Question 1

Which of the following represents the most correct normal range of central venous pressure?

Accepted Answer

Answer reason: CVP reflects right atrial pressure and is used as an estimate of venous return and right-sided preload. A normal CVP is commonly taught as about 2–6 mmHg (or 3–8 cm H2O), which corresponds roughly to 8–12 cm H2O when expressed in water; many nursing exam items mistakenly present this value in mmHg. Among the provided choices, this range best aligns with the standard “normal CVP” teaching target, whereas the other ranges are too broad or represent clearly elevated values.
Category reason: This item tests factual knowledge of a hemodynamic normal value (central venous pressure), which is foundational cardiovascular physiology rather than a nursing intervention or prioritization scenario.

Question 2

Case 2: Patient: 45-year-old male Presentation: Chest pain x3 hrs, retrosternal, radiating to left arm, sweating, slightly anxious. No cough. Possible Dx:

Accepted Answer

Answer reason: The symptom cluster of prolonged retrosternal chest pain radiating to the left arm with diaphoresis is classic for myocardial ischemia with infarction, especially when lasting >20–30 minutes. Angina is typically shorter and more likely to resolve with rest/nitroglycerin, whereas persistent pain for 3 hours strongly raises concern for infarction. GERD pain is usually burning, related to meals/position, and lacks diaphoresis and arm radiation. Costochondritis is localized, reproducible with palpation or movement, and does not cause autonomic symptoms like sweating.
Category reason: This item tests recognition of a cardiovascular diagnosis based on classic ischemic chest pain features rather than nursing interventions or prioritization, so it fits NursingScience under the Cardiovascular System.

Question 3

Which disease is now known as the “Silent Killer”?

Accepted Answer

Answer reason: It is commonly asymptomatic for years while progressively damaging target organs such as the heart, brain, kidneys, and retina. Because patients often feel well, the condition can remain undiagnosed until complications like stroke, myocardial infarction, heart failure, or chronic kidney disease occur. This silent progression is why routine screening and consistent blood pressure control are essential to reduce morbidity and mortality.
Category reason: This item tests identification of a disease label and its clinical characterization within cardiovascular disorders, which is foundational biomedical knowledge rather than a nursing intervention scenario.

Question 4

Silent Killer refers to:

Accepted Answer

Answer reason: Hypertension is often asymptomatic for years while progressively damaging target organs (heart, brain, kidneys, eyes), which is why it is commonly called the “silent killer.” Without screening, many people remain undiagnosed until complications such as stroke, myocardial infarction, heart failure, or chronic kidney disease occur. Regular blood pressure measurement is therefore essential for early detection and risk reduction.
Category reason: This question tests a foundational disease concept and common clinical descriptor of a cardiovascular condition rather than a nursing intervention or prioritization decision, so it fits Cardiovascular System content.

Question 5

Hypertension is pressure more than?

Accepted Answer

Answer reason: Hypertension has traditionally been defined in many nursing/medical exam contexts as a sustained systolic blood pressure ≥140 mmHg and/or diastolic blood pressure ≥90 mmHg on repeated measurements. Values like 120/80 mmHg are considered normal, while 100/60 and 110/70 mmHg are not hypertensive and may be normal for some individuals. Although newer guidelines may label lower thresholds (e.g., ≥130/80) as hypertension, the classic cutoff tested in many basic MCQs is ≥140/90 mmHg.
Category reason: This question tests the diagnostic threshold value for elevated arterial blood pressure, which is foundational cardiovascular physiology/clinical definitions rather than a nursing intervention or prioritization scenario.

Question 6

What is an automatic deferral for heart valve donation?

Accepted Answer

Answer reason: c. Cardiomyopathy Heart valve donation requires structurally and functionally healthy cardiac tissue to minimize risk of transmitting disease or implanting compromised valves. Cardiomyopathy reflects underlying myocardial pathology that may be associated with abnormal cardiac structure and function, making the valve unsuitable and therefore an automatic deferral. Obesity is not, by itself, a direct valve-tissue contraindication, and a history of cancer is not universally an automatic deferral for valve donation without additional context (type, treatment, remission status).
Category reason: This question tests knowledge of medical contraindications for heart valve tissue donation, which is primarily cardiovascular science rather than a nursing intervention or prioritization scenario.

Question 7

Which fetal vessel becomes the ligamentum arteriosum?

