title: Syndromes of behavioural and psychological symptoms in mild Alzheimer's disease.
abstract: OBJECTIVE
  Behavioural and psychological symptoms of dementia (BPSD) are common in Alzheimer's disease (AD), and are associated with significant distress for patient and carer. Certain behavioural and psychological symptoms have been associated with each other, leading to the suggestion that differences in symptom patterns among patients with AD may represent different syndromes within AD. The purpose of this study is to see if patients with AD could be meaningfully classified into syndromes, based on the relationships between their BPSD.
  
  
  METHODS
  The sample was recruited through a memory clinic. Two hundred and forty first visit patients with a diagnosis of very mild to mild AD were included. BPSD were assessed using the BEHAVE-AD. Latent class analysis was used to assess for different classes or groups of patients within the sample, based on their behavioural and psychological symptoms.
  
  
  RESULTS
  Three classes were identified; Class 1 with a low prevalence of behavioural and psychological symptoms; Class 2 an anxiety/depressive symptom class and Class 3 an aggressive symptom class.
  
  
  CONCLUSIONS
  The three classes (or groups) of patients obtained by LCA in this sample may be explained by a 'latent', as yet, unidentified factor. Further research is required to determine if these classes are stable over time, and to identify possible latent variables.
authors.affiliation: Mercer's Institute for Research on Ageing, St James's Hospital, Dublin, Ireland. mariapmoran@eircom.net
authors.forename: Maria
authors.initials: M
authors.lastname: Moran
authors.forename: C
authors.initials: C
authors.lastname: Walsh
authors.forename: A
authors.initials: A
authors.lastname: Lynch
authors.forename: R F
authors.initials: RF
authors.lastname: Coen
authors.forename: D
authors.initials: D
authors.lastname: Coakley
authors.forename: B A
authors.initials: BA
authors.lastname: Lawlor
mesh_terms: D000368:Aged; D000374:Aggression; D000544:Alzheimer Disease / Q000145:classification / Q000523:psychology*; D005163:Factor Analysis, Statistical; D005260:Female; D015577:Geriatric Assessment / Q000379:methods; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000209:etiology; D011569:Psychiatric Status Rating Scales; D012920:Social Behavior Disorders / Q000209:etiology*; D013577:Syndrome