NCLEX-RN Pharmacology Gastrointestinal
System Practice Questions |
20 NGN-Style MCQs with Rationales |
ATI Pharmacology Made Easy Nursing
Exam Prep
Question 1
Clinical Scenario
A 55-year-old client is newly diagnosed with gastroesophageal reflux
disease (GERD) and is prescribed omeprazole 20 mg daily. The client
has no other significant medical history and is being discharged with
the new prescription.
Question Stem
Which statement by the client indicates an understanding of the
proper administration of this medication?
Options
A. "I will take this medication right before going to bed at night."
B. "I should take this medication 30 to 60 minutes before my first
meal of the day."
C. "I can crush this capsule and mix it with applesauce if I have
trouble swallowing."
,D. "I will take this medication immediately after eating a large meal
to prevent heartburn."
Correct Answer
Correct Answer: B. "I should take this medication 30 to 60 minutes
before my first meal of the day."
Detailed Rationale
Omeprazole is a proton pump inhibitor (PPI) that irreversibly blocks
the hydrogen/potassium adenosine triphosphatase enzyme system
(the "proton pump") of the gastric parietal cells. For optimal efficacy,
PPIs should be administered 30 to 60 minutes before the first meal
of the day (typically breakfast). This timing ensures that the
medication is absorbed and reaches peak plasma levels just as the
proton pumps are activated by food intake, maximizing acid
suppression. Option A is incorrect because taking it at bedtime
without a subsequent meal reduces its effectiveness. Option C is
incorrect because enteric-coated omeprazole capsules should not
be crushed or chewed, as this destroys the protective coating,
leading to premature degradation of the drug by stomach acid
(though some specific formulations allow opening and sprinkling on
acidic soft foods, crushing is universally contraindicated). Option D
is incorrect because taking it after a meal delays absorption and
misses the window of maximal proton pump activation.
Learning Objective
• Identify the optimal timing for administering proton pump
inhibitors to maximize therapeutic effect.
• Educate patients on the proper administration and handling of
enteric-coated gastrointestinal medications.
, • Explain the mechanism of action of proton pump inhibitors in
the treatment of GERD.
Medication Safety Focus
Medication administration
Question 2
Clinical Scenario
A 68-year-old client is experiencing severe postoperative nausea
and vomiting. The provider prescribes ondansetron 4 mg IV push.
The client’s medical history includes heart failure and a recent
electrocardiogram showing a QTc interval of 480 milliseconds.
Question Stem
Which action should the nurse take first?
Options
A. Administer the ondansetron slowly over 2 to 5 minutes.
B. Request a prescription for an alternative antiemetic medication.
C. Administer the ondansetron and monitor the client’s heart rhythm
continuously.
D. Dilute the ondansetron in 50 mL of normal saline and infuse over
15 minutes.
Correct Answer
Correct Answer: B. Request a prescription for an alternative
antiemetic medication.
Detailed Rationale
Ondansetron, a serotonin (5-HT3) receptor antagonist, carries a
, known risk of dose-dependent QT interval prolongation, which can
lead to life-threatening arrhythmias such as torsades de pointes. A
QTc interval greater than 450 milliseconds in men or 460
milliseconds in women is considered prolonged, and a QTc > 500
milliseconds significantly increases the risk of torsades de pointes.
With a baseline QTc of 480 milliseconds, administering ondansetron
poses a severe medication safety risk. The priority nursing action is
to withhold the medication and contact the provider to request a
safer alternative (e.g., promethazine or a different class of
antiemetic, depending on the full clinical picture). Options A, C, and
D are incorrect because any route or method of administering
ondansetron is contraindicated when the client already has a
significantly prolonged QTc interval. Monitoring does not prevent the
potential arrhythmia; avoiding the offending agent is the priority.
Learning Objective
• Recognize the risk of QT prolongation associated with
ondansetron administration.
• Prioritize nursing interventions when a prescribed medication
is contraindicated by baseline assessment data.
• Interpret electrocardiogram findings (QTc interval) in the
context of medication safety.
