ATI Adult Medical-Surgical Cardiovascular Disorders Exam – Unit 4 Actual Exam
2026/2027: Complete Exam-Style Questions with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
TABLE OF CONTENTS
Section 1 | Cardiac Anatomy, Physiology & Diagnostic Tests | Q1 – Q10
Section 2 | Hypertension, Dyslipidemia & Preventive Cardiology | Q11 – Q20
Section 3 | Coronary Artery Disease & Acute Coronary Syndromes | Q21 – Q30
Section 4 | Heart Failure, Cardiomyopathies & Inflammatory Disorders | Q31 – Q40
Section 5 | Arrhythmias, Valvular Disorders & Peripheral Vascular Disease | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
══════════════════════════════════════
SECTION 1: CARDIAC ANATOMY, PHYSIOLOGY & DIAGNOSTIC TESTS Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A 68-year-old male is admitted for syncope workup. His ECG shows a P wave before
every QRS complex, but the PR interval is progressively lengthening until a QRS complex
is dropped. The nurse recognizes this as second-degree AV block Type I (Wenckebach).
This rhythm originates from dysfunction in which structure?
A. The AV node ✓ CORRECT
B. The SA node
C. The bundle of His
D. The Purkinje fibers
Correct Answer: A
Rationale: Second-degree AV block Type I (Wenckebach) is characterized by progressive
PR interval prolongation until a QRS complex is dropped, and it typically originates from
delayed conduction in the AV node. The SA node is the pacemaker and would not cause
,this progressive delay pattern, while bundle of His or Purkinje fiber blocks usually
present as Type II blocks with constant PR intervals before dropped beats. Recognizing
the site of block helps predict whether the rhythm will progress to complete heart block.
Question 2 of 50
A 54-year-old woman is scheduled for a cardiac catheterization. The nurse is reviewing
pre-procedure teaching. The client asks why she needs to lie flat for several hours after
the femoral approach. The nurse explains that this positioning is primarily necessary to
prevent what complication?
A. Air embolism
B. Bleeding and hematoma formation at the insertion site ✓ CORRECT
C. Cardiac tamponade
D. Pulmonary embolism
Correct Answer: B
Rationale: After femoral cardiac catheterization, lying flat with the leg extended applies
pressure to the arterial puncture site and reduces the risk of bleeding or hematoma
formation. Air embolism and pulmonary embolism are not prevented by flat positioning,
and cardiac tamponade is a rare complication unrelated to post-procedure positioning.
Nurses should also monitor the site and distal pulses frequently during the flat-rest
period.
Question 3 of 50
A 72-year-old male with a history of heart failure has a BNP level of 850 pg/mL drawn in
the emergency department. The nurse understands that BNP is released primarily in
response to what physiological stimulus?
A. Myocardial ischemia
B. Sympathetic nervous system activation
C. Ventricular wall stretch and volume overload ✓ CORRECT
,D. Inflammatory cytokine release
Correct Answer: C
Rationale: B-type natriuretic peptide (BNP) is released from ventricular myocardium in
response to ventricular wall stretch caused by volume overload and increased filling
pressures. While sympathetic activation and inflammation occur in heart failure, they
are not the primary stimuli for BNP secretion. This lab value supports the client's heart
failure exacerbation and helps differentiate cardiac from pulmonary causes of dyspnea.
Question 4 of 50
A 45-year-old woman presents to the clinic with palpitations. Her ECG reveals a
narrow-complex tachycardia with a heart rate of 180 bpm and no discernible P waves.
The nurse suspects supraventricular tachycardia (SVT). The reentrant circuit
responsible for most paroxysmal SVT involves which anatomical pathway?
