1
CCI REGISTRY EXAM -
CARDIOVASCULAR CREDENTIALING
INTERNATIONAL (2026 EDITION).
CARDIOVASCULAR ANATOMY AND PHYSIOLOGY (Q1–Q10)
Q1: Which coronary artery typically supplies the anterior wall of the left ventricle and the
anterior two-thirds of the interventricular septum?
A. Left circumflex artery
B. Right coronary artery
C. Left anterior descending artery [CORRECT]
D. Posterior descending artery
Correct Answer: C
Rationale: The left anterior descending (LAD) artery, a branch of the left main coronary
artery, supplies the anterior wall of the left ventricle and the anterior two-thirds of the
interventricular septum. LAD occlusion classically produces ST-elevation in leads V1–V4
on ECG, consistent with an anterior wall myocardial infarction per ACC/AHA guidelines.
Q2: During which phase of the cardiac cycle does the mitral valve open, allowing blood
to flow from the left atrium into the left ventricle?
A. Isovolumetric contraction
B. Isovolumetric relaxation
C. Early ventricular diastole when left ventricular pressure falls below left atrial pressure
[CORRECT]
D. Atrial systole only
Correct Answer: C
Rationale: The mitral valve opens during early ventricular diastole when left ventricular
pressure drops below left atrial pressure, initiating rapid ventricular filling. This occurs
immediately following isovolumetric relaxation and is a fundamental principle of cardiac
hemodynamics assessed during echocardiographic Doppler evaluation.
Q3: The normal range for pulmonary artery wedge pressure (PAWP) in a healthy adult at
rest is:
, 2
A. 0–5 mmHg
B. 6–12 mmHg [CORRECT]
C. 15–25 mmHg
D. 25–35 mmHg
Correct Answer: B
Rationale: Normal PAWP ranges from 6–12 mmHg and reflects left atrial pressure,
serving as an indirect measure of left ventricular end-diastolic pressure (preload) in the
absence of mitral valve disease. Elevations above 18 mmHg indicate left ventricular
failure per standard hemodynamic monitoring protocols.
Q4: Which component of the cardiac conduction system has the slowest intrinsic
conduction velocity, creating the physiological delay necessary for atrial emptying
before ventricular contraction?
A. Sinoatrial node
B. Atrioventricular node [CORRECT]
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale: The atrioventricular (AV) node has the slowest intrinsic conduction velocity
(approximately 0.02–0.05 m/sec), producing the PR interval on ECG and allowing
complete atrial systole before ventricular depolarization. This delay is critical for optimal
ventricular filling and is the target of AV nodal blocking agents in rate control strategies.
Q5: A patient has a cardiac output of 5.5 L/min and a body surface area of 1.8 m². What is
the patient's cardiac index?
A. 3.06 L/min/m² [CORRECT]
B. 9.9 L/min/m²
C. 5.5 L/min/m²
D. 1.8 L/min/m²
Correct Answer: A
Rationale: Cardiac index (CI) is calculated as cardiac output (CO) divided by body
surface area (BSA): CI = CO / BSA = 5..8 = 3.06 L/min/m². Normal cardiac index
ranges from 2.5–4.0 L/min/m²; values below 2.2 L/min/m² indicate low-output states
, 3
requiring hemodynamic intervention per Society for Cardiovascular Angiography and
Interventions (SCAI) shock stages.
Q6: Which factor primarily determines myocardial oxygen demand during increased
physical activity?
A. Heart rate alone
B. Heart rate × systolic blood pressure (double product) [CORRECT]
C. Diastolic blood pressure alone
D. Stroke volume alone
Correct Answer: B
Rationale: Myocardial oxygen demand is best estimated by the double product (heart
rate × systolic blood pressure), as both increased heart rate and elevated wall tension
(reflected by systolic pressure) significantly increase oxygen consumption. This
principle underlies the rationale for beta-blocker therapy in coronary artery disease to
reduce myocardial oxygen demand.
Q7: During the cardiac action potential, which ion is primarily responsible for the rapid
depolarization (Phase 0) of ventricular myocardial cells?
A. Potassium efflux
B. Calcium influx
C. Sodium influx [CORRECT]
D. Chloride influx
Correct Answer: C
Rationale: Phase 0 rapid depolarization of ventricular myocardial cells is mediated by
fast sodium channel opening and sodium ion influx. Class I antiarrhythmic agents
(sodium channel blockers) exert their effects by modifying this phase, and
understanding this ionic basis is essential for interpreting drug mechanisms and ECG
changes.
