NSG 5442 Final Exam: 55 Questions with Correct
Answers & Complete Solutions | South College
(2026/2027 Edition)
SECTION 1: ADVANCED PATHOPHYSIOLOGY
Question 1.
A 58-year-old patient with poorly controlled type 2 diabetes presents with progressive
numbness and burning pain in a stocking-glove distribution. Nerve conduction studies
reveal both demyelination and axonal degeneration. Which pathophysiological
mechanism best explains this mixed pattern in diabetic peripheral neuropathy?
A. Chronic hyperglycemia activates the polyol pathway, leading to sorbitol accumulation
and osmotic stress in Schwann cells
B. Advanced glycation end-products (AGEs) accumulate in the vasa nervorum, causing
ischemia and oxidative stress
C. Insulin deficiency directly inhibits neurotrophic factor synthesis, causing primary
axonal atrophy
D. Hyperglycemia-induced hypokalemia depolarizes nerve membranes, causing
continuous ectopic firing
Correct Answer: B. Advanced glycation end-products (AGEs) accumulate in the vasa
nervorum, causing ischemia and oxidative stress
Rationale: Diabetic peripheral neuropathy (DPN) involves a mixed demyelinating and
axonal pattern driven by microvascular dysfunction. AGE deposition in the vasa
nervorum induces endothelial dysfunction, basement membrane thickening, and
ischemia, while also generating reactive oxygen species via NADPH oxidase activation.
This dual microvascular-oxidative insult damages both myelinating Schwann cells
(demyelination) and axons. Option A (polyol pathway) contributes to osmotic and
,oxidative stress but primarily explains sensory symptoms, not the mixed pattern. Option
C is incorrect because insulin deficiency is not the direct cause of neurotrophic failure in
type 2 diabetes. Option D is physiologically incorrect; hyperglycemia does not induce
hypokalemia-mediated nerve depolarization.
Question 2.
A patient with chronic heart failure and reduced ejection fraction (HFrEF) develops
worsening dyspnea and peripheral edema despite optimal guideline-directed medical
therapy. Echocardiography reveals cardiac remodeling with left ventricular dilation and
increased sphericity. Which molecular pathway is the primary driver of this adverse
remodeling process?
A. Overactivation of protein kinase A (PKA) leading to increased contractile protein
phosphorylation
B. Sustained activation of the renin-angiotensin-aldosterone system (RAAS) and
sympathetic nervous system
C. Downregulation of beta-1 adrenergic receptors due to chronic catecholamine
exposure
D. Increased nitric oxide (NO) bioavailability causing excessive vasodilation and
afterload reduction
Correct Answer: B. Sustained activation of the renin-angiotensin-aldosterone system
(RAAS) and sympathetic nervous system
Rationale: Adverse cardiac remodeling in HFrEF is driven by sustained RAAS and
sympathetic activation, leading to myocardial fibrosis, cardiomyocyte hypertrophy, and
apoptosis via angiotensin II and aldosterone-mediated signaling. This results in
progressive LV dilation and geometric alteration. Option A is incorrect because PKA
activation is part of normal beta-adrenergic signaling, not remodeling. Option C (beta-1
downregulation) is a compensatory consequence, not a driver of structural remodeling.
,Option D is incorrect because NO bioavailability is typically reduced, not increased, in
heart failure.
Question 3.
A 45-year-old patient with asthma experiences frequent nighttime awakenings and
requires oral corticosteroid bursts twice in the past year. Bronchoscopy reveals
thickened basement membranes, eosinophilic infiltration, and smooth muscle
hypertrophy. Which cytokine is most central to the type 2 inflammatory cascade driving
this severe eosinophilic asthma phenotype?
A. Interleukin-17 (IL-17)
B. Interleukin-4 (IL-4)
C. Interleukin-8 (IL-8)
D. Tumor necrosis factor-alpha (TNF-α)
Correct Answer: B. Interleukin-4 (IL-4)
Rationale: Severe eosinophilic asthma is characterized by type 2 (T2) inflammation
driven by IL-4, IL-5, and IL-13. IL-4 is central to IgE class switching, eosinophil
recruitment, mucus hypersecretion, and airway remodeling. Current 2026/2027 GINA
guidelines support biologic therapies targeting IL-4/IL-13 (dupilumab) or IL-5
(mepolizumab, reslizumab, benralizumab) for this phenotype. Option A (IL-17) drives
neutrophilic, non-T2 asthma. Option C (IL-8) is a neutrophil chemoattractant. Option D
(TNF-α) is not a primary driver of eosinophilic asthma pathophysiology.
