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Reader response: Carotid plaques and detection of atrial fibrillation in embolic stroke of undetermined source

We read with much interest the multicenter observational experience of Ntaios et al.1 regarding the incidence of atrial fibrillation among patients with embolic stroke of undetermined source (ESUS). The article added considerably to the increasing evidence regarding the heterogeneity of ESUS and the clinical relevance of nonstenotic carotid artery plaque.2,3 It may also assist in decision making regarding outpatient cardiac event monitoring.