Persistent Postoperative Hypothermia Postoperative hypothermia is the failure to return to or maintain normothermia (>36°C) 2 to 5 hours after an intensive care unit (ICU) admission associated with Cardiac Surgery (CS). Hypothermia is associated with increased bleeding , infection, a prolonged hospital stay, and death . Large registry observational studies suggest if hypothermia is of short duration, outcomes can be improved. Based on this evidence, we recommend prevention of hypothermia by using forced-air warming blankets, raising the ambient room temperature, and warming irrigation and intravenous fluids to avoid hypothermia in the early postoperative period (class 1, level B-NR). Read Also: Perioperative bleeding. General coagulation management.