In practice, the clinician relies on two cerebral monitoring devices during surgical interventions: an EEG monitor reflecting functional changes by measuring cortical synaptic activity, and a cerebral NIRS monitor reflecting the balance between contribution and consumption of tissue oxygen. These two techniques are robust and proven. However, their methods of implementation are controversial within the medical community. While a consensus exists on the need to improve the selectivity of cerebral NIRS [ii], ], the effectiveness of an EEG index to correctly reflect the state of consciousness of a patient [iii] is questioned, along with synergies of a combined NIRS and EEG approach are designed.
In response to the need expressed by clinicians, Braindex combines on a single sensor a patented 3D spectro-imaging to target measurements of tissue oxygen saturation on the cerebral cortex, with a processed EEG focused on oversedation episodes.
[i] Clegg et al. Lancet 2013
[ii] Sophie N. Davie, B.Sc.,* Hilary P. Grocott. Impact of Extracranial Contamination on Regional Cerebral Oxygen Saturation. A Comparison of Three Cerebral Oximetry Technologies. Anesthesiology, V 116 • No 4
[iii] Sleigh JW. Depth of anesthesia: Perhaps the patient isn’t a submarine. Anesthesiology 2011;115:1149–50.