title: Mild Cognitive Disorders are Associated with Different Patterns of Brain asymmetry than Normal Aging: The PATH through Life Study.
abstract: OBJECTIVE
  Defining how brain structures differ in pre-clinical dementia is important to better understand the pathological processes involved and to inform clinical practice. The aim of this study was to identify significant brain correlates (volume and asymmetry in volume) of mild cognitive disorders when compared to normal controls in a large community-based sample of young-old individuals who were assessed for cognitive impairment.
  
  
  METHODS
  Cortical and sub-cortical volumes were measured using a semi-automated method in 398 participants aged 64-70 years who were selected from a larger randomly sampled cohort and who agreed to undergo an MRI scan. Diagnoses were reached based on established protocols for MCI and a more inclusive category of any Mild Cognitive Disorder (any-MCD: which includes AAMI, AACD, OCD, MNC, CDR, MCI). Logistic regression analyses were used to assess the relationship between volume and asymmetry of theoretically relevant cerebral structures (predictors) and MCI or any-MCD while controlling for age, sex, and intra-cranial volume.
  
  
  RESULTS
  The main correlates of cognitive impairment assessed in multivariate analyses were hippocampal asymmetry (more to left, MCI: OR 0.83, 95%CI 0.71-0.96, p = 0.013; MCD: OR 0.86, 95%CI 0.77-0.97, p = 0.011), lateral ventricle asymmetry (more to left, MCI: OR 0.95, 95%CI 0.91-0.99, p = 0.009; MCD: OR 0.95, 95%CI 0.92-0.98, p = 0.004), and cerebellar cortex asymmetry (more to right, MCI: OR 1.51, 95%CI 1.13-2.01, p = 0.005).
  
  
  CONCLUSIONS
  In this population-based cohort stronger associations were found between asymmetry measures, rather than raw volumes in cerebral structures, and mild cognitive disorders.
authors.affiliation: Centre for Mental Health Research, Australian National University Canberra, ACT, Australia.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Cherbuin
authors.forename: Chantal
authors.initials: C
authors.lastname: Réglade-Meslin
authors.forename: Rajeev
authors.initials: R
authors.lastname: Kumar
authors.forename: Perminder
authors.initials: P
authors.lastname: Sachdev
authors.forename: Kaarin J
authors.initials: KJ
authors.lastname: Anstey