Separating the patient from hypothermic cardiopulmonary bypass(CPB) before achieving adequate rewarming often results in afterdrop, which can predispose to electrolyte disturbances, arrhythmia, hemodynamic alterations, and shivering-induced
increase of
oxygen consumption. In an attempt to find an adequate end point temperature of rewarming after hypothermic CPB, 50 pediatric cardiac surgical patients were randomly assigned for end point temperature of rewarming of 35.5℃(Group 1) or 37℃ (Group
2),
rectal temperature, Thereafter the rectal temperature was measured half, one, four, eight, and 16 hour after arrival to the intensive care unit(ICU), with heart rate and blood pressure. Additionally the rectal temperature was compared with
esophageal
temperature during CPB, and axillary temperature during stay in the ICU. Nonpulsatile perfusion with a rolier pump was used in all patients and a membrane or bubble oxygenator was used for oxygenation. Both groups were comparable with respect to
age,
sex, body surface area, total bypass time, and rewarming time. There was no afterdrop in both groups, and there were no statistical differences in the rectal temperatures between two groups. There also no statistical differences with respect to
the
heart rate and blood pressure between two groups. At the end of rewarming the esophageal temperature was higher than the rectal temperature. The axillary temperature measured in ICU was always lower than the rectal temperature. No shivering was
noted in
all patients. In conclusion, with restoration of rectal temperature above 35.5℃at the end of CPB in pediatric patients, we did not observe an afterdrop.
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