Rhenis Nursing Rhenis Nursing
HESI Med -Surg 2025 Exam- 3
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Hint : 🧑‍⚕️Prioritize symptoms that signal central nervous system involvement over common or chronic side effects.

Correct Answers:

  • Double vision.


Rationale :

👁️Double vision (diplopia) is a serious symptom of phenytoin toxicity, which affects the central nervous system and requires prompt assessment.

🧪Phenytoin has a narrow therapeutic range, meaning even slight increases in serum levels can lead to significant toxicity.

⚠️Visual changes like diplopia, along with symptoms such as ataxia and nystagmus, can indicate early toxicity and must be reported immediately.

🧠Failure to act on this finding could result in worsening neurological function, including seizures or permanent damage.

📌Core Message

Double vision is a critical indicator of phenytoin toxicity, requiring immediate intervention to prevent neurologic complications due to the drug's narrow therapeutic range.

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