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Population studies of sporadic cerebral amyloid angiopathy and dementia: a systematic review Keage HA; Carare RO; Friedland RP; Ince PG; Love S; Nicoll JA; Wharton SB; Weller RO; Brayne CBMC Neurol 2009[Jan]; 9 (�): 3BACKGROUND: Deposition of amyloid-beta (Abeta) in vessel walls of the brain as cerebral amyloid angiopathy (CAA) could be a major factor in the pathogenesis of dementia. Here we investigate the relationship between dementia and the prevalence of CAA in older populations. We searched the literature for prospective population-based epidemiological clinicopathological studies, free of the biases of other sampling techniques, which were used as a comparison. METHODS: To identify population-based studies assessing CAA and dementia, a previous systematic review of population-based clinicopathological studies of ageing and dementia was employed. To identify selected-sample studies, PsychInfo (1806-April Week 3 2008), OVID MEDLINE (1950-April Week 2 2008) and Pubmed (searched 21 April 2008) databases were searched using the term "amyloid angiopathy". These databases were also employed to search for any population-based studies not included in the previous systematic review. Studies were included if they reported the prevalence of CAA relative to a dementia classification (clinical or neuropathological). RESULTS: Four population-based studies were identified. They showed that on average 55-59% of those with dementia displayed CAA (of any severity) compared to 28-38% of the non-demented. 37-43% of the demented displayed severe CAA in contrast to 7-24% of the non-demented. There was no overlap in the range of these averages and they were less variable and lower than those reported in 38 selected sample studies (demented v non-demented: 32-100 v 0-77% regardless of severity; 0-50 v 0-11% for severe only). CONCLUSION: CAA prevalence in populations is consistently higher in the demented as compared to the non-demented. This supports a significant role for CAA in the pathogenesis of dementia.|Aged, 80 and over[MESH]|Aging[MESH]|Apolipoproteins E/genetics[MESH]|Brain/*pathology[MESH]|Cerebral Amyloid Angiopathy/complications/*epidemiology/pathology[MESH]|Dementia/complications/*epidemiology/pathology[MESH]|Female[MESH]|Humans[MESH]|Male[MESH]|Prevalence[MESH]|Risk Factors[MESH] |