A. The accessory pathway between the atria and ventricles
B. The sinoatrial node and crista terminalis
C. The bundle branch and Purkinje network
D. The AV node and an accessory retrograde pathway ✓ CORRECT
Correct Answer: D
Rationale: The most common mechanism for paroxysmal SVT is AV nodal reentrant
tachycardia (AVNRT), which involves a reentrant circuit within or around the AV node
using both antegrade and retrograde pathways. Accessory pathways between atria and
ventricles cause AVRT or WPW, not typical AVNRT. Bundle branch reentry and SA nodal
circuits are less common causes of SVT and require different management
considerations.
Question 5 of 50
, A 61-year-old man is recovering from an acute MI. The nurse is monitoring his
hemodynamics and notes that his cardiac output has decreased while his systemic
vascular resistance has increased. The nurse understands that these changes are most
consistent with activation of which compensatory mechanism?
A. The baroreceptor reflex ✓ CORRECT
B. The renin-angiotensin-aldosterone system
C. The chemoreceptor reflex
D. The release of atrial natriuretic peptide
Correct Answer: A
Rationale: When cardiac output drops, arterial pressure falls and baroreceptors in the
carotid sinus and aortic arch trigger sympathetic vasoconstriction to maintain perfusion
pressure, increasing systemic vascular resistance. While RAAS is activated later, the
immediate hemodynamic response is baroreceptor-mediated. Chemoreceptors respond
to hypoxia, and ANP release would cause vasodilation rather than constriction.
Question 6 of 50
A 38-year-old athlete undergoes a routine sports physical. His ECG shows sinus
bradycardia at 48 bpm with normal P waves, PR intervals, and QRS complexes. The
nurse explains that this finding is likely due to what physiological adaptation?
A. Decreased vagal tone from chronic training
B. Increased vagal tone and enhanced stroke volume ✓ CORRECT
C. Degeneration of the sinoatrial node
D. Hypothyroidism-induced metabolic slowing
Correct Answer: B
Rationale: Well-trained athletes often develop sinus bradycardia due to increased vagal
tone and a larger stroke volume that allows the heart to maintain adequate cardiac
output at slower rates. Decreased vagal tone would cause tachycardia, and SA node
degeneration or hypothyroidism are pathological causes not expected in a healthy
2026/2027: Complete Exam-Style Questions with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
TABLE OF CONTENTS
Section 1 | Cardiac Anatomy, Physiology & Diagnostic Tests | Q1 – Q10
Section 2 | Hypertension, Dyslipidemia & Preventive Cardiology | Q11 – Q20
Section 3 | Coronary Artery Disease & Acute Coronary Syndromes | Q21 – Q30
Section 4 | Heart Failure, Cardiomyopathies & Inflammatory Disorders | Q31 – Q40
Section 5 | Arrhythmias, Valvular Disorders & Peripheral Vascular Disease | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
══════════════════════════════════════
SECTION 1: CARDIAC ANATOMY, PHYSIOLOGY & DIAGNOSTIC TESTS Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A 68-year-old male is admitted for syncope workup. His ECG shows a P wave before
every QRS complex, but the PR interval is progressively lengthening until a QRS complex
is dropped. The nurse recognizes this as second-degree AV block Type I (Wenckebach).
This rhythm originates from dysfunction in which structure?
A. The AV node ✓ CORRECT
B. The SA node
C. The bundle of His
D. The Purkinje fibers
Correct Answer: A
Rationale: Second-degree AV block Type I (Wenckebach) is characterized by progressive
PR interval prolongation until a QRS complex is dropped, and it typically originates from
delayed conduction in the AV node. The SA node is the pacemaker and would not cause
,this progressive delay pattern, while bundle of His or Purkinje fiber blocks usually
present as Type II blocks with constant PR intervals before dropped beats. Recognizing
the site of block helps predict whether the rhythm will progress to complete heart block.
Question 2 of 50
A 54-year-old woman is scheduled for a cardiac catheterization. The nurse is reviewing
pre-procedure teaching. The client asks why she needs to lie flat for several hours after
the femoral approach. The nurse explains that this positioning is primarily necessary to
prevent what complication?
