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The British Journal of Psychiatry (2007) 190: 135-141. doi: 10.1192/bjp.bp.106.023911
© 2007 The Royal College of Psychiatrists

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Phenomenology of delirium

Assessment of 100 adult cases using standardised measures

DAVID J. MEAGHER, MARIA MORAN, BANGARU RAJU and DYMPNA GIBBONS

Department of Adult Psychiatry, Midwestern Regional Hospital, Limerick

SINEAD DONNELLY

Milford Hospice Palliative Care Centre, Limerick

JEAN SAUNDERS

Statistical Consulting Unit, University of Limerick, Limerick, Ireland

PAULA T. TRZEPACZ

Lilly Research Laboratories, Indianapolis, Indiana, University of Mississippi Medical School, Jackson, Mississippi, Tufts University School of Medicine, Boston, Massachusetts and Indiana University School of Medicine, Indianapolis, Indiana, USA

Correspondence: Dr David Meagher, Department of Adult Psychiatry, Midwestern Regional Hospital, Limerick, Ireland. Email: meaghermob{at}eircom.net

Declaration of interest P.T. is an employee of Eli Lilly. D. M. has an unrestricted educational grant from Astra Zeneca Pharmaceuticals.

Background Delirium phenomenology is understudied.

Aims To investigate the relationship between cognitive and non-cognitive delirium symptoms and test the primacy of inattention in delirium.

Method People with delirium (n=100) were assessed using the Delirium Rating Scale–Revised–98 (DRS–R98) and Cognitive Test for Delirium (CTD).

Results Sleep–wake cycle abnormalities and inattention were most frequent, while disorientation was the least frequent cognitive deficit. Patients with psychosis had either perceptual disturbances or delusions but not both. Neither delusions nor hallucinations were associated with cognitive impairments. Inattention was associated with severity of other cognitive disturbances but not with non-cognitive items. CTD comprehension correlated most closely with non-cognitive features of delirium.

Conclusions Delirium phenomenology is consistent with broad dysfunction of higher cortical centres, characterised in particular by inattention and sleep–wake cycle disturbance. Attention and comprehension together are the cognitive items that best account for the syndrome of delirium. Psychosis in delirium differs from that in functional psychoses.

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Phenomenolgy of Delirium

Sarah M Maddicott, et al.

BJP Online, 7 Sep 2007 [Full text]