Neurological complications of coronary revascularization.

In a series of 3,206 consecutive coronary artery bypass procedures performed between 1976 and 1981, 89 patients died (2.8% mortality) and 32 patients (1%) suffered major neurological syndromes. Among the latter patients, four distinct groups were identified. Group 1 consisted of 10 patients who remained unresponsive after operation. In Group 2 were 10 patients who awakened after operation but had clinical evidence of focal cerebral infarction. Group 3 included 6 patients who were initially intact neurologically but in whom neurological deficits later developed. In Group 4 were 6 patients who had severe mental aberration but no focal neurological deficits. The incidence of coma or focal deficit occurring without a lucid interval (Groups 1 and 2) was 0.62%, and these patients had a 30% mortality. Causative factors were suspected in 70% of the patients in Groups 1 and 2, and included atheromatous embolism, perioperative hypotension, carotid artery occlusive disease and air embolism. The outcome was poor for unresponsive patients, with 70% dying or remaining comatose, but nearly all of the patients with focal deficits or severe mental aberration demonstrated notable improvement.