Question 1

In truncus arteriosus, which of the following is true?

Accepted Answer

Answer reason: Truncus arteriosus is a congenital defect where a single arterial trunk arises from the heart, causing mixing of oxygenated and deoxygenated blood and resulting in cyanosis. It is typically associated with a large ventricular septal defect, so ventricular communication is present rather than absent. The aorta and pulmonary artery are not separate at birth (they arise from the common trunk). It generally presents early in infancy with cyanosis and heart failure symptoms, not late in life.
Category reason: This question tests foundational knowledge of a congenital cardiac malformation and its hallmark clinical feature (cyanosis), which is core cardiovascular physiology/pathology rather than a nursing intervention or prioritization task.

Question 2

Box-shaped heart on chest X-ray is seen in?

Accepted Answer

Answer reason: Apical displacement of the tricuspid valve leads to marked right atrial enlargement and an “atrialized” portion of the right ventricle, creating a characteristically box-shaped (or sometimes described as square) cardiac silhouette on chest X-ray. In contrast, TOF is classically associated with a boot-shaped heart, and TGA with an “egg-on-a-string” appearance. Truncus arteriosus more often produces cardiomegaly with increased pulmonary vascular markings rather than a box-shaped silhouette.
Category reason: This question tests recognition of classic radiographic/cardiac morphology associated with specific congenital heart diseases, which is foundational cardiovascular medicine knowledge rather than a nursing intervention or prioritization task.

Question 3

Which congenital heart defect is associated with a “snowman” appearance on X-ray?

Accepted Answer

Answer reason: The classic “snowman” (figure-of-8) mediastinal silhouette on chest X-ray is most associated with supracardiac total anomalous pulmonary venous return due to dilation of the vertical vein and superior vena cava forming the upper "head," with an enlarged right atrium forming the lower portion. This radiographic sign reflects abnormal pulmonary venous drainage above the heart. TOF more commonly shows a “boot-shaped” heart, VSD often has cardiomegaly with increased pulmonary vascular markings (if large), and truncus arteriosus tends to show cardiomegaly with increased pulmonary blood flow rather than a snowman configuration.
Category reason: This is a foundational identification question about a congenital cardiac lesion and its characteristic chest X-ray appearance, which is tested as cardiovascular pathophysiology/diagnostics rather than nursing interventions.

Question 4

Ductal-dependent lesions include all except:

Accepted Answer

Answer reason: D. ASD Ductal-dependent congenital heart lesions require a patent ductus arteriosus to maintain either systemic blood flow (left-sided obstructive lesions) or pulmonary blood flow (right-sided obstructive lesions) until definitive intervention. Pulmonary atresia and TOF with pulmonary atresia depend on ductal flow to provide pulmonary perfusion. Hypoplastic left heart syndrome depends on ductal flow to provide systemic perfusion. An isolated atrial septal defect typically allows left-to-right shunting without requiring ductal patency to sustain circulation.
Category reason: This item tests recognition of congenital heart defects that require a patent ductus arteriosus for adequate systemic or pulmonary circulation, which is core cardiovascular pathophysiology/physiology knowledge rather than a nursing intervention decision.

Question 5

Which CHD leads to left ventricular hypertrophy?

Accepted Answer

Answer reason: This condition creates a fixed obstruction to left ventricular outflow, increasing afterload and systolic pressure the left ventricle must generate to maintain systemic perfusion. Chronic pressure overload drives concentric left ventricular hypertrophy. In contrast, ASD primarily causes right-sided volume overload, Ebstein anomaly affects the right heart, and TOF is associated more with right ventricular hypertrophy from right ventricular outflow obstruction.
Category reason: This is a foundational pathophysiology question about how specific congenital heart defects affect ventricular workload and remodeling (hypertrophy), which fits best under the Cardiovascular System.

Question 6

A bounding pulse is associated with which condition?

Accepted Answer

Answer reason: A bounding pulse is classically linked to a wide pulse pressure caused by increased stroke volume and rapid runoff of blood back into the left ventricle during diastole. This produces a “water-hammer” (Corrigan) pulse that feels strong and forceful. In contrast, hypovolemia and cardiogenic shock typically produce weak, thready pulses due to low effective circulating volume or poor cardiac output. Although heart failure can have variable pulse findings, a prominent bounding pulse most specifically points to regurgitant lesions with widened pulse pressure.
Category reason: This item tests recognition of a classic cardiovascular physical sign (bounding pulse) and its underlying hemodynamic association with a valvular lesion, which is foundational cardiovascular science rather than a nursing intervention decision.

