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  • Title: Temperature and ventilation after hypothermic cardiopulmonary bypass.
    Author: Sladen RN.
    Journal: Anesth Analg; 1985 Aug; 64(8):816-20. PubMed ID: 4014746.
    Abstract:
    Rewarming in the postoperative period after hypothermic cardiopulmonary bypass is often associated with hemodynamic and ventilatory instability. Temperature changes, PaCO2 values, and delivered mechanical ventilation were observed for the first 12 hr in the intensive care unit in 73 patients who had undergone cardiac surgery with hypothermic cardiopulmonary bypass. Mean rectal temperature increased from 34.7 to 38.3 degrees C over the first 8 hr after admission to the intensive care unit (P less than 0.001). The temperature curve was sigmoid rather than linear, and the most rapid rate of temperature increase occurred 2-4 hr after admission. During rewarming, the most common abnormality of PaCO2 on mechanical ventilation was acute respiratory acidosis (PaCO2 greater than 45 mm Hg, pH less than 7.35), which occurred in 42% of patients. This suggests that ventilatory management in the early postoperative period after hypothermic cardiopulmonary bypass should be carefully adjusted to the increased metabolic rate during rapid rewarming.
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