Mechanical ventilation is indispensable for most of surgical interventions but can induce lung injury even in pulmonary healthy patients. This can lead to postoperative pulmonary complications. These adverse effects could be prevented by a better monitoring of intraoperative lung function. Electrical impedance tomography is able to visualize aeration within the lung in real time. The planned study investigates the influence of different levels of positive endexspiratory pressure and different tidal volumes on the aeration.
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Change of "dependent silent spaces" (DSS) and "non-dependent silent spaces" (NSS)
Timeframe: measurement of DSS and NSS are carried out prior to induction of anesthesia, 10 minutes after induction, 30 minutes after after installation of capnoperitoneum, 10 minutes after skin closure, 15 minutes after arrival at the PACU