brain-injured patients extubation readiness study

Conditions: Mechanical Ventilator Weaning; Acute Brain Injury; Altered Level of Consciousness; Mechanical Ventilation; Airway Control

Summary: the biper study is a stepped wedge cluster randomised clinical trial aiming to decrease extubation failure in critically-ill brain-injured patients with residual impaired consciousness using a simple clinical score.

severe brain-injured patients need mechanical ventilation with tracheal intubation. after treatment of the acute neurological condition, weaning of the mechanical ventilation has to be initiated notably to prevent ventilator associated pneumonia and others complications. nevertheless, extubation failure is very common in this population due to residual neurological impairment with airway control alteration. guidelines about weaning of mechanical ventilation and extubation exclude brain-injured patients with a residual impaired consciousness. in 2017, a simple and pragmatic extubation readiness clinical score was validated in a prospective observational cohort study of 140 brain injured patients. (godet et al. anesthesiology. 2017 jan;126(1):104-114) in this study, brain injured patients with residual impaired consciousness who succeeded a spontaneous breathing trial were extubated. in multivariate analysis, 4 clinical elements were associated with extubation success. a prediction score was determined using the odds ratio such as followed : 1. deglutition: 3 points if present 2. gag reflex: 4 points if present 3. cough: 4 points if present 4. crs-r score, visual item \> 2, 3 points if present, 1 point if not for a cut-off value of 9, extubation failure could be predicted with a sensibility of 84%, a specificity of 75%, a positive predictive value of 89% and a negative predictive value of 66%. in order to participate, brain-injured patients will have to succeed a spontaneous breathing trial and meet all inclusion criteria, including not being able to obey to simple orders without sedation. using a stepped wedge randomisation process with intensive care units as clusters, patients will be weaned and extubated under usual care or using the extubation readiness clinical score. the authors' hypothesis is that this clinical score will allow physicians to extubate patients at the right time interval and prevent extubation failure in this frail population.

Eligibility criteria:
inclusion criteria: * acute cerebral lesion with a glasgow coma scale \< 13 needing admission in icu and mechanical ventilation with tracheal intubation for neurological cause : cerebrovascular stroke either ischemic or hemorrhagic including aneurysmal subarachnoid hemorrhage, traumatic brain injury or anoxo ischemic encephalopathy after cardiac arrest * mechanical ventilation more than 48 hours * 18 to 75 years old * neurological stability with no intracranial hypertension with minimal sedation * glasgow coma scale motor response \< 6 * spontaneous breathing trial succeeded * first extubation attempt exclusion criteria: * posterior cranial fossa lesion * admission for status epilepticus or central nervous system infection * spinal cord injury (tetraplegia or paraplegia) * uncontrolled status epilepticus or uncontrolled central nervous system infection * life expectancy less than 48 hours or withdrawal of life sustaining therapy * chronic respiratory failure * more than 3 failed spontaneous breathing trials * chest trauma (more than 2 broken ribs / broken sternum / with an indication of open thoracic surgery) * surgery planned within 7 days * tracheotomy * previous compromised upper airway permeability * pregnant or breastfeeding woman * adult under the protection of the law or without social assurance system * inclusion in another clinical study about ventilation weaning

Keywords: coma intensive care units critical care stroke traumatic brain injury anoxic ischemic encephalopathy glasgow coma scale