Introduction Patients with severe brain injury are often restricted to bed rest during the early period of brain injury which may lead to unwanted secondary complications. There is lack of evidence of when to initiate the first mobilisation. The Sara Combilizer® is an easy and efficient tool for mobilising patients with severe injuries, including brain injury. Through a randomised cross-over trial the investigators will investigate the impact of early mobilisation on patients with severe acquired brain injury caused by traumatic brain injury, subarachnoid brain injury or intracranial haematoma. The investigators hypothesise that mobilisation using the Sara Combilizer® does not affect partial oxygenation of brain tissue.
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Change in partial oxygenation of brain tissue (PbtO2)
Timeframe: Head-up tilt PbtO2 (delta between supine and standing values) compared to sedentary PbtO2 (delta by subtracting two values measured with the same duration and distance) measured continuously after 24 and 48 hours from stable intracranial pressure