The role of external carotid revascularization in the treatment of ocular ischemia.

During the past 13 years, 16 patients with visual disturbances, ipsilateral internal carotid artery (ICA) occlusion, and external carotid artery (ECA) stenosis have had ECA reconstruction. Indications for operation included amaurosis fugax (AF) in five patients, AF and transient ischemic attacks in four patients, ischemic optic neuropathy in two patients, retinal artery occlusion in one patient, and blurry vision and scotomata in four patients. In 12 cases (75%), there were hemodynamically significant contralateral ICA lesions, including four contralateral ICA occlusions. EC endarterectomies were performed in 15 patients, whereas one patient was treated with a bypass graft. One transient neurologic event occurred in the perioperative period (6%). There were no deaths nor permanent neurologic deficits. Patients were followed up for periods of 1 to 60 months (mean 18.4 months). Two patients had AF postoperatively; in one instance, AF was associated with ECA thrombosis 53 months after operation. One patient had a transient ischemic attack when the ECA thrombosed 24 months after operation. This study demonstrates that visual symptoms can occur despite ipsilateral ICA occlusion. ECA revascularization is effective and can be performed with acceptable morbidity and mortality.