N212 PATHOPHYSIOLOGY EXAM 3 (EASTWICK
COLLEGE) NEWEST 2026 ACTUAL EXAM| N212
PATHOPHYSIOLOGY EXAM 3 REVIEW WITH
COMPLETE REAL EXAM QUESTIONS AND CORRECT
VERIFIED ANSWERS/ ALREADY GRADED A+ (MOST
RECENT!!) — 199 Questions
Section 1: Cardiovascular System Disorders (Questions 1-20)
1 A patient with chronic hypertension develops left ventricular hypertrophy. Which of the following best explains
the transition from compensatory hypertrophy to heart failure with preserved ejection fraction (HFpEF)?
A) Increased myocardial capillary density relative to myocyte size
B) Upregulation of beta-adrenergic receptors leading to excessive chronotropy
C) Enhanced calcium reuptake by the sarcoplasmic reticulum causing diastolic dysfunction
D) Increased myocardial stiffness due to collagen deposition and impaired relaxation
Answer: D
Rationale: In chronic pressure overload, compensatory hypertrophy eventually leads to increased myocardial
stiffness from collagen deposition and impaired relaxation, resulting in diastolic dysfunction and HFpEF. Option A
is incorrect because capillary density does not increase proportionally, leading to ischemia. Option B is false;
beta-receptors are downregulated in heart failure. Option C is incorrect; calcium reuptake is impaired, not
enhanced.
2 A patient with acute coronary syndrome presents with ST-segment elevation in leads II, III, and aVF. Which
coronary artery is most likely occluded, and what complication is most specific to this territory?
A) Left anterior descending artery; ventricular septal rupture
B) Right coronary artery; right ventricular infarction and bradyarrhythmias
C) Left circumflex artery; mitral regurgitation from papillary muscle dysfunction
D) Left main coronary artery; cardiogenic shock and global ischemia
Answer: B
Rationale: ST elevation in inferior leads (II, III, aVF) indicates right coronary artery (RCA) occlusion. The RCA
supplies the right ventricle and the sinoatrial node in most individuals, so right ventricular infarction and
bradyarrhythmias (e.g., sinus bradycardia, AV block) are specific complications. Option A is associated with
anterior MI. Option C is possible but less specific; circumflex occlusion often causes lateral MI. Option D is
catastrophic but not specific to inferior MI.
3 In a patient with severe aortic stenosis, which of the following compensatory mechanisms initially maintains
cardiac output, and why does it eventually fail?
A) Increased preload via Frank-Starling mechanism; leads to pulmonary congestion
B) Left ventricular hypertrophy; causes subendocardial ischemia and diastolic dysfunction
C) Peripheral vasoconstriction via baroreflex; results in afterload mismatch
D) Tachycardia to increase cardiac output; leads to decreased coronary perfusion time
Answer: B
Rationale: Left ventricular hypertrophy (LVH) compensates for the increased afterload in aortic stenosis,
,maintaining wall stress and systolic function. However, LVH increases oxygen demand and reduces capillary
density, leading to subendocardial ischemia and impaired relaxation (diastolic dysfunction). Option A is less
effective in chronic pressure overload. Option C occurs but is secondary. Option D is not a primary compensatory
mechanism.
4 A patient with dilated cardiomyopathy has a left ventricular ejection fraction of 25%. Which of the following
laboratory findings would most likely be elevated due to chronic neurohormonal activation?
A) Renin activity, aldosterone, and norepinephrine
B) Atrial natriuretic peptide and brain natriuretic peptide
C) Cortisol and adrenocorticotropic hormone
D) Erythropoietin and renin
Answer: A
Rationale: Chronic heart failure activates the renin-angiotensin-aldosterone system (RAAS) and sympathetic
nervous system, leading to elevated renin, aldosterone, and norepinephrine. While BNP is also elevated, it is a
counter-regulatory hormone, not a primary neurohormonal activation marker. Options C and D are not directly
associated with heart failure neurohormonal activation.
5 Which of the following electrocardiographic findings is most consistent with hyperkalemia-induced cardiac
toxicity that can progress to ventricular fibrillation?
