EMC11 Abstracts
Where do we stand on remote physiological monitoring (LTMS) . Dr Olivier Chételat; Dr Jens Krauss Olivier Chételat got his PhD from the Swiss Federal Institute of Technology in Lausanne. He joined CSEM in 2001 where he has been involved in the management of several projects, in particular ESA projects related to vital parameter monitoring such as LTMS (long-term medical survey system). Since 2009, he is head of the Control & Sensing section. Jens Krauss graduated from the Swiss Federal Institute of Technology in Zurich. He joined CSEM in 1996 and he is heading today the Systems Division, with a total of 70 scientists and engineers active in the strategic R&D activities in Scientific Instrumentation and Medical Device Technology. Mr Krauss is holder of several patents within the control and biomedical engineering domain and is Vice-President of the Swiss Society of Biomedical Engineering (www.ssbe.ch). Manned missions in space require specific life support. One of them is the monitoring of human vital signs in order to automatically assess and manage physical and mental health and wellness. Long-term monitoring can help to diagnose hidden chronic disorders at an early stage. Testing a long-term monitoring system on subjects living in a remote and isolated site on Earth with extreme conditions, such as the Concordia station in Antarctica (www.concordiabase.eu) shall provide the European Space Agency (ESA, www.esa.int) with valuable information and experience on the preparation of future manned missions in space. Under contract by ESA, the Swiss Centre for Electronics and Microtechnology (CSEM – www.csem.ch) designed and developed with its project partners AdNovum Informatik AG (www.adnovum.ch), Smartex SpA (www.smartex.it) and the University Hospital in Lausanne (www.chuv.ch) the second generation of the Long Term Monitoring Survey system (LTMS). The heart of the system – an intelligent and wearable life vest – enables the monitoring of the user’s medical condition. Two LTMS systems are now in Concordia (Antarctica) for scientific investigations for monitoring the physiological adaptation of manned crews in remote, isolated, and extreme environments. One LTMS system was used to monitor the subjects wearing the space suit simulator of ÖWF (Austrian Space Forum – www.oewf.org) during the Rio Tinto analogue experiment. The wearable life vest is capable of recording continuously and in a non-invasive manner a range of physiological parameters, including electrocardiography (ECG, 2 leads), physical activity, respiration rate, pulse oximetry (SpO2), core body temperature (BCT) and non-invasive blood pressure (NIBP). While it is common to monitor these medical parameters at rest, getting reliable measurements in mobile and extreme conditions is much more difficult due to the sensitivity to artefacts such as motion, ambient light, temperature and body contact. CSEM’s multi-parameter sensor technology with three integrated ‘electrodes’ provides an innovative approach to assess 24hours on 24hours the user’s health status. The LTMS system is composed of a wearable sensing unit and a portable data recorder, as well as a software on a remote station. The sensing unit simultaneously monitors in an unobtrusive, non-invasive, and modular way by integrating and synchronizing proprietary and commercial sensors. The data recorder controls the sensors, synchronizes the signals, and stores up to 24 hour data. The data records are sent wireless to a remote PC, running the medical processing and diagnostic tools. The software acquires, visualizes, archives and processes the recorded physiological data. Processing includes: estimation of ECG parameters such as QRS complex, ST interval, QT segment, Heart Rate (HR), HR variability (HRV); Estimation of respiration rate; Classification of physical activity.The patient monitoring system was designed, built and tested according to the European directives #93/42/ECC and 2007/47/EC and follows the relevant medical standards. Although not CE certified, because intended to be used within the Concordia Station, the system was clinically validated at the Department of Internal Medicine of the University Hospital in Lausanne, Switzerland. It was tested at the Jungfraujoch research station (3454m) in a controlled environment and the recorded signals were compared to medical reference measurements. We describe the long-term monitoring system, its validation framework and an analysis of its performances on the basis of the data recorded during the clinical validation and the Rio-Tinto experiment. The LTMS system concept opens a wide range of commercial applications in health care and we also present a commercial sports application of the highly integrated LTMS sensing technology to monitor human high performance monitoring, enabling the assessment not only of training, but also of recovery of professional athletes. Related references : [1] Chételat O, J Oster, O Grossenbacher, A Hutter, J Krauss, A Giannakis (2011) AHighly integrated wearable multi-parameter monitoring system for athletes. 15th Nordic-Baltic Conference on Biomedical Engineering and Medical Physics: NBC 2011, June, Aalborg (Denmark). [2] Ridolfi A, R Vetter, J Solà, C Sartori (2010) Physiological monitoring system for high altitude sports. 8th Conference of the International Sports Engineering Association (ISEA), June, Vienna. [3] Ridolfi A, O Chételat, J Krauss, J Solà, O Grossenbacher, S Jakob (2009) A clinically validated patient monitoring system. 4th European Conference of the International Federation for Medical and Biological Engineering, IFMBE Proceedings, 2009, Volume 22, Part 11, 1722-1725. [4] O Chételat, R Gentsch, J Krauss, J Luprano (2008) Getting rid of the wires and connectors in physiological monitoring. Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE, Vancouver [5] O Chételat, J Solà, J Krauss, S Dasen, S Droz, R Gentsch, JM Koller, J Luprano, A O’Hare, P Pilloud, P Theurillat (2006) Continuous multi-parameter health monitoring system. WC2006, Seoul
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