title: Intracranial large artery disease in Alzheimer's disease and vascular dementia among ethnic Asians.
abstract: OBJECTIVE
  An underlying vascular etiology underpins vascular dementia (VaD) and possibly Alzheimer's disease (AD). Intracranial large artery disease (ICLAD) is a common site of disease among ethnic Asians, and carries a poor prognosis. We studied the prevalence of ICLAD among ethnic Asian patients with AD and VaD.
  
  
  METHODS
  We recruited patients with AD and VaD from a retrospective review of consecutive ethnic Asian patients presenting to our dementia clinic. ICLAD was evaluated by visual inspection of brain magnetic resonance angiography by two observers in consensus, and defined as >50% luminal narrowing.
  
  
  RESULTS
  There were 56 patients with probable AD and 47 with probable VaD. ICLAD was prevalent among 53% of VaD patients and 18% of AD patients.
  
  
  CONCLUSIONS
  There is a relatively high burden of ICLAD among AD and VaD patients of Asian ethnicity. We suggest that ethnic Asian dementia patients are a potential group to investigate if ICLAD is associated with clinical symptoms or prognosis and if treatment strategies targeted at ICLAD retard the progression of cognitive impairment.
authors.affiliation: Singapore General Hospital, Outram Road, Singapore. gnrdsd@sgh.com.sg
authors.forename: D A
authors.initials: DA
authors.lastname: De Silva
authors.forename: M
authors.initials: M
authors.lastname: Ancalan
authors.forename: K
authors.initials: K
authors.lastname: Doshi
authors.forename: H-M
authors.initials: HM
authors.lastname: Chang
authors.forename: M-C
authors.initials: MC
authors.lastname: Wong
authors.forename: C
authors.initials: C
authors.lastname: Chen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000150:complications*; D044466:Asian People; D003430:Cross-Sectional Studies; D015140:Dementia, Vascular / Q000150:complications*; D005260:Female; D006801:Humans; D020765:Intracranial Arterial Diseases / Q000150:complications* / Q000453:epidemiology*; D008297:Male; D015995:Prevalence; D012189:Retrospective Studies