In the initial management of moderate-severe TBI, what is a critical measure to prevent secondary brain injury?

• A. Securing the airway and ensuring adequate oxygenation
• B. Immediate surgical decompression
• C. Administering high-dose antibiotics prophylactically
• D. Delaying monitoring of ICP

Answer: (C)

Securing the airway and ensuring adequate oxygenation is the most important step in the early management of moderate-severe TBI because secondary brain injury is driven largely by hypoxia and reduced cerebral perfusion. When the brain is injured, neurons are highly vulnerable to even short periods of low oxygen; providing a protected airway and reliable ventilation helps keep blood oxygen levels high, supports cerebral blood flow, and reduces the risk of further neuronal damage. In practice, intubation is indicated for patients who cannot protect their airway or who have substantial brain injury with risk of slow or irregular breathing, and ventilation should aim for normal oxygenation and careful CO2 levels to avoid either hypoventilation or excessive hyperventilation, both of which can worsen brain injury.

Antibiotics given prophylactically across all moderate to severe TBIs do not prevent secondary brain injury and carry risks; they’re reserved for specific circumstances such as open skull fractures or penetrating injuries where infection risk is elevated. Immediate surgical decompression is necessary only for lesions with mass effect or deteriorating neurologic status, not as a universal initial measure. Monitoring intracranial pressure is important to guide ongoing therapy and should not be delayed, as rising ICP itself contributes to secondary injury and requires timely intervention.