A) Prolonged PR interval and widened QRS complex with tall, peaked T waves
B) Short QT interval with prominent U waves
C) ST-segment depression with inverted T waves
D) Prolonged QT interval with torsades de pointes
Answer: A
Rationale: Hyperkalemia first causes tall, peaked T waves, then prolongs the PR interval and widens the QRS
complex, which can degenerate into ventricular fibrillation. Option B is typical of hypokalemia or
hypomagnesemia. Option C is non-specific for ischemia. Option D is associated with long QT syndrome, not
hyperkalemia.
6 A patient with chronic mitral regurgitation develops atrial fibrillation. Which of the following mechanisms best
explains the increased risk of thromboembolism in this setting?
A) Stasis of blood in the left atrium due to loss of atrial contraction and turbulent flow
B) Increased shear stress on the mitral valve leaflets causing platelet activation
C) Paradoxical embolism through a patent foramen ovale
D) Hypercoagulable state induced by elevated brain natriuretic peptide levels
Answer: A
Rationale: Atrial fibrillation leads to ineffective atrial contraction, causing blood stasis in the left atrium, especially
in the left atrial appendage. In mitral regurgitation, the regurgitant jet further disrupts flow, promoting thrombus
formation. Option B is not a primary mechanism. Option C is a potential cause of stroke but not specific to mitral
regurgitation. Option D is incorrect; BNP is not a procoagulant.
7 A patient with septic shock develops refractory hypotension despite fluid resuscitation. Which of the following
pathophysiological mechanisms primarily contributes to the decreased systemic vascular resistance?
A) Downregulation of angiotensin II receptors on vascular smooth muscle
B) Overproduction of nitric oxide via inducible nitric oxide synthase
C) Increased release of endothelin-1 from damaged endothelium
D) Adrenal insufficiency leading to cortisol deficiency
,Answer: B
Rationale: In septic shock, bacterial endotoxins and cytokines induce inducible nitric oxide synthase (iNOS) in
vascular smooth muscle, leading to massive nitric oxide production and profound vasodilation, decreasing SVR.
Option A is not a primary mechanism. Option C would cause vasoconstriction, not vasodilation. Option D may
occur but is not the primary cause of vasodilation.
8 A patient with a history of hypertension and diabetes presents with acute dyspnea, crackles in the lung bases,
and an S3 gallop. Which of the following hemodynamic profiles is most consistent with this presentation?
A) Low cardiac output, high pulmonary capillary wedge pressure, high systemic vascular resistance
B) High cardiac output, low pulmonary capillary wedge pressure, low systemic vascular resistance
C) Low cardiac output, low pulmonary capillary wedge pressure, high systemic vascular resistance
D) High cardiac output, high pulmonary capillary wedge pressure, normal systemic vascular resistance
Answer: A
Rationale: The patient has acute decompensated heart failure with pulmonary edema (crackles) and an S3 gallop,
indicating left ventricular failure and elevated filling pressures. This corresponds to a low cardiac output (due to
pump failure), high PCWP (pulmonary congestion), and high SVR (compensatory vasoconstriction). Option B
describes a high-output state (e.g., sepsis). Option C suggests hypovolemia. Option D is not typical.
9 Which of the following best describes the mechanism by which statins reduce the risk of cardiovascular events
beyond lipid lowering?
A) Inhibition of platelet cyclooxygenase, reducing thromboxane A2 production
B) Stabilization of atherosclerotic plaques by reducing inflammation and improving endothelial function
C) Direct vasodilation via increased nitric oxide bioavailability from endothelial cells
D) Reduction of fibrinogen levels and inhibition of plasminogen activator inhibitor-1
Answer: B
Rationale: Statins have pleiotropic effects including anti-inflammatory properties (reducing CRP), improving
endothelial function, and stabilizing plaques by decreasing lipid core and increasing fibrous cap thickness. Option
A describes aspirin. Option C is a secondary effect but not primary. Option D is not a well-established pleiotropic
effect.
10 A patient with a history of rheumatic heart disease presents with a holosystolic murmur at the apex radiating to
the axilla. Which valvular abnormality is most likely, and what hemodynamic consequence is expected?
