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Difficulty: Very hardReduction of Risk Potential

A client is admitted to the neuro-intensive care unit following a severe traumatic brain injury and has an external ventricular drain (EVD) in place. During the current assessment, the nurse notes the client's Glasgow Coma Scale (GCS) score has decreased from 1313 to 99. The vital signs are: blood pressure 190/60190/60 mm Hg, heart rate 4848 beats/minute, and irregular respirations. The most recent arterial blood gas (ABG) analysis reveals a pH of 7.307.30, PaCO 2_2 of 5454 mm Hg, and HCO 3−_3^- of 2525 mEq/L. Which of the following immediate interventions should the nurse implement to reduce the risk of secondary brain injury? Select all that apply.

  1. Elevate the head of the bed to 3030 degrees while maintaining the client's neck in a neutral, midline alignment.Answer
  2. Verify that the zero reference point of the external ventricular drain is leveled with the tragus of the ear.Answer
  3. Prepare for the immediate administration of prescribed hyperosmolar therapy, such as intravenous mannitol.Answer
  4. D
    Place the client in a flat, supine position to maximize mean arterial pressure and cerebral perfusion.
  5. E
    Adjust the mechanical ventilator settings to aggressively decrease the PaCO 2_2 level to 20−2520-25 mm Hg.
  6. F
    Obtain a 12-lead electrocardiogram to evaluate the etiology of the new-onset bradycardia before notifying the healthcare provider.

Answer

The correct interventions are elevating the head of the bed with midline neck alignment, leveling the external ventricular drain at the tragus, and preparing to administer hyperosmolar therapy.
The client is exhibiting a drop in Glasgow Coma Scale and Cushing's triad (hypertension with a widened pulse pressure, bradycardia, and irregular respirations), which are late signs of increased intracranial pressure and impending brain herniation. Furthermore, the arterial blood gas shows respiratory acidosis (PaCO 2_2 of 5454 mm Hg), a potent cerebral vasodilator that further increases intracranial pressure. Immediate risk reduction interventions include elevating the head of the bed to 3030 degrees with a neutral neck alignment to promote jugular venous drainage, verifying the external ventricular drain is correctly leveled at the Foramen of Monro (tragus of the ear) to ensure accurate drainage and monitoring, and preparing to administer hyperosmolar therapy (such as mannitol) to draw fluid out of the cerebral tissue.

Step-by-Step Solution

1
Analyze the client's vital signs and neurological assessment.
The GCS drop, widened pulse pressure (190/60190/60 mm Hg), bradycardia (4848 beats/minute), and irregular respirations indicate Cushing's triad.
Identifying Cushing's triad confirms a life-threatening increase in intracranial pressure (ICP) and impending brain herniation.
2
Interpret the arterial blood gas (ABG) values.
The ABG shows uncompensated respiratory acidosis with a PaCO 2_2 of 5454 mm Hg.
Elevated PaCO 2_2 causes cerebral vasodilation, which increases cerebral blood volume and further elevates ICP.
3
Determine the highest priority interventions to reduce ICP.
Actions must focus on improving venous drainage, accurately monitoring/draining CSF, and reducing cerebral edema.
These steps mitigate the immediate risk of secondary brain injury and fatal herniation.
4
Select the appropriate clinical actions from the provided options.
Elevating the head of the bed, leveling the drain, and preparing mannitol are correct.
These interventions directly address the elevated ICP while avoiding contraindicated actions like flat positioning or extreme hyperventilation.

Key Concept

Mitigating the risk of secondary brain injury and herniation in clients with elevated intracranial pressure.
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Topics

Reduction of Risk Potential

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