, Question 1
A cell exposed to prolonged hypoxia exhibits decreased ATP, increased
cytosolic Ca², and mitochondrial permeability transition pore opening. Which
downstream event most directly commits this cell to irreversible injury?
A. Activation of caspases-8 and -10 via death receptor signaling
B. Calpain-mediated cytoskeletal degradation and membrane
phospholipid loss
C. Rapid restoration of oxidative phosphorylation upon reperfusion
D. Upregulation of HSP70 chaperone activity
Correct Answer: B - Calpain-mediated cytoskeletal degradation
and membrane phospholipid loss
RATIONALE
Irreversible injury is marked by severe membrane damage from
calpain activation and phospholipase-mediated lipid degradation,
which cannot be reversed even if oxygen is restored. Caspase-8/10
activation indicates extrinsic apoptosis, not necrotic commitment;
reperfusion can paradoxically worsen injury; HSP70 is cytoprotective,
not a commitment step.
Question 2
In a patient with sepsis, which cytokine pattern best characterizes the transition
from the initial pro-inflammatory phase to the compensatory anti-inflammatory
response syndrome (CARS)?
A. Persistently elevated TNF- with undetectable IL-10
B. Predominance of IL-1 and IL-6 with suppressed TGF-
C. Elevated IL-10 and TGF- with reduced HLA-DR expression on
monocytes
D. Increased IFN- with enhanced macrophage phagocytosis
Correct Answer: C - Elevated IL-10 and TGF- with reduced
HLA-DR expression on monocytes
Page 2
, RATIONALE
CARS is defined by a shift toward anti-inflammatory mediators
(IL-10, TGF-) and monocyte deactivation (reduced HLA-DR), leading
to immunoparalysis. Options A, B, and D describe persistent or
enhanced pro-inflammatory states inconsistent with CARS.
Question 3
Which hemodynamic profile is most consistent with cardiogenic shock due to
acute myocardial infarction?
A. Cardiac index 1.8 L/min/m², PCWP 28 mmHg, SVR 1800 dynes-s/cm
B. Cardiac index 4.2 L/min/m², PCWP 8 mmHg, SVR 600 dynes-s/cm
C. Cardiac index 2.5 L/min/m², PCWP 12 mmHg, SVR 900 dynes-s/cm
D. Cardiac index 3.0 L/min/m², PCWP 15 mmHg, SVR 1100 dynes-s/cm
Correct Answer: A - Cardiac index 1.8 L/min/m², PCWP 28
mmHg, SVR 1800 dynes-s/cm
RATIONALE
Cardiogenic shock features low cardiac index (<2.2), elevated PCWP
(>18), and compensatory high SVR. Option B describes distributive
shock; C and D represent normal or near-normal profiles.
Question 4
A patient with nephrotic syndrome develops a thrombotic event. Which
pathophysiologic alteration most directly contributes to this hypercoagulable
state?
A. Increased urinary loss of antithrombin III
B. Enhanced hepatic synthesis of protein C
C. Elevated plasma fibrinogen secondary to inflammation
D. Decreased platelet activation due to hypoalbuminemia
Correct Answer: A - Increased urinary loss of antithrombin III
Page 3
, RATIONALE
Nephrotic syndrome causes urinary loss of antithrombin III, a key
anticoagulant, leading to a prothrombotic state. Protein C is not
increased; fibrinogen may rise but is less directly linked;
hypoalbuminemia does not decrease platelet activation.
Question 5
Which statement best distinguishes type I from type II diabetes mellitus at the
pathophysiologic level?
A. Type I involves insulin resistance, while type II is purely autoimmune.
B. Type I results from absolute insulin deficiency due to -cell destruction,
while type II involves relative deficiency and insulin resistance.
C. Type I is characterized by amylin overproduction, while type II
features glucagon deficiency.
D. Type I typically presents with hyperinsulinemia, while type II presents
with hypoinsulinemia.
Correct Answer: B - Type I results from absolute insulin
deficiency due to -cell destruction, while type II involves relative
deficiency and insulin resistance.
RATIONALE
Type I diabetes is caused by autoimmune destruction of pancreatic
-cells leading to absolute insulin deficiency. Type II involves insulin
resistance and progressive -cell dysfunction, not autoimmunity.
Question 6
A patient with chronic kidney disease has an eGFR of 25 mL/min/1.73m².
Which compensatory mechanism initially maintains acid-base balance but
eventually contributes to bone disease?
