Capella University
Course Number: NURS-FPX4015
Course Title: Pharmacology
Exam: Final
Date:2026
A 58-year-old male with a 30-pack-year smoking history presents to the emergency department
with progressive dyspnea, barrel chest, pursed-lip breathing, and an SpO₂ of 88% on room air. His
ABG reveals pH 7.34, PaCO₂ 58 mmHg, PaO₂ 55 mmHg, and HCO₃⁻ 30 mEq/L. He is currently on
home oxygen at 2 L/min.
Which of the following BEST explains the rationale for cautious oxygen administration in this
patient?
A) High-flow oxygen increases the risk of oxygen toxicity to the alveolar epithelium, causing
diffuse alveolar damage
B) Chronic hypercapnia has blunted the central chemoreceptor response, making hypoxemia the
primary drive for ventilation
C) Supplemental oxygen causes bronchoconstriction in patients with COPD by activating
parasympathetic pathways
D) High FiO₂ causes mucociliary dysfunction, leading to mucus retention and atelectasis
Correct Answer: B
Rationale: In patients with chronic obstructive pulmonary disease and long-standing hypercapnia,
the central chemoreceptors in the medulla become desensitized to elevated CO₂ levels due to
1
,compensatory bicarbonate retention that normalizes CSF pH. These patients therefore rely
predominantly on the hypoxic drive — mediated by peripheral chemoreceptors in the carotid and
aortic bodies — to maintain ventilatory effort. Administering high-flow oxygen abolishes this
hypoxic drive, potentially leading to hypoventilation, worsening CO₂ retention, and respiratory
acidosis. This is sometimes called the "hypoxic drive theory." The ABG in this case confirms
chronic compensated respiratory acidosis (elevated PaCO₂, elevated HCO₃⁻, near-normal pH),
consistent with this pathophysiology.
---
A 45-year-old woman with a history of rheumatoid arthritis presents with a "butterfly rash" across
her cheeks and nasal bridge, joint pain, fatigue, and pleuritis. Labs show positive ANA, anti-
dsDNA antibodies, low complement levels (C3 and C4), and a CBC revealing leukopenia and
thrombocytopenia. She is being started on hydroxychloroquine.
The mechanism by which hydroxychloroquine exerts its therapeutic effect in this patient's
condition is MOST accurately described as:
A) Inhibition of cyclooxygenase-1 and cyclooxygenase-2, reducing prostaglandin synthesis and
inflammation
B) Suppression of T-cell proliferation by blocking IL-2 signaling through calcineurin inhibition
C) Accumulation in lysosomes, raising intravacuolar pH and impairing antigen processing and
Toll-like receptor signaling
D) Competitive antagonism of TNF-alpha receptors, reducing downstream NF-κB activation and
cytokine cascade
Correct Answer: C
Rationale: Hydroxychloroquine is an antimalarial drug used as a disease-modifying antirheumatic
drug (DMARD) in SLE and rheumatoid arthritis. It is a weak base that concentrates in acidic
compartments such as lysosomes and endosomes. By raising the intralysosomal pH, it interferes
with antigen processing and presentation by antigen-presenting cells. Additionally, it disrupts the
signaling of endosomal Toll-like receptors (particularly TLR7 and TLR9), which recognize
endogenous nucleic acids — a key driver of the autoimmune response in SLE. Its clinical benefits
2
,include reduction of disease flares, organ damage, and mortality. Options A, B, and D describe the
mechanisms of NSAIDs, calcineurin inhibitors, and anti-TNF biologics, respectively.
---
A 70-year-old man with heart failure (EF 30%) and atrial fibrillation is admitted with worsening
dyspnea and bilateral pitting edema to the knees. His current medications include furosemide 40
mg PO daily, carvedilol 12.5 mg BID, and lisinopril 10 mg daily. He is started on digoxin for rate
control.
During physical assessment, which of the following clinical signs would MOST directly indicate
digoxin toxicity requiring immediate intervention?
A) Bradycardia at 52 bpm with regular rhythm and new complaint of yellow-green visual halos
B) Hypertension with a new S3 gallop and worsening bilateral crackles at lung bases
C) Peripheral edema worsening with jugular venous distension at 45-degree positioning
D) Tachycardia at 110 bpm with irregularly irregular rhythm and mild pitting edema
Correct Answer: A
Rationale: Digoxin toxicity classically presents with a triad of gastrointestinal symptoms (nausea,
vomiting, anorexia), neurological/visual disturbances (xanthopsia — yellow-green visual halos,
blurred vision, photophobia), and cardiac dysrhythmias. The most common cardiac manifestation is
bradycardia and varying degrees of atrioventricular block due to enhanced vagal tone and
suppression of the SA node. Digoxin inhibits the Na⁺/K⁺-ATPase pump, increasing intracellular
sodium, which reduces calcium extrusion via the Na⁺/Ca²⁺ exchanger, thereby increasing
intracellular calcium and myocardial contractility. In toxicity, excessive intracellular calcium leads
to delayed afterdepolarizations and triggered arrhythmias. Risk is heightened with hypokalemia —
common in this patient on furosemide — since potassium and digoxin compete for the same
binding site on the pump. Options B, C, and D reflect worsening heart failure rather than toxicity.
