Extracting instantaneous respiratory rate from multiple photoplethysmogram respiratory-induced variations

Parastoo Dehkordi (Corresponding Author), Ainara Garde, Behnam Molavi, J. Mark Ansermino, Guy A. Dumont

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

In this study, we proposed a novel method for extracting the instantaneous respiratory rate (IRR) from the pulse oximeter photoplethysmogram (PPG). The method was performed in three main steps: (1) a time-frequency transform called synchrosqueezing transform (SST) was used to extract the respiratory-induced intensity, amplitude and frequency variation signals from PPG, (2) the second SST was applied to each extracted respiratory-induced variation signal to estimate the corresponding IRR, and (3) the proposed peak-conditioned fusion method then combined the IRR estimates to calculate the final IRR. We validated the implemented method with capnography and nasal/oral airflow as the reference RR using the limits of agreement (LOA) approach. Compared to simple fusion and single respiratory-induced variation estimations, peak-conditioned fusion shows better performance. It provided a bias of 0.28 bpm with the 95% LOAs ranging from -3.62 to 4.17, validated against capnography and a bias of 0.04 bpm with the 95% LOAs ranging from -5.74 to 5.82, validated against nasal/oral airflow. This algorithm would expand the functionality of a conventional pulse oximetry beyond the measurement of heart rate and oxygen saturation to measure the respiratory rate continuously and instantly.

Original languageEnglish
Article number948
Pages (from-to)1-10
JournalFrontiers in Physiology
Volume9
Issue numberJuly
DOIs
Publication statusPublished - 18 Jul 2018

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Respiratory Rate
Capnography
Nose
Oximetry
Pulse
Heart Rate
Oxygen

Keywords

  • Instantaneous respiratory rate
  • Photoplethysmogram
  • Pulse oximetry
  • Respiratory-induced variation
  • Synchrosqueezing transform

Cite this

Dehkordi, Parastoo ; Garde, Ainara ; Molavi, Behnam ; Ansermino, J. Mark ; Dumont, Guy A. / Extracting instantaneous respiratory rate from multiple photoplethysmogram respiratory-induced variations. In: Frontiers in Physiology. 2018 ; Vol. 9, No. July. pp. 1-10.
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Extracting instantaneous respiratory rate from multiple photoplethysmogram respiratory-induced variations. / Dehkordi, Parastoo (Corresponding Author); Garde, Ainara; Molavi, Behnam; Ansermino, J. Mark; Dumont, Guy A.

In: Frontiers in Physiology, Vol. 9, No. July, 948, 18.07.2018, p. 1-10.

Research output: Contribution to journalArticleAcademicpeer-review

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