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Current Directions in Biomedical Engineering

Joint Journal of the German Society for Biomedical Engineering in VDE and the Austrian and Swiss Societies for Biomedical Engineering

Editor-in-Chief: Dössel, Olaf

Editorial Board: Augat, Peter / Buzug, Thorsten M. / Haueisen, Jens / Jockenhoevel, Stefan / Knaup-Gregori, Petra / Kraft, Marc / Lenarz, Thomas / Leonhardt, Steffen / Malberg, Hagen / Penzel, Thomas / Plank, Gernot / Radermacher, Klaus M. / Schkommodau, Erik / Stieglitz, Thomas / Urban, Gerald A.

Open Access
Online
ISSN
2364-5504
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In-ear photoplethysmography for central pulse waveform analysis in non-invasive hemodynamic monitoring

Timo Tigges
  • Corresponding author
  • Chair of Electronics and Medical Signal Processing, Technische Universität Berlin, Berlin, Germany
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/ Jonas Rockstroh
  • Chair of Electronics and Medical Signal Processing, Technische Universität Berlin, Berlin, Germany
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/ Alexandru Pielmuş
  • Chair of Electronics and Medical Signal Processing, Technische Universität Berlin, Berlin, Germany
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/ Michael Klum
  • Chair of Electronics and Medical Signal Processing, Technische Universität Berlin, Berlin, Germany
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/ Aarne Feldheiser
  • Department of Anaesthesiology and Intensive Care Medicine, Campus Virchow-Klinikum, Charité - University Medicine Berlin, Germany
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/ Oliver Hunsicker
  • Department of Anaesthesiology and Intensive Care Medicine, Campus Virchow-Klinikum, Charité - University Medicine Berlin, Germany
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/ Reinhold Orglmeister
  • Chair of Electronics and Medical Signal Processing, Technische Universität Berlin, Berlin, Germany
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Published Online: 2017-09-07 | DOI: https://doi.org/10.1515/cdbme-2017-0122

Abstract

In recent years, the analysis of the photoplethys-mographic (PPG) pulse waveforms has attracted much research focus. However, the considered signals are primarily recorded at the fingertips, which suffer from reduced peripheral perfusion in situations like hypovolemia or sepsis, rendering waveform analysis infeasible. The ear canal is not affected by cardiovascular centralization and could thus prove to be an ideal alternate measurement site for pulse waveform analysis. Therefore, we developed a novel system that allows for highly accurate photoplethysmographic measurements in the ear canal. We conducted a measurement study in order to assess the signal-to-noise ratio of our developed system Hereby, we achieved a mean SNR of 40.65 dB. Hence, we could show that our system allows for highly accurate PPG recordings in the ear canal facilitating sophisticated pulse waveform analysis. Furthermore, we demonstrated that the pulse decomposition analysis is also applicable to in-ear PPG recordings.

About the article

Published Online: 2017-09-07


Citation Information: Current Directions in Biomedical Engineering, Volume 3, Issue 2, Pages 587–590, ISSN (Online) 2364-5504, DOI: https://doi.org/10.1515/cdbme-2017-0122.

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©2017 Timo Tigges et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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