Lit Matters #2: Ventilation in severe head trauma patients

Severe acute brain injury changes the usual ventilation tradeoffs: lung-protective settings that help ARDS may worsen outcomes when intracranial pressure and PaCO2 control are central. In intubated patients with TBI, SAH, intracerebral hemorrhage, or ischemic stroke without ARDS, the PROLABI trial favored more traditional ventilation over low tidal volume plus higher PEEP.

Ventilation in Severe Brain Injury

• Different physiology problem: Severe brain injury is not routine ARDS physiology; small rises in PaCO2 can increase cerebral blood volume and intracranial pressure, making standard low-tidal-volume thinking less automatically safe.
• PROLABI patient population: The trial focused on intubated patients with acute severe brain injury without ARDS, including TBI, subarachnoid hemorrhage, intracerebral hemorrhage, and ischemic stroke with depressed consciousness.
• Headline ventilator contrast: The tested strategy compared low tidal volume under 6 mL/kg with PEEP 8 against more traditional ventilation over 8 mL/kg with PEEP 4, while both arms targeted normocapnia.
• Composite outcome signal: The primary 28-day composite of death, ventilator dependence, and ARDS was worse with lung-protective ventilation, a clinically meaningful signal that argues against one-size-fits-all practice.
• Mortality and disability concern: Mortality was 28.9% versus 15.1%, and 6-month Glasgow Outcome Scale results also favored traditional ventilation. We get into what this should change in the episode.
• Practice-changing caution: Early trial stoppage limits certainty, but the study still gives real pause before reflexively applying ARDS-style ventilation to every severe head trauma patient, especially outside established ARDS.