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The Annals of Thoracic Surgery, Vol 54, 609-615, Copyright © 1992 by The Society of Thoracic Surgeons

ARTICLES

Cerebral blood flow and metabolism in hypothermic circulatory arrest

CK Mezrow, AM Sadeghi, A Gandsas, HH Shiang, D Levy, R Green, IR Holzman and RB Griepp
Department of Cardiothoracic Surgery, Mount Siani Medical Center, New York, NY 10029.

Although hypothermic circulatory arrest has been accepted for use in cardiovascular operations, the potential for cerebral injury exists. The mechanism of the cerebral injury remains unclear. To address these questions we studied cerebral blood flow and metabolism. Sixteen puppies were randomly assigned to undergo either 45 or 90 minutes of hypothermic circulatory arrest after perfusion/surface cooling to 13 degrees C. Cerebral blood flow, cerebral oxygen and glucose metabolism, and cerebral vascular resistance measurements were obtained at 37 degrees C, 13 degrees C, 10 minutes after reperfusion, 30 degrees C and 2 and 4 hours after hypothermic circulatory arrest. No neurologic or behavioral changes were observed in any of the long-term survivors (11/16). Metabolic and cerebral blood flow data did not differ between groups. Cerebral blood flow was significantly lower in the late postarrest measurements, whereas oxygen and glucose consumption had returned to baseline values. In the presence of low cerebral blood flow and high cerebral vascular resistance it is notable that control levels of oxygen consumption were attained by abnormally high oxygen extraction. These data strongly suggest a vulnerable interval after hypothermic circulatory arrest in which cerebral metabolism is limited by cerebral blood flow.

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