The present study is a randomized, prospective, single-blinded study. A total of 172 patients presenting for percoutaneous endoscopic gastrostomy (PEG) under sedation will be included according to the statistical sample size calculation. Patients will be randomized to either group 1- standard monitoring (pulseoxymetry and non-invasive blood preassure monitoring) or group 2- standard monitoring and thoracic impedance measurement during Propofol-based sedation for PEG. Episodes of Hypoxia are documented and compared in both groups. Statistical analysis will be done in cooperation with the statistical biomedical institute oft he university hospital in Frankfurt.
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comparison of hypoxia in both arms
Timeframe: Average duration period of PEG-placement: approx. 15 minutes.