Pathophysiology & Clinical Exam
Practice: Case Studies
Q&A||Questions And Answers With
Rationales/Graded A+/2026
Update/100% Correct /Instant
Download
80+ Questions for 2026 Student Assessment
Instructions: Each question presents a clinical vignette followed by multiple-
choice options. Select the best answer. Correct answers are highlighted in bold.
Rationales are provided after each question.
Section 1: Cardiovascular Pathophysiology (Questions 1–12)
1. A 58-year-old male with hypertension presents with sudden onset of severe,
tearing chest pain radiating to the back. BP is 160/100 in right arm, 90/60 in
left arm. What is the most likely pathophysiological event?
A) Plaque rupture with thrombus
B) Dissection of the aortic media – Rationale: Intimal tear allows blood to enter
media, creating a false lumen. Differential BP in arms suggests subclavian artery
involvement.
C) Vasospasm of coronary artery
D) Myocardial wall rupture
2. A 72-year-old with chronic heart failure presents with worsening dyspnea,
jugular venous distension, and peripheral edema. Which compensatory
mechanism is most maladaptive long-term?
A) Increased sympathetic tone
B) RAAS activation – Rationale: RAAS causes sodium/water retention, increasing
preload and afterload, worsening failure.
,C) Frank-Starling mechanism
D) Myocardial hypertrophy
3. A 45-year-old woman has palpitations, fatigue, and weight loss. ECG shows
irregularly irregular rhythm with no P waves. What is the most likely
underlying pathophysiology?
A) Re-entry circuit in AV node
B) Multiple re-entrant wavelets in atria – Rationale: Atrial fibrillation results
from chaotic atrial activation. Loss of P waves and irregularly irregular rhythm
are classic.
C) Enhanced automaticity in Purkinje fibers
D) AV block at the bundle of His
4. A 60-year-old with STEMI develops a new harsh holosystolic murmur at the
apex radiating to the axilla 3 days post-MI. Which mechanism is most likely?
A) Papillary muscle rupture – Rationale: Posterior MI can cause papillary muscle
rupture → acute mitral regurgitation → apical holosystolic murmur.
B) Ventricular septal defect
C) Left ventricular aneurysm
D) Pericardial friction rub
5. A patient with long-standing hypertension has left ventricular hypertrophy
on echo. Which cellular change best explains this finding?
A) Increased sarcomere addition in parallel – Rationale: Pressure overload
causes concentric hypertrophy via parallel sarcomere addition, increasing wall
thickness.
B) Increased sarcomere addition in series
C) Myocyte apoptosis
D) Fibroblast proliferation only
6. A 68-year-old with chest pain on exertion relieved by rest. Stress test shows
ST-segment depression. What is the primary pathophysiologic mechanism?
A) Fixed coronary artery stenosis limiting flow reserve – Rationale: Stable
angina results from fixed obstruction. Increased demand (exercise) causes supply-
demand mismatch.
B) Transient platelet aggregation
C) Coronary artery vasospasm
D) Microembolization
, 7. A 55-year-old presents with acute severe chest pain, dyspnea, and
hypotension. ECG shows ST elevation in V1–V4. Troponin is elevated. Which
complication is most likely if untreated within 90 minutes?
A) Left ventricular remodeling – Rationale: Prolonged ischemia causes myocyte
necrosis, leading to infarct expansion, thinning, and chronic heart failure.
B) Aortic stenosis
C) Pulmonary embolism
D) Hypertrophic cardiomyopathy
8. A 30-year-old with fever and new murmur. Blood cultures positive for
Streptococcus viridans. Which valve lesion is most characteristic?
A) Calcific nodules
B) Vegetations on valve closure line – Rationale: Infective endocarditis causes
friable vegetations composed of fibrin, platelets, and organisms, typically at valve
closure lines.
C) Commissural fusion
D) Valve thickening without vegetation
9. A 70-year-old with syncope on exertion. Harsh crescendo-decrescendo
murmur at right upper sternal border radiating to carotids. Pathophysiology?
A) Calcific degeneration of trileaflet valve – Rationale: Senile calcific aortic
stenosis is most common in elderly; obstruction to LV outflow causes syncope with
exertion.
B) Mitral annular calcification
C) Infective endocarditis
D) Rheumatic fever
10. A 50-year-old with acute pulmonary edema. BP 200/110, HR 110. No
murmurs. Which is the most likely trigger?
A) Acute afterload mismatch from hypertensive crisis – Rationale: Severe
hypertension increases LV afterload, causing acute heart failure and pulmonary
edema without primary valve disease.
B) Acute mitral regurgitation
C) Acute aortic regurgitation
D) Cardiac tamponade
11. A 65-year-old with chronic HFrEF (EF 30%) on ACE inhibitor, beta-
blocker, and loop diuretic. Which pathophysiologic change would most likely
worsen if these medications are stopped?