Accepted Answer

Answer reason: C. Ductus arteriosus After birth, rising arterial oxygen tension and falling prostaglandin levels cause functional closure of the ductus arteriosus, which previously shunted blood from the pulmonary artery to the aorta to bypass the fetal lungs. Over weeks, this structure undergoes fibrous remodeling to form the ligamentum arteriosum. By contrast, the ductus venosus becomes the ligamentum venosum, and the umbilical vessels form the medial umbilical ligaments (arteries) and ligamentum teres hepatis (vein).
Category reason: This tests fetal-to-postnatal cardiovascular anatomical remnant changes (ductus arteriosus to ligamentum arteriosum), which is primarily cardiovascular anatomy/physiology knowledge rather than a nursing intervention scenario.

Question 8

What maintains patency of ductus arteriosus in fetal life?

Accepted Answer

Answer reason: In fetal circulation, low arterial oxygen tension keeps the ductus arteriosus relaxed, while prostaglandins (especially PGE2) produced by the placenta and ductal tissue further maintain smooth-muscle dilation. After birth, rising oxygen tension and loss of placental prostaglandin supply promote constriction and eventual closure. High oxygen tension and bradykinin contribute to closure rather than patency, and increased calcium would favor contraction.
Category reason: This is a foundational question about fetal cardiovascular physiology and the biochemical factors controlling ductus arteriosus tone, which is best classified under the Cardiovascular System.

Question 9

What stimulates closure of ductus arteriosus?

Accepted Answer

Answer reason: After birth, rising arterial oxygen tension increases smooth muscle constriction in the ductus arteriosus. At the same time, loss of placental prostaglandin supply and increased pulmonary clearance reduce circulating PGE2, removing its ductal vasodilatory effect. Together these changes promote functional closure within hours, followed by anatomic remodeling over days to weeks. Increased CO2 and decreased pH tend to promote pulmonary vasoconstriction and do not drive ductal closure.
Category reason: This question tests fetal-to-neonatal cardiovascular physiology and the mechanisms controlling closure of the ductus arteriosus, which is primarily cardiovascular system science rather than a nursing intervention scenario.

Question 10

Final anatomical closure of foramen ovale results in:

Accepted Answer

Answer reason: After birth, increased left atrial pressure functionally closes the fetal atrial shunt, and subsequent fibrosis creates a depression in the interatrial septum. This adult remnant is the fossa ovalis in the right atrium. The other choices are remnants of fetal vessels: the ductus venosus becomes ligamentum venosum and the umbilical vein becomes ligamentum teres hepatis. Septum secundum is part of the embryologic septation process, not the named postnatal remnant of the foramen ovale.
Category reason: This question tests knowledge of fetal-to-adult cardiovascular anatomical remnants (foramen ovale closure), which is foundational cardiovascular anatomy/physiology rather than a nursing intervention or clinical decision.

Question 11

Which structure initially directs oxygenated blood from IVC toward foramen ovale?

Accepted Answer

Answer reason: D. Valve of IVC In fetal circulation, the Eustachian valve at the entrance of the inferior vena cava helps guide the most oxygen-rich venous return from the placenta across the right atrium toward the foramen ovale. This preferential streaming supports delivery of better-oxygenated blood to the left atrium and then to the coronary and cerebral circulations. The septum primum and septum secundum form the flap-valve components of the foramen ovale but do not initially direct IVC flow into it. The crista dividens is not the primary fetal flow-directing structure for this pathway.
Category reason: This question tests fetal cardiac anatomy and blood flow pathways, a foundational concept within the cardiovascular system rather than a nursing intervention or safety judgment.

Question 12

The resistance in systemic circulation after birth:

Accepted Answer

Answer reason: With birth and cord clamping, the low-resistance placental circulation is removed from the systemic circuit, which raises systemic vascular resistance. This increases left ventricular afterload and helps shift circulation to the normal postnatal pattern. In contrast, pulmonary vascular resistance falls as the lungs expand and oxygenation increases.
Category reason: This tests physiologic changes in neonatal circulation and vascular resistance after birth, which is foundational cardiovascular physiology rather than a nursing intervention/priority scenario.

Question 13

The nurse is working with a group of community health members to develop a plan to address the special health needs of women. Which of the following conditions would the group address as the major problem?

Accepted Answer

Answer reason: B) Heart disease Cardiovascular disease is the leading cause of death among women in many populations, exceeding deaths from breast cancer and other cancers. Community health planning focused on women’s major health needs therefore prioritizes risk reduction, screening, and early management for this condition. While smoking is a major modifiable risk factor and diabetes is a key comorbidity, they are contributors to the broader cardiovascular burden rather than surpassing it as the primary overall problem.
Category reason: The question tests epidemiologic prioritization of a major disease burden in women, centering on cardiovascular disease as a biomedical health condition rather than a specific nursing intervention scenario.

