A client in the neuro ICU 6 hours after severe TBI has an IC… | MyMerci
NCLEX-RNPA
Question
A client in the neuro ICU 6 hours after severe TBI has an ICP monitor reading 24 mm Hg sustained for 8 minutes and MAP 78 mm Hg. Which intervention should the nurse implement FIRST?
1Verify head-of-bed at 30 degrees and that the neck is in neutral midline alignment✓ Correct answer
2Administer 23.4 percent hypertonic saline bolus
3Hyperventilate to a target PaCO2 of 28 mm Hg
4Decrease propofol to allow a neurologic exam
Explanation
Tier-1 ICP control begins with optimizing simple physiologic factors: HOB elevation 30 degrees, neutral neck alignment to promote jugular drainage, adequate sedation/analgesia, and normocapnia. These are verified BEFORE escalating to hyperosmolar therapy. Hypertonic saline is appropriate but is a tier-2 intervention. Prophylactic hyperventilation to PaCO2 below 30 causes cerebral vasoconstriction and ischemia and is reserved for impending herniation. Lightening sedation increases ICP.
In-depth explanation
Brain Trauma Foundation tier-1 bundle: position, sedation, normocapnia, normothermia, CSF drainage. Reflex hyperventilation is OUT of guidelines except as a brief bridge to surgery.
Clinical scenario
GCS 7T, intubated, sedated with propofol. HOB at 30 degrees, neck midline. PaCO2 38 mm Hg on mechanical ventilation. Most recent CPP 54 mm Hg.
Key concepts
cerebral perfusion pressure — CPP = MAP - ICP; target 60-70 mm Hg in adult TBI.
hyperosmolar therapy — Hypertonic saline or mannitol used to reduce cerebral edema.
Monro-Kellie doctrine — Fixed cranial volume principle: increase in one component (blood, CSF, brain) raises ICP unless another decreases.