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Heterogeneity in mild cognitive impairment: differences in neuropsychological profile and associated white matter

Lisa Delano-Wood1, Mark W Bondi, Joshua Sacco

  • 1Department of Psychiatry, School of Medicine, University of California-San Diego, La Jolla, CA 92161, USA. ldelano@ucsd.edu

Journal of the International Neuropsychological Society : JINS
|November 7, 2009
PubMed

Insights

Distinct subtypes of Mild Cognitive Impairment (MCI) were identified, showing varying white matter lesion (WML) burdens. These findings suggest different underlying pathologies contribute to MCI progression.

Area of Science:

  • Neuroscience
  • Gerontology
  • Radiology

Background:

  • Mild Cognitive Impairment (MCI) is a heterogeneous condition.
  • Understanding MCI subtypes is crucial for targeted interventions.
  • White Matter Lesions (WMLs) are common in aging and may influence cognitive decline.

Purpose of the Study:

  • To delineate distinct neuropsychological profiles within a sample of individuals with MCI.
  • To investigate the contribution of white matter lesion (WML) burden to observed MCI group differences.
  • To explore potential differences in lesion types across identified MCI subgroups.

Main Methods:

  • A clinical sample of 70 older adults diagnosed with MCI was assessed.
  • Cognitive scores were used to identify distinct patient groups.
  • Semi-automated volumetric analysis of T2-weighted FLAIR MRI images quantified WML burden.
  • Cluster and discriminant analyses were employed to derive and differentiate MCI subgroups.

Main Results:

  • Three distinct MCI subgroups were identified: Memory/Language, Executive/Processing Speed, and Pure Memory.
  • A dose-dependent relationship was observed between WML burden and MCI subgroup.
  • The Executive/Processing Speed subgroup exhibited significantly higher WML burden compared to other subgroups.
  • Dissociation in lesion type was noted: Memory/Language subgroup had higher periventricular lesion (PVL) and lower deep white matter lesion (DWML) volumes, while the Executive/Processing Speed subgroup showed the inverse.

Conclusions:

  • Distinct MCI subgroups can be empirically derived and reliably differentiated.
  • Neuropsychological profiles within MCI are associated with varying WML burdens.
  • Findings suggest diverse underlying pathologies contribute to MCI subtypes, aiding in understanding disease mechanisms.

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