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Understanding the pathology of vascular cognitive impairment

Kurt A Jellinger1

  • 1Institute of Clinical Neurobiology, Kenyongasse 18, A-1070 Vienna, Austria. kurt.jellinger@univie.ac.at

Journal of the Neurological Sciences
|March 12, 2005
PubMed

Insights

Vascular dementia (VaD), now vascular cognitive impairment (VCI), and mixed dementia lack clear diagnostic criteria. Research suggests differing lesion patterns and pathogenesis for pure VCI versus mixed dementia.

Area of Science:

  • Neurology
  • Pathology
  • Geriatrics

Background:

  • Vascular dementia (VaD), now termed vascular cognitive impairment (VCI), and mixed dementia lack validated neuropathologic criteria.
  • VCI is suggested in 8-10% of cognitively impaired elderly in memory clinics, with autopsy prevalence varying widely (0.03%-58%).
  • Cerebrovascular lesions (CVL) are associated with cognitive impairment, but their specific role and interaction with Alzheimer's disease pathology require further study.

Purpose of the Study:

  • To discuss the prevalence, morphology, and pathogenesis of vascular dementia (VaD)/vascular cognitive impairment (VCI) and mixed dementia.
  • To differentiate the neuropathologic features of pure VCI from mixed dementia.
  • To explore the impact of cerebrovascular lesions on cognitive decline, particularly in relation to Alzheimer's disease.

Main Methods:

  • Review of memory clinic and autopsy series data on VaD/VCI prevalence.
  • Analysis of lesion patterns (microinfarcts, lacunes, large infarcts) in different dementia types.
  • Comparison of neuropathologic findings in pure VCI versus mixed dementia (Alzheimer's disease + vascular encephalopathy).

Main Results:

  • VaD/VCI prevalence varies significantly between clinical and autopsy studies.
  • Pure VCI is often associated with small, subcortical lesions from microangiopathies, differing from mixed dementia's frequent large infarcts.
  • Minor CVL may not be essential for Alzheimer's disease cognitive decline, but mild AD pathology and small vessel disease can interact synergistically.

Conclusions:

  • Validated diagnostic criteria for VCI are needed.
  • The pathogenesis of pure VCI appears distinct from mixed dementia.
  • Further research is required to clarify the impact of vascular lesions on cognitive impairment and their interaction with Alzheimer's disease pathology.

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