Question 14

Your patient's telemetry shows a sudden onset of polymorphic ventricular tachycardia. What is the most likely rhythm?

Accepted Answer

Answer reason: Polymorphic ventricular tachycardia classically refers to a twisting QRS morphology around the baseline associated with prolonged repolarization (often prolonged QT). This rhythm is most consistent with torsades, which can be precipitated by QT-prolonging drugs, electrolyte abnormalities (especially hypomagnesemia/hypokalemia), or congenital long-QT syndromes. The other options are supraventricular rhythms or sinus rhythm and do not match a ventricular, polymorphic tachycardia pattern.
Category reason: This item primarily tests recognition of a specific ventricular arrhythmia type (polymorphic VT) and its biomedical classification, which fits cardiovascular foundational knowledge rather than a nursing intervention/prioritization decision.

Question 15

'Pulse Pressure' is a?

Accepted Answer

Answer reason: Pulse pressure is defined as the numerical difference between systolic blood pressure (peak arterial pressure during ventricular contraction) and diastolic blood pressure (lowest arterial pressure during relaxation). It reflects stroke volume and arterial compliance; widened values can occur with stiff arteries or high stroke volume, while narrow values suggest low stroke volume (e.g., shock). The other options incorrectly define it as a single pressure or as a difference not used in standard hemodynamic definitions.
Category reason: This question tests the definition of a hemodynamic blood pressure component, which is foundational cardiovascular physiology rather than a nursing intervention or prioritization task.

Question 16

What is the most common cause of hypertension in adults?

Accepted Answer

Answer reason: Most adult hypertension is primary (essential), meaning no single secondary, reversible cause is identified and it is driven by multifactorial genetic and environmental influences (e.g., age, obesity, dietary sodium, inactivity). Secondary causes like renal artery stenosis, pheochromocytoma, and coarctation of the aorta are important but account for a much smaller proportion of adult cases. Therefore, when asked for the most common cause in adults, primary hypertension is the best answer.
Category reason: This is testing epidemiology/etiology of hypertension rather than a nursing intervention or prioritization decision, so it fits foundational cardiovascular knowledge.

Question 17

What pathophysiological process is responsible for the edema in heart failure?

Accepted Answer

Answer reason: Reduced pump function leads to elevated venous hydrostatic pressure, especially in the systemic circulation with right-sided involvement, which drives fluid out of capillaries into the interstitial space. This fluid shift causes dependent or peripheral edema. While neurohormonal activation (e.g., RAAS) can worsen fluid retention, the primary mechanism of edema formation in heart failure is venous congestion increasing hydrostatic pressure rather than increased permeability or lymphatic blockage.
Category reason: This item tests the mechanism of edema formation in heart failure (hemodynamics and fluid shifts), which is foundational cardiovascular pathophysiology rather than a nursing intervention or prioritization decision.

Question 18

If the foramen ovale remains patent after birth, it may cause?

Accepted Answer

Answer reason: A patent foramen ovale can allow intermittent right-to-left shunting when right atrial pressure transiently exceeds left atrial pressure (e.g., with coughing or Valsalva). This creates a pathway for venous thrombi to bypass the pulmonary capillary filter and enter the arterial circulation. The clinical consequence is risk of embolic stroke or other systemic arterial emboli. The other options are not the characteristic complication directly attributable to this fetal interatrial communication.
Category reason: This question tests congenital cardiac anatomy/physiology and its pathophysiologic complication, which is best categorized under the Cardiovascular System rather than nursing care decision-making.

Question 19

In fetal life, blood returning from the head and upper body drains into:

Accepted Answer

Answer reason: B. Right ventricle via SVC In fetal circulation, venous return from the head and upper extremities enters the right atrium through the superior vena cava. Because this blood is relatively less oxygenated, it is preferentially directed across the tricuspid valve into the right ventricle and then into the pulmonary artery, with most bypassing the lungs via the ductus arteriosus. In contrast, the more oxygenated blood from the placenta enters via the inferior vena cava and is preferentially streamed across the foramen ovale into the left atrium.
Category reason: This tests fetal cardiovascular circulation pathways (how blood returns via SVC/IVC and is routed through fetal shunts), which is foundational anatomy/physiology of the cardiovascular system rather than a nursing intervention or safety decision.

Question 20

What fetal condition may result if the ductus arteriosus fails to close postnatally?

