# An intubated adult with severe traumatic brain injury has an intracranial pressure (ICP) of 24 mm Hg and a mean arterial pressure of 78 mm Hg. No signs of imminent herniation are present. Complete the initial management plan.

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> subject: Medical Emergencies  
> category: PA

## Question

An intubated adult with severe traumatic brain injury has an intracranial pressure (ICP) of 24 mm Hg and a mean arterial pressure of 78 mm Hg. No signs of imminent herniation are present. Complete the initial management plan.

The ICP is ::선택::below the treatment thresholdabove the 22 mm Hg treatment thresholdsafe because the MAP is normalonly a diagnostic value that requires no response. Position the client ::선택::about 30 degrees with the neck neutral and midlineflat with the neck flexed60 degrees with the neck rotatedTrendelenburg with the head turned, target a CPP of ::선택::40–50 mm Hgabove 80 mm Hg60–70 mm Hgexactly 100 mm Hg, and ::선택::prolonged prophylactic hyperventilation throughout acute carenormocapnia, reserving brief hyperventilation for threatened herniationPaCO2 below 25 mm Hg until the ICP monitor is removedunchanged ventilator settings despite neurologic deterioration.

## Explanation

An ICP of 24 mm Hg is above the recommended treatment threshold of 22 mm Hg. Elevate the head of the bed about 30 degrees and keep the neck neutral and midline to support cerebral venous drainage while avoiding hypotension. Target CPP is 60–70 mm Hg; with MAP 78 and ICP 24, the current CPP is only 54 mm Hg. Prolonged prophylactic hyperventilation is not recommended. Hyperventilation is reserved as a short temporizing measure for neurologic deterioration or threatened herniation while definitive interventions are arranged.

## In-depth explanation

Correct Answer
ICP 24 mm Hg requires treatment. Position the head about 30 degrees with the neck neutral and midline, target CPP 60–70 mm Hg, and avoid prophylactic hyperventilation when herniation is not present.

Why It Fits
CPP equals MAP minus ICP, so this client’s CPP is 78 − 24 = 54 mm Hg. That is below the recommended 60–70 mm Hg range. Supporting venous drainage and correcting factors that raise ICP are immediate priorities while the team evaluates definitive treatment.

Clinical Picture
Think of the skull as a fixed box. Blood, brain tissue, and cerebrospinal fluid share the same space. A neutral neck and elevated head improve the exit path for venous blood, while an adequate MAP preserves blood flow into the brain.

Memory Link
ICP above 22: treat. CPP 60–70: perfuse. Hyperventilation: bridge only for herniation.

NCLEX Rule
Calculate CPP whenever MAP and ICP are provided. Do not chase a high CPP above 70 with excessive fluids or vasopressors, and do not use prolonged hyperventilation as routine prevention because cerebral vasoconstriction can reduce brain blood flow.

Why the Alternatives Fail
Observation alone ignores an ICP above the treatment threshold. A flat bed or a flexed or rotated neck can impair venous drainage. A CPP of 40–50 mm Hg is inadequate, whereas aggressive targets above 70 may increase pulmonary complications. Prolonged marked hypocapnia is not routine therapy.

Sources
1ACS: Best Practices Guidelines for Traumatic Brain Injury
2Brain Trauma Foundation: Severe TBI Guidelines

## Clinical scenario

The calculated cerebral perfusion pressure (CPP) is 54 mm Hg. The nurse is implementing initial measures while the trauma and neurosurgical teams evaluate the cause of intracranial hypertension.

## Key concepts

- **CPP** — Cerebral perfusion pressure = MAP - ICP; adult target 60-70 mmHg.
- **normocapnia** — PaCO2 35-40 mmHg; avoid hyperventilation in TBI except briefly for herniation.
- **EVD** — External ventricular drain; allows CSF drainage and ICP monitoring.

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