The investigators want to evaluate the effect of prewarming on the rate of postoperative hypothermia and shivering and to compare sublingual versus tympanic temperature assessment during the perioperative period in patients. Patients will be randomly assigned to 4 groups with different duration of prewarming. Body temperature will be recorded regularly by sublingual and tympanic (by thermocouple) measurement. Incidence of hypothermia (temp. \< 36°C) and shivering will be assessed postoperatively.
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Incidence of hypothermic (body temperature < 36°C) patients at postoperative arrival at postoperative care unit (PACU)
Timeframe: postoperative arrival at PACU (once)