Ion-molecule reaction mass spectrometry may allow the continuous and noninvasive monitoring of expiratory propofol levels in patients undergoing general anesthesia.

We spend 90% of our time indoors. Buildings became larger and more complex (international airports, subway stations, shopping malls or hospitals for example). Our behaviour has changed. Given the possibilities of ubiquitous technology, we are used to finding out what our position is whenever we want -so far almost exclusively outdoors, however. We have little data on where and how people move indoors. There are various technologies for Indoor Positioning, but none of them dominates the market because of the very different requirements of the large range of applications. With Bluetooth Low Energy (BLE or Bluetooth Smart), a new technology has entered the market, and using it for Indoor Positioning is currently at the forefront of developments. Common positioning methods based on BLE include lateration, angulation, fingerprinting and proximity solutions. Most of them are based on the Received Signal Strength Indicator (RSSI). The RSSI correlates with the distance between transmitter and receiver antenna. However, the link is not as continuous as mathematical models suggest. The RSSI is influenced by many variables, some of which can be controlled and others not. This paper sums up general BLE positioning methods and the challenges they face with RSSI. Keywords:Indoor Positioning, Bluetooth Low Energy, Received Signal Strength Indicator, beacon

We report about an 81-year-old male patient who suffered a medial femoral neck fracture after a fall on the left leg. A total hip arthroplasty was planned based on the appropriate indications. The planning was complicated by the presence of an intramedullary Küntscher femoral nail inserted after a motorcycle incident approximately 60 years ago. After fenestration of the proximal lateral femur, the nail was sawn off and a cemented total hip arthroplasty and plate osteosynthesis were performed.