title: Arterial spin labeling may contribute to the prediction of cognitive deterioration in healthy elderly individuals.
abstract: OBJECTIVE
  To explore whether arterial spin labeling (ASL) imaging in cognitively intact elderly individuals may be used to predict subsequent early neuropsychological decline.
  
  
  METHODS
  The local ethics committee approved this prospective study, and written informed consent was obtained from all participants. A total of 148 consecutive control subjects were included, 75 of whom had stable cognitive function (sCON) (mean age, 75.9 years ± 3.4 [standard deviation]; 43 female) and 73 of whom had deteriorated cognitive function (dCON) at 18-month clinical follow-up (mean age, 76.8 years ± 4.1; 44 female). An additional 65 patients with mild cognitive impairment (MCI) (mean age, 76.2 years ± 6.1; 25 female) were also included. Two-dimensional pulsed ASL was performed at the baseline visit. Statistical analysis included whole-brain voxelwise analysis of the ASL relative cerebral blood flow (CBF) data, receiver operating characteristic (ROC) curve analysis of the posterior cingulate cortex (PCC), and voxel-based morphometry analysis of gray matter.
  
  
  RESULTS
  The voxelwise comparison of ASL revealed decreased relative CBF in the dCON group compared with that in the sCON group and slightly more pronounced relative CBF in the MCI group compared with that in the sCON group, most notably in the PCC (P < .05 corrected). Comparison of the dCON group with the MCI group revealed no significant differences. ROC analysis of relative CBF in the PCC enabled discrimination of dCON (P < .001; area under the ROC curve, 0.66). There was no confounding focal gray matter atrophy.
  
  
  CONCLUSIONS
  Reduced ASL in the PCC at baseline is associated with the development of subsequent subtle neuropsychological deficits in healthy elderly control subjects. At a group level, ASL patterns in subjects with dCON are similar to those in patients with MCI at baseline, indicating that these subjects may initially maintain their cognitive status via mobilization of their neurocognitive reserve at baseline; however, they are likely to develop subsequent subtle cognitive deficits.
authors.affiliation: From the Department of Mental Health and Psychiatry (A.X., C.R., M.L.M., S.T., E.T., P.G.), Division of Geriatrics, Department of Internal Medicine, Rehabilitation and Geriatrics (F.R.H., D.Z.), and Department of Imaging and Medical Informatics (K.O.L., S.H.), University Hospitals of Geneva and Faculty of Medicine of the University of Geneva, Rue Gabrielle Perret-Gentil 4, 1211 Geneva 14, Switzerland; and Department of Radiology and Nuclear Medicine, Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, the Netherlands (F.B.).
authors.forename: Aikaterini
authors.initials: A
authors.lastname: Xekardaki
authors.forename: Cristelle
authors.initials: C
authors.lastname: Rodriguez
authors.forename: Marie-Louise
authors.initials: ML
authors.lastname: Montandon
authors.forename: Simona
authors.initials: S
authors.lastname: Toma
authors.forename: Eline
authors.initials: E
authors.lastname: Tombeur
authors.forename: François R
authors.initials: FR
authors.lastname: Herrmann
authors.forename: Dina
authors.initials: D
authors.lastname: Zekry
authors.forename: Karl-Olof
authors.initials: KO
authors.lastname: Lovblad
authors.forename: Frederik
authors.initials: F
authors.lastname: Barkhof
authors.forename: Panteleimon
authors.initials: P
authors.lastname: Giannakopoulos
authors.forename: Sven
authors.initials: S
authors.lastname: Haller
mesh_terms: D000368:Aged; D001158:Arteries; D060825:Cognitive Dysfunction / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D059906:Neuroimaging / Q000379:methods*; D011237:Predictive Value of Tests; D011446:Prospective Studies; D013113:Spin Labels
chemical_list: D013113:Spin Labels