The nurse is caring for a patient with a puncture wound.
How much time must have passed since the patient’s last tetanus toxoid vaccination for the patient to require an additional injection before being discharged from the emergency department?

Rationale for Choice A:

Incorrect. While the patient is experiencing an allergic reaction, it is not moderate. The presence of difficulty breathing and a drop in blood pressure are signs of a severe, life-threatening anaphylactic reaction.

Anaphylaxis is a severe, rapid-onset allergic reaction that can lead to death if not treated promptly. It typically involves multiple body systems, including the skin, respiratory system, cardiovascular system, and gastrointestinal system.

Moderate allergic reactions typically present with localized symptoms such as hives, itching, and redness. They do not typically involve respiratory or cardiovascular compromise.

Rationale for Choice B:

Incorrect. The patient's symptoms are not consistent with food poisoning. Food poisoning typically causes gastrointestinal symptoms such as nausea, vomiting, diarrhea, and abdominal cramps. It does not typically cause hives, difficulty breathing, or a drop in blood pressure.

The timing of the symptoms, occurring 2 hours after receiving an antibiotic, strongly suggests an allergic reaction to the medication.

Rationale for Choice C:

Correct. The patient's symptoms are consistent with anaphylaxis, a severe allergic reaction that requires immediate emergency treatment.

Key features of anaphylaxis include:

Skin involvement (hives, itching, flushing, swelling)

Respiratory distress (difficulty breathing, wheezing, tightness in the chest) Cardiovascular compromise (drop in blood pressure, lightheadedness, fainting) Gastrointestinal symptoms (nausea, vomiting, diarrhea)

Swelling of the tongue or throat

Rationale for Choice D:

Incorrect. The patient's reaction is not mild and cannot be treated with an antihistamine alone. Antihistamines are effective for mild allergic reactions, but they are not sufficient to treat anaphylaxis.

Anaphylaxis requires immediate treatment with epinephrine, which is a life-saving medication that can reverse the effects of the allergic reaction.

Choice A rationale:

Incorrect dosage form: Metformin is typically administered orally as a tablet or liquid suspension, not as a powder for reconstitution (PO).

Missing route of administration: The medication order does not specify the route of administration, such as oral (PO), intravenous (IV), or intramuscular (IM).

Potential for medication errors: The lack of clarity in the medication order could lead to errors in administration, such as giving the wrong dose or administering the medication by the wrong route.

Choice B rationale:

Incorrect dosage unit: Methotrexate is typically administered in milligrams (mg), not grams (g).

Potential for overdose: The order for 15.0 g of methotrexate is a very high dose that could lead to serious adverse effects, including toxicity and death.

Choice C rationale:

Correctly written: The medication order specifies the drug name (meropenem), the dose (1.0 g), the dosage form (IV), and the route of administration (IV).

Appropriate dosage range: The dose of 1.0 g of meropenem is within the typical dosage range for this antibiotic.

Clear and concise: The medication order is clear, concise, and easy to understand, which helps to reduce the risk of medication errors.

Choice D rationale:

Incorrect: While choices A and B are both incorrect, choice C is a correctly written medication order.