Simultaneous estimation of arterial and venous oxygen saturation using a camera

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Abstract

Optical monitoring of arterial blood oxygenation, SpO2, using cameras has recently been shown feasible by measuring the relative amplitudes of the remotely sensed PPG waveforms captured at different wavelengths. SvO2 measures the venous blood oxygenation which together with SpO2 provides an indication of tissue oxygen consumption. In contrast to SpO2 it usually still requires a blood sample from a pulmonary artery catheter. In this work we present a method which suggests simultaneous estimation of SpO2 and SvO2 with a camera. Contrary to earlier work, our method does not require external cuffs leading to better usability and improved comfort. Since the arterial blood varies synchronously with the heart rate, all frequencies outside the heart rate band are typically filtered out for SpO2 measurements. For SvO2 estimation, we include intensity variations in the respiratory frequency range since respiration modulates venous blood due to intrathoracic pressure variations in the chest and abdomen. Consequently, under static conditions, the two dominant components in the PPG signals are respiration and pulse. By measuring the amplitude ratios of these components, it seems possible to monitor both SpO2 and SvO2 continuously. We asked healthy subjects to follow an auditory breathing pattern while recording the face and hand. Results show a difference in estimated SpO2 and SvO2 values in the range 5-30 percent for both anatomical locations, which is normal for healthy people. This continuous, non-contact, method shows promise to alert the clinician to a change in patient condition sooner than SpO2 alone.

Original languageEnglish
Title of host publicationOptical Diagnostics and Sensing XVIII
Subtitle of host publicationToward Point-of-Care Diagnostics
EditorsG.L. Coté
Place of PublicationBellingham
PublisherSPIE
ISBN (Electronic)9781510614871
ISBN (Print)978-1-5106-1487-1
DOIs
Publication statusPublished - 20 Feb 2018
EventOptical Diagnostics and Sensing XVIII: Toward Point-of-Care Diagnostics - San Francisco, United States
Duration: 29 Jan 201830 Jan 2018

Publication series

NameProceedings of SPIE
Volume10501
ISSN (Print)0277-786X

Conference

ConferenceOptical Diagnostics and Sensing XVIII: Toward Point-of-Care Diagnostics
CountryUnited States
CitySan Francisco
Period29/01/1830/01/18

Keywords

  • Blood oxygen saturation
  • Infrared
  • Remote sensing
  • SpO2
  • SvO2
  • blood oxygen saturation
  • SvO(2)
  • infrared
  • SpO(2)

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