---
3
, A 28-year-old pregnant woman at 32 weeks gestation presents with a blood pressure of 158/104
mmHg on two separate readings, 4+ proteinuria on dipstick, severe headache, visual disturbances,
and hyperreflexia. She has no prior history of hypertension.
Which of the following physiological mechanisms BEST explains the pathogenesis of her
condition?
A) Increased aldosterone secretion leading to sodium and water retention, expanding intravascular
volume
B) Imbalance between placental sFlt-1 and PlGF causing widespread endothelial dysfunction and
vasospasm
C) Autoimmune destruction of renal glomeruli leading to proteinuria and secondary hypertension
D) Elevated angiotensin-converting enzyme activity causing systemic vasoconstriction and reduced
GFR
Correct Answer: B
Rationale: This patient presents with preeclampsia with severe features. The current
pathophysiological model centers on placental ischemia, which triggers the release of soluble fms-
like tyrosine kinase-1 (sFlt-1), an antiangiogenic protein that antagonizes vascular endothelial
growth factor (VEGF) and placental growth factor (PlGF). The resulting imbalance causes
widespread maternal endothelial dysfunction, leading to vasospasm, hypertension, increased
glomerular permeability (proteinuria), and multi-organ involvement. This explains the cerebral
symptoms (severe headache, visual changes), neurological findings (hyperreflexia), and renal
involvement. The condition is a systemic endotheliopathy, not primarily mediated by aldosterone,
autoimmune glomerulonephritis, or ACE overactivity.
---
A 62-year-old woman with type 2 diabetes presents with polyuria, polydipsia, and altered mental
status. Her labs reveal: serum glucose 780 mg/dL, serum osmolality 342 mOsm/kg, BUN 38
mg/dL, creatinine 1.9 mg/dL, Na⁺ 148 mEq/L, K⁺ 5.1 mEq/L, and a pH of 7.38 with minimal
ketonuria. She is admitted for management.
4
Course Number: NURS-FPX4015
Course Title: Pharmacology
Exam: Final
Date:2026
A 58-year-old male with a 30-pack-year smoking history presents to the emergency department
with progressive dyspnea, barrel chest, pursed-lip breathing, and an SpO₂ of 88% on room air. His
ABG reveals pH 7.34, PaCO₂ 58 mmHg, PaO₂ 55 mmHg, and HCO₃⁻ 30 mEq/L. He is currently on
home oxygen at 2 L/min.
Which of the following BEST explains the rationale for cautious oxygen administration in this
patient?
A) High-flow oxygen increases the risk of oxygen toxicity to the alveolar epithelium, causing
diffuse alveolar damage
B) Chronic hypercapnia has blunted the central chemoreceptor response, making hypoxemia the
primary drive for ventilation
C) Supplemental oxygen causes bronchoconstriction in patients with COPD by activating
parasympathetic pathways
D) High FiO₂ causes mucociliary dysfunction, leading to mucus retention and atelectasis
Correct Answer: B
Rationale: In patients with chronic obstructive pulmonary disease and long-standing hypercapnia,
the central chemoreceptors in the medulla become desensitized to elevated CO₂ levels due to
1
,compensatory bicarbonate retention that normalizes CSF pH. These patients therefore rely
predominantly on the hypoxic drive — mediated by peripheral chemoreceptors in the carotid and
aortic bodies — to maintain ventilatory effort. Administering high-flow oxygen abolishes this
hypoxic drive, potentially leading to hypoventilation, worsening CO₂ retention, and respiratory
acidosis. This is sometimes called the "hypoxic drive theory." The ABG in this case confirms
chronic compensated respiratory acidosis (elevated PaCO₂, elevated HCO₃⁻, near-normal pH),
consistent with this pathophysiology.
---
A 45-year-old woman with a history of rheumatoid arthritis presents with a "butterfly rash" across
her cheeks and nasal bridge, joint pain, fatigue, and pleuritis. Labs show positive ANA, anti-
dsDNA antibodies, low complement levels (C3 and C4), and a CBC revealing leukopenia and
thrombocytopenia. She is being started on hydroxychloroquine.