A. Increased renal ammonia genesis and bicarbonate reabsorption
B. Hyperventilation-induced respiratory alkalosis
Page 4
A cell exposed to prolonged hypoxia exhibits decreased ATP, increased
cytosolic Ca², and mitochondrial permeability transition pore opening. Which
downstream event most directly commits this cell to irreversible injury?
A. Activation of caspases-8 and -10 via death receptor signaling
B. Calpain-mediated cytoskeletal degradation and membrane
phospholipid loss
C. Rapid restoration of oxidative phosphorylation upon reperfusion
D. Upregulation of HSP70 chaperone activity
Correct Answer: B - Calpain-mediated cytoskeletal degradation
and membrane phospholipid loss
RATIONALE
Irreversible injury is marked by severe membrane damage from
calpain activation and phospholipase-mediated lipid degradation,
which cannot be reversed even if oxygen is restored. Caspase-8/10
activation indicates extrinsic apoptosis, not necrotic commitment;
reperfusion can paradoxically worsen injury; HSP70 is cytoprotective,
not a commitment step.
Question 2
In a patient with sepsis, which cytokine pattern best characterizes the transition
from the initial pro-inflammatory phase to the compensatory anti-inflammatory
response syndrome (CARS)?
A. Persistently elevated TNF- with undetectable IL-10
B. Predominance of IL-1 and IL-6 with suppressed TGF-
C. Elevated IL-10 and TGF- with reduced HLA-DR expression on
monocytes
D. Increased IFN- with enhanced macrophage phagocytosis
Correct Answer: C - Elevated IL-10 and TGF- with reduced
HLA-DR expression on monocytes
Page 2
, RATIONALE
CARS is defined by a shift toward anti-inflammatory mediators
(IL-10, TGF-) and monocyte deactivation (reduced HLA-DR), leading
to immunoparalysis. Options A, B, and D describe persistent or
enhanced pro-inflammatory states inconsistent with CARS.
Question 3
Which hemodynamic profile is most consistent with cardiogenic shock due to
acute myocardial infarction?
A. Cardiac index 1.8 L/min/m², PCWP 28 mmHg, SVR 1800 dynes-s/cm
B. Cardiac index 4.2 L/min/m², PCWP 8 mmHg, SVR 600 dynes-s/cm
C. Cardiac index 2.5 L/min/m², PCWP 12 mmHg, SVR 900 dynes-s/cm
D. Cardiac index 3.0 L/min/m², PCWP 15 mmHg, SVR 1100 dynes-s/cm
Correct Answer: A - Cardiac index 1.8 L/min/m², PCWP 28
mmHg, SVR 1800 dynes-s/cm
RATIONALE
Cardiogenic shock features low cardiac index (<2.2), elevated PCWP
(>18), and compensatory high SVR. Option B describes distributive
shock; C and D represent normal or near-normal profiles.
Question 4
A patient with nephrotic syndrome develops a thrombotic event. Which
pathophysiologic alteration most directly contributes to this hypercoagulable
state?
A. Increased urinary loss of antithrombin III
B. Enhanced hepatic synthesis of protein C
C. Elevated plasma fibrinogen secondary to inflammation
D. Decreased platelet activation due to hypoalbuminemia
Correct Answer: A - Increased urinary loss of antithrombin III
Page 3
, RATIONALE
Nephrotic syndrome causes urinary loss of antithrombin III, a key
anticoagulant, leading to a prothrombotic state. Protein C is not
increased; fibrinogen may rise but is less directly linked;
hypoalbuminemia does not decrease platelet activation.
Question 5
Which statement best distinguishes type I from type II diabetes mellitus at the
pathophysiologic level?
A. Type I involves insulin resistance, while type II is purely autoimmune.
B. Type I results from absolute insulin deficiency due to -cell destruction,
while type II involves relative deficiency and insulin resistance.
C. Type I is characterized by amylin overproduction, while type II
features glucagon deficiency.
D. Type I typically presents with hyperinsulinemia, while type II presents
with hypoinsulinemia.
Correct Answer: B - Type I results from absolute insulin
deficiency due to -cell destruction, while type II involves relative
deficiency and insulin resistance.
RATIONALE
Type I diabetes is caused by autoimmune destruction of pancreatic
-cells leading to absolute insulin deficiency. Type II involves insulin
resistance and progressive -cell dysfunction, not autoimmunity.
Question 6
A patient with chronic kidney disease has an eGFR of 25 mL/min/1.73m².
Which compensatory mechanism initially maintains acid-base balance but
eventually contributes to bone disease?
A. Increased renal ammonia genesis and bicarbonate reabsorption
B. Hyperventilation-induced respiratory alkalosis
Page 4
