NSG527 Final Exam Question Bank (Latest 2026/2027
Edition) – 50 Questions, Answers & Detailed
Rationales
──────────────────────────────
SECTION 1: ADVANCED PATHOPHYSIOLOGY AND DISEASE MANAGEMENT
──────────────────────────────
Question 1
A 68-year-old male with a 20-year history of type 2 diabetes mellitus presents with
progressive dyspnea on exertion, orthopnea, and bilateral lower extremity edema. His
echocardiogram reveals a left ventricular ejection fraction of 30% with diastolic
dysfunction. Which pathophysiological mechanism best explains the primary cause of
his heart failure with preserved ejection fraction (HFpEF) in the context of long-standing
diabetes?
A. Activation of the renin-angiotensin-aldosterone system causing volume overload
B. Chronic hyperglycemia-induced advanced glycation end-product (AGE) accumulation
and myocardial fibrosis
C. Coronary artery microvascular dysfunction leading to recurrent silent ischemia
D. Autonomic neuropathy causing impaired baroreceptor reflex and tachycardia
Correct Answer:
B — Chronic hyperglycemia-induced advanced glycation end-product (AGE)
accumulation and myocardial fibrosis
Rationale:
In long-standing diabetes, HFpEF is primarily driven by AGE-mediated collagen
cross-linking and interstitial fibrosis, which increase myocardial stiffness and impair
relaxation. While RAAS activation (A) contributes to heart failure generally, it is not the
,defining mechanism of diabetic HFpEF. Microvascular dysfunction (C) and autonomic
neuropathy (D) are contributing factors but do not directly cause the stiff, noncompliant
ventricle characteristic of HFpEF.
Question 2
A 54-year-old female with metastatic breast cancer receiving doxorubicin-based
chemotherapy develops acute-onset chest pain, ST-segment elevation, and elevated
troponin I levels. Echocardiography shows new global hypokinesis with an ejection
fraction of 35%. Which cellular mechanism is most directly responsible for this
cardiotoxic presentation?
A. Inhibition of topoisomerase IIβ leading to DNA double-strand breaks in
cardiomyocytes
B. Generation of reactive oxygen species and iron-mediated free radical damage to
mitochondrial membranes
C. Blockade of HER2 signaling pathways essential for cardiomyocyte survival
D. Activation of the p53 tumor suppressor pathway inducing cardiomyocyte apoptosis
Correct Answer:
B — Generation of reactive oxygen species and iron-mediated free radical damage to
mitochondrial membranes
Rationale:
Anthracycline cardiotoxicity is classically mediated by iron-catalyzed ROS generation
that damages mitochondrial DNA and membranes, leading to cardiomyocyte death.
Topoisomerase IIβ inhibition (A) is an emerging mechanism but is not the primary driver
of acute cardiotoxicity. HER2 blockade (C) describes trastuzumab toxicity, and p53
activation (D) is a downstream consequence rather than the initiating event.
Question 3
,A 42-year-old male with a history of intravenous drug use presents with fever, a new
holosystolic murmur at the left lower sternal border, and multiple peripheral embolic
lesions on his extremities. Blood cultures grow Staphylococcus aureus.
Transesophageal echocardiography reveals a 1.2 cm vegetation on the tricuspid valve.
Which complication is most likely to occur if this infection progresses untreated?
A. Septic pulmonary emboli with cavitary lung abscesses
B. Mycotic aneurysm of the abdominal aorta
C. Splenic abscess formation
D. Janeway lesions progressing to digital gangrene
Correct Answer:
A — Septic pulmonary emboli with cavitary lung abscesses
Rationale:
Tricuspid valve endocarditis in IV drug users characteristically causes septic pulmonary
emboli due to the right-sided nature of the infection, with emboli traveling to the
pulmonary circulation. Mycotic aneurysms (B) and splenic abscesses (C) are
complications of left-sided endocarditis. Janeway lesions (D) are non-tender embolic
phenomena but do not typically progress to gangrene.
