1
NR 507 Midterm Exam Actual Exam 2026/2027 |
NR507 Advanced Pathophysiology Cardiac,
Pulmonary, Hematology, Renal Complete Test
Bank with Verified Q&A | Chamberlain
University | A+ Graded
SECTION 1: CARDIOVASCULAR PATHOPHYSIOLOGY (Questions 1-25)
Q1: A 65-year-old male with a history of hypertension presents with acute onset of severe,
crushing substernal chest pain radiating to his left arm, associated with diaphoresis and nausea.
ECG reveals ST-segment elevations in leads V1-V4. Which of the following pathophysiological
processes is most likely occurring?
A. Stable atherosclerotic plaque with progressive lumen narrowing
B. Rupture of an unstable plaque with thrombus formation causing complete coronary occlusion.
[CORRECT]
C. Coronary artery vasospasm without plaque rupture
D. Microvascular dysfunction with reduced coronary flow reserve
Correct Answer: B
Rationale: ST-segment elevation MI (STEMI) typically results from rupture or erosion of an
unstable atherosclerotic plaque, exposing thrombogenic material and leading to complete
thrombotic occlusion of a coronary artery. The ST elevations in V1-V4 indicate anterior wall
involvement. Stable plaque with progressive narrowing causes stable angina, vasospasm causes
variant angina, and microvascular dysfunction is associated with cardiac syndrome X.
Q2: A 58-year-old female with chronic hypertension is found to have left ventricular hypertrophy
on echocardiogram. Which compensatory mechanism primarily explains this structural
adaptation?
A. Activation of the renin-angiotensin-aldosterone system leading to vasodilation
B. Increased wall stress triggering myocyte hypertrophy and interstitial fibrosis. [CORRECT]
C. Enhanced parasympathetic tone reducing heart rate
D. Increased nitric oxide production causing arterial remodeling
,2
Correct Answer: B
Rationale: Chronic pressure overload in hypertension increases ventricular wall stress
(afterload), triggering myocyte hypertrophy and interstitial fibrosis as compensatory mechanisms
to normalize wall tension according to Laplace's law. While RAAS activation occurs, it promotes
vasoconstriction and remodeling, not vasodilation. Parasympathetic changes and nitric oxide do
not primarily drive hypertrophy.
Q3: A 72-year-old male with a history of myocardial infarction 3 months ago presents with
progressive dyspnea, orthopnea, and bilateral lower extremity edema. Echocardiogram reveals an
ejection fraction of 25% with dilated left ventricle. Which pathophysiological process best
explains his current presentation?
A. Diastolic dysfunction with preserved ejection fraction
B. Systolic heart failure due to ventricular remodeling and contractile dysfunction. [CORRECT]
C. Constrictive pericarditis limiting ventricular filling
D. Hypertrophic cardiomyopathy with outflow obstruction
Correct Answer: B
Rationale: Post-MI systolic heart failure (HFrEF) develops from ventricular remodeling,
including myocyte loss, scar formation, and progressive dilation with reduced contractility. The
low EF (25%) and dilation confirm systolic dysfunction. Diastolic failure (HFpEF) preserves EF.
Constrictive pericarditis and hypertrophic cardiomyopathy present differently with preserved or
hyperdynamic function.
Q4: A 45-year-old male with familial hypercholesterolemia develops early atherosclerotic
lesions. Which sequence correctly describes the progression from initial endothelial injury to
complicated plaque?
A. Fatty streak → fibrous plaque → complicated lesion with thrombosis. [CORRECT]
B. Fibrous plaque → fatty streak → complicated lesion with calcification
C. Complicated lesion → fatty streak → fibrous plaque
D. Fatty streak → complicated lesion → fibrous plaque
Correct Answer: A
Rationale: Atherosclerosis progresses through stages: (1) endothelial dysfunction and lipid
accumulation forming fatty streaks; (2) smooth muscle migration, collagen deposition, and
necrotic core development creating fibrous plaques; (3) plaque rupture, hemorrhage, thrombosis,
and calcification producing complicated lesions. This sequence reflects chronic inflammatory
and reparative processes.
