Feasibility of cerebral near‐infrared spectroscopy monitoring in the pre‐hospital environment

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Traumatic brain injury (TBI) is a significant cause of death and severe disability from trauma. Pre-hospital care of patients with TBI may be aided by non-invasive monitoring of cerebral tissue oxygenation. This pilot observational study was designed to assess if cerebral tissue oximetry using near-infrared spectroscopy (NIRS) is feasible in the pre-hospital and transport environment. After ethics committee review, we undertook a feasibility trial in healthy volunteers, transported by road ambulance or helicopter, to assess if monitoring signals could be obtained in the outside environment and during patient transport. A total of 33 road ambulance transports and 32 helicopter transports were undertaken. For monitoring commenced outdoors, 33 of 66 probes applied (50%) provided adequate monitoring signal. For road transports, 33 out of 33 transports (100%) resulted in successful bilateral monitoring for more than 70% of the sampling period. For helicopter transports, four transports were cut short by battery failure during the mission and 24 of 28 transports (85.7%) resulted in successful bilateral monitoring for more than 70% of the sampling period. While patient and transport platform movement did not impact on monitoring signals, exposure to ambient light provided a challenge in obtaining monitoring signals that is nevertheless manageable with increased probe shielding. NIRS monitoring is feasible in the pre-hospital environment, opening up the possibility for further research of the role of this modality in this setting.