The patient with leukemia is receiving busulfan (Myleran) and allopurinol (Zyloprim). The nurse tells the patient that the purpose of the allopurinol is to prevent ?

Appeared in: Chitranjjan National Cancer Institute Kolkata - 2021

Explanation

Chemotherapy drugs like busulfan cause rapid breakdown (lysis) of cancer cells.
This cell lysis releases large amounts of purines, which are metabolized into uric acid, leading to a risk of hyperuricemia (high uric acid levels).
Allopurinol is a xanthine oxidase inhibitor; it blocks the enzyme responsible for converting purines into uric acid.
By blocking this enzyme, allopurinol prevents the development of hyperuricemia and its complications, such as kidney damage from uric acid crystals.
This prophylactic use of allopurinol is a key strategy in preventing Tumor Lysis Syndrome (TLS).

Option A: Alopecia (hair loss) is a direct side effect of many chemotherapy agents, including busulfan, due to their effect on rapidly dividing hair follicle cells. Allopurinol does not affect this process.
Option C: Vomiting is a common side effect of chemotherapy, managed with antiemetic drugs (like ondansetron or metoclopramide), which target the chemoreceptor trigger zone in the brain. Allopurinol has no antiemetic properties.
Option D: Nausea, like vomiting, is a chemotherapy-induced side effect treated with antiemetics. Allopurinol's mechanism is unrelated to the pathways that cause nausea.

Clinical Relevance

Nursing practice connection: Use the key finding related to Pharmacological management of chemotherapy side effects to guide bedside assessment, documentation, and the next nursing action.
Tumor Lysis Syndrome (TLS) is a life-threatening oncologic emergency. Nurses play a vital role in identifying at-risk patients (those with high tumor burden like leukemia) and implementing preventive measures.
Nursing responsibilities include administering allopurinol as prescribed, ensuring aggressive hydration (e.g., 2-3 L/day), strictly monitoring intake and output, and assessing for signs of electrolyte imbalances (e.g., muscle cramps, weakness, dysrhythmias).
A critical nursing assessment is to monitor for a rash when a patient is on allopurinol, as it can be an early sign of a severe hypersensitivity reaction like Stevens-Johnson syndrome. If a rash develops, the drug should be stopped and the provider notified immediately.

How to Approach the Question

First, identify the drugs mentioned: busulfan (a chemotherapy agent) and allopurinol.
Recognize that the question asks for the purpose of allopurinol when given with chemotherapy for leukemia.
Recall the major, acute complications of chemotherapy for a high-burden cancer like leukemia. This should bring to mind Tumor Lysis Syndrome (TLS).
Consider the pathophysiology of TLS: rapid cell death leads to the release of intracellular contents, including purines, which are converted to uric acid.
Recall the mechanism of action of allopurinol. It is a xanthine oxidase inhibitor, a key enzyme in the uric acid production pathway.
Connect the drug's action to the pathophysiology. By inhibiting uric acid production, allopurinol prevents hyperuricemia, the central problem in TLS. Evaluate the options based on this connection.

Concept Tested & Keywords

Concept Tested: Pharmacological management of chemotherapy side effects
Stem keywords: leukemia, busulfan, Myleran, allopurinol, Zyloprim
Lead-in keywords: purpose, prevent
Clinical cues: Patient with leukemia receiving chemotherapy, indicating a high risk for tumor cell lysis.

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