Question 4.
A patient with rheumatoid arthritis (RA) develops progressive interstitial lung disease
(ILD). High-resolution CT shows a usual interstitial pneumonia (UIP) pattern. Which
pathophysiological process best explains the development of RA-associated ILD?
, A. Immune complex deposition in the glomerular basement membrane triggering
complement activation
B. Citrullinated protein antibody (ACPA)-mediated activation of fibroblasts and alveolar
epithelial cell injury
C. Direct invasion of synovial tissue into the pulmonary parenchyma via lymphatic
spread
D. Granulomatous inflammation with caseous necrosis driven by Th1 cells and
macrophages
Correct Answer: B. Citrullinated protein antibody (ACPA)-mediated activation of
fibroblasts and alveolar epithelial cell injury
Rationale: RA-ILD, particularly the UIP pattern, is driven by ACPA-mediated immune
responses that activate lung fibroblasts, promote epithelial-mesenchymal transition,
and induce alveolar epithelial cell apoptosis. Current 2026 ACR/EULAR guidelines
recognize ILD as a major extra-articular manifestation requiring screening in high-risk
RA patients. Option A describes lupus nephritis pathophysiology. Option C is
anatomically implausible. Option D describes tuberculosis or sarcoidosis, not RA-ILD.
Question 5.
A patient with cirrhosis develops spontaneous bacterial peritonitis (SBP). Ascitic fluid
analysis reveals a polymorphonuclear (PMN) count of 450 cells/mm³. Which
pathophysiological alteration in cirrhosis predisposes to this complication?
A. Increased hepatic synthesis of complement proteins enhancing opsonization in the
peritoneum
B. Intestinal bacterial translocation due to impaired Kupffer cell function and increased
intestinal permeability
C. Hyperdynamic circulation increasing splanchnic blood flow and oxygen delivery to
bacteria
D. Upregulation of secretory IgA in the gut lumen preventing bacterial colonization
Answers & Complete Solutions | South College
(2026/2027 Edition)
SECTION 1: ADVANCED PATHOPHYSIOLOGY
Question 1.
A 58-year-old patient with poorly controlled type 2 diabetes presents with progressive
numbness and burning pain in a stocking-glove distribution. Nerve conduction studies
reveal both demyelination and axonal degeneration. Which pathophysiological
mechanism best explains this mixed pattern in diabetic peripheral neuropathy?
A. Chronic hyperglycemia activates the polyol pathway, leading to sorbitol accumulation
and osmotic stress in Schwann cells
B. Advanced glycation end-products (AGEs) accumulate in the vasa nervorum, causing
ischemia and oxidative stress
C. Insulin deficiency directly inhibits neurotrophic factor synthesis, causing primary
axonal atrophy
D. Hyperglycemia-induced hypokalemia depolarizes nerve membranes, causing
continuous ectopic firing
Correct Answer: B. Advanced glycation end-products (AGEs) accumulate in the vasa
nervorum, causing ischemia and oxidative stress
Rationale: Diabetic peripheral neuropathy (DPN) involves a mixed demyelinating and
axonal pattern driven by microvascular dysfunction. AGE deposition in the vasa
nervorum induces endothelial dysfunction, basement membrane thickening, and
ischemia, while also generating reactive oxygen species via NADPH oxidase activation.
This dual microvascular-oxidative insult damages both myelinating Schwann cells
(demyelination) and axons. Option A (polyol pathway) contributes to osmotic and
,oxidative stress but primarily explains sensory symptoms, not the mixed pattern. Option
C is incorrect because insulin deficiency is not the direct cause of neurotrophic failure in
type 2 diabetes. Option D is physiologically incorrect; hyperglycemia does not induce
hypokalemia-mediated nerve depolarization.
Question 2.
A patient with chronic heart failure and reduced ejection fraction (HFrEF) develops
worsening dyspnea and peripheral edema despite optimal guideline-directed medical
therapy. Echocardiography reveals cardiac remodeling with left ventricular dilation and
increased sphericity. Which molecular pathway is the primary driver of this adverse
remodeling process?
