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Magnetohydrodynamic Voltage Recorder for Comparing Peripheral Blood Flow

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Abstract

Blood flow is a clinical metric for monitoring of cardiovascular diseases but current measurements methods are costly or uncomfortable for patients. It was shown that the interaction of the magnetic field (B 0) during MRI and blood flow in the body, through the magnetohydrodynamic (MHD) effect, produce voltages (V MHD) observable through intra-MRI electrocardiography (ECG), which are correlated with regional blood flow. This study shows the reproducibility of V MHD outside the MRI and its application in a portable flow monitoring device. To recreate this interaction outside the MRI, a static neodymium magnet (0.4T) was placed in between two electrodes to induce the V MHD in a single lead ECG measurement. V MHD was extracted, and integrated over to obtain a stroke volume metric. A smartphone-enabled device utilizing this interaction was developed in order to create a more accessible method of obtaining blood flow measurements. The portable device displayed a <6% error compared to a commercial recorder, and was able to successfully record V MHD using the 0.4T magnet. Exercise stress testing showed a V MHD increase of 23% in healthy subjects, with an 81% increase in the athlete. The study demonstrates a new device utilizing MHD interactions with body circulation to obtain blood flow metrics.

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Acknowledgments

The initial design for the proposed system was developed by senior design team members Kevin Wu, Sheila Donovan, Augustus Huffines, Bobby Leitmann, Luke Mosteller, and Charles Reeder. This research was supported by a NSF I-Corps Grant (#1617340) and a UGA Clinical and Translational Research Unit Grant.

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Authors and Affiliations

  1. College of Engineering, The University of Georgia, 597 D.W. Brooks Drive, Athens, GA, USA

    Kevin J. Wu, T. Stan Gregory, Michael C. Lastinger & Zion Tsz Ho Tse

  2. Department of Cardiology, AU-UGA Medical Partnership, Athens, GA, USA

    Jonathan R. Murrow

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  1. Kevin J. Wu
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Correspondence to Zion Tsz Ho Tse.

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Associate Editor Agata A. Exner oversaw the review of this article.

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Wu, K.J., Gregory, T.S., Lastinger, M.C. et al. Magnetohydrodynamic Voltage Recorder for Comparing Peripheral Blood Flow. Ann Biomed Eng 45, 2298–2308 (2017). https://doi.org/10.1007/s10439-017-1878-5

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  • DOI: https://doi.org/10.1007/s10439-017-1878-5

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