Journal of Clinical Monitoring and Computing

, Volume 17, Issue 7, pp 385–391

Comparison of Two Spatially Resolved NIRS Oxygenation Indices

Authors

  • Roy E. Gagnon
    • Department of Pediatrics, Anesthesia, Surgery, Children’s & Women’s Health CentreUniversity of British Columbia
  • Andrew J. Macnab
    • Department of Pediatrics, Anesthesia, Surgery, Children’s & Women’s Health CentreUniversity of British Columbia
  • Faith A. Gagnon
    • Department of Pediatrics, Anesthesia, Surgery, Children’s & Women’s Health CentreUniversity of British Columbia
  • Derek Blackstock
    • Department of Pediatrics, Anesthesia, Surgery, Children’s & Women’s Health CentreUniversity of British Columbia
  • Jacques G. LeBlanc
    • Department of Pediatrics, Anesthesia, Surgery, Children’s & Women’s Health CentreUniversity of British Columbia
Article

DOI: 10.1023/A:1026274124837

Cite this article as:
Gagnon, R.E., Macnab, A.J., Gagnon, F.A. et al. J Clin Monit Comput (2002) 17: 385. doi:10.1023/A:1026274124837

Abstract

We compared the percentage haemoglobin oxygenation indices from two near infrared spectrophotometers (NIRS) to determine whether the devices reported similar changes in response to induced changes in oxygenation. Methods.24 healthy juvenile swine undergoing cardiac bypass surgery had INVOS 5100 and NIRO-300 sensors applied to the brow. Induced events included circulatory arrest, altered blood flow rate, core cooling, and re-warming. Results.The average data collection was 4 hours 36 minutes and had an r = 0.82 mean correlation between the INVOS and NIRO. The total resting baseline collection from all trials (8,590 pairs) had a correlation of r= 0.62. The average relationship between the INVOS and NIRO was non-linear: an INVOS regional oxygen saturation index (rSO2) of 0% was equivalent to a NIRO tissue oxygenation index (TOI) of 36.2%; values were equal at 56.8%; and an (rSO2) of 100% was equivalent to a TOI 85.9%. There was good or excellent agreement (r> 0.5) between the (rSO2) and TOI patterns of change during induced events in 96% of trials. The INVOS and N IRO were most closely correlated when an attenuation filter was used to obtain identical emitter/detector separations. Conclusions.There was close agreement between the INVOS 5100 and NIRO-300 in response to major physiological change, although absolute values of (rSO2) and TOI were not identical. There was less agreement during baseline measurements or minimal physiologic change.

Infrared spectrophotometrycerebrovascular circulationoxyhemoglobin

Copyright information

© Kluwer Academic Publishers 2002