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Blood Pressure Models for Wearable Sensors
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  • Ana Carolina Gonçalves Seabra ,
  • Alexandre Ferreira da Silva ,
  • Thomas Stieglitz ,
  • Ana Belen Amado Rey
Ana Carolina Gonçalves Seabra
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Alexandre Ferreira da Silva
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Thomas Stieglitz
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Ana Belen Amado Rey
Albert-Ludwigs-University Freiburg, Albert-Ludwigs-University Freiburg

Corresponding Author:[email protected]

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Abstract

As cardiovascular diseases are one of the most prominent illnesses, a continuous, non-invasive, and comfortable monitoring of blood pressure (BP) is indispensable. This paper investigates the best method for obtaining highly accurate BP values in non-invasive measurements when using an ultrasound (US) sensor projected for a wrist-worn device. State-of-the-art BP models were analyzed and qualitatively compared. Relevant arterial parameters such as luminal area, flow velocity and pulse wave velocity, of 729 subjects were extracted from a computer simulated database and served as input parameters for the wearable US. A linear in-silico model calibrated to each arterial-site revealed to be most accurate model. The linear model was used for the extraction of BP by using the US sensor and validated with a commercial pressure sensor in an ex-vivo experimental setup. The results showed an in-silico pulse pressure correlation of 0.978 and mean difference of (-2.134±2.477) mmHg at the radial artery and ex-vivo pressure correlation of 0.994 and mean difference of (0.554 ± 2.315) mmHg. Thus, with the linear model, the US measurement complies with the Association for the Advancement of Medical Instrumentation standard with deviations lower than 5 mmHg.