NCLEX-RN Gastrointestinal Pharmacology
Exam |
20 Original ATI & NGN-Style Practice
Questions with Detailed Rationales
Question 1
Clinical Scenario
A 68-year-old female with a history of gastroesophageal reflux
disease (GERD) has been taking omeprazole 40 mg daily for the past
3 years. She presents to the clinic complaining of new-onset muscle
cramps, palpitations, and generalized fatigue. Her vital signs are
stable, and her physical assessment is otherwise unremarkable.
Question Stem
Which laboratory finding should the nurse anticipate reviewing to
determine the cause of these symptoms?
Options
A. Serum potassium
B. Serum magnesium
C. Serum calcium
D. Serum sodium
Correct Answer
Correct Answer: B. Serum magnesium
,Detailed Rationale
Long-term use of proton pump inhibitors (PPIs) like omeprazole is
associated with an increased risk of hypomagnesemia, particularly
after 3 months to 1 year of continuous therapy. Hypomagnesemia
can manifest clinically as muscle cramps, palpitations, fatigue,
tremors, and in severe cases, seizures or cardiac arrhythmias. The
nurse should anticipate reviewing serum magnesium levels and
monitor for these specific signs. While PPIs can also affect vitamin
B12 absorption and increase the risk of Clostridioides difficile
infection and bone fractures, serum potassium (Option A), calcium
(Option C), and sodium (Option D) are not the primary electrolyte
abnormalities directly linked to chronic PPI therapy as a prominent
FDA warning. Nursing considerations include advising patients to
report unexplained muscle spasms or irregular heartbeats and
ensuring periodic monitoring of magnesium levels for those on
prolonged therapy.
Learning Objective
After completing this question, the learner should be able to:
• Identify hypomagnesemia as a potential adverse effect of long-
term PPI therapy.
• Recognize the clinical manifestations of low serum magnesium.
• Prioritize appropriate laboratory monitoring for clients on chronic
omeprazole.
Medication Safety Focus
Adverse effect monitoring
Question 2
,Clinical Scenario
A 55-year-old male receiving highly emetogenic chemotherapy is
prescribed IV ondansetron for nausea prevention. His medical
history includes heart failure and a documented prolonged QT
interval on a previous electrocardiogram.
Question Stem
Which action should the nurse take prior to administering this
medication?
Options
A. Administer a prophylactic dose of diphenhydramine
B. Ensure the client has eaten a full meal
C. Review the client's most recent electrocardiogram (ECG)
D. Check the client's blood urea nitrogen (BUN) level
Correct Answer
Correct Answer: C. Review the client's most recent
electrocardiogram (ECG)
Detailed Rationale
Ondansetron is a highly effective serotonin (5-HT3) receptor
antagonist used to prevent chemotherapy-induced nausea and
vomiting. However, it carries a known risk of dose-dependent QT
interval prolongation, which can lead to life-threatening arrhythmias
such as torsades de pointes. For a client with a history of heart
failure and a known prolonged QT interval, the nurse must prioritize
reviewing the most recent ECG to assess the current QTc interval
before administration. Administering a prophylactic dose of
diphenhydramine (Option A) is not indicated for ondansetron and
does not prevent QT prolongation. Ensuring the client has eaten a
, full meal (Option B) is unnecessary and may exacerbate nausea.
Checking the BUN (Option D) is not the priority, as ondansetron is
primarily metabolized by the liver, and cardiac status is the
immediate safety concern in this specific clinical context.
Learning Objective
After completing this question, the learner should be able to:
• Recognize QT prolongation as a significant adverse effect of
ondansetron.
• Prioritize cardiac assessment and ECG review for at-risk clients.
• Apply clinical judgment to prevent medication-induced
arrhythmias.
Medication Safety Focus
Contraindication / Adverse effect recognition
Question 3
Clinical Scenario
A 62-year-old male with liver cirrhosis is admitted with confusion
and asterixis, consistent with hepatic encephalopathy. The provider
prescribes lactulose 30 mL PO every 6 hours.
Question Stem
Which finding indicates the medication is having the desired
therapeutic effect?