Q8: The fourth heart sound (S4) is produced by:
A. Closure of the semilunar valves
B. Turbulent blood flow across a stenotic valve
C. Atrial contraction against a non-compliant, stiff left ventricle [CORRECT]
D. Closure of the atrioventricular valves
, 4
Correct Answer: C
Rationale: The S4 gallop sound occurs during late diastole due to atrial contraction
forcing blood into a non-compliant, hypertrophied, or stiff left ventricle. It is commonly
heard in patients with left ventricular hypertrophy, hypertension, or aortic stenosis, and
its presence indicates decreased ventricular compliance per standard cardiac
auscultation principles.
Q9: Systemic vascular resistance (SVR) is calculated using which formula?
A. (Mean arterial pressure – Central venous pressure) / Cardiac output × 80 [CORRECT]
B. (Mean arterial pressure – Pulmonary capillary wedge pressure) / Cardiac output
C. (Pulmonary artery pressure – Left atrial pressure) / Cardiac output
D. Systolic blood pressure / Diastolic blood pressure × Cardiac output
Correct Answer: A
Rationale: SVR = [(MAP – CVP) / CO] × 80, where the conversion factor of 80 converts
units to dynes·sec·cm⁻⁵. Normal SVR ranges from 900–1400 dynes·sec·cm⁻⁵. This
calculation is fundamental for differentiating shock states and guiding vasopressor
therapy in cardiovascular critical care.
Q10: In a healthy adult, approximately what percentage of ventricular filling occurs
during the rapid filling phase of early diastole?
A. 10%
B. 25%
C. 50% [CORRECT]
D. 80%
Correct Answer: C
Rationale: Approximately 50% of ventricular filling occurs during the rapid filling phase
of early diastole, driven by the pressure gradient between the atrium and ventricle
immediately following AV valve opening. The remaining filling occurs during atrial
systole (the "atrial kick"), which contributes 15–25% of stroke volume at rest but
becomes more significant at elevated heart rates.
CARDIOVASCULAR PATHOPHYSIOLOGY (Q11–Q22)
Q11: A 68-year-old male presents with crushing substernal chest pain and ST-elevation
in leads II, III, and aVF. Which coronary artery territory is most likely affected?
A. Left anterior descending
CCI REGISTRY EXAM -
CARDIOVASCULAR CREDENTIALING
INTERNATIONAL (2026 EDITION).
CARDIOVASCULAR ANATOMY AND PHYSIOLOGY (Q1–Q10)
Q1: Which coronary artery typically supplies the anterior wall of the left ventricle and the
anterior two-thirds of the interventricular septum?
A. Left circumflex artery
B. Right coronary artery
C. Left anterior descending artery [CORRECT]
D. Posterior descending artery
Correct Answer: C
Rationale: The left anterior descending (LAD) artery, a branch of the left main coronary
artery, supplies the anterior wall of the left ventricle and the anterior two-thirds of the
interventricular septum. LAD occlusion classically produces ST-elevation in leads V1–V4
on ECG, consistent with an anterior wall myocardial infarction per ACC/AHA guidelines.
Q2: During which phase of the cardiac cycle does the mitral valve open, allowing blood
to flow from the left atrium into the left ventricle?
A. Isovolumetric contraction
B. Isovolumetric relaxation
C. Early ventricular diastole when left ventricular pressure falls below left atrial pressure
[CORRECT]
D. Atrial systole only
Correct Answer: C
Rationale: The mitral valve opens during early ventricular diastole when left ventricular
pressure drops below left atrial pressure, initiating rapid ventricular filling. This occurs
immediately following isovolumetric relaxation and is a fundamental principle of cardiac
hemodynamics assessed during echocardiographic Doppler evaluation.
Q3: The normal range for pulmonary artery wedge pressure (PAWP) in a healthy adult at
rest is:
, 2
A. 0–5 mmHg
B. 6–12 mmHg [CORRECT]
C. 15–25 mmHg
D. 25–35 mmHg
Correct Answer: B
Rationale: Normal PAWP ranges from 6–12 mmHg and reflects left atrial pressure,
serving as an indirect measure of left ventricular end-diastolic pressure (preload) in the
absence of mitral valve disease. Elevations above 18 mmHg indicate left ventricular
failure per standard hemodynamic monitoring protocols.
Q4: Which component of the cardiac conduction system has the slowest intrinsic
conduction velocity, creating the physiological delay necessary for atrial emptying
before ventricular contraction?
