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The Journal of Thoracic and Cardiovascular Surgery, Vol 90, 729-735, Copyright © 1985 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Sympathoadrenal function during cardiac operations in infants with the technique of surface cooling, limited cardiopulmonary bypass, and circulatory arrest

RK Firmin, P Bouloux, P Allen, RC Lima and JC Lincoln

The sympathoadrenal response to surface cooling, limited cardiopulmonary bypass, and deep hypothermic circulatory arrest was investigated in 22 infants undergoing correction of congenital heart defects. Surface cooling to 26 degrees C was associated with a significant rise in plasma epinephrine and norepinephrine levels. Both levels fell during the period of core cooling on bypass, presumably because of hemodilution. Following the period of circulatory arrest there was a rise in both catecholamine levels that correlated nonlinearly with the duration of circulatory arrest. The catecholamine levels remained high after rewarming until the chest was closed. The results suggest that this type of surgical procedure produces severe sympathoadrenal stress. The extremely high values found in the postarrest period in some patients, who had had a long period of arrest (greater than 40 minutes), may indicate hypoxic stress. The biological effect of high circulating plasma catecholamines during hypothermia is difficult to assess. The heart rate response to plasma catecholamine levels tended to diminish on cooling in our patients.


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