Practice: Case Studies
Q&A||Questions And Answers With
Rationales/Graded A+/2026
Update/100% Correct /Instant
Download
80+ Questions for 2026 Student Assessment
Instructions: Each question presents a clinical vignette followed by multiple-
choice options. Select the best answer. Correct answers are highlighted in bold.
Rationales are provided after each question.
Section 1: Cardiovascular Pathophysiology (Questions 1–12)
1. A 58-year-old male with hypertension presents with sudden onset of severe,
tearing chest pain radiating to the back. BP is 160/100 in right arm, 90/60 in
left arm. What is the most likely pathophysiological event?
A) Plaque rupture with thrombus
B) Dissection of the aortic media – Rationale: Intimal tear allows blood to enter
media, creating a false lumen. Differential BP in arms suggests subclavian artery
involvement.
C) Vasospasm of coronary artery
D) Myocardial wall rupture
2. A 72-year-old with chronic heart failure presents with worsening dyspnea,
jugular venous distension, and peripheral edema. Which compensatory
mechanism is most maladaptive long-term?
A) Increased sympathetic tone
B) RAAS activation – Rationale: RAAS causes sodium/water retention, increasing
preload and afterload, worsening failure.
,C) Frank-Starling mechanism
D) Myocardial hypertrophy
3. A 45-year-old woman has palpitations, fatigue, and weight loss. ECG shows
irregularly irregular rhythm with no P waves. What is the most likely
underlying pathophysiology?
A) Re-entry circuit in AV node
B) Multiple re-entrant wavelets in atria – Rationale: Atrial fibrillation results
from chaotic atrial activation. Loss of P waves and irregularly irregular rhythm
are classic.
C) Enhanced automaticity in Purkinje fibers
D) AV block at the bundle of His
4. A 60-year-old with STEMI develops a new harsh holosystolic murmur at the
apex radiating to the axilla 3 days post-MI. Which mechanism is most likely?
A) Papillary muscle rupture – Rationale: Posterior MI can cause papillary muscle
rupture → acute mitral regurgitation → apical holosystolic murmur.
B) Ventricular septal defect
C) Left ventricular aneurysm
D) Pericardial friction rub
5. A patient with long-standing hypertension has left ventricular hypertrophy
on echo. Which cellular change best explains this finding?
A) Increased sarcomere addition in parallel – Rationale: Pressure overload
causes concentric hypertrophy via parallel sarcomere addition, increasing wall
thickness.
B) Increased sarcomere addition in series
C) Myocyte apoptosis
D) Fibroblast proliferation only
6. A 68-year-old with chest pain on exertion relieved by rest. Stress test shows
ST-segment depression. What is the primary pathophysiologic mechanism?
A) Fixed coronary artery stenosis limiting flow reserve – Rationale: Stable
angina results from fixed obstruction. Increased demand (exercise) causes supply-
demand mismatch.
B) Transient platelet aggregation
C) Coronary artery vasospasm
D) Microembolization
, 7. A 55-year-old presents with acute severe chest pain, dyspnea, and
hypotension. ECG shows ST elevation in V1–V4. Troponin is elevated. Which
complication is most likely if untreated within 90 minutes?
A) Left ventricular remodeling – Rationale: Prolonged ischemia causes myocyte
necrosis, leading to infarct expansion, thinning, and chronic heart failure.
B) Aortic stenosis
C) Pulmonary embolism
D) Hypertrophic cardiomyopathy
8. A 30-year-old with fever and new murmur. Blood cultures positive for
Streptococcus viridans. Which valve lesion is most characteristic?
A) Calcific nodules
B) Vegetations on valve closure line – Rationale: Infective endocarditis causes
friable vegetations composed of fibrin, platelets, and organisms, typically at valve
closure lines.
C) Commissural fusion
D) Valve thickening without vegetation
9. A 70-year-old with syncope on exertion. Harsh crescendo-decrescendo
murmur at right upper sternal border radiating to carotids. Pathophysiology?
A) Calcific degeneration of trileaflet valve – Rationale: Senile calcific aortic
stenosis is most common in elderly; obstruction to LV outflow causes syncope with
exertion.
B) Mitral annular calcification
C) Infective endocarditis
D) Rheumatic fever
10. A 50-year-old with acute pulmonary edema. BP 200/110, HR 110. No
murmurs. Which is the most likely trigger?
A) Acute afterload mismatch from hypertensive crisis – Rationale: Severe
hypertension increases LV afterload, causing acute heart failure and pulmonary
edema without primary valve disease.
B) Acute mitral regurgitation
C) Acute aortic regurgitation
D) Cardiac tamponade
11. A 65-year-old with chronic HFrEF (EF 30%) on ACE inhibitor, beta-
blocker, and loop diuretic. Which pathophysiologic change would most likely
worsen if these medications are stopped?
