NCLEX-RN Pharmacology Immune System
MCQs: 20 High-Yield Questions with
Rationales & Clinical Judgment Scenarios |
ATI-Style Nursing Exam Prep
Question 1
Clinical Scenario
A 68-year-old male patient with a history of hypertension, type
2 diabetes, and chronic kidney disease (stage 3) is admitted to
the medical-surgical unit with cellulitis of the right lower
extremity. The provider orders intravenous vancomycin 1 gram
every 12 hours. The nurse reviews the electronic health record
and notes the patient's baseline serum creatinine is 1.8 mg/dL
(normal: 0.6-1.2 mg/dL) with an estimated glomerular filtration
rate (eGFR) of 38 mL/min/1.73m². The patient's weight is 85 kg.
Question Stem
Which action should the nurse take first?
,Options
A. Administer the vancomycin as ordered and monitor serum
creatinine levels daily
B. Request an order for vancomycin trough levels to be drawn
before the third dose
C. Contact the provider to discuss dosing adjustment based on
renal function
D. Infuse the vancomycin over 30 minutes to minimize
nephrotoxicity risk
Correct Answer
C. Contact the provider to discuss dosing adjustment based on
renal function
Detailed Rationale
Why C is correct: Vancomycin is primarily eliminated renally,
and patients with impaired renal function (eGFR < 60
mL/min/1.73m²) require dose adjustment to prevent
accumulation and toxicity. The patient's eGFR of 38 mL/min
indicates moderate to severe renal impairment, making
standard dosing potentially dangerous. The nurse's priority is to
ensure medication safety by contacting the provider to request
an adjusted dose, extended dosing interval, or therapeutic drug
,monitoring protocol. This action prevents potential vancomycin-
induced nephrotoxicity, which can further compromise the
patient's already impaired renal function.
Why A is incorrect: Simply administering the ordered dose
without addressing renal impairment is unsafe and violates the
principle of individualized dosing. While monitoring creatinine
is important, it is not sufficient to prevent toxicity from an
inappropriately high dose.
Why B is incorrect: While vancomycin trough levels are
important for monitoring therapy, they should be drawn just
before the fourth dose (steady state) in patients with normal
renal function, but in renal impairment, toxicity could occur
before reaching steady state. Dosing adjustment should
precede monitoring.
Why D is incorrect: Vancomycin should be infused over at least
60 minutes to reduce the risk of red man syndrome (histamine
release). Infusing over 30 minutes increases this risk and does
not address the primary safety concern of renal impairment.
Clinical Reasoning: The nurse must apply pharmacokinetic
principles—specifically, renal elimination—to medication safety.
In renal impairment, drug accumulation occurs, increasing the
risk of adverse effects. The priority is to prevent harm through
proactive dose adjustment rather than reactive monitoring of
toxicity.
, Learning Objective
After completing this question, the learner should be able to:
• Identify risk factors for vancomycin nephrotoxicity in
patients with renal impairment.
• Apply pharmacokinetic principles to determine
appropriate nursing actions for renally eliminated
medications.
• Prioritize medication safety interventions when
administering high-alert medications to vulnerable
populations.
• Recognize the importance of therapeutic drug monitoring
in patients receiving vancomycin.
Medication Safety Focus
High-alert medication | Renal impairment
dosing | Nephrotoxicity prevention
Question 2
Clinical Scenario
MCQs: 20 High-Yield Questions with
Rationales & Clinical Judgment Scenarios |
ATI-Style Nursing Exam Prep
Question 1
Clinical Scenario
A 68-year-old male patient with a history of hypertension, type
2 diabetes, and chronic kidney disease (stage 3) is admitted to
the medical-surgical unit with cellulitis of the right lower
extremity. The provider orders intravenous vancomycin 1 gram
every 12 hours. The nurse reviews the electronic health record
and notes the patient's baseline serum creatinine is 1.8 mg/dL
(normal: 0.6-1.2 mg/dL) with an estimated glomerular filtration
rate (eGFR) of 38 mL/min/1.73m². The patient's weight is 85 kg.
Question Stem
Which action should the nurse take first?
,Options
A. Administer the vancomycin as ordered and monitor serum
creatinine levels daily
B. Request an order for vancomycin trough levels to be drawn
before the third dose
C. Contact the provider to discuss dosing adjustment based on
renal function
D. Infuse the vancomycin over 30 minutes to minimize
nephrotoxicity risk
Correct Answer
C. Contact the provider to discuss dosing adjustment based on
renal function
Detailed Rationale
Why C is correct: Vancomycin is primarily eliminated renally,
and patients with impaired renal function (eGFR < 60
mL/min/1.73m²) require dose adjustment to prevent
accumulation and toxicity. The patient's eGFR of 38 mL/min
indicates moderate to severe renal impairment, making
standard dosing potentially dangerous. The nurse's priority is to
ensure medication safety by contacting the provider to request
an adjusted dose, extended dosing interval, or therapeutic drug
,monitoring protocol. This action prevents potential vancomycin-
induced nephrotoxicity, which can further compromise the
patient's already impaired renal function.
Why A is incorrect: Simply administering the ordered dose
without addressing renal impairment is unsafe and violates the
principle of individualized dosing. While monitoring creatinine
is important, it is not sufficient to prevent toxicity from an
inappropriately high dose.
Why B is incorrect: While vancomycin trough levels are
important for monitoring therapy, they should be drawn just
before the fourth dose (steady state) in patients with normal
renal function, but in renal impairment, toxicity could occur
before reaching steady state. Dosing adjustment should
precede monitoring.
Why D is incorrect: Vancomycin should be infused over at least
60 minutes to reduce the risk of red man syndrome (histamine
release). Infusing over 30 minutes increases this risk and does
not address the primary safety concern of renal impairment.
Clinical Reasoning: The nurse must apply pharmacokinetic
principles—specifically, renal elimination—to medication safety.
In renal impairment, drug accumulation occurs, increasing the
risk of adverse effects. The priority is to prevent harm through
proactive dose adjustment rather than reactive monitoring of
toxicity.
, Learning Objective
After completing this question, the learner should be able to:
• Identify risk factors for vancomycin nephrotoxicity in
patients with renal impairment.
• Apply pharmacokinetic principles to determine
appropriate nursing actions for renally eliminated
medications.
• Prioritize medication safety interventions when
administering high-alert medications to vulnerable
populations.
• Recognize the importance of therapeutic drug monitoring
in patients receiving vancomycin.
Medication Safety Focus
High-alert medication | Renal impairment
dosing | Nephrotoxicity prevention
Question 2
Clinical Scenario
