NURS 6521A Final Exam Prep Question Bank
Latest 2026/2027 Edition
100 Original Practice Questions & Detailed Rationales
Comprehensive Independent Exam Preparation Resource
,Question 1
A 58-year-old man with a spinal cord injury above T6 develops a pounding headache, flushing above the injury
level, and blood pressure of 210/120 mmHg after a blocked urinary catheter. Which pharmacologic approach is
most appropriate for this autonomic dysreflexia episode?
A. Immediate rapid-acting antihypertensive such as nifedipine while removing the triggering stimulus
B. Scheduled beta-blocker therapy
C. IV fluid bolus to dilute circulating catecholamines
D. Oral clonidine with delayed onset
Correct Answer: A
Rationale: Autonomic dysreflexia is a hypertensive emergency triggered by unopposed sympathetic discharge
below the injury level, requiring immediate removal of the noxious stimulus alongside a rapid-onset
antihypertensive to prevent stroke. Scheduled beta-blockers, fluid boluses, and delayed-onset oral agents do not
address the acute, rapidly escalating pressure.
Question 2
Which receptor mechanism explains why phenylephrine, unlike epinephrine, produces reflex bradycardia when
given as an IV bolus for hypotension?
A. Pure alpha-1 agonism causing vasoconstriction and baroreceptor-mediated reflex slowing of heart rate
B. Direct beta-1 blockade at the SA node
C. Combined alpha and beta agonism with no reflex effect
D. Direct vagal nerve stimulation
Correct Answer: A
Rationale: Phenylephrine is a selective alpha-1 agonist that raises blood pressure through vasoconstriction
alone, and the resulting rise in pressure triggers a baroreceptor reflex that slows heart rate via vagal outflow. It
has no direct beta or vagal nerve action itself; the bradycardia is purely reflexive.
Question 3
A 71-year-old woman with heart failure with reduced ejection fraction on optimal guideline-directed therapy is
being considered for an SGLT2 inhibitor. What is the primary evidence-based rationale?
A. SGLT2 inhibitors reduce hospitalization for heart failure and cardiovascular mortality independent of
diabetes status
B. SGLT2 inhibitors are used solely for glycemic control in this population
C. SGLT2 inhibitors replace the need for diuretics
D. SGLT2 inhibitors are contraindicated in heart failure
Correct Answer: A
Rationale: Landmark trials established that SGLT2 inhibitors reduce heart failure hospitalizations and
cardiovascular death in patients with HFrEF regardless of diabetes status, leading to their inclusion in
guideline-directed medical therapy. They do not replace diuretics for volume management and are not
contraindicated in this population.
Question 4
A patient on warfarin with a therapeutic INR is started on a short course of trimethoprim-sulfamethoxazole for a
urinary tract infection. What is the most important consideration?
A. No interaction exists between these agents
, B. Sulfamethoxazole inhibits CYP2C9 and displaces warfarin from protein binding, increasing bleeding risk
C. Trimethoprim decreases warfarin absorption
D. This combination decreases INR, requiring a warfarin dose increase
Correct Answer: B
Rationale: Sulfamethoxazole inhibits the CYP2C9 enzyme responsible for warfarin metabolism and can displace
warfarin from albumin, both of which increase free warfarin activity and bleeding risk, necessitating close INR
monitoring or an alternative antibiotic. The interaction raises, not lowers, INR, and it is not due to reduced
absorption.
Question 5
Which mechanism explains why abrupt discontinuation of levothyroxine in a patient with primary
hypothyroidism can be dangerous in the setting of concurrent unrecognized adrenal insufficiency?
A. Increasing metabolic rate without adequate cortisol reserve can precipitate acute adrenal crisis
B. Levothyroxine has no relationship to adrenal function
C. Discontinuation always causes immediate hyperthyroidism
D. Levothyroxine directly suppresses cortisol production
Correct Answer: A
Rationale: In patients with coexisting adrenal insufficiency, initiating or increasing thyroid hormone accelerates
cortisol metabolism and increases metabolic demand, which can precipitate adrenal crisis if cortisol replacement
is not addressed first; this is why adrenal function should be assessed before or alongside thyroid therapy in
suspected panhypopituitarism. Discontinuation itself would cause hypothyroid symptoms, not immediate
hyperthyroidism, and levothyroxine does not directly suppress cortisol.