A) Mitral stenosis; increased left atrial pressure and pulmonary hypertension
B) Mitral regurgitation; volume overload of the left atrium and left ventricle
C) Aortic stenosis; pressure overload of the left ventricle
D) Aortic regurgitation; volume overload of the left ventricle
Answer: B
Rationale: A holosystolic murmur at the apex radiating to the axilla is classic for mitral regurgitation. Rheumatic
heart disease commonly affects the mitral valve, causing regurgitation. This leads to volume overload of the left
atrium (during systole) and left ventricle (during diastole), eventually causing eccentric hypertrophy. Option A
would produce a diastolic murmur. Options C and D produce murmurs at the right upper sternal border.
11 A patient with chronic heart failure has a left ventricular ejection fraction of 30%. Which of the following
compensatory mechanisms is most likely to contribute to the progression of myocardial dysfunction over time?
A) Increased sympathetic nervous system activation leading to beta-receptor downregulation and desensitization
B) Enhanced renal sodium reabsorption due to reduced perfusion pressure
C) Ventricular hypertrophy that normalizes wall stress through Laplace's law
, D) Upregulation of the renin-angiotensin-aldosterone system causing pulmonary vasoconstriction
Answer: A
Rationale: Chronic sympathetic activation initially compensates for reduced cardiac output but eventually causes
beta-receptor downregulation, desensitization, and direct myocardial toxicity, worsening failure. Option B
describes a compensatory mechanism (sodium retention) that contributes to fluid overload but is not the primary
driver of myocardial dysfunction progression. Option C is an adaptive response that can become maladaptive
(hypertrophy increases oxygen demand and fibrosis). Option D is part of the neurohormonal activation but does not
directly explain progressive myocardial dysfunction.
12 In a patient with acute coronary syndrome, which of the following biomarkers is most specific for detecting
myocardial necrosis within the first 4–6 hours after symptom onset?
A) Creatine kinase-MB (CK-MB)
B) Troponin I (cTnI)
C) Myoglobin
D) Lactate dehydrogenase (LDH)
Answer: C
Rationale: Myoglobin is a small protein released rapidly from necrotic myocardium, peaking within 2–4 hours, but
it lacks cardiac specificity. Troponin I is highly specific but may not be detectable until 6–12 hours. CK-MB rises
at 4–6 hours but is less specific. LDH rises late (24–48 hours). Thus, myoglobin is the most sensitive early marker,
though confirmatory testing with troponin is required.
13 A patient presents with chest pain and ECG findings suggestive of ST-elevation myocardial infarction
(STEMI). Which of the following pathophysiological mechanisms most directly underlies the ST-segment
elevation?
A) Incomplete repolarization of ischemic myocardium due to altered sodium-potassium pump activity
B) Delayed depolarization of the infarcted zone resulting in a current of injury
C) Increased extracellular potassium concentration causing a voltage gradient between ischemic and normal
tissue
D) Accumulation of calcium in the sarcoplasmic reticulum during diastole
Answer: C
Rationale: ST elevation in STEMI results from a current of injury between ischemic and normal myocardium.
Ischemic cells lose intracellular potassium, increasing extracellular K+, which depolarizes the resting membrane
potential. This creates a voltage gradient that produces current flow during diastole, manifesting as ST elevation.
Options A and B describe related but less direct mechanisms; option D is not relevant to ST elevation.
14 Which of the following best explains why aortic stenosis leads to angina pectoris even in the absence of
coronary artery disease?
A) Increased left ventricular end-diastolic pressure compressing coronary arteries during systole
B) Decreased coronary perfusion pressure due to reduced diastolic aortic pressure
C) Myocardial oxygen demand exceeding supply due to left ventricular hypertrophy and increased wall tension
D) Embolization of calcific debris from the aortic valve into coronary arteries
Answer: C
Rationale: In aortic stenosis, left ventricular hypertrophy increases myocardial oxygen demand, while the pressure
gradient across the valve reduces coronary perfusion pressure. The imbalance causes ischemia and angina. Option
A is incorrect because coronary compression occurs in diastole, not systole. Option B is partially true but
insufficient alone. Option D is a rare complication, not the primary mechanism.
