Advanced Pathophysiology
Examination-Clinical Case-Based
Questions (2026 Update) questions
and answers with rationales/graded
A+/2026 update/100% correct /instant
download
Instructions: For each clinical case, select the best answer. Correct answers
are bolded and highlighted. Rationales are provided.
Section 1: Cardiovascular Pathophysiology
1. A 68-year-old man with hypertension presents with exertional chest
pressure relieved by rest. ECG shows ST-segment depression during exercise.
Which pathophysiologic mechanism is most likely?
A. Complete coronary artery occlusion with thrombus
B. Reduced coronary perfusion reserve due to fixed epicardial stenosis
C. Coronary artery vasospasm without atherosclerosis
D. Microvascular dysfunction with elevated end-diastolic pressure
Rationale: Stable angina is from fixed atherosclerotic stenosis → reduced
perfusion reserve. Demand exceeds supply during exertion; rest restores balance.
2. A 55-year-old with acute shortness of breath and elevated jugular venous
pressure has a new hologystolic murmur at the left sternal border.
Echocardiogram shows to-and-fro flow across a ventricular septal defect with
preserved right ventricular function. Which pathophysiology explains the
murmur?
A. Turbulent flow from left ventricle to right ventricle during systole
B. Turbulent flow across a restrictive VSD during systole; to-and-fro suggests
associated aortic regurgitation
, C. Continuous flow through a patent ductus arteriosus
D. Systolic flow into a non-compliant right ventricle
Rationale: Hologystolic murmur at LSB = VSD; to-and-fro Doppler suggests
concomitant aortic regurgitation or aortico-left ventricular tunnel.
Section 2: Pulmonary Pathophysiology
3. A 72-year-old former smoker with progressive dyspnea has reduced DLCO
and CT shows upper lobe emphysema. Which molecular mechanism is most
implicated in alpha-1 antitrypsin deficiency?
A. Increased neutrophil elastase activity unopposed by AAT
B. Uninhibited neutrophil elastase leading to alveolar wall destruction
C. Matrix metalloproteinase-9 overexpression
D. Decreased surfactant protein B production
Rationale: AAT deficiency → unopposed neutrophil elastase destroys elastin →
panacinar (or predominantly lower lobe) emphysema, but in ZZ phenotype upper
lobe can be involved due to altered protease burden.
4. A 34-year-old with HIV and CD4 count 50 presents with fever, dry cough,
and hypoxemia. LDH is elevated. Which pathogen-induced pathophysiology is
most likely?
A. Alveolar flooding with proteinaceous debris due to Pneumocystis jirovecii
B. Thickened alveolar septa with eosinophilic foamy material and cysts
C. Granulomatous inflammation with caseous necrosis
D. Diffuse alveolar damage with hyaline membranes
Rationale: P. jirovecii causes interstitial pneumonitis with foamy alveolar exudate
and cyst forms; LDH rises from lung injury. Classic in CD4 <200.
Section 3: Renal Pathophysiology
5. A 45-year-old with diabetes and hypertension presents with nephrotic-range
proteinuria (6 g/day) and normal-sized kidneys on ultrasound. Which
glomerular lesion is most consistent?
A. Focal segmental glomerulosclerosis (FSGS) – collapsing variant
B. Diffuse nodular glomerulosclerosis (Kimmelstiel-Wilson lesions)
Examination-Clinical Case-Based
Questions (2026 Update) questions
and answers with rationales/graded
A+/2026 update/100% correct /instant
download
Instructions: For each clinical case, select the best answer. Correct answers
are bolded and highlighted. Rationales are provided.
Section 1: Cardiovascular Pathophysiology
1. A 68-year-old man with hypertension presents with exertional chest
pressure relieved by rest. ECG shows ST-segment depression during exercise.
Which pathophysiologic mechanism is most likely?
A. Complete coronary artery occlusion with thrombus
B. Reduced coronary perfusion reserve due to fixed epicardial stenosis
C. Coronary artery vasospasm without atherosclerosis
D. Microvascular dysfunction with elevated end-diastolic pressure
Rationale: Stable angina is from fixed atherosclerotic stenosis → reduced
perfusion reserve. Demand exceeds supply during exertion; rest restores balance.
2. A 55-year-old with acute shortness of breath and elevated jugular venous
pressure has a new hologystolic murmur at the left sternal border.
Echocardiogram shows to-and-fro flow across a ventricular septal defect with
preserved right ventricular function. Which pathophysiology explains the
murmur?
A. Turbulent flow from left ventricle to right ventricle during systole
B. Turbulent flow across a restrictive VSD during systole; to-and-fro suggests
associated aortic regurgitation
, C. Continuous flow through a patent ductus arteriosus
D. Systolic flow into a non-compliant right ventricle
Rationale: Hologystolic murmur at LSB = VSD; to-and-fro Doppler suggests
concomitant aortic regurgitation or aortico-left ventricular tunnel.
Section 2: Pulmonary Pathophysiology
3. A 72-year-old former smoker with progressive dyspnea has reduced DLCO
and CT shows upper lobe emphysema. Which molecular mechanism is most
implicated in alpha-1 antitrypsin deficiency?
A. Increased neutrophil elastase activity unopposed by AAT
B. Uninhibited neutrophil elastase leading to alveolar wall destruction
C. Matrix metalloproteinase-9 overexpression
D. Decreased surfactant protein B production
Rationale: AAT deficiency → unopposed neutrophil elastase destroys elastin →
panacinar (or predominantly lower lobe) emphysema, but in ZZ phenotype upper
lobe can be involved due to altered protease burden.
4. A 34-year-old with HIV and CD4 count 50 presents with fever, dry cough,
and hypoxemia. LDH is elevated. Which pathogen-induced pathophysiology is
most likely?
A. Alveolar flooding with proteinaceous debris due to Pneumocystis jirovecii
B. Thickened alveolar septa with eosinophilic foamy material and cysts
C. Granulomatous inflammation with caseous necrosis
D. Diffuse alveolar damage with hyaline membranes
Rationale: P. jirovecii causes interstitial pneumonitis with foamy alveolar exudate
and cyst forms; LDH rises from lung injury. Classic in CD4 <200.
Section 3: Renal Pathophysiology
5. A 45-year-old with diabetes and hypertension presents with nephrotic-range
proteinuria (6 g/day) and normal-sized kidneys on ultrasound. Which
glomerular lesion is most consistent?
A. Focal segmental glomerulosclerosis (FSGS) – collapsing variant
B. Diffuse nodular glomerulosclerosis (Kimmelstiel-Wilson lesions)