Question 6
A 34-year-old woman with bipolar I disorder stabilized on lithium presents for a preconception counseling visit.
Which fetal risk is most specifically associated with first-trimester lithium exposure?
A. Ebstein's anomaly, a cardiac malformation
B. Neural tube defects
C. Cleft palate as the primary concern
D. Limb reduction defects
Correct Answer: A
Rationale: First-trimester lithium exposure is specifically associated with an increased risk of Ebstein's anomaly,
a malformation of the tricuspid valve, though the absolute risk is lower than once believed. Neural tube defects
are more classically linked to valproic acid, and cleft palate and limb reduction defects are not the hallmark
lithium-associated anomaly.
Question 7
Which pharmacokinetic property of azithromycin, compared to erythromycin, allows for shorter treatment courses
and once-daily dosing?
A. A markedly prolonged tissue half-life allowing sustained intracellular concentrations
B. Complete absence of hepatic metabolism
C. Significantly higher renal clearance
D. Lower protein binding only
Correct Answer: A
, Rationale: Azithromycin accumulates in tissues and has a very long tissue half-life, allowing sustained
antibacterial concentrations after short courses such as five-day regimens, unlike erythromycin which requires
more frequent dosing. It does undergo some hepatic handling, and the defining pharmacokinetic advantage is
tissue half-life rather than renal clearance or protein binding alone.
Question 8
A patient with chronic pain on a stable oxycodone regimen is started on a CYP3A4 inducer for an unrelated
condition. What is the expected clinical consequence?
A. Increased oxycodone effect and sedation
B. Reduced oxycodone efficacy due to accelerated metabolism, potentially requiring dose adjustment
C. No change in oxycodone metabolism
D. Immediate opioid withdrawal regardless of dose
Correct Answer: B
Rationale: Oxycodone is metabolized in part through CYP3A4, and induction of this enzyme accelerates its
clearance, potentially reducing analgesic efficacy and risking breakthrough pain or withdrawal-like symptoms if
the dose is not reassessed. It would not increase sedation, and while symptoms could emerge, immediate
withdrawal is not the expected direct pharmacologic consequence of enzyme induction alone.
Question 9
Which spirometric or clinical rationale supports adding a long-acting muscarinic antagonist to a long-acting
beta-agonist in a patient with moderate COPD and persistent dyspnea?
A. Combining bronchodilators with different mechanisms provides greater bronchodilation than either agent
alone
B. LAMAs replace the need for inhaled corticosteroids in all COPD patients
C. LAMAs and LABAs share an identical mechanism, so combination offers no additional benefit
D. Combination therapy is reserved only for acute exacerbations
Correct Answer: A
Rationale: LAMAs and LABAs act through distinct mechanisms, anticholinergic and beta-2 adrenergic
respectively, and their combination produces greater bronchodilation and symptom improvement than either class
alone in patients with persistent symptoms. They do not universally replace inhaled corticosteroids, do not share
an identical mechanism, and are used for maintenance rather than solely acute exacerbation therapy.
Question 10
A patient with Crohn's disease is started on infliximab. Which screening is essential prior to initiation due to risk
of reactivation?
A. Latent tuberculosis and hepatitis B screening
B. Screening for iron deficiency only
C. Screening for hypothyroidism only
D. No screening is required before biologic therapy
Correct Answer: A
Rationale: TNF-alpha inhibitors like infliximab can reactivate latent tuberculosis and hepatitis B due to
suppression of immune surveillance, making baseline screening for both essential before initiating therapy. Iron
deficiency and thyroid screening are not the specific safety concerns associated with immunosuppressive biologic
initiation.