Question 7

What is the term for the palpable vibration associated with a heart murmur?

Accepted Answer

Answer reason: A palpable vibration over the precordium occurs when turbulent blood flow is strong enough to be felt on the chest wall. This tactile finding corresponds to higher-grade murmurs and is assessed by placing the palm or fingertips on the area of maximal intensity. A bruit is turbulent flow heard over arteries, a rub is a scratchy sound from pericardial/pleural friction, and a gallop refers to extra heart sounds (S3/S4) rather than a palpable vibration.
Category reason: This is a foundational cardiovascular assessment terminology question (definitions of murmur-related findings), which fits Cardiovascular System rather than nursing intervention decision-making.

Question 8

Which pulse amplitude grading corresponds to a normal pulse?

Accepted Answer

Answer reason: Pulse amplitude is commonly graded on a 0 to 4+ scale, where 0 is absent and 1+ is weak/thready. A 2+ pulse is considered normal—easily palpable with expected strength and symmetry for the patient. A 4+ pulse is bounding and suggests increased stroke volume or decreased peripheral resistance (e.g., fever, anxiety, hyperthyroidism), rather than normal.
Category reason: This tests knowledge of cardiovascular physical assessment terminology and normal findings for peripheral pulse grading, which fits the Cardiovascular System subject rather than nursing intervention decision-making.

Question 9

A newborn with truncus arteriosus should be screened for which genetic defect?

Accepted Answer

Answer reason: Conotruncal cardiac defects such as truncus arteriosus are strongly associated with 22q11.2 deletion (DiGeorge/velocardiofacial spectrum) due to abnormal neural crest cell migration affecting outflow tract development. Newborns with this lesion should be evaluated for this microdeletion because it also predicts associated hypocalcemia, immune dysfunction, and palatal anomalies that impact early management. Trisomy 13 and 18 can have congenital heart disease but are not the characteristic association for truncus arteriosus. Fragile X is primarily linked to neurodevelopmental findings rather than specific conotruncal heart defects.
Category reason: This item tests the association between a specific congenital heart defect (truncus arteriosus) and a characteristic chromosomal microdeletion, which is primarily biomedical/genetic knowledge within cardiovascular congenital pathology rather than a nursing intervention decision.

Question 10

A newborn presents with weak femoral pulses and upper limb hypertension. Likely diagnosis?

Accepted Answer

Answer reason: B. Coarctation of the aorta The combination of upper extremity hypertension with weak/absent femoral pulses is classic for a narrowing of the aorta distal to the branches supplying the arms, producing a pressure gradient between upper and lower body. This lesion reduces perfusion to the lower extremities, leading to diminished femoral pulses and lower limb hypotension/poor perfusion signs. Aortic stenosis typically causes systemic hypoperfusion without this arm–leg BP discrepancy, PDA more often causes bounding pulses/widened pulse pressure, and pulmonary stenosis primarily affects right-sided pressures and pulmonary blood flow rather than femoral pulses.
Category reason: This question tests recognition of a congenital cardiovascular lesion based on characteristic pulse and blood pressure findings, which is foundational disease-pattern knowledge within the Cardiovascular System rather than a nursing intervention or prioritization decision.

Question 11

Which cardiac defect leads to pulmonary overcirculation and heart failure in infancy?

Accepted Answer

Answer reason: A large left-to-right shunt increases pulmonary blood flow, causing pulmonary overcirculation and volume overload of the left heart. This typically presents in early infancy as tachypnea, poor feeding, diaphoresis, and failure to thrive due to congestive heart failure. ASD often causes minimal symptoms in infancy, while TOF classically causes decreased pulmonary blood flow with cyanotic spells. TGA primarily causes profound cyanosis from parallel circulation rather than pulmonary overcirculation–driven heart failure.
Category reason: This is testing congenital heart physiology and hemodynamic consequences (pulmonary blood flow and heart failure) rather than nursing interventions, fitting Cardiovascular System.

Question 12

The right atrial blood is divided by which structure in fetal life?