Options
A. The client's serum ammonia level increases to 150 mcg/dL
B. The client exhibits a decrease in abdominal girth
Exam |
20 Original ATI & NGN-Style Practice
Questions with Detailed Rationales
Question 1
Clinical Scenario
A 68-year-old female with a history of gastroesophageal reflux
disease (GERD) has been taking omeprazole 40 mg daily for the past
3 years. She presents to the clinic complaining of new-onset muscle
cramps, palpitations, and generalized fatigue. Her vital signs are
stable, and her physical assessment is otherwise unremarkable.
Question Stem
Which laboratory finding should the nurse anticipate reviewing to
determine the cause of these symptoms?
Options
A. Serum potassium
B. Serum magnesium
C. Serum calcium
D. Serum sodium
Correct Answer
Correct Answer: B. Serum magnesium
,Detailed Rationale
Long-term use of proton pump inhibitors (PPIs) like omeprazole is
associated with an increased risk of hypomagnesemia, particularly
after 3 months to 1 year of continuous therapy. Hypomagnesemia
can manifest clinically as muscle cramps, palpitations, fatigue,
tremors, and in severe cases, seizures or cardiac arrhythmias. The
nurse should anticipate reviewing serum magnesium levels and
monitor for these specific signs. While PPIs can also affect vitamin
B12 absorption and increase the risk of Clostridioides difficile
infection and bone fractures, serum potassium (Option A), calcium
(Option C), and sodium (Option D) are not the primary electrolyte
abnormalities directly linked to chronic PPI therapy as a prominent
FDA warning. Nursing considerations include advising patients to
report unexplained muscle spasms or irregular heartbeats and
ensuring periodic monitoring of magnesium levels for those on
prolonged therapy.
Learning Objective
After completing this question, the learner should be able to:
• Identify hypomagnesemia as a potential adverse effect of long-
term PPI therapy.
• Recognize the clinical manifestations of low serum magnesium.
• Prioritize appropriate laboratory monitoring for clients on chronic
omeprazole.
Medication Safety Focus
Adverse effect monitoring
Question 2
,Clinical Scenario
A 55-year-old male receiving highly emetogenic chemotherapy is
prescribed IV ondansetron for nausea prevention. His medical
history includes heart failure and a documented prolonged QT
interval on a previous electrocardiogram.
Question Stem
Which action should the nurse take prior to administering this
medication?
Options
A. Administer a prophylactic dose of diphenhydramine
B. Ensure the client has eaten a full meal
C. Review the client's most recent electrocardiogram (ECG)
D. Check the client's blood urea nitrogen (BUN) level
Correct Answer
Correct Answer: C. Review the client's most recent
electrocardiogram (ECG)
Detailed Rationale
Ondansetron is a highly effective serotonin (5-HT3) receptor
antagonist used to prevent chemotherapy-induced nausea and
vomiting. However, it carries a known risk of dose-dependent QT
interval prolongation, which can lead to life-threatening arrhythmias
such as torsades de pointes. For a client with a history of heart
failure and a known prolonged QT interval, the nurse must prioritize
reviewing the most recent ECG to assess the current QTc interval
before administration. Administering a prophylactic dose of
diphenhydramine (Option A) is not indicated for ondansetron and
does not prevent QT prolongation. Ensuring the client has eaten a
, full meal (Option B) is unnecessary and may exacerbate nausea.
Checking the BUN (Option D) is not the priority, as ondansetron is
primarily metabolized by the liver, and cardiac status is the
immediate safety concern in this specific clinical context.
Learning Objective
After completing this question, the learner should be able to:
• Recognize QT prolongation as a significant adverse effect of
ondansetron.
• Prioritize cardiac assessment and ECG review for at-risk clients.
• Apply clinical judgment to prevent medication-induced
arrhythmias.
Medication Safety Focus
Contraindication / Adverse effect recognition
Question 3
Clinical Scenario
A 62-year-old male with liver cirrhosis is admitted with confusion
and asterixis, consistent with hepatic encephalopathy. The provider
prescribes lactulose 30 mL PO every 6 hours.
Question Stem
Which finding indicates the medication is having the desired
therapeutic effect?
Options
A. The client's serum ammonia level increases to 150 mcg/dL
B. The client exhibits a decrease in abdominal girth
