Wearable Body Sensor Network for Continuous Context-Related Pulse Arrival Time Monitoring

J. Muehlsteff, J. Espina, M.A.A. Alonso, X. Aubert, and T. Falck (Germany)

Keywords

Wearable monitoring, body sensor networks, Pulse Arrival Time, ECG, contextrelated measurements, and cuffless blood pressure.

Abstract

We present a wearable IEEE 802.15.4-based wireless Body Sensor Network (BSN) suitable for unobtrusive continuous monitoring of Pulse Arrival Time (PAT) in personal healthcare applications. The PAT is measured with a single lead electrocardiogram (ECG) patch on the chest and a photoplethysmogram (PPG) sensor at the ear or finger. Additionally context information is inferred via the detection of a subject’s motion and posture with a 3-D acceleration sensor. Since PAT measurements require the synchronization of the wireless sensors’ clocks, the robust Flooding Time Synchronization Protocol (FTSP) was implemented. The acquired data are stored, processed in real-time, as well as visualized on a Personal Digital Assistant. We analyze the performance and opportunities of the system for long-term data acquisition and especially emphasize the importance of context information and strategies for motion artifact suppression towards the realization of wearable cuff-less blood pressure measurements.

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