Abstract
Introduction. Clinically evident stroke occurs in 2% to 5% of patients after cardiac surgery, but more subtle cerebral ischemia may be missed by computed tomography (CT) or standard magnetic resonance imaging (MRI). Diffusion-weighted MRI (DWI) is more sensitive and specific for acute stroke, and perfusion-weighted MRI (PWI) can demonstrate cerebral perfusion abnormalities in the absence of infarction.
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