ATI & NGN NCLEX Pharmacology Practice
Questions: 20 Clinical Judgment & Med-Safety
Scenarios with Detailed Rationales
Question 1
Clinical Scenario
An 82-year-old male is admitted to the medical-surgical unit
with an acute exacerbation of chronic obstructive pulmonary
disease (COPD). The client has a history of chronic kidney
disease (CKD) Stage 3, with a current glomerular filtration rate
(GFR) of $32 \text{ mL/min/1.73 m}^2$. The admitting
healthcare provider prescribes a renally cleared antibiotic and
an oral bronchodilator. During medication reconciliation, the
nurse notes that many of the client's home medications are also
excreted primarily through the kidneys.
Question Stem
Which age-related pharmacokinetic change should the nurse
prioritize when planning care and monitoring this client for drug
toxicity?
,A. Decreased rate of drug absorption in the small intestine
B. Reduced glomerular filtration and tubular secretion
C. Increased hepatic enzyme activity and first-pass metabolism
D. Decreased proportion of total body fat relative to lean
muscle mass
Correct Answer
Correct Answer: B. Reduced glomerular filtration and tubular
secretion
Detailed Rationale
Renal excretion is the primary mechanism of drug elimination
for many medications. In older adults, physiological aging leads
to a natural decline in renal blood flow, glomerular filtration
rate (GFR), and tubular secretion. When combined with pre-
existing Stage 3 chronic kidney disease, this physiological
decline is significantly accelerated. When a drug's elimination is
impaired, its half-life is prolonged, leading to drug accumulation
in the bloodstream and an elevated risk of severe adverse drug
reactions and systemic toxicity.
While age-related changes in the gastrointestinal tract (such as
increased gastric pH and decreased blood flow) can slightly
delay the rate of drug absorption (Option A), they rarely reduce
the overall extent of absorption and do not present the
immediate life-threatening risk of toxicity that impaired
,excretion does. Older adults experience a decrease in hepatic
blood flow and enzyme activity, not an increase (Option C),
which would actually decrease first-pass metabolism of some
drugs. Finally, older adults typically experience an increase in
the proportion of body fat and a decrease in lean muscle mass
and total body water (Option D). This change alters the volume
of distribution ($V_d$), causing lipid-soluble drugs to have a
prolonged half-life and water-soluble drugs to reach higher
peak concentrations, but it is not a change in drug elimination.
Learning Objectives
After completing this question, the learner should be able to:
• Explain the impact of age-related renal decline on drug
elimination and half-life.
• Identify laboratory markers (such as GFR and creatinine
clearance) used to guide medication dosage adjustments
in older adults.
• Prioritize safety monitoring protocols for older clients
receiving renally cleared medications.
Medication Safety Focus
Monitoring
Question 2
Clinical Scenario
, A nurse is preparing to administer phenytoin, an anticonvulsant
with a narrow therapeutic index, to a 45-year-old female client
with a history of tonic-clonic seizures. The client's morning
laboratory results reveal a total serum phenytoin level of $24
\text{ mcg/mL}$ (expected therapeutic range: $10 \text{ to } 20
\text{ mcg/mL}$). The client is scheduled to receive her next
oral dose of phenytoin in 30 minutes. The client appears alert,
oriented, and denies any current seizure activity, but the nurse
notes mild nystagmus during the physical assessment.
Question Stem
Which action should the nurse take first?
A. Administer the scheduled dose as prescribed and document
the nystagmus.
B. Hold the scheduled dose and immediately notify the
prescribing healthcare provider.
C. Request a repeat blood draw to verify the serum phenytoin
level.
D. Educate the client on the importance of maintaining dietary
sodium restrictions.
Correct Answer
Correct Answer: B. Hold the scheduled dose and immediately
notify the prescribing healthcare provider.
Questions: 20 Clinical Judgment & Med-Safety
Scenarios with Detailed Rationales
Question 1
Clinical Scenario
An 82-year-old male is admitted to the medical-surgical unit
with an acute exacerbation of chronic obstructive pulmonary
disease (COPD). The client has a history of chronic kidney
disease (CKD) Stage 3, with a current glomerular filtration rate
(GFR) of $32 \text{ mL/min/1.73 m}^2$. The admitting
healthcare provider prescribes a renally cleared antibiotic and
an oral bronchodilator. During medication reconciliation, the
nurse notes that many of the client's home medications are also
excreted primarily through the kidneys.
Question Stem
Which age-related pharmacokinetic change should the nurse
prioritize when planning care and monitoring this client for drug
toxicity?
,A. Decreased rate of drug absorption in the small intestine
B. Reduced glomerular filtration and tubular secretion
C. Increased hepatic enzyme activity and first-pass metabolism
D. Decreased proportion of total body fat relative to lean
muscle mass
Correct Answer
Correct Answer: B. Reduced glomerular filtration and tubular
secretion
Detailed Rationale
Renal excretion is the primary mechanism of drug elimination
for many medications. In older adults, physiological aging leads
to a natural decline in renal blood flow, glomerular filtration
rate (GFR), and tubular secretion. When combined with pre-
existing Stage 3 chronic kidney disease, this physiological
decline is significantly accelerated. When a drug's elimination is
impaired, its half-life is prolonged, leading to drug accumulation
in the bloodstream and an elevated risk of severe adverse drug
reactions and systemic toxicity.
While age-related changes in the gastrointestinal tract (such as
increased gastric pH and decreased blood flow) can slightly
delay the rate of drug absorption (Option A), they rarely reduce
the overall extent of absorption and do not present the
immediate life-threatening risk of toxicity that impaired
,excretion does. Older adults experience a decrease in hepatic
blood flow and enzyme activity, not an increase (Option C),
which would actually decrease first-pass metabolism of some
drugs. Finally, older adults typically experience an increase in
the proportion of body fat and a decrease in lean muscle mass
and total body water (Option D). This change alters the volume
of distribution ($V_d$), causing lipid-soluble drugs to have a
prolonged half-life and water-soluble drugs to reach higher
peak concentrations, but it is not a change in drug elimination.
Learning Objectives
After completing this question, the learner should be able to:
• Explain the impact of age-related renal decline on drug
elimination and half-life.
• Identify laboratory markers (such as GFR and creatinine
clearance) used to guide medication dosage adjustments
in older adults.
• Prioritize safety monitoring protocols for older clients
receiving renally cleared medications.
Medication Safety Focus
Monitoring
Question 2
Clinical Scenario
, A nurse is preparing to administer phenytoin, an anticonvulsant
with a narrow therapeutic index, to a 45-year-old female client
with a history of tonic-clonic seizures. The client's morning
laboratory results reveal a total serum phenytoin level of $24
\text{ mcg/mL}$ (expected therapeutic range: $10 \text{ to } 20
\text{ mcg/mL}$). The client is scheduled to receive her next
oral dose of phenytoin in 30 minutes. The client appears alert,
oriented, and denies any current seizure activity, but the nurse
notes mild nystagmus during the physical assessment.
Question Stem
Which action should the nurse take first?
A. Administer the scheduled dose as prescribed and document
the nystagmus.
B. Hold the scheduled dose and immediately notify the
prescribing healthcare provider.
C. Request a repeat blood draw to verify the serum phenytoin
level.
D. Educate the client on the importance of maintaining dietary
sodium restrictions.
Correct Answer
Correct Answer: B. Hold the scheduled dose and immediately
notify the prescribing healthcare provider.