COLLEGE) NEWEST 2026 ACTUAL EXAM| N212
PATHOPHYSIOLOGY EXAM 3 REVIEW WITH
COMPLETE REAL EXAM QUESTIONS AND CORRECT
VERIFIED ANSWERS/ ALREADY GRADED A+ (MOST
RECENT!!) — 199 Questions
Section 1: Cardiovascular System Disorders (Questions 1-20)
1 A patient with chronic hypertension develops left ventricular hypertrophy. Which of the following best explains
the transition from compensatory hypertrophy to heart failure with preserved ejection fraction (HFpEF)?
A) Increased myocardial capillary density relative to myocyte size
B) Upregulation of beta-adrenergic receptors leading to excessive chronotropy
C) Enhanced calcium reuptake by the sarcoplasmic reticulum causing diastolic dysfunction
D) Increased myocardial stiffness due to collagen deposition and impaired relaxation
Answer: D
Rationale: In chronic pressure overload, compensatory hypertrophy eventually leads to increased myocardial
stiffness from collagen deposition and impaired relaxation, resulting in diastolic dysfunction and HFpEF. Option A
is incorrect because capillary density does not increase proportionally, leading to ischemia. Option B is false;
beta-receptors are downregulated in heart failure. Option C is incorrect; calcium reuptake is impaired, not
enhanced.
2 A patient with acute coronary syndrome presents with ST-segment elevation in leads II, III, and aVF. Which
coronary artery is most likely occluded, and what complication is most specific to this territory?
A) Left anterior descending artery; ventricular septal rupture
B) Right coronary artery; right ventricular infarction and bradyarrhythmias
C) Left circumflex artery; mitral regurgitation from papillary muscle dysfunction
D) Left main coronary artery; cardiogenic shock and global ischemia
Answer: B
Rationale: ST elevation in inferior leads (II, III, aVF) indicates right coronary artery (RCA) occlusion. The RCA
supplies the right ventricle and the sinoatrial node in most individuals, so right ventricular infarction and
bradyarrhythmias (e.g., sinus bradycardia, AV block) are specific complications. Option A is associated with
anterior MI. Option C is possible but less specific; circumflex occlusion often causes lateral MI. Option D is
catastrophic but not specific to inferior MI.
3 In a patient with severe aortic stenosis, which of the following compensatory mechanisms initially maintains
cardiac output, and why does it eventually fail?
A) Increased preload via Frank-Starling mechanism; leads to pulmonary congestion
B) Left ventricular hypertrophy; causes subendocardial ischemia and diastolic dysfunction
C) Peripheral vasoconstriction via baroreflex; results in afterload mismatch
D) Tachycardia to increase cardiac output; leads to decreased coronary perfusion time
Answer: B
Rationale: Left ventricular hypertrophy (LVH) compensates for the increased afterload in aortic stenosis,
,maintaining wall stress and systolic function. However, LVH increases oxygen demand and reduces capillary
density, leading to subendocardial ischemia and impaired relaxation (diastolic dysfunction). Option A is less
effective in chronic pressure overload. Option C occurs but is secondary. Option D is not a primary compensatory
mechanism.
4 A patient with dilated cardiomyopathy has a left ventricular ejection fraction of 25%. Which of the following
laboratory findings would most likely be elevated due to chronic neurohormonal activation?
A) Renin activity, aldosterone, and norepinephrine
B) Atrial natriuretic peptide and brain natriuretic peptide
C) Cortisol and adrenocorticotropic hormone
D) Erythropoietin and renin
Answer: A
Rationale: Chronic heart failure activates the renin-angiotensin-aldosterone system (RAAS) and sympathetic
nervous system, leading to elevated renin, aldosterone, and norepinephrine. While BNP is also elevated, it is a
counter-regulatory hormone, not a primary neurohormonal activation marker. Options C and D are not directly
associated with heart failure neurohormonal activation.
5 Which of the following electrocardiographic findings is most consistent with hyperkalemia-induced cardiac
toxicity that can progress to ventricular fibrillation?