A. Sinoatrial node
B. Atrioventricular node [CORRECT]
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale: The atrioventricular (AV) node has the slowest intrinsic conduction velocity
(approximately 0.02–0.05 m/sec), producing the PR interval on ECG and allowing
complete atrial systole before ventricular depolarization. This delay is critical for optimal
ventricular filling and is the target of AV nodal blocking agents in rate control strategies.
Q5: A patient has a cardiac output of 5.5 L/min and a body surface area of 1.8 m². What is
the patient's cardiac index?
A. 3.06 L/min/m² [CORRECT]
B. 9.9 L/min/m²
C. 5.5 L/min/m²
D. 1.8 L/min/m²
Correct Answer: A
Rationale: Cardiac index (CI) is calculated as cardiac output (CO) divided by body
surface area (BSA): CI = CO / BSA = 5..8 = 3.06 L/min/m². Normal cardiac index
ranges from 2.5–4.0 L/min/m²; values below 2.2 L/min/m² indicate low-output states
, 3
requiring hemodynamic intervention per Society for Cardiovascular Angiography and
Interventions (SCAI) shock stages.
Q6: Which factor primarily determines myocardial oxygen demand during increased
physical activity?
A. Heart rate alone
B. Heart rate × systolic blood pressure (double product) [CORRECT]
C. Diastolic blood pressure alone
D. Stroke volume alone
Correct Answer: B
Rationale: Myocardial oxygen demand is best estimated by the double product (heart
rate × systolic blood pressure), as both increased heart rate and elevated wall tension
(reflected by systolic pressure) significantly increase oxygen consumption. This
principle underlies the rationale for beta-blocker therapy in coronary artery disease to
reduce myocardial oxygen demand.
Q7: During the cardiac action potential, which ion is primarily responsible for the rapid
depolarization (Phase 0) of ventricular myocardial cells?
A. Potassium efflux
B. Calcium influx
C. Sodium influx [CORRECT]
D. Chloride influx
Correct Answer: C
Rationale: Phase 0 rapid depolarization of ventricular myocardial cells is mediated by
fast sodium channel opening and sodium ion influx. Class I antiarrhythmic agents
(sodium channel blockers) exert their effects by modifying this phase, and
understanding this ionic basis is essential for interpreting drug mechanisms and ECG
changes.
Q8: The fourth heart sound (S4) is produced by:
A. Closure of the semilunar valves
B. Turbulent blood flow across a stenotic valve
C. Atrial contraction against a non-compliant, stiff left ventricle [CORRECT]
D. Closure of the atrioventricular valves
, 4
Correct Answer: C
Rationale: The S4 gallop sound occurs during late diastole due to atrial contraction
forcing blood into a non-compliant, hypertrophied, or stiff left ventricle. It is commonly
heard in patients with left ventricular hypertrophy, hypertension, or aortic stenosis, and
its presence indicates decreased ventricular compliance per standard cardiac
auscultation principles.
Q9: Systemic vascular resistance (SVR) is calculated using which formula?
A. (Mean arterial pressure – Central venous pressure) / Cardiac output × 80 [CORRECT]
B. (Mean arterial pressure – Pulmonary capillary wedge pressure) / Cardiac output
C. (Pulmonary artery pressure – Left atrial pressure) / Cardiac output
D. Systolic blood pressure / Diastolic blood pressure × Cardiac output
Correct Answer: A
Rationale: SVR = [(MAP – CVP) / CO] × 80, where the conversion factor of 80 converts
units to dynes·sec·cm⁻⁵. Normal SVR ranges from 900–1400 dynes·sec·cm⁻⁵. This
calculation is fundamental for differentiating shock states and guiding vasopressor
therapy in cardiovascular critical care.
Q10: In a healthy adult, approximately what percentage of ventricular filling occurs
during the rapid filling phase of early diastole?
A. 10%
B. 25%
C. 50% [CORRECT]
D. 80%
Correct Answer: C
Rationale: Approximately 50% of ventricular filling occurs during the rapid filling phase
of early diastole, driven by the pressure gradient between the atrium and ventricle
immediately following AV valve opening. The remaining filling occurs during atrial
systole (the "atrial kick"), which contributes 15–25% of stroke volume at rest but
becomes more significant at elevated heart rates.
CARDIOVASCULAR PATHOPHYSIOLOGY (Q11–Q22)
Q11: A 68-year-old male presents with crushing substernal chest pain and ST-elevation
in leads II, III, and aVF. Which coronary artery territory is most likely affected?
A. Left anterior descending
