You are administering medications to a patient through an intravenous (IV) line. Suddenly, you notice that the IV site is becoming red, swollen, and painful. You suspect extravasation, a potentially serious complication. Which of the following medications is most likely to cause severe tissue damage and necrosis if extravasation occurs?

Appeared in: NORCET 6 Prelims -2024

Explanation

Phenytoin is a potent vesicant, a type of drug that can cause severe tissue damage if it leaks outside the vein.
Its primary mechanism of injury is its high alkalinity (pH of approximately 12), which causes a direct and severe chemical burn to the surrounding tissue.
Extravasation of phenytoin can lead to serious complications, including tissue necrosis (death) and a specific condition known as Purple Glove Syndrome, which involves pain, discoloration, and swelling of the limb.
The diluent used in its formulation, propylene glycol, also contributes to the irritation and tissue damage.

Option A: Diazepam is classified as an irritant, not a severe vesicant. It can cause pain and inflammation at the IV site (phlebitis) but is not associated with the extensive tissue necrosis seen with phenytoin.
Option B: Although epinephrine is a vesicant, its mechanism of injury is different. It causes intense vasoconstriction, leading to ischemia (lack of blood flow) and subsequent tissue death, rather than a direct chemical burn from high pH.
Option D: Ranitidine is considered a non-vesicant. It does not have the properties that cause significant tissue damage if it extravasates.

Visual 1: Photograph - A picture of Purple Glove Syndrome in a patient's hand after phenytoin extravasation. This image would highlight the characteristic dark purple discoloration, significant swelling (edema), and blistering, helping to visualize the severity of this specific complication.

Clinical Relevance

Nursing practice connection: Use the key finding related to Vesicant medications and extravasation management to guide bedside assessment, documentation, and the next nursing action.
Nurses must meticulously monitor IV sites for early signs of extravasation (pain, swelling, redness, or lack of blood return), especially when administering known vesicants or irritants.
Immediate recognition and intervention are critical nursing responsibilities. Stopping the infusion immediately can prevent severe tissue necrosis, permanent nerve damage, loss of function, or even limb loss.
Patient education is key. Instruct patients to immediately report any pain, burning, or swelling at their IV site.

How to Approach the Question

First, identify the key clinical event in the stem: a potential IV extravasation, indicated by redness, swelling, and pain.
Next, understand the question's core task: to identify which of the four medications is most likely to cause severe tissue damage and necrosis.
Recall or deduce the properties of each medication regarding its potential to harm tissue. Mentally categorize them as vesicant, irritant, or non-vesicant.
Differentiate between the vesicants. Phenytoin is known for its extreme pH (highly alkaline), causing direct chemical burns. Epinephrine is a vesicant due to vasoconstriction.
Compare the severity and mechanism. The direct chemical destruction caused by high-pH drugs like phenytoin is notoriously severe and a classic example of vesicant injury taught in nursing, making it the most likely answer for causing severe necrosis.

Concept Tested & Keywords

Concept Tested: Vesicant medications and extravasation management
Stem keywords: intravenous (IV) line, extravasation, red, swollen, and painful, severe tissue damage, necrosis
Lead-in keywords: most likely

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Practise the full NORCET 6 Prelims -2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.