Evidence that volume of anterior medial temporal lobe is reduced in seniors destined for mild cognitive impairment.
The present study sought to determine if volumes of specific brain structures could discriminate cognitively normal seniors destined to develop mild cognitive impairment (MCI) within a few years from those who will remain normal. Brain scans were collected from seventy-one cognitively normal seniors. Seventeen individuals later developed MCI (the presymptomatic MCI; pMCI group), while fifty-four remained normal. Whole brain volume (WBV) and volumes of the entorhinal cortex (ERC), hippocampus, and three subregions of the hippocampus (head; HH, body; HB and tail; HT) were compared. Results indicated that the pMCI group had smaller volumes than the normal group in the ERC, HH and HB, but not the HT or WBV. When HH/HB volumes and baseline memory test scores were included in a single logistic regression model, classification accuracy was very high (area under the curve=0.93). These results show that smaller normalized volumes of anterior medial temporal lobe structures contribute to the development of MCI, a finding which may have implications for identifying seniors at risk for cognitive decline.
Martin
Sarah B
SB
Department of Anatomy and Neurobiology, Chandler Medical Center, University of Kentucky, Lexington, KY 40536-0298, USA.
Smith
Charles D
CD
Collins
Heather R
HR
Schmitt
Fred A
FA
Gold
Brian T
BT
D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000473:pathology* / Q000523:psychology; D000544:Alzheimer Disease / Q000175:diagnosis / Q000473:pathology / Q000523:psychology; D003072:Cognition Disorders / Q000175:diagnosis / Q000473:pathology* / Q000523:psychology; D015331:Cohort Studies; D018450:Disease Progression; D042241:Early Diagnosis; D018728:Entorhinal Cortex / Q000473:pathology*; D005260:Female; D006624:Hippocampus / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D013702:Temporal Lobe / Q000473:pathology*