Neuroanesthesia & neurocritical care
Near‐infrared spectroscopy to measure brain oxygenation: A comparison of measurements on the skin, skull and dura mater
Main finding · ScO2, dura mater vs skinResult — go to the resultMedian difference −25% CI −35.6% to −1.2%Authors' conclusion
In adults undergoing craniotomy, NIRS-based ScO2 measured on the dura mater did not reach statistically significantly lower values than ScO2 measured on the skin, whereas values on the skull were lower than on the skin, indicating a contribution from scalp tissue to the signal.
Study context
- Population
- Adults scheduled for elective craniotomy under GAeach measured at every site
- Participants
- 17 adults
- Exposure
- Near-infrared spectroscopy (NIRS) ScO2 measured on the dura mater and skull vs forehead skin
- Outcome
- Difference in ScO2 measured on the dura mater vs on the skin
Main finding
ScO2, dura mater vs skin
Median difference
−25%
CI −35.6% to −1.2%
P = 0.052
By group
Dura mater vs Skin
median difference −25% (CI −35.6% to −1.2%); P = 0.052
As reported in the abstract
Observational data: associations, not effects.
Further findings
Median
| Outcome | Skin | Skull | Median difference (CI) | P value | |
|---|---|---|---|---|---|
| ScO2, skull vs skinLower on the skull | 75% (5%-95% range 61%–94%) | 63% (5%-95% range 43%–79%) | −10% (−20.8 to −3.0) | P = 0.0002 | |
| −30−20−10010Difference (linear scale) |
Original publication
Near‐infrared spectroscopy to measure brain oxygenation: A comparison of measurements on the skin, skull and dura mater. Acta Anaesthesiol Scand. Published 25 October 2023. doi:10.
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