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Artery Research

Volume 25, Issue Supplement 1, December 2019, Pages S7 - S7

2.1 Derivation of Central Aortic Pressure Using the Radial Pulse Waveform Acquired by Millimetre-Wave Radar

Authors
Ahmad Qasem1, 2, *, Oliver Shay3, Catherine Liao3, Mark Butlin1, Alberto Avolio1
1Macquarie University, Sydney, Australia
2AtCor/Cardiex Ltd, Sydney Australia
3Blumio Inc, San Francisco, CA, USA
*Corresponding author. Email: a.qasem@atcormedical.com
Corresponding Author
Ahmad Qasem
Available Online 15 February 2020.
DOI
https://doi.org/10.2991/artres.k.191224.006How to use a DOI?
Abstract

A new wearable sensor using millimetre-wave radar and electromagnetic technology provides 64 signals reflected from one radar sinusoidal signal beamed around the radial artery. It is non-invasive, can be non-contact, and is potentially simpler in acquiring the radial pulse then tonometry. This study assesses whether selection of a signal from the radar sensor and processing that signal using the generalized transfer function employed in the Cardiex SphygmoCor device (conventionally used with tonometry) provides a derived central aortic blood pressure equivalent to that using applanation tonometry. 17 subjects (13 male, age 45 + 10/29–68 years, systolic/diastolic pressure 121 + 19/76 + 13 mmHg) had simultaneous 2 minutes recordings of the radar and tonometer sensor during rest and two manoeuvres (hand-grip challenge and mental stress-test) that changed blood pressure, heart rate and pulse morphology. Of the resulting 51 radar signal recordings, 40 provided analysable data based on the SphygmoCor signal quality index. At least one signal (max 18 signals) was/were selected for each recording. Central systolic pressure (Δ = −0.6 + 1.1 mmHg, r = 0.94, p = 0.0015), augmentation pressure (Δ = −0.2 + 0.9 mmHg, r = 0.92, p = 0.09) and augmentation index (Δ = 0.9 + 2.8 %, r = 0.92, p = 0.05) were similar when derived from radial radar or tonometry signal. Results strongly indicate that the wearable millimetre wave radar device can produce a radial signal that is valid for derivation of central aortic blood pressure.

Copyright
© 2019 Association for Research into Arterial Structure and Physiology. Publishing services by Atlantis Press International B.V.
Open Access
This is an open access article distributed under the CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/).

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Journal
Artery Research
Volume-Issue
25 - Supplement 1
Pages
S7 - S7
Publication Date
2020/02
ISSN (Online)
1876-4401
ISSN (Print)
1872-9312
DOI
https://doi.org/10.2991/artres.k.191224.006How to use a DOI?
Copyright
© 2019 Association for Research into Arterial Structure and Physiology. Publishing services by Atlantis Press International B.V.
Open Access
This is an open access article distributed under the CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

TY  - JOUR
AU  - Ahmad Qasem
AU  - Oliver Shay
AU  - Catherine Liao
AU  - Mark Butlin
AU  - Alberto Avolio
PY  - 2020
DA  - 2020/02
TI  - 2.1 Derivation of Central Aortic Pressure Using the Radial Pulse Waveform Acquired by Millimetre-Wave Radar
JO  - Artery Research
SP  - S7
EP  - S7
VL  - 25
IS  - Supplement 1
SN  - 1876-4401
UR  - https://doi.org/10.2991/artres.k.191224.006
DO  - https://doi.org/10.2991/artres.k.191224.006
ID  - Qasem2020
ER  -