A. Overactivation of protein kinase A (PKA) leading to increased contractile protein
phosphorylation
B. Sustained activation of the renin-angiotensin-aldosterone system (RAAS) and
sympathetic nervous system
C. Downregulation of beta-1 adrenergic receptors due to chronic catecholamine
exposure
D. Increased nitric oxide (NO) bioavailability causing excessive vasodilation and
afterload reduction
Correct Answer: B. Sustained activation of the renin-angiotensin-aldosterone system
(RAAS) and sympathetic nervous system
Rationale: Adverse cardiac remodeling in HFrEF is driven by sustained RAAS and
sympathetic activation, leading to myocardial fibrosis, cardiomyocyte hypertrophy, and
apoptosis via angiotensin II and aldosterone-mediated signaling. This results in
progressive LV dilation and geometric alteration. Option A is incorrect because PKA
activation is part of normal beta-adrenergic signaling, not remodeling. Option C (beta-1
downregulation) is a compensatory consequence, not a driver of structural remodeling.
,Option D is incorrect because NO bioavailability is typically reduced, not increased, in
heart failure.
Question 3.
A 45-year-old patient with asthma experiences frequent nighttime awakenings and
requires oral corticosteroid bursts twice in the past year. Bronchoscopy reveals
thickened basement membranes, eosinophilic infiltration, and smooth muscle
hypertrophy. Which cytokine is most central to the type 2 inflammatory cascade driving
this severe eosinophilic asthma phenotype?
A. Interleukin-17 (IL-17)
B. Interleukin-4 (IL-4)
C. Interleukin-8 (IL-8)
D. Tumor necrosis factor-alpha (TNF-α)
Correct Answer: B. Interleukin-4 (IL-4)
Rationale: Severe eosinophilic asthma is characterized by type 2 (T2) inflammation
driven by IL-4, IL-5, and IL-13. IL-4 is central to IgE class switching, eosinophil
recruitment, mucus hypersecretion, and airway remodeling. Current 2026/2027 GINA
guidelines support biologic therapies targeting IL-4/IL-13 (dupilumab) or IL-5
(mepolizumab, reslizumab, benralizumab) for this phenotype. Option A (IL-17) drives
neutrophilic, non-T2 asthma. Option C (IL-8) is a neutrophil chemoattractant. Option D
(TNF-α) is not a primary driver of eosinophilic asthma pathophysiology.
Question 4.
A patient with rheumatoid arthritis (RA) develops progressive interstitial lung disease
(ILD). High-resolution CT shows a usual interstitial pneumonia (UIP) pattern. Which
pathophysiological process best explains the development of RA-associated ILD?
, A. Immune complex deposition in the glomerular basement membrane triggering
complement activation
B. Citrullinated protein antibody (ACPA)-mediated activation of fibroblasts and alveolar
epithelial cell injury
C. Direct invasion of synovial tissue into the pulmonary parenchyma via lymphatic
spread
D. Granulomatous inflammation with caseous necrosis driven by Th1 cells and
macrophages
Correct Answer: B. Citrullinated protein antibody (ACPA)-mediated activation of
fibroblasts and alveolar epithelial cell injury
Rationale: RA-ILD, particularly the UIP pattern, is driven by ACPA-mediated immune
responses that activate lung fibroblasts, promote epithelial-mesenchymal transition,
and induce alveolar epithelial cell apoptosis. Current 2026 ACR/EULAR guidelines
recognize ILD as a major extra-articular manifestation requiring screening in high-risk
RA patients. Option A describes lupus nephritis pathophysiology. Option C is
anatomically implausible. Option D describes tuberculosis or sarcoidosis, not RA-ILD.
Question 5.
A patient with cirrhosis develops spontaneous bacterial peritonitis (SBP). Ascitic fluid
analysis reveals a polymorphonuclear (PMN) count of 450 cells/mm³. Which
pathophysiological alteration in cirrhosis predisposes to this complication?
A. Increased hepatic synthesis of complement proteins enhancing opsonization in the
peritoneum
B. Intestinal bacterial translocation due to impaired Kupffer cell function and increased
intestinal permeability
C. Hyperdynamic circulation increasing splanchnic blood flow and oxygen delivery to
bacteria
D. Upregulation of secretory IgA in the gut lumen preventing bacterial colonization
