Neural correlates of visual hallucinations in dementia with Lewy bodies.
Fiche publication
Date publication
janvier 2015
Auteurs
Membres identifiés du Cancéropôle Est :
Pr NAMER Izzie-Jacques, Dr NOBLET Vincent
Tous les auteurs :
Heitz C, Noblet V, Cretin B, Philippi N, Kremer L, Stackfleth M, Hubele F, Armspach JP, Namer I, Blanc F
Lien Pubmed
Résumé
INTRODUCTION: The aim of this study was to investigate the association between visual hallucinations in dementia with Lewy bodies (DLB) and brain perfusion using single-photon emission computed tomography. METHODS: We retrospectively included 66 patients with DLB, 36 of whom were having visual hallucinations (DLB-hallu) and 30 of whom were not (DLB-c). We assessed visual hallucination severity on a 3-point scale of increasing severity: illusions, simple visual hallucinations and complex visual hallucinations. We performed voxel-level comparisons between the two groups and assessed correlations between perfusion and visual hallucinations severity. RESULTS: We found a significant decrease in perfusion in the left anterior cingulate cortex, the left orbitofrontal cortex and the left cuneus in the DLB-hallu group compared with the DLB-c group. We also found a significant correlation between decreased bilateral anterior cingulate cortex, left orbitofrontal cortex, right parahippocampal gyrus, right inferior temporal cortex and left cuneus perfusion with the severity of hallucinations. CONCLUSIONS: Visual hallucinations seem to be associated with the impairment of anterior and posterior regions (secondary visual areas, orbitofrontal cortex and anterior cingulate cortex) involved in a top-down and bottom-up mechanism, respectively. Furthermore, involvement of the bilateral anterior cingulate cortex and right parahippocampal gyrus seems to lead to more complex hallucinations.
Référence
Alzheimers Res Ther. 2015 Feb 17;7(1):6