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Ann Thorac Surg 1986;41:255-259
© 1986 The Society of Thoracic Surgeons

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Articles

The Protective Effect of Profound Hypothermia on the Canine Central Nervous System during One Hour of Circulatory Arrest

From the Department of Surgery, Division of Cardiothoracic Surgery, and the Department of Pathology, State University of New York, Down-state Medical Center, Brooklyn, NY.

Accepted for publication May 3, 1985.

^* Address reprint requests to Dr. Griepp, Annenberg Building 7–54, Mount Sinai Medical Center, 1 Gustave Levy Place, New York, NY 10029.

Circulatory arrest during profound hypothermia is a safe technique of cardiac surgery when used in selected instances. Despite its proven safety, the degree of cerebral protection offered by this technique is still poorly defined. Ten dogs anesthetized with Pentothal (thiopental sodium) were surface cooled to 32°C. They were placed on cardiopulmonary bypass, cooled to 13°C (cerebral temperature), and then underwent one hour of circulatory arrest. At the end of the arrest period, the dogs were rewarmed, resuscitated, and successfully weaned from bypass. A control group of 6 dogs were subjected to the same protocol but without the one-hour period of circulatory arrest. There were no group differences in animal weight, duration of surface cooling, cardiopulmonary bypass, or rewarming, mean flow, or mean arterial pressure. After a 7-day observation period, the dogs were killed with rapid tissue fixation using formalin. No neurological deficits were noted in any of the dogs during the observation period. The fixed brains were examined by a neuropathologist. No gross or microscopic evidence of cerebral hypoxia was seen in any of the animals. We conclude that one hour of circulatory arrest under profoundly hypothermic temperatures produces no detectable neurological changes or histological evidence of cerebral hypoxia.

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