Latest 2026/2027 Edition
100 Original Practice Questions & Detailed Rationales
Comprehensive Independent Exam Preparation Resource
,Question 1
A 58-year-old man with a spinal cord injury above T6 develops a pounding headache, flushing above the injury
level, and blood pressure of 210/120 mmHg after a blocked urinary catheter. Which pharmacologic approach is
most appropriate for this autonomic dysreflexia episode?
A. Immediate rapid-acting antihypertensive such as nifedipine while removing the triggering stimulus
B. Scheduled beta-blocker therapy
C. IV fluid bolus to dilute circulating catecholamines
D. Oral clonidine with delayed onset
Correct Answer: A
Rationale: Autonomic dysreflexia is a hypertensive emergency triggered by unopposed sympathetic discharge
below the injury level, requiring immediate removal of the noxious stimulus alongside a rapid-onset
antihypertensive to prevent stroke. Scheduled beta-blockers, fluid boluses, and delayed-onset oral agents do not
address the acute, rapidly escalating pressure.
Question 2
Which receptor mechanism explains why phenylephrine, unlike epinephrine, produces reflex bradycardia when
given as an IV bolus for hypotension?
A. Pure alpha-1 agonism causing vasoconstriction and baroreceptor-mediated reflex slowing of heart rate
B. Direct beta-1 blockade at the SA node
C. Combined alpha and beta agonism with no reflex effect
D. Direct vagal nerve stimulation
Correct Answer: A
Rationale: Phenylephrine is a selective alpha-1 agonist that raises blood pressure through vasoconstriction
alone, and the resulting rise in pressure triggers a baroreceptor reflex that slows heart rate via vagal outflow. It
has no direct beta or vagal nerve action itself; the bradycardia is purely reflexive.
Question 3
A 71-year-old woman with heart failure with reduced ejection fraction on optimal guideline-directed therapy is
being considered for an SGLT2 inhibitor. What is the primary evidence-based rationale?
A. SGLT2 inhibitors reduce hospitalization for heart failure and cardiovascular mortality independent of
diabetes status
B. SGLT2 inhibitors are used solely for glycemic control in this population
C. SGLT2 inhibitors replace the need for diuretics
D. SGLT2 inhibitors are contraindicated in heart failure
Correct Answer: A
Rationale: Landmark trials established that SGLT2 inhibitors reduce heart failure hospitalizations and
cardiovascular death in patients with HFrEF regardless of diabetes status, leading to their inclusion in
guideline-directed medical therapy. They do not replace diuretics for volume management and are not
contraindicated in this population.
Question 4
A patient on warfarin with a therapeutic INR is started on a short course of trimethoprim-sulfamethoxazole for a
urinary tract infection. What is the most important consideration?
A. No interaction exists between these agents
, B. Sulfamethoxazole inhibits CYP2C9 and displaces warfarin from protein binding, increasing bleeding risk
C. Trimethoprim decreases warfarin absorption
D. This combination decreases INR, requiring a warfarin dose increase
Correct Answer: B
Rationale: Sulfamethoxazole inhibits the CYP2C9 enzyme responsible for warfarin metabolism and can displace
warfarin from albumin, both of which increase free warfarin activity and bleeding risk, necessitating close INR
monitoring or an alternative antibiotic. The interaction raises, not lowers, INR, and it is not due to reduced
absorption.
Question 5
Which mechanism explains why abrupt discontinuation of levothyroxine in a patient with primary
hypothyroidism can be dangerous in the setting of concurrent unrecognized adrenal insufficiency?
A. Increasing metabolic rate without adequate cortisol reserve can precipitate acute adrenal crisis
B. Levothyroxine has no relationship to adrenal function
C. Discontinuation always causes immediate hyperthyroidism
D. Levothyroxine directly suppresses cortisol production
Correct Answer: A
Rationale: In patients with coexisting adrenal insufficiency, initiating or increasing thyroid hormone accelerates
cortisol metabolism and increases metabolic demand, which can precipitate adrenal crisis if cortisol replacement
is not addressed first; this is why adrenal function should be assessed before or alongside thyroid therapy in
suspected panhypopituitarism. Discontinuation itself would cause hypothyroid symptoms, not immediate
hyperthyroidism, and levothyroxine does not directly suppress cortisol.
