A client is at risk for increased intracranial pressure (ICP). Which of the following would be the priority for the nurse to monitor?

Question

BlackTom AI · Accepted Answer

Unequal pupil size is an early, focal sign of rising intracranial pressure (ICP) because it indicates compression of the oculomotor nerve (cranial nerve III) from a mass effect or impending brain herniation.

1. Relevant knowledge points and concepts
- ICP elevation causes mass effect that can compress adjacent brain structures. Compression of CN III leads to ipsilateral pupillary dilation and sluggish or absent light reflex. A unilateral dilated pupil is a lateralizing, potentially emergent sign.
- Classic systemic signs of advanced ICP include Cushing’s triad: increased systolic blood pressure with widened pulse pressure, bradycardia, and irregular respirations. Tachycardia and falling systolic blood pressure are not typical early signs of increased ICP.
- Neurologic assessments (level of consciousness, pupillary size and reactivity, motor responses) are the priority when ICP is a risk.

2. Step-by-step reasoning
- Determine which sign most directly reflects acute focal brain compression: unequal pupils directly reflect cranial nerve compression from a localized mass effect.
- Compare each option to known ICP physiology: decreasing body temperature is not a recognized sign of increased ICP; decreasing systolic blood pressure is contrary to the hypertensive response seen in Cushing’s triad; tachycardia is not expected (bradycardia is more typical).
- Therefore, the most urgent parameter to monitor is pupil size and reactivity.

3. Intermediate steps (logical sequence)
- ICP rises → brain tissue shifts/compresses structures → CN III compression → ipsilateral pupillary dilation and loss of reactivity.
- Observe unequal pupils → suspect herniation risk → immediate intervention needed.

4. Why the correct answer is correct
- Unequal pupil size is a direct neurologic indicator of increased localized pressure and impending herniation; it requires immediate attention and is thus the priority monitor.

5. Why the other options are incorrect
- Decreasing body temperature: not an indicator of rising ICP.
- Decreasing systolic blood pressure: opposite of the hypertensive component of Cushing’s response; hypotension more often worsens cerebral perfusion but is not the priority sign of ICP increase.
- Tachycardia: inconsistent with the bradycardia of Cushing’s triad and not a primary sign of increased ICP.

6. Conclusion
- The priority to monitor is unequal pupil size. This matches and confirms the provided correct answer: Unequal pupil size.

A client is at risk for increased intracranial pressure (ICP). Which of the following would be the priority for the nurse to monitor?单项选择题

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