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Journal of Sensors
Volume 2015, Article ID 106537, 8 pages
Research Article

An eHealth System for Pressure Ulcer Risk Assessment Based on Accelerometer and Pressure Data

1Safety and Security Department, AIT Austrian Institute of Technology GmbH, Reininghausstr 20, 8020 Graz, Austria
2Hilfswerk Österreich, Apollog 4/5, 1070 Vienna, Austria
3Salzburg Research Forschungsgesellschaft mbH, Jakob-Haringerstraße 5/3, 5020 Salzburg, Austria
4ilogs mobile software GmbH, Krone Platz 1I, 9020 Klagenfurt, Austria

Received 20 October 2014; Revised 7 January 2015; Accepted 21 January 2015

Academic Editor: Josep Samitier

Copyright © 2015 Dieter Hayn et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Pressure ulcers are a common skin disease which is associated with pain, reduced autonomy, social isolation, and reduced quality of life. There are several systems for monitoring of pressure ulcer-related risk factors on the market, but up to now no satisfactory solution is available, especially for people with medium pressure ulcer risk. We present a novel pressure ulcer risk assessment and prevention system, which combines the advantages of accelerometer and pressure sensors for monitoring pressure ulcer risk factors. Sensors are used for detection of repositionings of the person lying on the mattress. Sensor data are sent to a tablet where they are analysed and presented graphically. The system was evaluated in a long-term test at the homes of people of the target group. Results indicate that the system is able to detect movements of persons while lying in bed. Weak correlation in between mobility and Braden pressure ulcer risk was found (correlation factor = 0.31). From our data, long-term trends could be visualized as well as 24 h mobility profiles. Such graphical illustrations might be helpful for caregivers in order to optimize care of people with medium to high pressure ulcer risk.