The purpose of this study is to determine whether Electrical Impedance Tomography can be used as sensitive and specific predictor in the detection of postoperative pulmonary complications (e.g. pneumonia, bronchitis, acute respiratory distress syndrome, pleural effusion, pneumothorax, pulmonary edema, atelectasis, pulmonary embolism, hypoxemia, hypercapnia, spasms and obstructions of the airway) in patients undergoing epigastric surgery.
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Change of regional ventilation partition (ROI analysis in 8 pulmonary ROIs) from preoperative to postoperative state.
Timeframe: 1.) First EIT-measure: Preoperative Day; 2.) Second EIT-measure: Day of Operation (after extubation) or in between Postoperative Day 1-7 (in case of deferred extubation)