A) Prolonged PR interval and widened QRS complex with tall, peaked T waves
B) Short QT interval with prominent U waves
C) ST-segment depression with inverted T waves
D) Prolonged QT interval with torsades de pointes
Answer: A
Rationale: Hyperkalemia first causes tall, peaked T waves, then prolongs the PR interval and widens the QRS
complex, which can degenerate into ventricular fibrillation. Option B is typical of hypokalemia or
hypomagnesemia. Option C is non-specific for ischemia. Option D is associated with long QT syndrome, not
hyperkalemia.
6 A patient with chronic mitral regurgitation develops atrial fibrillation. Which of the following mechanisms best
explains the increased risk of thromboembolism in this setting?
A) Stasis of blood in the left atrium due to loss of atrial contraction and turbulent flow
B) Increased shear stress on the mitral valve leaflets causing platelet activation
C) Paradoxical embolism through a patent foramen ovale
D) Hypercoagulable state induced by elevated brain natriuretic peptide levels
Answer: A
Rationale: Atrial fibrillation leads to ineffective atrial contraction, causing blood stasis in the left atrium, especially
in the left atrial appendage. In mitral regurgitation, the regurgitant jet further disrupts flow, promoting thrombus
formation. Option B is not a primary mechanism. Option C is a potential cause of stroke but not specific to mitral
regurgitation. Option D is incorrect; BNP is not a procoagulant.
7 A patient with septic shock develops refractory hypotension despite fluid resuscitation. Which of the following
pathophysiological mechanisms primarily contributes to the decreased systemic vascular resistance?
A) Downregulation of angiotensin II receptors on vascular smooth muscle
B) Overproduction of nitric oxide via inducible nitric oxide synthase
C) Increased release of endothelin-1 from damaged endothelium
D) Adrenal insufficiency leading to cortisol deficiency
,Answer: B
Rationale: In septic shock, bacterial endotoxins and cytokines induce inducible nitric oxide synthase (iNOS) in
vascular smooth muscle, leading to massive nitric oxide production and profound vasodilation, decreasing SVR.
Option A is not a primary mechanism. Option C would cause vasoconstriction, not vasodilation. Option D may
occur but is not the primary cause of vasodilation.
8 A patient with a history of hypertension and diabetes presents with acute dyspnea, crackles in the lung bases,
and an S3 gallop. Which of the following hemodynamic profiles is most consistent with this presentation?
A) Low cardiac output, high pulmonary capillary wedge pressure, high systemic vascular resistance
B) High cardiac output, low pulmonary capillary wedge pressure, low systemic vascular resistance
C) Low cardiac output, low pulmonary capillary wedge pressure, high systemic vascular resistance
D) High cardiac output, high pulmonary capillary wedge pressure, normal systemic vascular resistance
Answer: A
Rationale: The patient has acute decompensated heart failure with pulmonary edema (crackles) and an S3 gallop,
indicating left ventricular failure and elevated filling pressures. This corresponds to a low cardiac output (due to
pump failure), high PCWP (pulmonary congestion), and high SVR (compensatory vasoconstriction). Option B
describes a high-output state (e.g., sepsis). Option C suggests hypovolemia. Option D is not typical.
9 Which of the following best describes the mechanism by which statins reduce the risk of cardiovascular events
beyond lipid lowering?
A) Inhibition of platelet cyclooxygenase, reducing thromboxane A2 production
B) Stabilization of atherosclerotic plaques by reducing inflammation and improving endothelial function
C) Direct vasodilation via increased nitric oxide bioavailability from endothelial cells
D) Reduction of fibrinogen levels and inhibition of plasminogen activator inhibitor-1
Answer: B
Rationale: Statins have pleiotropic effects including anti-inflammatory properties (reducing CRP), improving
endothelial function, and stabilizing plaques by decreasing lipid core and increasing fibrous cap thickness. Option
A describes aspirin. Option C is a secondary effect but not primary. Option D is not a well-established pleiotropic
effect.
10 A patient with a history of rheumatic heart disease presents with a holosystolic murmur at the apex radiating to
the axilla. Which valvular abnormality is most likely, and what hemodynamic consequence is expected?