Accepted Answer

Answer reason: D. Valve of IVC In fetal circulation, the Eustachian valve (valve of the IVC) helps direct oxygenated blood entering the right atrium from the inferior vena cava toward the foramen ovale. This preferential streaming effectively separates (divides) the right atrial inflow so more highly oxygenated blood crosses into the left atrium for delivery to the brain and heart. The other listed structures do not perform this fetal right-atrial flow-directing function.
Category reason: This tests fetal cardiac anatomy and blood flow patterns within the heart, which are core topics in the Cardiovascular System.

Question 13

Most of the right ventricular output in fetal life enters the:

Accepted Answer

Answer reason: In fetal circulation, pulmonary vascular resistance is high, so blood ejected from the right ventricle is directed into the pulmonary artery but is largely shunted away from the lungs through the ductus arteriosus. This shunt delivers right ventricular output into the descending aorta to supply the systemic circulation and placenta. Only a small fraction of right ventricular output perfuses the fetal lungs.
Category reason: This tests fetal cardiovascular physiology and the function of the ductus arteriosus in directing right ventricular blood flow, which is foundational content within the Cardiovascular System.

Question 14

The foramen ovale allows blood to flow from:

Accepted Answer

Answer reason: B. Right atrium to left atrium In fetal circulation, the foramen ovale is an interatrial opening that shunts oxygenated blood from the right atrium directly into the left atrium to bypass the nonfunctioning fetal lungs. This helps deliver relatively well-oxygenated blood to the left ventricle and then to the systemic circulation (including the brain and coronary circulation). After birth, increased left atrial pressure and decreased right atrial pressure typically close this opening functionally.
Category reason: This question tests knowledge of fetal cardiac shunts and normal blood flow pathways, which is foundational cardiovascular physiology/anatomy rather than nursing care decision-making.

Question 15

The ductus arteriosus connects:

Accepted Answer

Answer reason: In fetal circulation, the ductus arteriosus provides a right-to-left shunt that diverts blood away from the nonfunctioning fetal lungs. It connects the pulmonary artery to the descending aorta, allowing most right ventricular output to enter systemic circulation. After birth, increased oxygen tension and decreased prostaglandins promote functional closure; persistence leads to a patent ductus arteriosus with abnormal shunting.
Category reason: This is a foundational question about fetal cardiac anatomy and circulation pathways, which falls under the Cardiovascular System.

Question 16

Which vessel carries the most oxygen-rich blood in the fetus?

Accepted Answer

Answer reason: In fetal circulation, oxygenation occurs at the placenta rather than the lungs, so the vessel returning from the placenta carries the highest oxygen content. The umbilical vein delivers this oxygen-rich blood toward the fetal liver and through the ductus venosus into the inferior vena cava. The umbilical arteries carry deoxygenated blood from the fetus to the placenta, and the fetal pulmonary veins are relatively less oxygenated because the lungs are not the primary site of gas exchange before birth.
Category reason: This item tests fetal circulation and relative oxygenation of major vessels, which is foundational cardiovascular physiology rather than a nursing intervention or clinical decision.

Question 17

Functional closure of the foramen ovale occurs:

Accepted Answer

Answer reason: With the first breaths, pulmonary vascular resistance drops and pulmonary blood flow increases, raising left atrial pressure above right atrial pressure. This pressure gradient pushes the septum primum against the septum secundum, producing functional (physiologic) closure immediately after delivery. Anatomical fusion occurs later over months to years, which is distinct from functional closure.
Category reason: This tests fetal-to-neonatal circulatory transition and cardiac shunt closure timing, which is core cardiovascular physiology/anatomy rather than nursing intervention or prioritization.

Question 18

Which of the following CHDs requires immediate balloon atrial septostomy in a neonate?

Accepted Answer

Answer reason: In transposition of the great arteries, systemic and pulmonary circulations run in parallel, so survival depends on mixing at the atrial, ventricular, or ductal level. If the septum is intact (restrictive/absent ASD), mixing is inadequate and profound cyanosis occurs soon after birth. Balloon atrial septostomy (Rashkind procedure) rapidly creates/enlarges an atrial communication to improve oxygenation as a bridge to definitive repair. Other listed lesions do not typically require emergent atrial septostomy for physiologic mixing.
Category reason: This is a foundational question about which congenital cardiac lesion has a specific emergent physiologic need for atrial-level mixing and a corresponding procedure, which fits Cardiovascular System knowledge rather than nursing process/clinical management decisions.

