Definition
Evidence for occlusion or severe stenosis (more than 90%) of the unilateral or bilateral carotid artery as detected by contrast-enhanced CT and carotid duplex scan was defined as cerebral malperfusion. [6] Clinical deficits were associated with preoperative symptomatic motor or sensory deficits, including transient neurological deficit, syncope, stroke, coma, altered consciousness, and hemiplegia.