Abstract:
BACKGROUND:Vascular mild cognitive impairment (VMCI) is a potentially transitional state between normal aging and vascular dementia. The presence of macroscopic white matter lesions (WML) of moderate or severe extension on brain MRI is the hallmark of the VMCI. OBJECTIVE:To assess the clinical relevance of the frequency of WML in patients with VMCI independently of total lesion volume (LV). METHODS:In this multicenter study, we included 110 patients with VMCI (age: 74.3 ± 6.6 years; sex: 60 women). Cognitive assessment was performed with the VMCI-Tuscany Neuropsychological Battery, which allowed to identify four VMCI groups: amnestic single (n = 9) and multi-domain (n = 76), non-amnestic single- (n = 10) and multi-domain (n = 15). Distribution and frequency of WML on MRI FLAIR images were evaluated with lesion probability map (LPM). Voxelwise statistics was performed with nonparametric permutation tests, controlling for age, sex, slice thickness, center, magnetic field strength, total LV and head size (p < .01, family-wise error-corrected for multiple comparisons across space). RESULTS:LPM of the WML had a fairly symmetric and widespread distribution across brain. A higher frequency of WML along association tracts of the WM such as inferior longitudinal fascicle, inferior fronto-occipital fascicle and superior longitudinal fascicle, was correlated with worst cognitive scores at the Trail Making Test Part A and Copy of the Rey-Osterrieth Complex Figure. The non-amnestic groups showed a higher frequency of WML in the anterior cingulum and superior longitudinal fascicle close to the frontal gyrus. CONCLUSIONS:Our study showed that in patients with VMCI, independently of total LV, the higher frequency of lesions along association tracts of the WM, which mediate intrahemispheric long-range connectivity, is related with psychomotor speed and constructional praxis. Moreover, a prevalence of lesions in the frontal WM seems to characterize VMCI patients with involvement of non-amnestic domains.
journal_name
Neuroimage Clinjournal_title
NeuroImage. Clinicalauthors
Giorgio A,Di Donato I,De Leucio A,Zhang J,Salvadori E,Poggesi A,Diciotti S,Cosottini M,Ciulli S,Inzitari D,Pantoni L,Mascalchi M,Federico A,Dotti MT,De Stefano N,VMCI-Tuscany Study Group.doi
10.1016/j.nicl.2019.101789subject
Has Abstractpub_date
2019-01-01 00:00:00pages
101789issn
2213-1582pii
S2213-1582(19)30139-1journal_volume
22pub_type
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