Abstract TP432: Predictors for Dementia Conversion in Cerebral Amyloid Angiopathy From a Stroke Unit

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Objective: Cerebral amyloid angiopathy (CAA) is increasing recognized as a cause of cognitive impairment and dementia in older individuals. This study aimed to investigate predictors of dementia, including imaging markers, in CAA patients from a stroke unit.Methods: A total of 71 non-demented patients from a stroke unit were included according to modified Boston Criteria for probable CAA with available cognitive follow up. These CAA patients included both patients with and patients without previous intracerebral hemorrhage (ICH). At baseline, neuroimaging markers, including lobar microbleeds (CMBs), white matter hyperintensities (WMH), cortical superficial siderosis (cSS) and MRI-visible centrum semiovale perivascular spaces (CSO-PVS) were assessed. The small vessel disease (SVD) score for CAA was calculated by the scores of CMBs, WMH, cSS and CSO-PVS. The association between these neuroimaging markers and dementia conversion was analyzed.Results: The median follow up time is 1.91 years (quartiles 1.14-4.23 years). Fourteen (19.72%) CAA patients developed dementia during follow up period. Thirty-seven CAA patients (52.11%) had previous symptomatic ICH. Age, lobar CMBs≥20 and SVD score were selected from the univariate Cox-regression analysis with p value less than 0.1 (Table1). In a backward stepwise multivariabte analysis including age, previous ICH history and either SVD score or number of CMBs, age and SVD score independently predicted dementia conversion (Table 1). The individual neuroimaging markers for SVD related brain damage (CSO-PVS, cSS, lobar MBs and WMH) did not predict dementia conversion for probable CAA patients.Conclusion: Our results demonstrate that cognitive deterioration of CAA patients appears attributed to cumulative CAA related vasculopathic changes.

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