, 3
Q5: A patient with chronic heart failure demonstrates increased heart rate, peripheral
vasoconstriction, and sodium/water retention. Which neurohormonal activation primarily drives
these compensatory responses?
A. Increased atrial natriuretic peptide release
B. Sympathetic nervous system and renin-angiotensin-aldosterone system activation.
[CORRECT]
C. Enhanced parasympathetic tone and bradykinin release
D. Suppression of antidiuretic hormone secretion
Correct Answer: B
Rationale: Reduced cardiac output activates baroreceptors, triggering sympathetic nervous
system (tachycardia, vasoconstriction) and RAAS activation (aldosterone-mediated
sodium/water retention). While initially compensatory, chronic activation causes maladaptive
remodeling. ANP opposes these effects, and ADH typically increases, not decreases, in heart
failure.
Q6: A 68-year-old female presents with exertional dyspnea, orthopnea, and a holosystolic
murmur radiating to the axilla. Echocardiogram shows left atrial enlargement and systolic flow
reversal in pulmonary veins. Which valvular disorder is most likely present?
A. Aortic stenosis
B. Mitral regurgitation. [CORRECT]
C. Tricuspid stenosis
D. Pulmonary regurgitation
Correct Answer: B
Rationale: The holosystolic murmur radiating to the axilla, combined with left atrial
enlargement and pulmonary venous flow reversal, is pathognomonic for mitral regurgitation.
Systolic backflow into the left atrium increases pulmonary pressures causing dyspnea. Aortic
stenosis produces a crescendo-decrescendo systolic murmur; tricuspid and pulmonary lesions
produce different murmur characteristics and hemodynamic patterns.
Q7: A patient with dilated cardiomyopathy develops ventricular tachycardia. Which cellular
mechanism most likely contributes to this arrhythmia in the setting of structural heart disease?
A. Enhanced normal automaticity of sinoatrial node cells
B. Reentry circuits formed around areas of fibrosis and scarring. [CORRECT]
C. Decreased sympathetic tone reducing repolarization heterogeneity
D. Shortened action potential duration uniformly throughout myocardium
NR 507 Midterm Exam Actual Exam 2026/2027 |
NR507 Advanced Pathophysiology Cardiac,
Pulmonary, Hematology, Renal Complete Test
Bank with Verified Q&A | Chamberlain
University | A+ Graded
SECTION 1: CARDIOVASCULAR PATHOPHYSIOLOGY (Questions 1-25)
Q1: A 65-year-old male with a history of hypertension presents with acute onset of severe,
crushing substernal chest pain radiating to his left arm, associated with diaphoresis and nausea.
ECG reveals ST-segment elevations in leads V1-V4. Which of the following pathophysiological
processes is most likely occurring?
A. Stable atherosclerotic plaque with progressive lumen narrowing
B. Rupture of an unstable plaque with thrombus formation causing complete coronary occlusion.
[CORRECT]
C. Coronary artery vasospasm without plaque rupture
D. Microvascular dysfunction with reduced coronary flow reserve
Correct Answer: B
Rationale: ST-segment elevation MI (STEMI) typically results from rupture or erosion of an
unstable atherosclerotic plaque, exposing thrombogenic material and leading to complete
thrombotic occlusion of a coronary artery. The ST elevations in V1-V4 indicate anterior wall
involvement. Stable plaque with progressive narrowing causes stable angina, vasospasm causes
variant angina, and microvascular dysfunction is associated with cardiac syndrome X.
Q2: A 58-year-old female with chronic hypertension is found to have left ventricular hypertrophy
on echocardiogram. Which compensatory mechanism primarily explains this structural
adaptation?
A. Activation of the renin-angiotensin-aldosterone system leading to vasodilation
B. Increased wall stress triggering myocyte hypertrophy and interstitial fibrosis. [CORRECT]
C. Enhanced parasympathetic tone reducing heart rate
D. Increased nitric oxide production causing arterial remodeling
,2
Correct Answer: B
Rationale: Chronic pressure overload in hypertension increases ventricular wall stress
(afterload), triggering myocyte hypertrophy and interstitial fibrosis as compensatory mechanisms
to normalize wall tension according to Laplace's law. While RAAS activation occurs, it promotes
vasoconstriction and remodeling, not vasodilation. Parasympathetic changes and nitric oxide do
not primarily drive hypertrophy.
