Heart Failure Case Study JoAnn Smith 72 Years Old Actual
Exam 2026/2027 – Complete Exam-Style Questions with
Detailed Rationales | 100% Verified | Pass Guaranteed – A+
Graded
Case Snapshot: JoAnn Smith is a 72-year-old female admitted to the medical-surgical
unit with a 3-day history of worsening shortness of breath, orthopnea, fatigue, and a 5-lb
weight gain. She has a history of hypertension, type 2 diabetes, and myocardial
infarction (5 years ago). Home medications include lisinopril, metoprolol, furosemide,
and metformin. Vital signs: BP 152/94 mmHg, HR 102 (irregularly irregular), RR 28, SpO₂
89% on room air, T 37.1°C. Physical exam reveals bilateral crackles to mid-lung fields, +2
pitting edema of the lower extremities, jugular venous distention, and an S3 gallop. BNP:
1,450 pg/mL. Chest x-ray shows cardiomegaly and pulmonary congestion.
Echocardiogram: LVEF 30%. ECG: atrial fibrillation.
Section A: Heart Failure Pathophysiology & Classification
Q1: Based on the echocardiogram finding of an LVEF of 30%, JoAnn's heart failure is
best classified as:
A. Heart failure with preserved ejection fraction (HFpEF)
B. Heart failure with reduced ejection fraction (HFrEF) [CORRECT]
C. Right-sided heart failure only
D. Diastolic heart failure
Correct Answer: B
Rationale: An LVEF ≤40% defines HFrEF (systolic failure), whereas HFpEF requires an
LVEF ≥50%. The terms "diastolic failure" and HFpEF are often confused with reduced
function—JoAnn's 30% EF indicates impaired systolic contraction.
, Q2: Which compensatory mechanism is most directly responsible for JoAnn's increased
heart rate of 102?
A. Activation of the renin-angiotensin-aldosterone system (RAAS)
B. Sympathetic nervous system activation with increased catecholamine release
[CORRECT]
C. Release of B-type natriuretic peptide
D. Increased vagal tone from baroreceptor stretch
Correct Answer: B
Rationale: Reduced cardiac output triggers sympathetic nervous system activation,
increasing heart rate and contractility. RAAS activation primarily drives fluid retention
and vasoconstriction, while BNP is a compensatory counter-regulatory hormone
released in response to volume overload, not a cause of tachycardia.
Q3: Chronic RAAS activation in JoAnn contributes to her worsening heart failure
primarily by:
A. Promoting natriuresis and lowering preload
B. Causing vasoconstriction and sodium/water retention, increasing afterload and
preload and promoting ventricular remodeling [CORRECT]
C. Decreasing aldosterone secretion
D. Enhancing diuresis through tubular effects
Correct Answer: B
Rationale: RAAS activation produces angiotensin II–mediated vasoconstriction
(increased afterload), aldosterone-driven sodium and water retention (increased
preload), and pathologic ventricular remodeling—compensatory mechanisms that
become maladaptive over time.
Q4: JoAnn's atrial fibrillation with irregularly irregular rhythm contributes to her
decompensation primarily because it:
A. Increases atrial kick, improving ventricular filling
B. Eliminates effective atrial contraction and reduces ventricular filling, lowering cardiac
output [CORRECT]
C. Slows the ventricular response rate
D. Decreases myocardial oxygen demand
Correct Answer: B
Rationale: Loss of coordinated atrial contraction reduces ventricular preload, and a
rapid ventricular response shortens diastolic filling time—both decreasing cardiac
Exam 2026/2027 – Complete Exam-Style Questions with
Detailed Rationales | 100% Verified | Pass Guaranteed – A+
Graded
Case Snapshot: JoAnn Smith is a 72-year-old female admitted to the medical-surgical
unit with a 3-day history of worsening shortness of breath, orthopnea, fatigue, and a 5-lb
weight gain. She has a history of hypertension, type 2 diabetes, and myocardial
infarction (5 years ago). Home medications include lisinopril, metoprolol, furosemide,
and metformin. Vital signs: BP 152/94 mmHg, HR 102 (irregularly irregular), RR 28, SpO₂
89% on room air, T 37.1°C. Physical exam reveals bilateral crackles to mid-lung fields, +2
pitting edema of the lower extremities, jugular venous distention, and an S3 gallop. BNP:
1,450 pg/mL. Chest x-ray shows cardiomegaly and pulmonary congestion.
Echocardiogram: LVEF 30%. ECG: atrial fibrillation.
Section A: Heart Failure Pathophysiology & Classification
Q1: Based on the echocardiogram finding of an LVEF of 30%, JoAnn's heart failure is
best classified as:
A. Heart failure with preserved ejection fraction (HFpEF)
B. Heart failure with reduced ejection fraction (HFrEF) [CORRECT]
C. Right-sided heart failure only
D. Diastolic heart failure
Correct Answer: B
Rationale: An LVEF ≤40% defines HFrEF (systolic failure), whereas HFpEF requires an
LVEF ≥50%. The terms "diastolic failure" and HFpEF are often confused with reduced
function—JoAnn's 30% EF indicates impaired systolic contraction.
, Q2: Which compensatory mechanism is most directly responsible for JoAnn's increased
heart rate of 102?
A. Activation of the renin-angiotensin-aldosterone system (RAAS)
B. Sympathetic nervous system activation with increased catecholamine release
[CORRECT]
C. Release of B-type natriuretic peptide
D. Increased vagal tone from baroreceptor stretch
Correct Answer: B
Rationale: Reduced cardiac output triggers sympathetic nervous system activation,
increasing heart rate and contractility. RAAS activation primarily drives fluid retention
and vasoconstriction, while BNP is a compensatory counter-regulatory hormone
released in response to volume overload, not a cause of tachycardia.
Q3: Chronic RAAS activation in JoAnn contributes to her worsening heart failure
primarily by:
A. Promoting natriuresis and lowering preload
B. Causing vasoconstriction and sodium/water retention, increasing afterload and
preload and promoting ventricular remodeling [CORRECT]
C. Decreasing aldosterone secretion
D. Enhancing diuresis through tubular effects
Correct Answer: B
Rationale: RAAS activation produces angiotensin II–mediated vasoconstriction
(increased afterload), aldosterone-driven sodium and water retention (increased
preload), and pathologic ventricular remodeling—compensatory mechanisms that
become maladaptive over time.
Q4: JoAnn's atrial fibrillation with irregularly irregular rhythm contributes to her
decompensation primarily because it:
A. Increases atrial kick, improving ventricular filling
B. Eliminates effective atrial contraction and reduces ventricular filling, lowering cardiac
output [CORRECT]
C. Slows the ventricular response rate
D. Decreases myocardial oxygen demand
Correct Answer: B
Rationale: Loss of coordinated atrial contraction reduces ventricular preload, and a
rapid ventricular response shortens diastolic filling time—both decreasing cardiac
