Brain Oxygenation During Prehospital Anesthesia: an Observational Study

Inclusion Criteria: * sedation or anesthesia provided to facilitate endotracheal intubation, performed by Helicopter Emergency Medical Services (HEMS) team regardless of the reason Exclusion Criteria: * Ongoing cardiopulmonary resuscitation at the time of intubation * Physical barrier for near-infrared spectroscopy measuring (e.g. forehead laceration) * HEMS unit does not escort patient to the hospital (exception: in case of death on scene after inclusion, patient is included) * Workload too high to ensure standard level of clinical care during the study * For interviews: no competence in Finnish, Swedish or English