Question 19

In cyanotic spells in TOF, squatting improves oxygenation by:

Accepted Answer

Answer reason: Squatting increases systemic vascular resistance, which reduces the right-to-left shunt across the VSD in Tetralogy of Fallot. This promotes more blood flow through the pulmonary circulation for oxygenation rather than bypassing the lungs into the systemic circulation. The net effect is increased arterial oxygen saturation during a “tet spell.” Options stating decreased SVR, decreased preload, or increased venous return do not describe the primary mechanism that improves oxygenation.
Category reason: This question tests the hemodynamic mechanism of squatting in Tetralogy of Fallot (effects on shunting and pulmonary blood flow), which is foundational cardiovascular physiology/pathophysiology rather than a nursing intervention prioritization scenario.

Question 20

Which is the most appropriate long-term treatment of cyanotic CHD like TOF?

Accepted Answer

Answer reason: Definitive management of tetralogy of Fallot requires corrective surgery to relieve right ventricular outflow obstruction and close the ventricular septal defect, which addresses the underlying right-to-left shunt and chronic hypoxemia. Medications like diuretics are supportive and do not correct the anatomic defect. Prostaglandin infusion is a short-term measure to maintain ductal patency in duct-dependent lesions, not a long-term strategy. Balloon valvotomy may help selected obstructive lesions but is not the standard definitive treatment for this cyanotic congenital heart disease.
Category reason: This question tests definitive treatment for a congenital cardiac structural defect (TOF), which is foundational cardiovascular pathophysiology and management rather than a nursing priority/intervention scenario.

Question 21

Closure of foramen ovale occurs due to:

Accepted Answer

Answer reason: At birth, lung expansion decreases pulmonary vascular resistance, increasing pulmonary blood flow and pulmonary venous return to the left atrium. This raises left atrial pressure while right atrial pressure falls due to reduced placental venous return after cord clamping. The resulting pressure gradient closes the foramen ovale functionally by pressing the septum primum against the septum secundum, with anatomic fusion occurring later.
Category reason: This question tests the physiologic cardiovascular changes at birth that alter intracardiac pressures and close fetal shunts, which is core Cardiovascular System content.

Question 22

What is a thrill?

Accepted Answer

Answer reason: A thrill is a palpable vibration transmitted to the chest wall or vessel wall by turbulent blood flow, commonly associated with a significant murmur, valvular stenosis/regurgitation, or an arteriovenous fistula. It is detected by placing the palm or fingertips lightly over the area and feeling for a buzzing sensation. Bounding pulses, apical impulse strength, and jugular venous pulsation describe different cardiovascular findings and are not defined as thrills.
Category reason: This question tests the definition of a classic cardiovascular physical-exam finding (thrill) related to hemodynamics and turbulent flow, which is foundational cardiovascular science rather than a nursing intervention decision.

Question 23

A visible jugular vein when the head is elevated 45° indicates?

Accepted Answer

Answer reason: At 45° elevation, jugular venous distention reflects elevated right atrial pressure/central venous pressure. This occurs with volume overload or impaired right ventricular pumping, causing venous congestion and visible neck veins. Dehydration and low CVP typically produce flat neck veins. Normal venous return would not usually cause persistent distention at this angle.
Category reason: This question tests interpretation of jugular venous distention as a sign of elevated right-sided filling pressures and volume status, which is core cardiovascular system physiology/pathophysiology rather than a nursing intervention decision.

Question 24

Common radiological sign in ASD is?

Accepted Answer

Answer reason: Left-to-right shunting in atrial septal defect increases pulmonary blood flow, producing pulmonary vascular plethora on chest radiograph. Chronic increased flow can also enlarge the main pulmonary artery segment, making it appear prominent. The other signs correspond to different congenital lesions: boot-shaped heart (TOF), rib notching (coarctation of aorta), and snowman sign (TAPVR).
Category reason: This item tests recognition of a classic chest radiograph finding associated with a congenital heart defect, which is core cardiovascular-system knowledge rather than nursing care prioritization.

Question 25

The ductus venosus shunts blood between:

Accepted Answer

Answer reason: In fetal circulation, the ductus venosus is a hepatic bypass that diverts oxygenated blood from the umbilical vein through the liver to reach systemic venous return with minimal hepatic filtration. It carries blood into the inferior vena cava, allowing higher-oxygen blood to preferentially reach the heart and brain. This shunt closes after birth (functionally within days) as placental flow ceases, becoming the ligamentum venosum.
Category reason: This question tests fetal circulatory shunts and how blood is routed through major vessels, which is core cardiovascular physiology rather than a nursing intervention scenario.

