title: [Neuropsychological study of dementia severity in Alzheimer's disease].
abstract: OBJECTIVE
  To investigate the neuropsychological pattern of different dementia severity in Alzheimer Disease (AD).
  
  
  METHODS
  Probable AD patients who were examined with NINCDS-ADRDA criteria for clinical diagnosis of AD were further examined with several neuropsychological tests and the dementia severity was determined with clinical dementia rating (CDR).
  
  
  RESULTS
  There was impairement of visuospatial function in mild AD (CDR = 1). Evident decline was found in moderately severe AD (CDR = 2) and severe AD (CDR = 3). There was impairment of cognition function in mild AD and the decline continued in moderately severe and severe AD. Memory function declined apparently in the early stage of AD, but the decline was not apparent in moderately severe AD. However, the decline became very quick and memory function was completely lost in severe AD. The trend of decline of daily living activity and ability was the same as memory. Alteration in personality appeared in the mild AD and became most evident in severe AD.
  
  
  CONCLUSIONS
  Neuropsychological test is useful in diagnosis of AD in the early stage, and neuropsychological pattern in each stage is useful in differential diagnosis.
authors.affiliation: Beijing Huilongguan Hospital, Beijing 100096.
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000175:diagnosis* / Q000523:psychology; D003072:Cognition Disorders / Q000175:diagnosis; D005260:Female; D006801:Humans; D008297:Male; D008569:Memory Disorders / Q000175:diagnosis; D008875:Middle Aged; D009483:Neuropsychological Tests; D010468:Perceptual Disorders / Q000175:diagnosis; D012720:Severity of Illness Index