Vascular dementia is the second most common cause of dementia accounting for 10 to 50 per cent of cases, depending on the geographic location, patient population, and clinical methods used. (1,2) The prevalence of vascular dementia is from 1.2 to 4.2 per cent of persons aged 65 years and older, and the incidence is 6 to 12 cases per 1000 persons aged over 70 years per year.(2) The prevalence and the incidence of vascular dementia disease increases with increasing age, and men seem to have a higher prevalence of vascular dementia than women. Epidemiology of vascular dementia has been affected by variations in the definition of the disorder, the clinical criteria used, and the clinical methods applied. (1. 7 75)

The frequency of vascular dementia disease has been higher than previously reported in recent series comprising older subjects. (1.9 Stroke and cerebrovascular disorders relate also to a high risk of cognitive impairment and dementia.(2,76) Finally, vascular factors such as stroke and white-matter lesions have a clinical effect on Alzheimer's disease/26 Thus, vascular factors may even be the leading cause of cognitive impairment worldwide. (77>

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