Question 26

In constrictive pericarditis, the inflammation of the pericardium is characterized by all the following, except?

Accepted Answer

Answer reason: Constrictive pericarditis is defined by a rigid, noncompliant pericardium due to chronic inflammation leading to fibrosis, scarring, and thickening, which can cause constriction/contracture of the cardiac chambers. Kussmaul’s sign is a physical examination finding (paradoxical rise in JVP with inspiration) that may occur in constrictive pericarditis, but it is not a structural/pathologic characteristic of pericardial inflammation itself. The other options describe morphologic changes of the pericardium that directly characterize the constrictive process.
Category reason: This question tests recognition of the defining pathophysiologic and structural features of constrictive pericarditis versus a clinical sign, which is primarily cardiovascular disease knowledge rather than nursing intervention or prioritization.

Question 27

The amount of blood flow into one ventricle is dependent on the amount of blood flow into the other ventricle. This is known as..........?

Accepted Answer

Answer reason: The right and left ventricles share the interventricular septum and are constrained together within the pericardium, so changes in filling/pressure in one ventricle can directly affect the other’s diastolic filling and stroke volume. Increased right ventricular volume (e.g., acute pulmonary hypertension) can shift the septum toward the left ventricle, reducing left ventricular preload and output. This coupled behavior of ventricular filling and output is the classic concept being tested.
Category reason: This is a foundational hemodynamics concept about how the two ventricles mechanically influence each other within the pericardial constraint, which is core Cardiovascular System physiology rather than a nursing intervention decision.

Question 28

Which of the following organs contains the ‘Bundle of His’?

Accepted Answer

Answer reason: The Bundle of His is part of the cardiac conduction system, transmitting electrical impulses from the atrioventricular (AV) node to the right and left bundle branches to coordinate ventricular depolarization. This specialized tissue is located in the interventricular septum and is essential for synchronized ventricular contraction. The pancreas, brain, and kidney do not contain this conduction pathway because it is specific to myocardial electrical activity.
Category reason: This question tests knowledge of a specific structure in the heart’s electrical conduction pathway, which is a core topic in the Cardiovascular System.

Question 29

Which precordial area is found at the left 5th intercostal space, midclavicular line?

Accepted Answer

Answer reason: The left 5th intercostal space at the midclavicular line corresponds to the cardiac apex, where the mitral valve sounds are best auscultated. This site is commonly called the apical area and is also where the point of maximal impulse (PMI) is assessed. In contrast, the aortic area is at the right 2nd intercostal space, the pulmonic area is at the left 2nd intercostal space, and Erb's point is at the left 3rd intercostal space.
Category reason: This question tests knowledge of standard cardiac auscultation landmarks (valve areas) on the chest wall, which is foundational cardiovascular anatomy/clinical physiology rather than a nursing intervention decision.

Question 30

A sustained apical impulse palpated in more than one intercostal space suggests:

Accepted Answer

Answer reason: A sustained and laterally displaced point of maximal impulse that spans more than one intercostal space indicates increased left ventricular size and/or workload. Left ventricular hypertrophy or dilation enlarges the cardiac apex and prolongs systolic outward movement, making the impulse broader and more persistent on palpation. Right atrial enlargement typically does not change the apical impulse, and mitral regurgitation is a cause of volume overload but is not the physical finding being directly asked. “Cardiomegaly” is nonspecific, whereas this finding most specifically localizes to the left ventricle.
Category reason: This question tests interpretation of a cardiovascular physical-exam finding (apical impulse) as it relates to underlying chamber enlargement, which is foundational biomedical knowledge in the Cardiovascular System.

Question 31

Why should both carotid arteries not be palpated simultaneously?

Accepted Answer

Answer reason: C. It decreases cerebral blood flow Simultaneous bilateral carotid palpation can mechanically reduce blood flow through both carotid arteries, transiently compromising cerebral perfusion and potentially causing dizziness or syncope. In addition, stimulation of the carotid sinus baroreceptors can trigger an exaggerated vagal response with bradycardia and hypotension, further reducing brain blood flow. Because of this risk, carotid pulses are assessed one side at a time.
Category reason: This question tests the physiologic consequence of carotid artery compression and carotid sinus reflex effects on cerebral perfusion, which is core cardiovascular system knowledge rather than a nursing-priority scenario.

