The impact of silent vascular brain burden in cognitive impairment in Parkinson's disease

R. González-Redondo, J. Toledo, P. Clavero, I. Lamet, D. García-García, R. García-Eulate, P. Martínez-Lage, M. C. Rodríguez-Oroz

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Background and purpose: White matter hyperintensities (WMHs) detected by magnetic resonance imaging (MRI) of the brain are associated with dementia and cognitive impairment in the general population and in Alzheimer's disease. Their effect in cognitive decline and dementia associated with Parkinson's disease (PD) is still unclear. Methods: We studied the relationship between WMHs and cognitive state in 111 patients with PD classified as cognitively normal (n=39), with a mild cognitive impairment (MCI) (n=46) or dementia (n=26), in a cross-sectional and follow-up study. Cognitive state was evaluated with a comprehensive neuropsychological battery, and WMHs were identified in FLAIR and T2-weighted MRI. The burden of WMHs was rated using the Scheltens scale. Results: No differences in WMHs were found between the three groups in the cross-sectional study. A negative correlation was observed between semantic fluency and the subscore for WMHs in the frontal lobe. Of the 36 non-demented patients re-evaluated after a mean follow-up of 30months, three patients converted into MCI and 5 into dementia. Progression of periventricular WMHs was associated with an increased conversion to dementia. A marginal association between the increase in total WMHs burden and worsening in the Mini Mental State Examination was encountered. Conclusions: White matter hyperintensities do not influence the cognitive status of patients with PD. Frontal WMHs have a negative impact on semantic fluency. Brain vascular burden may have an effect on cognitive impairment in patients with PD as WMHs increase overtime might increase the risk of conversion to dementia. This finding needs further confirmation in larger prospective studies.

Original languageEnglish (US)
Pages (from-to)1100-1107
Number of pages8
JournalEuropean Journal of Neurology
Issue number8
StatePublished - Aug 2012


  • Dementia
  • Mild cognitive impairment
  • Parkinson's disease
  • Silent vascular lesions
  • White matter hyperintensities

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology


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