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Although intracranial atherosclerotic disease (ICAD) is a known risk factor for cerebrovascular ischemic events, its potential role in dementia risk remains unclear. The Atherosclerosis Risk in Communities (ARIC) study was a prospective cohort study that recruited participants from four U.S. communities. From 2011 to 2013, a subset comprising 1590 participants (mean age, 77; 40% men; 28% Black) underwent ICAD evaluation and neurocognitive testing to ascertain the prospective association of ICAD with dementia risk, independent of other known cardiovascular risk factors. ICAD was diagnosed based on focal-wall thickness on brain MRI, with or without luminal stenosis on magnetic resonance angiography (MRA).
During a median follow-up of 5.6 years…