title: Factor analysis supports the evidence of existing hyperactive and hypoactive subtypes of delirium.
abstract: OBJECTIVE
  The aim of this study was to examine whether delirium has specific clinical subtypes.
  
  
  METHODS
  One hundred and eighty-three elderly subjects meeting DSM-IIIR criteria for delirium were evaluated using a 19-item symptom check-list assessing different dimensions of delirium symptomatology. Exploratory factor analysis was conducted in order to examine which symptoms clustered.
  
  
  RESULTS
  Factor analysis confirmed the existence of two different clusters of symptoms: first, symptoms of hyperalert/hyperactive features (agitation, hyper-reactivity, aggressiveness, hallucinations, delusions); and second, symptoms of hypoalert/hypoactive features (decreased reactivity, motor and speech retardation, facial inexpressiveness).
  
  
  CONCLUSIONS
  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.
authors.affiliation: Service Universitaire de Psycho Gériatrie, 1011 CHUV Lausanne, Switzerland. vincent.camus@inst.hospvd.ch
authors.forename: V
authors.initials: V
authors.lastname: Camus
authors.forename: B
authors.initials: B
authors.lastname: Burtin
authors.forename: I
authors.initials: I
authors.lastname: Simeone
authors.forename: P
authors.initials: P
authors.lastname: Schwed
authors.forename: R
authors.initials: R
authors.lastname: Gonthier
authors.forename: G
authors.initials: G
authors.lastname: Dubos
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001143:Arousal; D003693:Delirium / Q000145:classification* / Q000175:diagnosis / Q000523:psychology*; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D011569:Psychiatric Status Rating Scales; D011595:Psychomotor Agitation / Q000523:psychology