The mechanism by which hydroxychloroquine exerts its therapeutic effect in this patient's
condition is MOST accurately described as:
A) Inhibition of cyclooxygenase-1 and cyclooxygenase-2, reducing prostaglandin synthesis and
inflammation
B) Suppression of T-cell proliferation by blocking IL-2 signaling through calcineurin inhibition
C) Accumulation in lysosomes, raising intravacuolar pH and impairing antigen processing and
Toll-like receptor signaling
D) Competitive antagonism of TNF-alpha receptors, reducing downstream NF-κB activation and
cytokine cascade
Correct Answer: C
Rationale: Hydroxychloroquine is an antimalarial drug used as a disease-modifying antirheumatic
drug (DMARD) in SLE and rheumatoid arthritis. It is a weak base that concentrates in acidic
compartments such as lysosomes and endosomes. By raising the intralysosomal pH, it interferes
with antigen processing and presentation by antigen-presenting cells. Additionally, it disrupts the
signaling of endosomal Toll-like receptors (particularly TLR7 and TLR9), which recognize
endogenous nucleic acids — a key driver of the autoimmune response in SLE. Its clinical benefits
2
,include reduction of disease flares, organ damage, and mortality. Options A, B, and D describe the
mechanisms of NSAIDs, calcineurin inhibitors, and anti-TNF biologics, respectively.
---
A 70-year-old man with heart failure (EF 30%) and atrial fibrillation is admitted with worsening
dyspnea and bilateral pitting edema to the knees. His current medications include furosemide 40
mg PO daily, carvedilol 12.5 mg BID, and lisinopril 10 mg daily. He is started on digoxin for rate
control.
During physical assessment, which of the following clinical signs would MOST directly indicate
digoxin toxicity requiring immediate intervention?
A) Bradycardia at 52 bpm with regular rhythm and new complaint of yellow-green visual halos
B) Hypertension with a new S3 gallop and worsening bilateral crackles at lung bases
C) Peripheral edema worsening with jugular venous distension at 45-degree positioning
D) Tachycardia at 110 bpm with irregularly irregular rhythm and mild pitting edema
Correct Answer: A
Rationale: Digoxin toxicity classically presents with a triad of gastrointestinal symptoms (nausea,
vomiting, anorexia), neurological/visual disturbances (xanthopsia — yellow-green visual halos,
blurred vision, photophobia), and cardiac dysrhythmias. The most common cardiac manifestation is
bradycardia and varying degrees of atrioventricular block due to enhanced vagal tone and
suppression of the SA node. Digoxin inhibits the Na⁺/K⁺-ATPase pump, increasing intracellular
sodium, which reduces calcium extrusion via the Na⁺/Ca²⁺ exchanger, thereby increasing
intracellular calcium and myocardial contractility. In toxicity, excessive intracellular calcium leads
to delayed afterdepolarizations and triggered arrhythmias. Risk is heightened with hypokalemia —
common in this patient on furosemide — since potassium and digoxin compete for the same
binding site on the pump. Options B, C, and D reflect worsening heart failure rather than toxicity.
---
3
, A 28-year-old pregnant woman at 32 weeks gestation presents with a blood pressure of 158/104
mmHg on two separate readings, 4+ proteinuria on dipstick, severe headache, visual disturbances,
and hyperreflexia. She has no prior history of hypertension.
Which of the following physiological mechanisms BEST explains the pathogenesis of her
condition?
A) Increased aldosterone secretion leading to sodium and water retention, expanding intravascular
volume
B) Imbalance between placental sFlt-1 and PlGF causing widespread endothelial dysfunction and
vasospasm
C) Autoimmune destruction of renal glomeruli leading to proteinuria and secondary hypertension
D) Elevated angiotensin-converting enzyme activity causing systemic vasoconstriction and reduced
GFR
Correct Answer: B
Rationale: This patient presents with preeclampsia with severe features. The current
pathophysiological model centers on placental ischemia, which triggers the release of soluble fms-
like tyrosine kinase-1 (sFlt-1), an antiangiogenic protein that antagonizes vascular endothelial
growth factor (VEGF) and placental growth factor (PlGF). The resulting imbalance causes
widespread maternal endothelial dysfunction, leading to vasospasm, hypertension, increased
glomerular permeability (proteinuria), and multi-organ involvement. This explains the cerebral
symptoms (severe headache, visual changes), neurological findings (hyperreflexia), and renal
involvement. The condition is a systemic endotheliopathy, not primarily mediated by aldosterone,
autoimmune glomerulonephritis, or ACE overactivity.
---
A 62-year-old woman with type 2 diabetes presents with polyuria, polydipsia, and altered mental
status. Her labs reveal: serum glucose 780 mg/dL, serum osmolality 342 mOsm/kg, BUN 38
mg/dL, creatinine 1.9 mg/dL, Na⁺ 148 mEq/L, K⁺ 5.1 mEq/L, and a pH of 7.38 with minimal
ketonuria. She is admitted for management.
4
