title: Longitudinal Memory Profiles in Behavioral-Variant Frontotemporal Dementia and Alzheimer's Disease.
abstract: BACKGROUND
  Alzheimer's disease (AD) and behavioral-variant of frontotemporal dementia (bvFTD) can present with an overlapping neuropsychological profile, which often hinders their clinical differentiation.
  
  
  OBJECTIVE
  To compare changes over time in memory, general cognition tasks, and functional scales between bvFTD and AD.
  
  
  METHODS
  Consecutive cases diagnosed with probable bvFTD (n = 22) and typical AD (n = 31) with at least two clinical visits were selected. Of these, 13 (9 AD, 4 bvFTD) underwent Pittsburgh compound B PET scan, which supported the clinical diagnosis in all cases. Mixed-model regressions were used to estimate the differential rate of decline on selected tasks between cohorts.
  
  
  RESULTS
  Analyses demonstrated that, despite equivalent baseline performance, bvFTD patients experienced a more rapid functional deterioration and a steeper decline in global cognition than AD patients. At baseline, both groups were impaired on executive function and memory tasks compared to controls, but these deficits were more marked in the bvFTD group. In addition, performance on these domains continued to decline more rapidly in this group.
  
  
  CONCLUSIONS
  Neither the initial neuropsychological assessment nor projected performances can reliably distinguish the totality of bvFTD and AD individuals. Nevertheless, annual rates of progression on cognitive tasks provide valuable information and will potentially help establish the impact of future therapeutic treatments in these dementia syndromes.
authors.affiliation: Neuroscience Research Australia, NSW, Australia.
authors.forename: Samantha
authors.initials: S
authors.lastname: Schubert
authors.affiliation: Neuroscience Research Australia, NSW, Australia.|The Faculty of Health Sciences, The University of Sydney, NSW, Australia.|ARC Centre of Excellence in Cognition and its Disorders, Sydney, NSW, Australia.
authors.forename: Cristian E
authors.initials: CE
authors.lastname: Leyton
authors.affiliation: Neuroscience Research Australia, NSW, Australia.|ARC Centre of Excellence in Cognition and its Disorders, Sydney, NSW, Australia.|School of Medical Sciences, The University of New South Wales, Sydney, NSW, Australia.
authors.forename: John R
authors.initials: JR
authors.lastname: Hodges
authors.affiliation: Neuroscience Research Australia, NSW, Australia.|ARC Centre of Excellence in Cognition and its Disorders, Sydney, NSW, Australia.|School of Medical Sciences, The University of New South Wales, Sydney, NSW, Australia.
authors.forename: Olivier
authors.initials: O
authors.lastname: Piguet
mesh_terms: D000544:Alzheimer Disease / Q000175:diagnosis* / Q000523:psychology*; D000814:Aniline Compounds; D001921:Brain / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D018450:Disease Progression; D056344:Executive Function; D005260:Female; D005500:Follow-Up Studies; D057180:Frontotemporal Dementia / Q000175:diagnosis* / Q000523:psychology*; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008568:Memory; D008875:Middle Aged; D009483:Neuropsychological Tests; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D013844:Thiazoles
chemical_list: C475519:2-(4'-(methylamino)phenyl)-6-hydroxybenzothiazole; D000814:Aniline Compounds; D019275:Radiopharmaceuticals; D013844:Thiazoles
keywords: Alzheimer’s disease; assessment of cognitive disorders/dementia; cohort study; executive function; frontotemporal dementia; memory