A) Mitral stenosis; increased left atrial pressure and pulmonary hypertension
B) Mitral regurgitation; volume overload of the left atrium and left ventricle
C) Aortic stenosis; pressure overload of the left ventricle
D) Aortic regurgitation; volume overload of the left ventricle
Answer: B
Rationale: A holosystolic murmur at the apex radiating to the axilla is classic for mitral regurgitation. Rheumatic
heart disease commonly affects the mitral valve, causing regurgitation. This leads to volume overload of the left
atrium (during systole) and left ventricle (during diastole), eventually causing eccentric hypertrophy. Option A
would produce a diastolic murmur. Options C and D produce murmurs at the right upper sternal border.
11 A patient with chronic heart failure has a left ventricular ejection fraction of 30%. Which of the following
compensatory mechanisms is most likely to contribute to the progression of myocardial dysfunction over time?
A) Increased sympathetic nervous system activation leading to beta-receptor downregulation and desensitization
B) Enhanced renal sodium reabsorption due to reduced perfusion pressure
C) Ventricular hypertrophy that normalizes wall stress through Laplace's law
, D) Upregulation of the renin-angiotensin-aldosterone system causing pulmonary vasoconstriction
Answer: A
Rationale: Chronic sympathetic activation initially compensates for reduced cardiac output but eventually causes
beta-receptor downregulation, desensitization, and direct myocardial toxicity, worsening failure. Option B
describes a compensatory mechanism (sodium retention) that contributes to fluid overload but is not the primary
driver of myocardial dysfunction progression. Option C is an adaptive response that can become maladaptive
(hypertrophy increases oxygen demand and fibrosis). Option D is part of the neurohormonal activation but does not
directly explain progressive myocardial dysfunction.
12 In a patient with acute coronary syndrome, which of the following biomarkers is most specific for detecting
myocardial necrosis within the first 4–6 hours after symptom onset?
A) Creatine kinase-MB (CK-MB)
B) Troponin I (cTnI)
C) Myoglobin
D) Lactate dehydrogenase (LDH)
Answer: C
Rationale: Myoglobin is a small protein released rapidly from necrotic myocardium, peaking within 2–4 hours, but
it lacks cardiac specificity. Troponin I is highly specific but may not be detectable until 6–12 hours. CK-MB rises
at 4–6 hours but is less specific. LDH rises late (24–48 hours). Thus, myoglobin is the most sensitive early marker,
though confirmatory testing with troponin is required.
13 A patient presents with chest pain and ECG findings suggestive of ST-elevation myocardial infarction
(STEMI). Which of the following pathophysiological mechanisms most directly underlies the ST-segment
elevation?
A) Incomplete repolarization of ischemic myocardium due to altered sodium-potassium pump activity
B) Delayed depolarization of the infarcted zone resulting in a current of injury
C) Increased extracellular potassium concentration causing a voltage gradient between ischemic and normal
tissue
D) Accumulation of calcium in the sarcoplasmic reticulum during diastole
Answer: C
Rationale: ST elevation in STEMI results from a current of injury between ischemic and normal myocardium.
Ischemic cells lose intracellular potassium, increasing extracellular K+, which depolarizes the resting membrane
potential. This creates a voltage gradient that produces current flow during diastole, manifesting as ST elevation.
Options A and B describe related but less direct mechanisms; option D is not relevant to ST elevation.
14 Which of the following best explains why aortic stenosis leads to angina pectoris even in the absence of
coronary artery disease?
A) Increased left ventricular end-diastolic pressure compressing coronary arteries during systole
B) Decreased coronary perfusion pressure due to reduced diastolic aortic pressure
C) Myocardial oxygen demand exceeding supply due to left ventricular hypertrophy and increased wall tension
D) Embolization of calcific debris from the aortic valve into coronary arteries
Answer: C
Rationale: In aortic stenosis, left ventricular hypertrophy increases myocardial oxygen demand, while the pressure
gradient across the valve reduces coronary perfusion pressure. The imbalance causes ischemia and angina. Option
A is incorrect because coronary compression occurs in diastole, not systole. Option B is partially true but
insufficient alone. Option D is a rare complication, not the primary mechanism.
