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A total of 1,377 patients with symptomatic obstructive cerebrovascular disease (most commonly, internal carotid artery occlusion) entered a trial in which they were randomized to either medical or surgical (extracranial-intracranial bypass) therapy. All but 8 had hemoglobin estimations performed at entry. The patients were followed for an average of 55.8 months. In the medical group, the 325 patients with high normal hemoglobin concentration (15 g/l or more) suffered no more ischemic strokes than the 382 patients with lower values (less than 15 g/l). Those strokes that did occur were no more severe in the high than the low hemoglobin group. Hemoglobin concentration did not emerge as a prognostic factor in those patients treated surgically (n = 662). This prospective study counters the hypothesis that high normal hemoglobin concentration is associated with poor outcome in patients with symptomatic obstructive disease of the carotid and cerebral arteries.

Hemoglobin concentration and prognosis in symptomatic obstructive cerebrovascular disease.