CONTINUOUS-WAVE NEAR-INFRARED SPECTROSCOPY IS NOT RELATED TO BRAIN TISSUE OXYGEN TENSION
Keywords:
near-infrared spectroscopy, brain oxygen tension, brain trauma, subarachnoid haemorrhage, brain deathAbstract
Actuality. Near-infrared spectroscopy (NIRS) has gained acceptance for cerebral monitoring, especially during cardiac surgery, though there are few data showing its validity. Aim. We therefore aimed to correlate invasive brain tissue oxygenmeasurements (PtiO2) with the corresponding NIRS-values (regional oxygen saturation, rSO2). We also studied whether NIRS was able to detect ischemic events, defined as a PtiO2- value of <15 mmHg. Materials and methods. Eleven patients were studied with invasive brain tissue oxygen monitoring and continuous-wave NIRS. PtiO2-correlation with corresponding NIRS-values was calculated. We found no correlation between PtiO2 — and NIRS-readings. Measurement of rSO2 was no better than flipping a coin in the detection of cerebral ischemia when a commonly agreed ischemic PtiO2 cut-off value of <15 mmHg was chosen. Results. Continuous-wave-NIRS (CW-NIRS) was unable to reliably detect ischemic cerebral episodes, defined as a PtiO2 value <15 mmHg. Displayed NIRSvalues did not correlate with invasively measured Pti2-values. Conclusion. CW-NIRS should not be used for the detection of cerebral ischemia.
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