Frequency-domain vs continuous-wave near-infrared spectroscopy devices: a comparison of clinically viable monitors in controlled hypoxia

The Near-infrared spectroscopy (NIRS) has not been adopted as a mainstream monitoring modality in acute neurosurgical care due to concerns about its reliability and consistency. However, improvements in NIRS parameter recovery techniques are now available that may improve the quantitative accuracy o...

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Bibliographic Details
Published in:Journal of clinical monitoring and computing 2017-10, Vol.31 (5), p.967-974
Main Authors: Davies, David James, Clancy, Michael, Lighter, Daniel, Balanos, George M., Lucas, Samuel John Edwin, Dehghani, Hamid, Su, Zhangjie, Forcione, Mario, Belli, Antonio
Format: Article
Language:English
Subjects:
Anesthesiology
Change detection
Critical Care Medicine
Devices
Health Sciences
Hypoxia
Infrared spectra
Infrared spectroscopy
Intensive
Medicine
Medicine & Public Health
Near infrared radiation
Original Research
Partial pressure
Recovery
Saturation
Spectrum analysis
Statistics for Life Sciences
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Summary:The Near-infrared spectroscopy (NIRS) has not been adopted as a mainstream monitoring modality in acute neurosurgical care due to concerns about its reliability and consistency. However, improvements in NIRS parameter recovery techniques are now available that may improve the quantitative accuracy of NIRS for this clinical context. Therefore, the aim of this study was to compare the abilities of a continuous-wave (CW) NIRS device with a similarly clinically viable NIRS device utilising a frequency-domain (FD) parameter recovery technique in detecting changes in cerebral tissue saturation during stepwise increases of experimentally induced hypoxia. Nine healthy individuals (6M/3F) underwent a dynamic end-tidal forced manipulation of their expiratory gases to induce a stepwise induced hypoxia. The minimum end-tidal oxygen partial pressure (EtO 2 ) achieved was 40 mm Hg. Simultaneous neurological and extra-cranial tissue NIRS reading were obtained during this protocol by both tested devices. Both devices detected significant changes in cerebral tissue saturation during the induction of hypoxia (CW 9.8 ± 2.3 %; FD 7.0 ± 3.4 %; Wilcoxon signed rank test P  
ISSN:1387-1307
1573-2614
DOI:10.1007/s10877-016-9942-5