Question 6
A 34-year-old woman with bipolar I disorder stabilized on lithium presents for a preconception counseling visit.
Which fetal risk is most specifically associated with first-trimester lithium exposure?
A. Ebstein's anomaly, a cardiac malformation
B. Neural tube defects
C. Cleft palate as the primary concern
D. Limb reduction defects
Correct Answer: A
Rationale: First-trimester lithium exposure is specifically associated with an increased risk of Ebstein's anomaly,
a malformation of the tricuspid valve, though the absolute risk is lower than once believed. Neural tube defects
are more classically linked to valproic acid, and cleft palate and limb reduction defects are not the hallmark
lithium-associated anomaly.
Question 7
Which pharmacokinetic property of azithromycin, compared to erythromycin, allows for shorter treatment courses
and once-daily dosing?
A. A markedly prolonged tissue half-life allowing sustained intracellular concentrations
B. Complete absence of hepatic metabolism
C. Significantly higher renal clearance
D. Lower protein binding only
Correct Answer: A
, Rationale: Azithromycin accumulates in tissues and has a very long tissue half-life, allowing sustained
antibacterial concentrations after short courses such as five-day regimens, unlike erythromycin which requires
more frequent dosing. It does undergo some hepatic handling, and the defining pharmacokinetic advantage is
tissue half-life rather than renal clearance or protein binding alone.
Question 8
A patient with chronic pain on a stable oxycodone regimen is started on a CYP3A4 inducer for an unrelated
condition. What is the expected clinical consequence?
A. Increased oxycodone effect and sedation
B. Reduced oxycodone efficacy due to accelerated metabolism, potentially requiring dose adjustment
C. No change in oxycodone metabolism
D. Immediate opioid withdrawal regardless of dose
Correct Answer: B
Rationale: Oxycodone is metabolized in part through CYP3A4, and induction of this enzyme accelerates its
clearance, potentially reducing analgesic efficacy and risking breakthrough pain or withdrawal-like symptoms if
the dose is not reassessed. It would not increase sedation, and while symptoms could emerge, immediate
withdrawal is not the expected direct pharmacologic consequence of enzyme induction alone.
Question 9
Which spirometric or clinical rationale supports adding a long-acting muscarinic antagonist to a long-acting
beta-agonist in a patient with moderate COPD and persistent dyspnea?
A. Combining bronchodilators with different mechanisms provides greater bronchodilation than either agent
alone
B. LAMAs replace the need for inhaled corticosteroids in all COPD patients
C. LAMAs and LABAs share an identical mechanism, so combination offers no additional benefit
D. Combination therapy is reserved only for acute exacerbations
Correct Answer: A
Rationale: LAMAs and LABAs act through distinct mechanisms, anticholinergic and beta-2 adrenergic
respectively, and their combination produces greater bronchodilation and symptom improvement than either class
alone in patients with persistent symptoms. They do not universally replace inhaled corticosteroids, do not share
an identical mechanism, and are used for maintenance rather than solely acute exacerbation therapy.
Question 10
A patient with Crohn's disease is started on infliximab. Which screening is essential prior to initiation due to risk
of reactivation?
A. Latent tuberculosis and hepatitis B screening
B. Screening for iron deficiency only
C. Screening for hypothyroidism only
D. No screening is required before biologic therapy
Correct Answer: A
Rationale: TNF-alpha inhibitors like infliximab can reactivate latent tuberculosis and hepatitis B due to
suppression of immune surveillance, making baseline screening for both essential before initiating therapy. Iron
deficiency and thyroid screening are not the specific safety concerns associated with immunosuppressive biologic
initiation.
