NR507 / NR 507 Advanced Pathophysiology Final
Exam (Latest 2026/2027) – Complete Review,
Practice Questions & Study Guide | Guaranteed
Pass
105 questions | doctoral-level synthesis rationales | integrated multi-system focus
Section 1: Multi-System Pathophysiological Integration
Q1. A 42-year-old with severe Plasmodium falciparum malaria develops hemoglobinuria,
hypotension, and rising creatinine. Which initial pathophysiological trigger best explains
the subsequent AKI?
A) Intra-erythrocytic parasite consumption of renal cortical oxygen
B) Hemolysis → free Hb → NO scavenging → renal vasoconstriction → ↓ medullary
blood flow
C) Direct bacterial endotoxin injury to renal tubules
D) Antibody-mediated blockade of angiotensin II receptors
Correct Answer: B
Rationale: Massive hemolysis releases cell-free Hb that avidly binds nitric-oxide (NO).
Acute NO depletion produces renal vasoconstriction and ↓ medullary perfusion,
initiating AKI before frank hypotension. Option C describes bacterial sepsis, not malaria;
A is physiologically incorrect; D is pharmacologic, not pathophysiologic.
,Q2. A patient with septic shock receives high-dose vasopressin. Urine output falls
despite ↑ MAP. Which vasopressin-mediated mechanism most contributes to the
oliguria?
A) Preferential efferent-arteriolar constriction → ↓ GFR
B) V1-receptor–mediated vasoconstriction of renal medullary vessels → ↑ medullary
hypoxia → tubular dysfunction
C) V2-receptor–driven aquaporin-2 insertion → water retention → ↓ urine volume
D) ADH-induced ↑ urea recycling → ↑ medullary osmotic gradient
Correct Answer: B
Rationale: High-dose vasopressin activates V1 receptors on medullary vasa recta,
reducing perfusion and precipitating tubulo-glomerular feedback-mediated ↓ GFR. C & D
describe physiologic water retention, not pathologic oliguria; A misattributes the
receptor site.
Q3. A cirrhotic patient develops spontaneous bacterial peritonitis followed by
hepatorenal syndrome (HRS). The earliest driver of renal vasoconstriction in HRS is:
A) Direct bacterial endotoxin injury to renal tubules
B) Systemic arterial vasodilation → ↓ effective arterial blood volume → renin surge
C) Intra-hepatic compression of renal veins
D) Antibody deposition in glomerular basement membrane
Correct Answer: B
,Rationale: Splanchnic & systemic arterial vasodilation (B) drop effective circulating
volume, triggering RAAS/sympathetic renal vasoconstriction despite true volume
overload. A produces ATN, not HRS; C and D are anatomically incorrect.
Q4. A patient with cystic fibrosis (ΔF508/ΔF508) presents with new-onset diabetes. The
primary pathophysiological link between CFTR dysfunction and hyperglycemia is:
A) Auto-immune destruction of β-cells
B) Thick secretions obstructing pancreatic ducts → acinar atrophy → islet fibrosis
C) CFTR defect in β-cell membrane → impaired insulin exocytosis
D) Chronic hypoxemia → β-cell apoptosis
Correct Answer: B
Rationale: Viscous secretions obstruct pancreatic ducts → acinar loss & periductal
fibrosis extending to islets (B). CFTR is not expressed in β-cells (C); A describes T1DM
unrelated to CF.
Q5. A patient with COPD and cor pulmonale develops new ascites. The most likely
contributor is:
A) Right-ventricular failure → ↑ hepatic venous pressure → sinusoidal hypertension
B) Hypoxic hepatitis → ↓ albumin synthesis
C) Tricuspid regurgitation → portal venous hypertension
D) Secondary biliary cirrhosis
Correct Answer: A
, Rationale: RV failure (A) raises hepatic venous pressure, producing cardiac-cirrhosis
ascites. Hypoxic hepatitis (B) causes ↑ AST, not ascites; portal HTN (C) requires
cirrhosis or pre-hepatic block; D is chronic, not acute.
Q6. A type 2 diabetic on SGLT2-i presents with euglycemic ketoacidosis. The
mechanistic explanation is:
A) SGLT2 inhibition ↑ glucagon → ↑ lipolysis → ↑ ketogenesis despite normoglycemia
B) Renal glucose loss triggers insulin hypersecretion → ketone re-uptake
C) Volume depletion causes anion-gap acidosis from lactate
D) Drug inhibits ketone body excretion
Correct Answer: A
Rationale: SGLT2-i raises glucagon/insulin ratio, stimulating lipolysis & ketogenesis
while glucose remains normal (A). No evidence for B or D; C produces non-ketotic gap
acidosis.
