feasibility data will be collected with thorax impedance measurements via body bioimpedance sensor in Ohm before and after pleura drainage, via impedance cardiography stroke volume and cardiac output will be calculated and also respiratory parameters determined via capnograph as carbon dioxide (CO2) in %/ml exhaled volume before and after pleura drainage. Additionally heart sound analysis via electronic stethoscope will be compared to standard methods.

the same measurements as in arm 1: feasibility data will be collected with thorax impedance measurements via body bioimpedance sensor before and after pleura drainage in Ohm, via impedance cardiography stroke volume and cardiac output will be calculated and also respiratory parameters determined via capnograph as carbon dioxide (CO2) in %/ml exhaled volume once in 25 healthy controls.

Additionally heart sound analysis via electronic stethoscope will be compared to standard methods.

non invasive bioimpedance measurements to determine feasibility of body fluid loss before and after pleura drainage in 25 patients > 18 years old; also 25 healthy controls are measured to receive standard values

non invasive bioimpedance measurements to determine feasibility of impedance cardiography before and after pleura drainage; also 25 healthy controls are measured to receive standard values

respiratory parameters as CO2 in %/ml exhaled volume will be determined via capnograph