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Cerebral oximetry in dead subjects
G Schwarz1, G Litscher, R Kleinert
1Department of Anesthesiology, University of Graz, Austria.
Journal of Neurosurgical Anesthesiology
|July 1, 1996
Summary
Near-infrared spectroscopy measures cerebral oxygenation. This study found concerning validity issues with the INVOS 3100 system
Area of Science:
- Neuroscience
- Medical Imaging
- Biomedical Engineering
Background:
- Near-infrared spectroscopy (NIRS) is a non-invasive technique for monitoring cerebral oxygenation.
- Regional oxygen saturation (rSO2) is a key metric assessed by NIRS.
Purpose of the Study:
- To validate the accuracy of the INVOS 3100 cerebral oximeter.
- To assess the reliability of NIRS-derived rSO2 measurements in deceased subjects.
Main Methods:
- Regional oxygen saturation (rSO2) was measured using an INVOS 3100 cerebral oximeter.
- Measurements were taken in 18 deceased subjects (post-mortem, 19.8 ± 18.2 hours) and 15 healthy adults.
- Post-mortem brain tissue rSO2 was also measured after autopsy in five subjects.
Main Results:
- Deceased subjects showed a mean rSO2 of 51.0 ± 26.8%, with a wide range (6-88%).
- Healthy controls had a mean rSO2 of 68.4 ± 5.2% (range 60-76%).
- Six of 18 deceased subjects exhibited rSO2 values ≥ 60%, overlapping with healthy adult ranges.
Conclusions:
- Findings raise significant concerns regarding the validity of cerebral rSO2 data obtained with the INVOS 3100 system in adults.
- The overlap in rSO2 values between deceased and healthy subjects questions the method's specificity.
- Further validation is needed to ensure the reliability of NIRS for cerebral oxygenation monitoring.