Medication Safety Focus
Contraindication
Question 3
System Practice Questions |
20 NGN-Style MCQs with Rationales |
ATI Pharmacology Made Easy Nursing
Exam Prep
Question 1
Clinical Scenario
A 55-year-old client is newly diagnosed with gastroesophageal reflux
disease (GERD) and is prescribed omeprazole 20 mg daily. The client
has no other significant medical history and is being discharged with
the new prescription.
Question Stem
Which statement by the client indicates an understanding of the
proper administration of this medication?
Options
A. "I will take this medication right before going to bed at night."
B. "I should take this medication 30 to 60 minutes before my first
meal of the day."
C. "I can crush this capsule and mix it with applesauce if I have
trouble swallowing."
,D. "I will take this medication immediately after eating a large meal
to prevent heartburn."
Correct Answer
Correct Answer: B. "I should take this medication 30 to 60 minutes
before my first meal of the day."
Detailed Rationale
Omeprazole is a proton pump inhibitor (PPI) that irreversibly blocks
the hydrogen/potassium adenosine triphosphatase enzyme system
(the "proton pump") of the gastric parietal cells. For optimal efficacy,
PPIs should be administered 30 to 60 minutes before the first meal
of the day (typically breakfast). This timing ensures that the
medication is absorbed and reaches peak plasma levels just as the
proton pumps are activated by food intake, maximizing acid
suppression. Option A is incorrect because taking it at bedtime
without a subsequent meal reduces its effectiveness. Option C is
incorrect because enteric-coated omeprazole capsules should not
be crushed or chewed, as this destroys the protective coating,
leading to premature degradation of the drug by stomach acid
(though some specific formulations allow opening and sprinkling on
acidic soft foods, crushing is universally contraindicated). Option D
is incorrect because taking it after a meal delays absorption and
misses the window of maximal proton pump activation.
Learning Objective
• Identify the optimal timing for administering proton pump
inhibitors to maximize therapeutic effect.
• Educate patients on the proper administration and handling of
enteric-coated gastrointestinal medications.
, • Explain the mechanism of action of proton pump inhibitors in
the treatment of GERD.
Medication Safety Focus
Medication administration
Question 2
Clinical Scenario
A 68-year-old client is experiencing severe postoperative nausea
and vomiting. The provider prescribes ondansetron 4 mg IV push.
The client’s medical history includes heart failure and a recent
electrocardiogram showing a QTc interval of 480 milliseconds.
Question Stem
Which action should the nurse take first?
Options
A. Administer the ondansetron slowly over 2 to 5 minutes.
B. Request a prescription for an alternative antiemetic medication.
C. Administer the ondansetron and monitor the client’s heart rhythm
continuously.
D. Dilute the ondansetron in 50 mL of normal saline and infuse over
15 minutes.
Correct Answer
Correct Answer: B. Request a prescription for an alternative
antiemetic medication.
Detailed Rationale
Ondansetron, a serotonin (5-HT3) receptor antagonist, carries a
, known risk of dose-dependent QT interval prolongation, which can
lead to life-threatening arrhythmias such as torsades de pointes. A
QTc interval greater than 450 milliseconds in men or 460
milliseconds in women is considered prolonged, and a QTc > 500
milliseconds significantly increases the risk of torsades de pointes.
With a baseline QTc of 480 milliseconds, administering ondansetron
poses a severe medication safety risk. The priority nursing action is
to withhold the medication and contact the provider to request a
safer alternative (e.g., promethazine or a different class of
antiemetic, depending on the full clinical picture). Options A, C, and
D are incorrect because any route or method of administering
ondansetron is contraindicated when the client already has a
significantly prolonged QTc interval. Monitoring does not prevent the
potential arrhythmia; avoiding the offending agent is the priority.
Learning Objective
• Recognize the risk of QT prolongation associated with
ondansetron administration.
• Prioritize nursing interventions when a prescribed medication
is contraindicated by baseline assessment data.
• Interpret electrocardiogram findings (QTc interval) in the
context of medication safety.
Medication Safety Focus
Contraindication
Question 3
