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Canadian Journal of Anesthesia, Vol 34, 450-454, Copyright © 1987 by Canadian Anesthesiologists' Society

ARTICLES

The effects of cardiopulmonary bypass and profound hypothermic circulatory arrest on anterior fontanel pressure in infants

PJ Stow, FA Burrows, ME McLeod and JG Coles
Department of Anaesthesia, Hospital for Sick Children, Toronto, Ontario.

The Ladd transducer was used to measure anterior fontanel pressure in 23 infants undergoing cardiopulmonary bypass and profound hypothermic circulatory arrest for surgical correction of congenital heart disease. Mean (+/- SD) minimum oesophageal and rectal temperatures of 11.3 +/- 1.5 degrees C and 18.1 +/- 2.2 degrees C respectively were achieved with a mean duration of arrest of 53.4 +/- 13.9 minutes. During reperfusion cardiopulmonary bypass after circulatory arrest, mean anterior fontanel pressure (18.3 +/- 6.4 mmHg) increased above baseline pre-bypass values (10.6 +/- 2.9 mmHg) (p less than 0.005). Mean arterial blood pressure decreased significantly from pre-bypass values (57.0 +/- 11.8 mmHg) during both cooling (38.8 +/- 8.4 mmHg) and rewarming cardiopulmonary bypass (45.8 +/- 8.9 mmHg) (p less than 0.005). These changes were associated with a significant decrease in cerebral perfusion pressure during cooling (27.3 +/- 11.0 mmHg) and rewarming cardiopulmonary bypass (27.5 +/- 10.6 mmHg), compared with baseline pre-bypass values (46.5 +/- 12.3 mmHg) (p less than 0.005). The data demonstrate significant but transient decreases in cerebral perfusion pressure during cooling and rewarming bypass.


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Copyright © 1987 by the Canadian Anesthesiologists' Society.