:

    • Activated and somnolent patients showed similar MMSE scores and overall delirium severity.
    • Activated patients were more prone to hallucinations, delusions, illusions, and agitation.
    • Hepatic encephalopathy was associated with somnolent delirium, while alcohol withdrawal correlated with activated delirium.

    Conclusions:

    • Alertness level is a valid basis for defining phenomenologic subtypes of delirium.
    • These subtypes are associated with distinct clinical features and potentially different underlying mechanisms.
    • The identified subtypes may inform differential diagnosis and guide targeted therapeutic strategies for delirium.