Question 4
A 71-year-old female with chronic obstructive pulmonary disease (COPD) presents with
worsening dyspnea, increased sputum purulence, and a new right-sided pleuritic chest
pain. Chest X-ray reveals a right lower lobe infiltrate with a small pleural effusion.
Arterial blood gas on room air shows pH 7.32, PaCO2 68 mmHg, PaO2 52 mmHg, and
HCO3 34 mEq/L. Which acid-base disorder is present, and what is the primary
compensatory mechanism?
A. Acute respiratory acidosis with renal bicarbonate retention
B. Chronic respiratory acidosis with renal bicarbonate generation and retention
C. Metabolic alkalosis with hypoventilation as compensatory response
, D. Mixed respiratory and metabolic acidosis with incomplete compensation
Correct Answer:
B — Chronic respiratory acidosis with renal bicarbonate generation and retention
Rationale:
The elevated PaCO2 with near-normal pH and elevated bicarbonate indicates chronic
respiratory acidosis, where renal compensation has had time to generate and retain
bicarbonate. In acute respiratory acidosis (A), bicarbonate would rise only 1 mEq/L per
10 mmHg increase in PaCO2, not the 4 mEq/L seen here. Metabolic alkalosis (C) would
not present with this degree of hypercapnia, and a mixed disorder (D) is not supported
by the data.
Question 5
A 35-year-old female presents with fatigue, joint pain, and a malar rash. Laboratory
studies reveal positive antinuclear antibodies (ANA) at 1:640, anti-double-stranded DNA
antibodies, and low complement levels. She develops acute-onset confusion, seizures,
and proteinuria with active urinary sediment. Which pathophysiological process is most
responsible for her neuropsychiatric manifestations?
A. Antiphospholipid antibody-mediated thrombosis of cerebral microvasculature
B. Circulating immune complex deposition in the choroid plexus causing vasculitis
C. Cross-reactivity of anti-dsDNA antibodies with N-methyl-D-aspartate (NMDA)
receptors
D. Cytokine-mediated blood-brain barrier disruption with microglial activation
Correct Answer:
C — Cross-reactivity of anti-dsDNA antibodies with N-methyl-D-aspartate (NMDA)
receptors
Rationale:
Edition) – 50 Questions, Answers & Detailed
Rationales
──────────────────────────────
SECTION 1: ADVANCED PATHOPHYSIOLOGY AND DISEASE MANAGEMENT
──────────────────────────────
Question 1
A 68-year-old male with a 20-year history of type 2 diabetes mellitus presents with
progressive dyspnea on exertion, orthopnea, and bilateral lower extremity edema. His
echocardiogram reveals a left ventricular ejection fraction of 30% with diastolic
dysfunction. Which pathophysiological mechanism best explains the primary cause of
his heart failure with preserved ejection fraction (HFpEF) in the context of long-standing
diabetes?
A. Activation of the renin-angiotensin-aldosterone system causing volume overload
B. Chronic hyperglycemia-induced advanced glycation end-product (AGE) accumulation
and myocardial fibrosis
C. Coronary artery microvascular dysfunction leading to recurrent silent ischemia
D. Autonomic neuropathy causing impaired baroreceptor reflex and tachycardia
Correct Answer:
B — Chronic hyperglycemia-induced advanced glycation end-product (AGE)
accumulation and myocardial fibrosis
Rationale:
In long-standing diabetes, HFpEF is primarily driven by AGE-mediated collagen
cross-linking and interstitial fibrosis, which increase myocardial stiffness and impair
relaxation. While RAAS activation (A) contributes to heart failure generally, it is not the
,defining mechanism of diabetic HFpEF. Microvascular dysfunction (C) and autonomic
neuropathy (D) are contributing factors but do not directly cause the stiff, noncompliant
ventricle characteristic of HFpEF.
Question 2
A 54-year-old female with metastatic breast cancer receiving doxorubicin-based
chemotherapy develops acute-onset chest pain, ST-segment elevation, and elevated
troponin I levels. Echocardiography shows new global hypokinesis with an ejection
fraction of 35%. Which cellular mechanism is most directly responsible for this
cardiotoxic presentation?
