Strain Plethysmography at the Radial Artery: A Promising Technique for Cuffless Blood Pressure Estimation

Arash Shokouhmand, Xinyu Jiang, Farrokh Ayazi, Negar Ebadi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This study introduces a novel framework based on radial strain plethysmography (SPG) for cuffless estimation of blood pressure (BP). For this purpose, a sensitive, custom-built micro-electromechanical systems (MEMS) strain sensor is used to capture pulse information at the radial artery. A comprehensive feature set consisting of the timing intervals between the fiducial points of the SPG segments, their derivatives, and integrals was extracted and concatenated with the demographic information of the subjects. An XGBoost regressor is then trained on the extracted features to estimate the systolic and diastolic blood pressures, SBP and DBP, respectively. The model is evaluated on 15 subjects using a 5-cross-validation (5-CV) approach. Mean error (ME), mean absolute error (MAE), and root mean square error (RMSE) of -0.22, 3.59, and 5.12 mmHg, respectively, are reported for the estimated DBP values, and ME, MAE, and RMSE of -1.00, 6.23, and 8.96 mmHg, respectively, are achieved for SBP estimation. It is also indicated that significant features for BP estimation encompass both demographic information and timing intervals, highlighting their combined importance. The results demonstrate that radial SPG is a reliable alternative to optical-based technologies for accurate BP estimation.

Original languageEnglish
Title of host publicationBioCAS 2023 - 2023 IEEE Biomedical Circuits and Systems Conference, Conference Proceedings
ISBN (Electronic)9798350300260
DOIs
StatePublished - 2023
Event2023 IEEE Biomedical Circuits and Systems Conference, BioCAS 2023 - Toronto, Canada
Duration: 19 Oct 202321 Oct 2023

Publication series

NameBioCAS 2023 - 2023 IEEE Biomedical Circuits and Systems Conference, Conference Proceedings

Conference

Conference2023 IEEE Biomedical Circuits and Systems Conference, BioCAS 2023
Country/TerritoryCanada
CityToronto
Period19/10/2321/10/23

Keywords

  • MEMS
  • Strain plethysmography (SPG)
  • blood pressure (BP)
  • demographic information
  • radial artery
  • timing intervals

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