BIOL 351 | BIOL351 Module 8: Pharmacology
Updated and Latest Questions and Correct
Answers with Rationale - Portage Learning
1. A 55-year-old patient receiving high-dose methotrexate for osteosarcoma is prescribed
leucovorin. What is the primary therapeutic rationale for administering leucovorin in this
clinical scenario?
A. To enhance the cytotoxic effect of methotrexate on malignant cells.
B. To provide a source of reduced folate to healthy cells to bypass the metabolic block.
C. To prevent the formation of uric acid crystals in the renal tubules.
D. To acidify the urine to increase the solubility of the chemotherapy agent.
Correct Answer: B
Explanation: Leucovorin rescue is essential when high doses of methotrexate are used
because it provides a source of folic acid that does not require dihydrofolate reductase.
This allows normal cells to continue DNA synthesis despite the presence of the
antimetabolite drug. It does not enhance the drug’s toxicity against cancer cells but
specifically protects healthy host tissues. Proper timing of leucovorin is critical to ensure
that systemic toxicity is minimized without compromising the antineoplastic effect. Failing
to administer leucovorin can result in fatal bone marrow suppression and mucosal
ulceration.
2. A patient with breast cancer is scheduled to receive Doxorubicin. Which baseline diagnostic
test is most critical to perform before starting this specific anthracycline therapy?
A. Pulmonary function tests with DLCO.
B. Creatinine clearance and 24-hour urine protein.
C. Audiometry testing.
D. Echocardiogram or MUGA scan.
Correct Answer: D
Explanation: Doxorubicin is well-known for its potential to cause dose-dependent,
irreversible cardiotoxicity and congestive heart failure. An echocardiogram or MUGA scan
is required to determine the baseline left ventricular ejection fraction (LVEF). Monitoring
cardiac function is necessary because the risk of heart failure increases significantly once
cumulative lifetime doses are exceeded. Pulmonary tests are more relevant for bleomycin,
while audiometry is associated with cisplatin toxicity. Regular assessment during therapy
ensures that treatment is discontinued if cardiac function begins to decline.
,3. Which adverse effect is specifically associated with the administration of
Cyclophosphamide, and what intervention is used to prevent it?
A. Pulmonary fibrosis; treated with systemic corticosteroids.
B. Hemorrhagic cystitis; prevented by aggressive hydration and Mesna.
C. Peripheral neuropathy; prevented by Vitamin B6 supplementation.
D. Red-colored urine; treated by decreasing the infusion rate.
Correct Answer: B
Explanation: Cyclophosphamide produces a metabolite called acrolein, which is highly
irritating to the bladder lining and can cause severe bleeding. Hemorrhagic cystitis is the
hallmark toxicity of this alkylating agent and requires proactive management. Mesna is a
protective agent that binds to acrolein in the bladder to neutralize its toxic effects. Patients
are also encouraged to maintain high fluid intake and void frequently to minimize the
contact time of the metabolite with the bladder wall. Without these precautions, the patient
may suffer from chronic bladder scarring or life-threatening hematuria.
4. A transplant recipient is taking Cyclosporine to prevent organ rejection. The nurse notes
the patient’s latest lab results show elevated BUN and Creatinine levels. Which statement
best explains this finding?
A. This is a sign of acute rejection and requires an increased dose.
B. The patient has developed a secondary bacterial infection.
C. The patient is likely experiencing dose-related nephrotoxicity.
D. The drug is causing hepatotoxicity which affects urea production.
Correct Answer: C
Explanation: Cyclosporine is a potent immunosuppressant that frequently causes
nephrotoxicity as a major side effect. This toxicity is often dose-related and manifests as
decreased renal blood flow and glomerular filtration rate. Monitoring serum creatinine and
blood urea nitrogen (BUN) is vital for managing patients on calcineurin inhibitors. If renal
function declines, the clinician must distinguish between drug toxicity and organ rejection
through biopsy or drug level monitoring. Maintaining therapeutic levels while avoiding
toxic peaks is the primary goal of long-term cyclosporine therapy.
5. Vincristine is a mitotic inhibitor used in many chemotherapy regimens. For which specific
side effect must the nurse closely monitor the patient?