A. Air embolism
B. Bleeding and hematoma formation at the insertion site ✓ CORRECT
C. Cardiac tamponade
D. Pulmonary embolism
Correct Answer: B
Rationale: After femoral cardiac catheterization, lying flat with the leg extended applies
pressure to the arterial puncture site and reduces the risk of bleeding or hematoma
formation. Air embolism and pulmonary embolism are not prevented by flat positioning,
and cardiac tamponade is a rare complication unrelated to post-procedure positioning.
Nurses should also monitor the site and distal pulses frequently during the flat-rest
period.
Question 3 of 50
A 72-year-old male with a history of heart failure has a BNP level of 850 pg/mL drawn in
the emergency department. The nurse understands that BNP is released primarily in
response to what physiological stimulus?
A. Myocardial ischemia
B. Sympathetic nervous system activation
C. Ventricular wall stretch and volume overload ✓ CORRECT
,D. Inflammatory cytokine release
Correct Answer: C
Rationale: B-type natriuretic peptide (BNP) is released from ventricular myocardium in
response to ventricular wall stretch caused by volume overload and increased filling
pressures. While sympathetic activation and inflammation occur in heart failure, they
are not the primary stimuli for BNP secretion. This lab value supports the client's heart
failure exacerbation and helps differentiate cardiac from pulmonary causes of dyspnea.
Question 4 of 50
A 45-year-old woman presents to the clinic with palpitations. Her ECG reveals a
narrow-complex tachycardia with a heart rate of 180 bpm and no discernible P waves.
The nurse suspects supraventricular tachycardia (SVT). The reentrant circuit
responsible for most paroxysmal SVT involves which anatomical pathway?
A. The accessory pathway between the atria and ventricles
B. The sinoatrial node and crista terminalis
C. The bundle branch and Purkinje network
D. The AV node and an accessory retrograde pathway ✓ CORRECT
Correct Answer: D
Rationale: The most common mechanism for paroxysmal SVT is AV nodal reentrant
tachycardia (AVNRT), which involves a reentrant circuit within or around the AV node
using both antegrade and retrograde pathways. Accessory pathways between atria and
ventricles cause AVRT or WPW, not typical AVNRT. Bundle branch reentry and SA nodal
circuits are less common causes of SVT and require different management
considerations.
Question 5 of 50
, A 61-year-old man is recovering from an acute MI. The nurse is monitoring his
hemodynamics and notes that his cardiac output has decreased while his systemic
vascular resistance has increased. The nurse understands that these changes are most
consistent with activation of which compensatory mechanism?
A. The baroreceptor reflex ✓ CORRECT
B. The renin-angiotensin-aldosterone system
C. The chemoreceptor reflex
D. The release of atrial natriuretic peptide
Correct Answer: A
Rationale: When cardiac output drops, arterial pressure falls and baroreceptors in the
carotid sinus and aortic arch trigger sympathetic vasoconstriction to maintain perfusion
pressure, increasing systemic vascular resistance. While RAAS is activated later, the
immediate hemodynamic response is baroreceptor-mediated. Chemoreceptors respond
to hypoxia, and ANP release would cause vasodilation rather than constriction.
Question 6 of 50
A 38-year-old athlete undergoes a routine sports physical. His ECG shows sinus
bradycardia at 48 bpm with normal P waves, PR intervals, and QRS complexes. The
nurse explains that this finding is likely due to what physiological adaptation?
A. Decreased vagal tone from chronic training
B. Increased vagal tone and enhanced stroke volume ✓ CORRECT
C. Degeneration of the sinoatrial node
D. Hypothyroidism-induced metabolic slowing
Correct Answer: B
Rationale: Well-trained athletes often develop sinus bradycardia due to increased vagal
tone and a larger stroke volume that allows the heart to maintain adequate cardiac
output at slower rates. Decreased vagal tone would cause tachycardia, and SA node
degeneration or hypothyroidism are pathological causes not expected in a healthy
