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Blood pressure altering method affects correlation with pulse arrival time

Abstract

Objective: Pulse arrival time (PAT) is a potential main feature in cuff-less blood pressure (BP) monitoring. However, the precise relationship between BP parameters and PAT under varying conditions lacks a complete understanding. We hypothesize that simple test protocols fail to demonstrate the complex relationship between PAT and both SBP and DBP. Therefore, this study aimed to investigate the correlation between PAT and BP during two exercise modalities with differing BP responses using an unobtrusive wearable device. Methods: Seventy-five subjects, of which 43.7% had a prior diagnosis of hypertension, participated in an isometric and dynamic exercise test also including seated periods of rest prior to, in between and after. PAT was measured using a prototype wearable chest belt with a one-channel electrocardiogram and a photo-plethysmography sensor. Reference BP was measured auscultatory. Results: Mean individual correlation between PAT and SBP was −0.82 ± 0.14 in the full protocol, −0.79 ± 0.27 during isometric exercise and −0.77 ± 0.19 during dynamic exercise. Corresponding correlation between PAT and DBP was 0.25 ± 0.35, −0.74 ± 0.23 and 0.39 ± 0.41. Conclusion: The results confirm PAT as a potential main feature to track changes in SBP. The relationship between DBP and PAT varied between exercise modalities, with the sign of the correlation changing from negative to positive between type of exercise modality. Thus, we hypothesize that simple test protocols fail to demonstrate the complex relationship between PAT and BP with emphasis on DBP.
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Category

Academic article

Language

English

Author(s)

  • Sondre Heimark
  • Ole Marius Hoel Rindal
  • Trine Margrethe Seeberg
  • Alexey Stepanov
  • Elin Sundby Boysen
  • Kasper Bøtker-Rasmussen
  • Nina Knudsen Mobæk
  • Camilla Lund Søraas
  • Aud Eldrid Stenehjem
  • Fadl El Mula Mohamed Fadl El Mula
  • Bård Waldum-Grevbo

Affiliation

  • SINTEF Digital / Smart Sensors and Microsystems
  • University of Oslo
  • Oslo University Hospital
  • Diverse norske bedrifter og organisasjoner

Year

2021

Published in

Blood Pressure Monitoring

ISSN

1359-5237

Volume

27

Issue

2

View this publication at Norwegian Research Information Repository