A. Inhibition of topoisomerase IIβ leading to DNA double-strand breaks in
cardiomyocytes
B. Generation of reactive oxygen species and iron-mediated free radical damage to
mitochondrial membranes
C. Blockade of HER2 signaling pathways essential for cardiomyocyte survival
D. Activation of the p53 tumor suppressor pathway inducing cardiomyocyte apoptosis
Correct Answer:
B — Generation of reactive oxygen species and iron-mediated free radical damage to
mitochondrial membranes
Rationale:
Anthracycline cardiotoxicity is classically mediated by iron-catalyzed ROS generation
that damages mitochondrial DNA and membranes, leading to cardiomyocyte death.
Topoisomerase IIβ inhibition (A) is an emerging mechanism but is not the primary driver
of acute cardiotoxicity. HER2 blockade (C) describes trastuzumab toxicity, and p53
activation (D) is a downstream consequence rather than the initiating event.
Question 3
,A 42-year-old male with a history of intravenous drug use presents with fever, a new
holosystolic murmur at the left lower sternal border, and multiple peripheral embolic
lesions on his extremities. Blood cultures grow Staphylococcus aureus.
Transesophageal echocardiography reveals a 1.2 cm vegetation on the tricuspid valve.
Which complication is most likely to occur if this infection progresses untreated?
A. Septic pulmonary emboli with cavitary lung abscesses
B. Mycotic aneurysm of the abdominal aorta
C. Splenic abscess formation
D. Janeway lesions progressing to digital gangrene
Correct Answer:
A — Septic pulmonary emboli with cavitary lung abscesses
Rationale:
Tricuspid valve endocarditis in IV drug users characteristically causes septic pulmonary
emboli due to the right-sided nature of the infection, with emboli traveling to the
pulmonary circulation. Mycotic aneurysms (B) and splenic abscesses (C) are
complications of left-sided endocarditis. Janeway lesions (D) are non-tender embolic
phenomena but do not typically progress to gangrene.
Question 4
A 71-year-old female with chronic obstructive pulmonary disease (COPD) presents with
worsening dyspnea, increased sputum purulence, and a new right-sided pleuritic chest
pain. Chest X-ray reveals a right lower lobe infiltrate with a small pleural effusion.
Arterial blood gas on room air shows pH 7.32, PaCO2 68 mmHg, PaO2 52 mmHg, and
HCO3 34 mEq/L. Which acid-base disorder is present, and what is the primary
compensatory mechanism?
A. Acute respiratory acidosis with renal bicarbonate retention
B. Chronic respiratory acidosis with renal bicarbonate generation and retention
C. Metabolic alkalosis with hypoventilation as compensatory response
, D. Mixed respiratory and metabolic acidosis with incomplete compensation
Correct Answer:
B — Chronic respiratory acidosis with renal bicarbonate generation and retention
Rationale:
The elevated PaCO2 with near-normal pH and elevated bicarbonate indicates chronic
respiratory acidosis, where renal compensation has had time to generate and retain
bicarbonate. In acute respiratory acidosis (A), bicarbonate would rise only 1 mEq/L per
10 mmHg increase in PaCO2, not the 4 mEq/L seen here. Metabolic alkalosis (C) would
not present with this degree of hypercapnia, and a mixed disorder (D) is not supported
by the data.
Question 5
A 35-year-old female presents with fatigue, joint pain, and a malar rash. Laboratory
studies reveal positive antinuclear antibodies (ANA) at 1:640, anti-double-stranded DNA
antibodies, and low complement levels. She develops acute-onset confusion, seizures,
and proteinuria with active urinary sediment. Which pathophysiological process is most
responsible for her neuropsychiatric manifestations?
A. Antiphospholipid antibody-mediated thrombosis of cerebral microvasculature
B. Circulating immune complex deposition in the choroid plexus causing vasculitis
C. Cross-reactivity of anti-dsDNA antibodies with N-methyl-D-aspartate (NMDA)
receptors
D. Cytokine-mediated blood-brain barrier disruption with microglial activation
Correct Answer:
C — Cross-reactivity of anti-dsDNA antibodies with N-methyl-D-aspartate (NMDA)
receptors
Rationale:
