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The Annals of Thoracic Surgery, Vol 43, 386-390, Copyright © 1987 by The Society of Thoracic Surgeons

ARTICLES

Cerebral blood flow and autoregulation during hypothermic cardiopulmonary bypass

P Johnsson, K Messeter, E Ryding, L Nordstrom and E Stahl

Mean hemispheric cerebral blood flow (CBF) was studied following intravenous or intraarterial administration of xenon-133, in 10 men admitted for coronary artery bypass grafting. Repeated CBF measurements were performed to evaluate autoregulation before, during, and after cardiopulmonary bypass (CPB). During CPB mean CBF remained unchanged compared with the pre-CPB level, without evidence of cerebral hyperemia or impairment of autoregulation. A marked increase in CBF occurred after CPB and was followed by a time-dependent reduction toward the pre- CPB level. The data support the alpha-stat regulation theory but cannot explain the cerebral vasodilation observed after CPB.


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Copyright © 1987 by The Society of Thoracic Surgeons.