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An Ear-Worn Vital Signs Monitor

Author(s)
He, David Da; Winokur, Eric S.; Sodini, Charles G.
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Abstract
This paper presents a wearable vital signs monitor at the ear. The monitor measures the electrocardiogram (ECG), ballistocardiogram (BCG), and photoplethysmogram (PPG) to obtain pre-ejection period (PEP), stroke volume (SV), cardiac output (CO), and pulse transit time (PTT). The ear is demonstrated as a natural anchoring point for the integrated sensing of physiological signals. All three signals measured can be used to obtain heart rate (HR). Combining the ECG and BCG allows for the estimation of the PEP, while combining the BCG and PPG allows for the measurement of PTT. Additionally, the J-wave amplitude of the BCG is correlated with the SV and, when combined with HR, yields CO. Results from a clinical human study on 13 subjects demonstrate this proof-of-concept device.
Date issued
2015-10
URI
http://hdl.handle.net/1721.1/102274
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Journal
IEEE Transactions on Biomedical Engineering
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
He, David Da, Eric S. Winokur, and Charles G. Sodini. “An Ear-Worn Vital Signs Monitor.” IEEE Trans. Biomed. Eng. 62, no. 11 (November 2015): 2547–2552.
Version: Author's final manuscript
ISSN
0018-9294
1558-2531

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