Q3: A 72-year-old male with a history of myocardial infarction 3 months ago presents with
progressive dyspnea, orthopnea, and bilateral lower extremity edema. Echocardiogram reveals an
ejection fraction of 25% with dilated left ventricle. Which pathophysiological process best
explains his current presentation?
A. Diastolic dysfunction with preserved ejection fraction
B. Systolic heart failure due to ventricular remodeling and contractile dysfunction. [CORRECT]
C. Constrictive pericarditis limiting ventricular filling
D. Hypertrophic cardiomyopathy with outflow obstruction
Correct Answer: B
Rationale: Post-MI systolic heart failure (HFrEF) develops from ventricular remodeling,
including myocyte loss, scar formation, and progressive dilation with reduced contractility. The
low EF (25%) and dilation confirm systolic dysfunction. Diastolic failure (HFpEF) preserves EF.
Constrictive pericarditis and hypertrophic cardiomyopathy present differently with preserved or
hyperdynamic function.
Q4: A 45-year-old male with familial hypercholesterolemia develops early atherosclerotic
lesions. Which sequence correctly describes the progression from initial endothelial injury to
complicated plaque?
A. Fatty streak → fibrous plaque → complicated lesion with thrombosis. [CORRECT]
B. Fibrous plaque → fatty streak → complicated lesion with calcification
C. Complicated lesion → fatty streak → fibrous plaque
D. Fatty streak → complicated lesion → fibrous plaque
Correct Answer: A
Rationale: Atherosclerosis progresses through stages: (1) endothelial dysfunction and lipid
accumulation forming fatty streaks; (2) smooth muscle migration, collagen deposition, and
necrotic core development creating fibrous plaques; (3) plaque rupture, hemorrhage, thrombosis,
and calcification producing complicated lesions. This sequence reflects chronic inflammatory
and reparative processes.
, 3
Q5: A patient with chronic heart failure demonstrates increased heart rate, peripheral
vasoconstriction, and sodium/water retention. Which neurohormonal activation primarily drives
these compensatory responses?
A. Increased atrial natriuretic peptide release
B. Sympathetic nervous system and renin-angiotensin-aldosterone system activation.
[CORRECT]
C. Enhanced parasympathetic tone and bradykinin release
D. Suppression of antidiuretic hormone secretion
Correct Answer: B
Rationale: Reduced cardiac output activates baroreceptors, triggering sympathetic nervous
system (tachycardia, vasoconstriction) and RAAS activation (aldosterone-mediated
sodium/water retention). While initially compensatory, chronic activation causes maladaptive
remodeling. ANP opposes these effects, and ADH typically increases, not decreases, in heart
failure.
Q6: A 68-year-old female presents with exertional dyspnea, orthopnea, and a holosystolic
murmur radiating to the axilla. Echocardiogram shows left atrial enlargement and systolic flow
reversal in pulmonary veins. Which valvular disorder is most likely present?
A. Aortic stenosis
B. Mitral regurgitation. [CORRECT]
C. Tricuspid stenosis
D. Pulmonary regurgitation
Correct Answer: B
Rationale: The holosystolic murmur radiating to the axilla, combined with left atrial
enlargement and pulmonary venous flow reversal, is pathognomonic for mitral regurgitation.
Systolic backflow into the left atrium increases pulmonary pressures causing dyspnea. Aortic
stenosis produces a crescendo-decrescendo systolic murmur; tricuspid and pulmonary lesions
produce different murmur characteristics and hemodynamic patterns.
Q7: A patient with dilated cardiomyopathy develops ventricular tachycardia. Which cellular
mechanism most likely contributes to this arrhythmia in the setting of structural heart disease?
A. Enhanced normal automaticity of sinoatrial node cells
B. Reentry circuits formed around areas of fibrosis and scarring. [CORRECT]
C. Decreased sympathetic tone reducing repolarization heterogeneity
D. Shortened action potential duration uniformly throughout myocardium