A. Peripheral neuropathy and constipation.
B. Cardiomyopathy and rhythm disturbances.
C. Severe bone marrow suppression and neutropenia.
D. Acute renal failure and crystalluria.
, Correct Answer: A
Explanation: Unlike many other chemotherapy drugs, vincristine is relatively bone
marrow-sparing but is highly neurotoxic. The most common manifestations of this toxicity
include numbness and tingling in the extremities, known as peripheral neuropathy. It also
affects the autonomic nervous system, frequently leading to severe constipation or
paralytic ileus. Nurses must assess for loss of deep tendon reflexes and changes in bowel
habits during every cycle of treatment. Because the damage can become permanent, dose
adjustments or discontinuation are often required if symptoms worsen.
6. A patient is receiving Tamoxifen for the treatment of hormone receptor-positive breast
cancer. Which assessment finding should be reported to the provider immediately?
A. Occasional hot flashes and night sweats.
B. Abnormal vaginal bleeding or discharge.
C. Mild nausea after taking the medication.
D. Gradual thinning of the hair.
Correct Answer: B
Explanation: Tamoxifen acts as an estrogen antagonist in the breast but as an estrogen
agonist in the uterus. This agonist effect increases the risk of endometrial hyperplasia and
endometrial cancer in postmenopausal women. Any report of unusual vaginal bleeding
must be investigated promptly with an endometrial biopsy. While hot flashes are the most
common side effect, they are generally not life-threatening. Education for patients taking
tamoxifen must emphasize the monitoring of gynecological changes and the increased risk
of thromboembolism.
7. Cisplatin is an alkylating-like agent used for various solid tumors. What is the most
important intervention to protect the patient’s kidneys during administration?
A. Administering the drug only via a central venous catheter.
B. Limiting protein intake during the treatment cycle.
C. Ensuring the patient takes an aspirin daily.
D. Providing intensive intravenous hydration before and after the dose.
Correct Answer: D
Explanation: Cisplatin is highly nephrotoxic and can cause permanent damage to the renal
tubules if not managed properly. Aggressive intravenous hydration, often supplemented
with mannitol or magnesium, is the standard practice to maintain high urine output. This
dilutes the concentration of the platinum compound in the kidneys and facilitates its
excretion. Healthcare providers must monitor serum creatinine and electrolytes, especially
magnesium and potassium, which are frequently depleted. If the creatinine level rises
significantly, the dose may need to be held or reduced to prevent chronic kidney disease.
Updated and Latest Questions and Correct
Answers with Rationale - Portage Learning
1. A 55-year-old patient receiving high-dose methotrexate for osteosarcoma is prescribed
leucovorin. What is the primary therapeutic rationale for administering leucovorin in this
clinical scenario?
A. To enhance the cytotoxic effect of methotrexate on malignant cells.
B. To provide a source of reduced folate to healthy cells to bypass the metabolic block.
C. To prevent the formation of uric acid crystals in the renal tubules.
D. To acidify the urine to increase the solubility of the chemotherapy agent.
Correct Answer: B
Explanation: Leucovorin rescue is essential when high doses of methotrexate are used
because it provides a source of folic acid that does not require dihydrofolate reductase.
This allows normal cells to continue DNA synthesis despite the presence of the
antimetabolite drug. It does not enhance the drug’s toxicity against cancer cells but
specifically protects healthy host tissues. Proper timing of leucovorin is critical to ensure
that systemic toxicity is minimized without compromising the antineoplastic effect. Failing
to administer leucovorin can result in fatal bone marrow suppression and mucosal
ulceration.
2. A patient with breast cancer is scheduled to receive Doxorubicin. Which baseline diagnostic
test is most critical to perform before starting this specific anthracycline therapy?
A. Pulmonary function tests with DLCO.
B. Creatinine clearance and 24-hour urine protein.
C. Audiometry testing.
D. Echocardiogram or MUGA scan.
Correct Answer: D
Explanation: Doxorubicin is well-known for its potential to cause dose-dependent,
irreversible cardiotoxicity and congestive heart failure. An echocardiogram or MUGA scan
is required to determine the baseline left ventricular ejection fraction (LVEF). Monitoring
cardiac function is necessary because the risk of heart failure increases significantly once
cumulative lifetime doses are exceeded. Pulmonary tests are more relevant for bleomycin,
while audiometry is associated with cisplatin toxicity. Regular assessment during therapy
ensures that treatment is discontinued if cardiac function begins to decline.
,3. Which adverse effect is specifically associated with the administration of
Cyclophosphamide, and what intervention is used to prevent it?
