APEA 3P Advanced Pathophysiology Practice
Questions 2026–2027 – Complete Exam-Style
Questions with Correct Answers & Detailed
Rationales | Verified & Reliable
1.
A 68-year-old patient with long-standing hypertension develops
progressive exertional dyspnea, orthopnea, and bilateral lower-
extremity edema. Echocardiography demonstrates a left
ventricular ejection fraction of 35%. Which pathophysiologic
mechanism most directly contributes to the patient's
pulmonary congestion?
A. Increased pulmonary vascular resistance from chronic
hypoxic vasoconstriction
B. Decreased left atrial pressure causing pulmonary venous
dilation
C. Increased left ventricular end-diastolic pressure transmitted
backward to the pulmonary circulation
D. Reduced systemic venous pressure causing interstitial fluid
accumulation
Correct answer: C
,The reduced left ventricular contractility causes increased end-
systolic and end-diastolic volumes, elevating left ventricular
filling pressure. This pressure is transmitted backward to the left
atrium and pulmonary veins, increasing pulmonary capillary
hydrostatic pressure and promoting movement of fluid into the
pulmonary interstitium and alveoli. This mechanism produces
dyspnea, orthopnea, and pulmonary edema.
2.
A patient with severe chronic obstructive pulmonary disease
has persistent hypoxemia and develops pulmonary
hypertension. Which mechanism is primarily responsible for the
increased pulmonary vascular resistance?
A. Systemic arterial vasoconstriction
B. Hypoxic pulmonary vasoconstriction and vascular
remodeling
C. Increased left ventricular preload
D. Decreased pulmonary arterial smooth-muscle tone
Correct answer: B
Chronic alveolar hypoxia causes pulmonary arteriolar
vasoconstriction. Persistent hypoxia subsequently promotes
vascular remodeling, including smooth-muscle hypertrophy and
intimal changes. These alterations increase pulmonary vascular
,resistance and can eventually produce pulmonary hypertension
and right-sided heart failure.
3.
A patient with diabetic ketoacidosis presents with deep, rapid
respirations. Which physiologic process best explains this
respiratory pattern?
A. Respiratory compensation for metabolic alkalosis
B. Primary respiratory alkalosis caused by hypoxemia
C. Respiratory compensation for metabolic acidosis
D. Respiratory depression caused by cerebral edema
Correct answer: C
Diabetic ketoacidosis produces metabolic acidosis from
accumulation of ketoacids. Chemoreceptors detect the fall in pH
and stimulate increased ventilation. Deep, rapid Kussmaul
respirations increase carbon dioxide elimination, partially
compensating for the metabolic acidosis.
4.
A patient develops acute kidney injury after prolonged
hypotension. Which renal change is most characteristic of
ischemic acute tubular injury?
, A. Increased glomerular filtration caused by afferent arteriolar
dilation
B. Tubular epithelial cell injury with impaired sodium
reabsorption and intratubular obstruction
C. Selective destruction of the glomerular basement membrane
D. Increased erythropoietin production
Correct answer: B
Ischemia damages tubular epithelial cells, particularly in
metabolically active segments such as the proximal tubule and
thick ascending limb. Loss of tubular integrity impairs sodium
and water handling, while cellular debris can obstruct tubular
flow. Back-leak of filtrate and altered intrarenal hemodynamics
further reduce glomerular filtration.
5.
A patient with nephrotic syndrome has marked peripheral
edema and hypoalbuminemia. Which mechanism most directly
contributes to the edema?
A. Increased plasma oncotic pressure
B. Decreased capillary hydrostatic pressure
C. Reduced plasma oncotic pressure from urinary albumin loss
D. Increased lymphatic drainage
Correct answer: C
Questions 2026–2027 – Complete Exam-Style
Questions with Correct Answers & Detailed
Rationales | Verified & Reliable
1.
A 68-year-old patient with long-standing hypertension develops
progressive exertional dyspnea, orthopnea, and bilateral lower-
extremity edema. Echocardiography demonstrates a left
ventricular ejection fraction of 35%. Which pathophysiologic
mechanism most directly contributes to the patient's
pulmonary congestion?
A. Increased pulmonary vascular resistance from chronic
hypoxic vasoconstriction
B. Decreased left atrial pressure causing pulmonary venous
dilation
C. Increased left ventricular end-diastolic pressure transmitted
backward to the pulmonary circulation
D. Reduced systemic venous pressure causing interstitial fluid
accumulation
Correct answer: C
,The reduced left ventricular contractility causes increased end-
systolic and end-diastolic volumes, elevating left ventricular
filling pressure. This pressure is transmitted backward to the left
atrium and pulmonary veins, increasing pulmonary capillary
hydrostatic pressure and promoting movement of fluid into the
pulmonary interstitium and alveoli. This mechanism produces
dyspnea, orthopnea, and pulmonary edema.
2.
A patient with severe chronic obstructive pulmonary disease
has persistent hypoxemia and develops pulmonary
hypertension. Which mechanism is primarily responsible for the
increased pulmonary vascular resistance?
A. Systemic arterial vasoconstriction
B. Hypoxic pulmonary vasoconstriction and vascular
remodeling
C. Increased left ventricular preload
D. Decreased pulmonary arterial smooth-muscle tone
Correct answer: B
Chronic alveolar hypoxia causes pulmonary arteriolar
vasoconstriction. Persistent hypoxia subsequently promotes
vascular remodeling, including smooth-muscle hypertrophy and
intimal changes. These alterations increase pulmonary vascular
,resistance and can eventually produce pulmonary hypertension
and right-sided heart failure.
3.
A patient with diabetic ketoacidosis presents with deep, rapid
respirations. Which physiologic process best explains this
respiratory pattern?
A. Respiratory compensation for metabolic alkalosis
B. Primary respiratory alkalosis caused by hypoxemia
C. Respiratory compensation for metabolic acidosis
D. Respiratory depression caused by cerebral edema
Correct answer: C
Diabetic ketoacidosis produces metabolic acidosis from
accumulation of ketoacids. Chemoreceptors detect the fall in pH
and stimulate increased ventilation. Deep, rapid Kussmaul
respirations increase carbon dioxide elimination, partially
compensating for the metabolic acidosis.
4.
A patient develops acute kidney injury after prolonged
hypotension. Which renal change is most characteristic of
ischemic acute tubular injury?
, A. Increased glomerular filtration caused by afferent arteriolar
dilation
B. Tubular epithelial cell injury with impaired sodium
reabsorption and intratubular obstruction
C. Selective destruction of the glomerular basement membrane
D. Increased erythropoietin production
Correct answer: B
Ischemia damages tubular epithelial cells, particularly in
metabolically active segments such as the proximal tubule and
thick ascending limb. Loss of tubular integrity impairs sodium
and water handling, while cellular debris can obstruct tubular
flow. Back-leak of filtrate and altered intrarenal hemodynamics
further reduce glomerular filtration.
5.
A patient with nephrotic syndrome has marked peripheral
edema and hypoalbuminemia. Which mechanism most directly
contributes to the edema?
A. Increased plasma oncotic pressure
B. Decreased capillary hydrostatic pressure
C. Reduced plasma oncotic pressure from urinary albumin loss
D. Increased lymphatic drainage
Correct answer: C