Q7. A patient with advanced HIV (CD4 50) starts integrase inhibitor therapy and within 2
weeks develops high fevers, lymphadenopathy, and pulmonary infiltrates. This is best
explained by:
A) Drug hypersensitivity pneumonitis
B) IRIS—immune reconstitution inflammatory syndrome—exuberant Th1 response to
subclinical opportunists
C) Direct integrase mitochondrial toxicity
Exam (Latest 2026/2027) – Complete Review,
Practice Questions & Study Guide | Guaranteed
Pass
105 questions | doctoral-level synthesis rationales | integrated multi-system focus
Section 1: Multi-System Pathophysiological Integration
Q1. A 42-year-old with severe Plasmodium falciparum malaria develops hemoglobinuria,
hypotension, and rising creatinine. Which initial pathophysiological trigger best explains
the subsequent AKI?
A) Intra-erythrocytic parasite consumption of renal cortical oxygen
B) Hemolysis → free Hb → NO scavenging → renal vasoconstriction → ↓ medullary
blood flow
C) Direct bacterial endotoxin injury to renal tubules
D) Antibody-mediated blockade of angiotensin II receptors
Correct Answer: B
Rationale: Massive hemolysis releases cell-free Hb that avidly binds nitric-oxide (NO).
Acute NO depletion produces renal vasoconstriction and ↓ medullary perfusion,
initiating AKI before frank hypotension. Option C describes bacterial sepsis, not malaria;
A is physiologically incorrect; D is pharmacologic, not pathophysiologic.
,Q2. A patient with septic shock receives high-dose vasopressin. Urine output falls
despite ↑ MAP. Which vasopressin-mediated mechanism most contributes to the
oliguria?
A) Preferential efferent-arteriolar constriction → ↓ GFR
B) V1-receptor–mediated vasoconstriction of renal medullary vessels → ↑ medullary
hypoxia → tubular dysfunction
C) V2-receptor–driven aquaporin-2 insertion → water retention → ↓ urine volume
D) ADH-induced ↑ urea recycling → ↑ medullary osmotic gradient
Correct Answer: B
Rationale: High-dose vasopressin activates V1 receptors on medullary vasa recta,
reducing perfusion and precipitating tubulo-glomerular feedback-mediated ↓ GFR. C & D
describe physiologic water retention, not pathologic oliguria; A misattributes the
receptor site.
Q3. A cirrhotic patient develops spontaneous bacterial peritonitis followed by
hepatorenal syndrome (HRS). The earliest driver of renal vasoconstriction in HRS is:
A) Direct bacterial endotoxin injury to renal tubules
B) Systemic arterial vasodilation → ↓ effective arterial blood volume → renin surge
C) Intra-hepatic compression of renal veins
D) Antibody deposition in glomerular basement membrane
Correct Answer: B
,Rationale: Splanchnic & systemic arterial vasodilation (B) drop effective circulating
volume, triggering RAAS/sympathetic renal vasoconstriction despite true volume
overload. A produces ATN, not HRS; C and D are anatomically incorrect.
Q4. A patient with cystic fibrosis (ΔF508/ΔF508) presents with new-onset diabetes. The
primary pathophysiological link between CFTR dysfunction and hyperglycemia is:
A) Auto-immune destruction of β-cells
B) Thick secretions obstructing pancreatic ducts → acinar atrophy → islet fibrosis
C) CFTR defect in β-cell membrane → impaired insulin exocytosis
D) Chronic hypoxemia → β-cell apoptosis
Correct Answer: B
Rationale: Viscous secretions obstruct pancreatic ducts → acinar loss & periductal
fibrosis extending to islets (B). CFTR is not expressed in β-cells (C); A describes T1DM
unrelated to CF.
Q5. A patient with COPD and cor pulmonale develops new ascites. The most likely
contributor is:
A) Right-ventricular failure → ↑ hepatic venous pressure → sinusoidal hypertension
B) Hypoxic hepatitis → ↓ albumin synthesis
C) Tricuspid regurgitation → portal venous hypertension
D) Secondary biliary cirrhosis
Correct Answer: A
, Rationale: RV failure (A) raises hepatic venous pressure, producing cardiac-cirrhosis
ascites. Hypoxic hepatitis (B) causes ↑ AST, not ascites; portal HTN (C) requires
cirrhosis or pre-hepatic block; D is chronic, not acute.
Q6. A type 2 diabetic on SGLT2-i presents with euglycemic ketoacidosis. The
mechanistic explanation is:
A) SGLT2 inhibition ↑ glucagon → ↑ lipolysis → ↑ ketogenesis despite normoglycemia
B) Renal glucose loss triggers insulin hypersecretion → ketone re-uptake
C) Volume depletion causes anion-gap acidosis from lactate
D) Drug inhibits ketone body excretion
Correct Answer: A
Rationale: SGLT2-i raises glucagon/insulin ratio, stimulating lipolysis & ketogenesis
while glucose remains normal (A). No evidence for B or D; C produces non-ketotic gap
acidosis.
Q7. A patient with advanced HIV (CD4 50) starts integrase inhibitor therapy and within 2
weeks develops high fevers, lymphadenopathy, and pulmonary infiltrates. This is best
explained by:
A) Drug hypersensitivity pneumonitis
B) IRIS—immune reconstitution inflammatory syndrome—exuberant Th1 response to
subclinical opportunists
C) Direct integrase mitochondrial toxicity