A. Pulmonary fibrosis; treated with systemic corticosteroids.
B. Hemorrhagic cystitis; prevented by aggressive hydration and Mesna.
C. Peripheral neuropathy; prevented by Vitamin B6 supplementation.
D. Red-colored urine; treated by decreasing the infusion rate.
Correct Answer: B
Explanation: Cyclophosphamide produces a metabolite called acrolein, which is highly
irritating to the bladder lining and can cause severe bleeding. Hemorrhagic cystitis is the
hallmark toxicity of this alkylating agent and requires proactive management. Mesna is a
protective agent that binds to acrolein in the bladder to neutralize its toxic effects. Patients
are also encouraged to maintain high fluid intake and void frequently to minimize the
contact time of the metabolite with the bladder wall. Without these precautions, the patient
may suffer from chronic bladder scarring or life-threatening hematuria.
4. A transplant recipient is taking Cyclosporine to prevent organ rejection. The nurse notes
the patient’s latest lab results show elevated BUN and Creatinine levels. Which statement
best explains this finding?
A. This is a sign of acute rejection and requires an increased dose.
B. The patient has developed a secondary bacterial infection.
C. The patient is likely experiencing dose-related nephrotoxicity.
D. The drug is causing hepatotoxicity which affects urea production.
Correct Answer: C
Explanation: Cyclosporine is a potent immunosuppressant that frequently causes
nephrotoxicity as a major side effect. This toxicity is often dose-related and manifests as
decreased renal blood flow and glomerular filtration rate. Monitoring serum creatinine and
blood urea nitrogen (BUN) is vital for managing patients on calcineurin inhibitors. If renal
function declines, the clinician must distinguish between drug toxicity and organ rejection
through biopsy or drug level monitoring. Maintaining therapeutic levels while avoiding
toxic peaks is the primary goal of long-term cyclosporine therapy.
5. Vincristine is a mitotic inhibitor used in many chemotherapy regimens. For which specific
side effect must the nurse closely monitor the patient?
A. Peripheral neuropathy and constipation.
B. Cardiomyopathy and rhythm disturbances.
C. Severe bone marrow suppression and neutropenia.
D. Acute renal failure and crystalluria.
, Correct Answer: A
Explanation: Unlike many other chemotherapy drugs, vincristine is relatively bone
marrow-sparing but is highly neurotoxic. The most common manifestations of this toxicity
include numbness and tingling in the extremities, known as peripheral neuropathy. It also
affects the autonomic nervous system, frequently leading to severe constipation or
paralytic ileus. Nurses must assess for loss of deep tendon reflexes and changes in bowel
habits during every cycle of treatment. Because the damage can become permanent, dose
adjustments or discontinuation are often required if symptoms worsen.
6. A patient is receiving Tamoxifen for the treatment of hormone receptor-positive breast
cancer. Which assessment finding should be reported to the provider immediately?
A. Occasional hot flashes and night sweats.
B. Abnormal vaginal bleeding or discharge.
C. Mild nausea after taking the medication.
D. Gradual thinning of the hair.
Correct Answer: B
Explanation: Tamoxifen acts as an estrogen antagonist in the breast but as an estrogen
agonist in the uterus. This agonist effect increases the risk of endometrial hyperplasia and
endometrial cancer in postmenopausal women. Any report of unusual vaginal bleeding
must be investigated promptly with an endometrial biopsy. While hot flashes are the most
common side effect, they are generally not life-threatening. Education for patients taking
tamoxifen must emphasize the monitoring of gynecological changes and the increased risk
of thromboembolism.
7. Cisplatin is an alkylating-like agent used for various solid tumors. What is the most
important intervention to protect the patient’s kidneys during administration?
A. Administering the drug only via a central venous catheter.
B. Limiting protein intake during the treatment cycle.
C. Ensuring the patient takes an aspirin daily.
D. Providing intensive intravenous hydration before and after the dose.
Correct Answer: D
Explanation: Cisplatin is highly nephrotoxic and can cause permanent damage to the renal
tubules if not managed properly. Aggressive intravenous hydration, often supplemented
with mannitol or magnesium, is the standard practice to maintain high urine output. This
dilutes the concentration of the platinum compound in the kidneys and facilitates its
excretion. Healthcare providers must monitor serum creatinine and electrolytes, especially
magnesium and potassium, which are frequently depleted. If the creatinine level rises
significantly, the dose may need to be held or reduced to prevent chronic kidney disease.