Question 32

Which factor most influences systolic blood pressure?

Accepted Answer

Answer reason: Systolic blood pressure is primarily determined by the volume of blood ejected from the left ventricle during systole and the compliance of the arterial system. Increasing ejected volume raises peak arterial pressure more directly than changes in heart rate alone. Venous return influences preload and can affect ejected volume indirectly, while peripheral venous pressure is not a main determinant of the arterial systolic value.
Category reason: This question tests physiologic determinants of arterial blood pressure and cardiac output rather than a nursing intervention, so it best fits the Cardiovascular System subject area.

Question 33

Which heart sound is best heard at Erb’s point?

Accepted Answer

Answer reason: B. S2 Erb’s point is located at the 3rd left intercostal space along the left sternal border, where the aortic and pulmonic valve sounds are transmitted and compared. The second heart sound is produced by closure of the semilunar valves (aortic and pulmonic), making it most prominent at the base of the heart and adjacent areas such as Erb’s point. In contrast, S1 is typically loudest at the apex (mitral area), and S3/S4 are low-frequency sounds best heard with the bell at the apex or left lower sternal border.
Category reason: This is a foundational cardiac auscultation/anatomy-of-heart-sounds question focused on where S1/S2/S3/S4 are best heard, which fits Cardiovascular System content rather than nursing intervention or prioritization.

Question 34

A pulse that is irregularly irregular is most likely caused by?

Accepted Answer

Answer reason: The hallmark of atrial fibrillation is chaotic atrial electrical activity causing variable AV conduction, which produces completely unpredictable R-R intervals and an “irregularly irregular” pulse. Sinus arrhythmia is irregular but typically has a patterned variation with respiration. Premature atrial contractions usually create an otherwise regular rhythm with occasional early beats, not continuous irregularity. Ventricular tachycardia is generally rapid and more regular (or regularly irregular) rather than classically irregularly irregular.
Category reason: This item tests recognition of a classic cardiac rhythm finding and its underlying arrhythmia, which is foundational cardiovascular knowledge rather than a nursing intervention or prioritization scenario.

Question 35

When assessing a newborn diagnosed with ductus arteriosus, Nurse Olivia should expect that the child most likely would have an?

Accepted Answer

Answer reason: Patent ductus arteriosus creates a continuous left-to-right shunt between the aorta and pulmonary artery, producing a characteristic continuous “machinery” murmur (often best heard at the left upper sternal border/infraclavicular area). Cyanosis is not typical in uncomplicated PDA because systemic blood remains well-oxygenated. Upper-extremity blood pressure changes are more characteristic of coarctation of the aorta rather than PDA.
Category reason: This item tests recognition of a classic congenital heart lesion finding (murmur pattern) and its hemodynamic implications, which is foundational cardiovascular system knowledge rather than a nursing management/prioritization task.

Question 36

What type of blood vessel has the lowest pressure?

Accepted Answer

Answer reason: Blood pressure falls progressively as blood moves away from the heart due to resistance and energy loss along the vascular tree. Arteries and arterioles are high-pressure vessels because they directly receive and regulate flow from ventricular ejection. Capillaries have lower pressure than arterioles to permit exchange, but venules and veins are the lowest-pressure, high-compliance reservoir vessels returning blood to the heart. Therefore the lowest pressure is found in veins.
Category reason: This question tests foundational hemodynamics and pressure changes across vessel types, which is core cardiovascular physiology rather than a nursing intervention or prioritization task.

Question 37

Which of the following statements about the SA node is true?

Accepted Answer

Answer reason: C. It acts as the heart's natural pacemaker The sinoatrial node spontaneously depolarizes at the fastest intrinsic rate in the conduction system, setting the rhythm for the rest of the heart. Its impulses spread through the atria to the atrioventricular node and then to the ventricles via the His-Purkinje system. The SA node is located in the right atrium near the superior vena cava, while the AV node is the structure that delays conduction to allow ventricular filling.
Category reason: This item tests cardiac conduction system physiology (SA node function and location), which is foundational biomedical knowledge within the Cardiovascular System rather than a nursing intervention or prioritization scenario.

