Impact of Prewarming on Perioperative Body Core Temperature and the Outcomes of Cytoreductive- and Major Open Abdominal Surgery: A Randomised Trial

Inclusion Criteria: * age \> 18 * elective cytoreductive or major abdominal surgery caused by ovarian cancer, primarily or secondary Exclusion Criteria: * age \< 18 * refusal participate in study * pregnant or breast-feeding women * cardiac ejection fraction \< 30% * terminal renal insufficiency requiring dialysis * severe pulmonary disease (Gina-Classification\< 3) * neurological and/or psychiatric disease * patient is placed in an institution due to court order * lack of language skills/understanding * employee of Charité Berlin * alcohol addiction * refusal of epidural anesthesia or failure to insert epidural catheter * participation in other perioperative, invasive studies which prohibit further study inclusion