Coronary artery bypass grafting-associated ischemic stroke. A clinical and neuroradiological study.

Ischemic stroke occurring after coronary artery bypass grafting (CABG) has been attributed to various factors. Little is known about the perioperative course and radiological topography of CABG-associated strokes. In this study the clinical and computed tomography features of 25 patients with ischemic stroke following coronary artery bypass grafting were evaluated. Four patients awakened with focal signs, and 21 developed an ischemic stroke 1 to 22 days after surgery. All 4 patients with early stroke had prolonged episodes of operative hypotension. Three of these patients had multiple subcortical and cortical infarcts. Of the 21 patients with late-onset ischemic stroke, 19 had single-territory infarcts (middle cerebral artery territory, N = 12; posterior cerebral artery territory, N = 4; anterior cerebral artery territory, N = 3). Two patients had multiple territory infarcts in the anterior and posterior circulation. No watershed infarcts were found in any of the 25 patients. New-onset atrial fibrillation and location of ischemic stroke in a single vascular territory were more common in patients who had an ischemic stroke after an asymptomatic interval. Duplex sonographic findings of the carotid arteries and oculoplethysmography (OPG) were available for 13 patients. Only 1 patient had an ipsilateral carotid stenosis. Of 21 patients who underwent postoperative two-dimensional echocardiography (with additional transesophageal echocardiography in 4), 2 had a left ventricular thrombus. These findings support the concept that post-CABG stroke is likely embolic.