Question 38

Which blood vessels regulate blood flow into capillaries?

Accepted Answer

Answer reason: They are the primary resistance vessels and contain substantial smooth muscle that can constrict or dilate to change downstream capillary perfusion. Their tone is influenced by autonomic input and local metabolites, allowing moment-to-moment regulation of tissue blood flow and systemic vascular resistance. Although precapillary sphincters also modulate entry into individual capillary beds, the vessel type that regulates flow into capillaries overall is the arteriolar network.
Category reason: This question tests foundational cardiovascular physiology about which vessel type controls capillary perfusion and peripheral resistance, which fits Cardiovascular System content rather than nursing judgment or interventions.

Question 39

Which artery carries deoxygenated blood?

Accepted Answer

Answer reason: In normal adult circulation, the pulmonary arteries are unique among arteries because they transport blood from the right ventricle to the lungs for gas exchange. This blood has already delivered oxygen to tissues and therefore has low oxygen saturation and higher carbon dioxide content. In contrast, the aorta and systemic arteries (e.g., carotid and renal) typically carry oxygenated blood from the left ventricle to body tissues.
Category reason: This question tests foundational knowledge of systemic versus pulmonary circulation and which major vessels carry oxygenated versus deoxygenated blood, which is a core topic in the Cardiovascular System.

Question 40

What is the primary role of the AV valves?

Accepted Answer

Answer reason: Atrioventricular (mitral and tricuspid) valves close during ventricular systole to stop blood from regurgitating from the ventricles back into the atria. This ensures unidirectional flow through the heart and supports efficient ventricular ejection into the great arteries. Semilunar valves, not AV valves, prevent backflow from the arteries into the ventricles. AV valves do not pump blood or directly regulate systemic blood pressure.
Category reason: This tests the function of cardiac valves and one-way blood flow mechanics, which is core cardiovascular anatomy/physiology knowledge rather than a nursing intervention or prioritization task.

Question 41

Which part of the ECG represents atrial depolarization?

Accepted Answer

Answer reason: A. P wave The P wave corresponds to electrical activation of the atria, which initiates atrial contraction. In contrast, the QRS complex reflects ventricular depolarization, and the T wave reflects ventricular repolarization. The ST segment represents the early phase of ventricular repolarization when the ventricles are uniformly depolarized.
Category reason: This tests interpretation of ECG components and their relation to cardiac electrical activity, which is foundational cardiovascular physiology rather than a nursing intervention/prioritization scenario.

Question 42

Which of the following carries blood away from the heart?

Accepted Answer

Answer reason: Arteries conduct blood away from the heart under higher pressure generated by ventricular contraction. They have thicker, more muscular and elastic walls to withstand and maintain this pressure. In contrast, veins and venules return blood toward the heart, and capillaries are the exchange vessels between arterioles and venules.
Category reason: This question tests foundational knowledge of blood vessel function and systemic circulation, which is part of the Cardiovascular System.

Question 43

Which of the following conditions can cause a widened pulse pressure?

Accepted Answer

Answer reason: Fever increases metabolic demand and typically raises heart rate and cardiac output, often increasing systolic pressure more than diastolic. Systemic vasodilation that can accompany hyperthermia may lower diastolic pressure, further widening the gap. In contrast, hypovolemia usually narrows pulse pressure due to reduced stroke volume, and mitral stenosis tends to reduce forward stroke volume rather than widen pulse pressure. A ventricular septal defect can increase flow states but is not a classic primary cause of widened pulse pressure compared with hyperdynamic states like fever.
Category reason: This asks about a hemodynamic vital-sign pattern (pulse pressure) and how specific physiologic conditions affect systolic vs diastolic blood pressure, which is core cardiovascular physiology.

Question 44

Postural (orthostatic) hypotension is diagnosed when?

Accepted Answer

Answer reason: Orthostatic hypotension is defined by a significant fall in blood pressure upon standing that reflects impaired autonomic/volume compensation. The standard diagnostic threshold is a drop in systolic blood pressure of at least 20 mm Hg or a drop in diastolic blood pressure of at least 10 mm Hg measured within 3 minutes of standing. Smaller systolic decreases (e.g., >10 mm Hg) are not sufficient for diagnosis. A pulse change criterion is not part of the diagnostic definition (though compensatory tachycardia may be assessed clinically).
Category reason: This question tests the diagnostic criteria/definition of an orthostatic blood pressure change, which is a cardiovascular physiology/clinical measurement concept rather than a nursing intervention or prioritization scenario.

Question 45

Which condition most commonly causes postural hypotension in CVD patients?

Accepted Answer

Answer reason: B. Dehydration from diuretics Orthostatic (postural) hypotension most commonly results from reduced intravascular volume leading to inadequate venous return and a drop in blood pressure upon standing. Diuretics are a frequent cause in cardiovascular patients because they can produce volume depletion and sometimes electrolyte losses that blunt compensatory responses. Increased stroke volume would generally support blood pressure rather than lower it. Bradycardia and pulmonary embolism can cause hypotension in specific contexts, but they are less common causes of typical postural hypotension than diuretic-related hypovolemia.
Category reason: This question tests the underlying physiologic cause of orthostatic hypotension in cardiovascular patients (volume depletion/venous return), which is primarily foundational cardiovascular pathophysiology rather than a nursing action or prioritization decision.

Question 46

Which finding would the nurse expect in a client with chronic stable angina?

Accepted Answer

Answer reason: B. pain relieved by nitroglycerin Stable angina is due to transient myocardial ischemia from fixed coronary artery narrowing, typically triggered by exertion or stress and relieved by rest or nitrates. Nitroglycerin decreases myocardial oxygen demand (via venodilation reducing preload) and can improve coronary blood flow, so symptoms usually improve within minutes. Chest pain at rest, ST-segment elevation, and progressively worsening or more frequent pain suggest unstable angina or acute coronary syndrome rather than chronic stable angina.
Category reason: This question tests recognition of typical clinical features of stable angina versus ACS patterns, which is core cardiovascular pathophysiology knowledge rather than a nursing intervention/prioritization decision.

Question 47

What is the most serious complication of atrial fibrillation?

Accepted Answer

Answer reason: Atrial fibrillation causes ineffective atrial contraction and blood stasis, especially in the left atrial appendage, promoting thrombus formation. Embolization of an atrial thrombus to the cerebral circulation can lead to ischemic stroke, which is potentially disabling or fatal. The other choices are common hemodynamic manifestations or symptoms but are generally less catastrophic than thromboembolism.
Category reason: This question tests a key complication and pathophysiologic consequence of a cardiac arrhythmia, which fits best under the Cardiovascular System rather than nursing intervention/priority setting.

Question 48

What is considered a normal adult blood pressure?

Accepted Answer

Answer reason: Normal adult blood pressure is commonly taught as approximately 120/80 mm Hg, reflecting typical systolic pressure during ventricular contraction and diastolic pressure during relaxation. Values like 140/90 mm Hg are used as thresholds for hypertension rather than normal. Readings such as 110/70 mm Hg can be normal for some adults but are not the standard reference value for “normal” in basic teaching. Therefore, the option that best represents normal adult BP is the standard 120/80 mm Hg.
Category reason: This item tests foundational knowledge of normal physiologic cardiovascular parameters (blood pressure norms), rather than a nursing intervention or prioritization decision, so it fits Cardiovascular System under NursingScience.

Question 49

A pulse rate below 60 bpm is termed as?

Accepted Answer

Answer reason: A heart rate below 60 beats per minute meets the standard definition of a slow pulse. Tachycardia refers to an elevated heart rate (typically >100 bpm), and arrhythmia refers to an irregular rhythm rather than a specific rate. Apnea is cessation of breathing, not a pulse-rate abnormality.
Category reason: This question tests the definition of a heart-rate term, which is core cardiovascular physiology/clinical terminology rather than a nursing intervention or prioritization decision.

Question 50

Which of the following is NOT a common cause of postural hypotension?

Accepted Answer

Answer reason: Postural (orthostatic) hypotension commonly results from reduced intravascular volume or impaired autonomic/vascular compensation, and medications are frequent contributors. Diuretics can cause volume depletion, vasodilators reduce systemic vascular resistance, and beta blockers can blunt compensatory tachycardia and reduce cardiac output upon standing. Excessive fluid intake would generally increase intravascular volume and tends to protect against, not cause, orthostatic drops in blood pressure.
Category reason: This item tests causes of orthostatic hypotension and the hemodynamic effects of common cardiovascular medications, which is primarily cardiovascular physiology/pharmacodynamic knowledge rather than a nursing intervention decision.

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