Characterization of Signals from Multiscale Edges
IEEE Transactions on Pattern Analysis and Machine Intelligence
Protocols and Architectures for Wireless Sensor Networks
Protocols and Architectures for Wireless Sensor Networks
Continuous Noninvasive Pulse Transit Time Measurement for Psycho-physiological Stress Monitoring
ETELEMED '09 Proceedings of the 2009 International Conference on eHealth, Telemedicine, and Social Medicine
BSN '09 Proceedings of the 2009 Sixth International Workshop on Wearable and Implantable Body Sensor Networks
Inkjet-printed monopole antennas for enhanced-range WBAN and wearable biomonitoring application
Proceedings of the 2nd ACM international workshop on Pervasive Wireless Healthcare
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The pulse transit time (PTT) is a parameter which can be used to characterize the functional state of the cardiovascular system. The PTT, which is closely connected to the blood pressure, can be derived from an electrocardiogram (ECG) and a simultaneously recorded photoplethysmogram (PPG) signal. In contrast to conventional non-invasive blood pressure measurements, the PTT can be calculated quasi continuously, giving instant feedback to condition changes. Many proposed systems use cables to connect ECG and PPG sensors. This is sufficient for stationary applications. This paper presents a system for wireless PTT measurements that permits patient mobility and thus makes new application scenarios possible. The main challenge of wireless time synchronization, necessary for precise PTT results, is solved using the IEEE 802.15.4 beacon enabled mode.