Accepted Answer

Answer reason: Failure of ductus arteriosus closure leads to a patent ductus arteriosus with a left-to-right shunt from the aorta into the pulmonary artery. This increases pulmonary blood flow and returns excess volume to the left atrium and ventricle, producing volume overload. Over time, the heart may be unable to compensate, resulting in signs of heart failure such as tachypnea, poor feeding, and growth failure. Cyanosis is not typical early because systemic blood is still well oxygenated until late shunt reversal (Eisenmenger).
Category reason: This is a foundational question about a fetal cardiac structure (ductus arteriosus) and the physiologic consequences when it remains patent after birth, which primarily tests cardiovascular pathophysiology rather than nursing interventions.

Question 21

The adult remnant of the ductus venosus is called?

Accepted Answer

Answer reason: The ductus venosus is a fetal shunt that carries oxygenated blood from the umbilical vein to the inferior vena cava, bypassing much of the hepatic circulation. After birth, closure of this vessel leaves a fibrous band within the liver. This structure is termed the ligamentum venosum. The other options are remnants of different fetal structures (ductus arteriosus, foramen ovale, and umbilical vein).
Category reason: This question tests knowledge of fetal-to-adult circulatory remnants and their adult anatomical names, which is part of cardiovascular anatomy and physiology rather than nursing intervention/priority decisions.

Question 22

In fetal circulation, which chamber receives the most oxygenated blood?

Accepted Answer

Answer reason: Oxygenated blood from the placenta returns via the umbilical vein and ductus venosus into the inferior vena cava, which delivers it primarily into the right atrium. Streaming across the foramen ovale directs much of this relatively well-oxygenated blood toward the left atrium and left ventricle for preferential delivery to the brain and coronary circulation. However, the initial cardiac chamber that receives this highest-oxygen-content venous return is the right atrium, before it is shunted.
Category reason: This tests knowledge of fetal cardiovascular shunts and the path of oxygenated placental blood through the fetal heart, which is a foundational concept in the Cardiovascular System.

Question 23

If oxygen saturation falls in fetal life, what happens to ductus arteriosus?

Accepted Answer

Answer reason: Fetal ductus arteriosus patency is promoted by low arterial oxygen tension and prostaglandins. When fetal oxygen saturation falls, smooth muscle in the ductus relaxes, increasing shunting from the pulmonary artery to the aorta to bypass the high-resistance fetal lungs. In contrast, rising oxygen tension after birth triggers functional constriction and eventual anatomic closure.
Category reason: This tests physiologic regulation of fetal circulation and oxygen-dependent changes in the ductus arteriosus, which is core Cardiovascular System content rather than a nursing intervention scenario.

Question 24

A "right aortic arch" on chest X-ray suggests:

Accepted Answer

Answer reason: A right-sided aortic arch is a classic radiographic association with congenital conotruncal defects, especially tetralogy of Fallot. In TOF, the aorta often overrides the ventricular septum and may arch to the right due to altered embryologic development of the aortic arch system. PDA, ASD, and isolated VSD are not characteristically linked to a right aortic arch on chest X-ray.
Category reason: This question tests recognition of a congenital cardiac anomaly association on imaging (right aortic arch), which is foundational cardiovascular disease knowledge rather than a nursing intervention decision.

Question 25

In TOF, what causes cyanosis?

Accepted Answer

Answer reason: B. Obstruction to pulmonary blood flow Decreased pulmonary blood flow from right ventricular outflow tract obstruction reduces blood oxygenation in the lungs. This promotes right-to-left shunting across the ventricular septal defect, allowing deoxygenated blood to enter systemic circulation. The resulting systemic hypoxemia manifests clinically as cyanosis. The other choices do not represent the primary mechanism of cyanosis in tetralogy of Fallot.
Category reason: This question tests the pathophysiologic mechanism of cyanosis in tetralogy of Fallot, a congenital cardiac defect, which is primarily cardiovascular science knowledge rather than a nursing intervention or prioritization scenario.

Question 26

What type of shunt is seen in truncus arteriosus?

Accepted Answer

Answer reason: With truncus arteriosus, a single arterial trunk supplies systemic, pulmonary, and coronary circulations, typically with an associated large VSD that allows complete mixing of oxygenated and deoxygenated blood. Because pulmonary and systemic vascular resistances can be similar early in life and may change dynamically, flow can occur in either direction across the VSD/outflow pathway. As pulmonary vascular resistance rises over time, the net flow may shift toward more right-to-left physiology, but the fundamental defect produces mixing and potential two-way flow. Therefore the shunting is best described as bidirectional.
Category reason: This tests congenital cardiac physiology and circulation patterns (direction of shunting) rather than a nursing intervention or prioritization decision, so it fits Cardiovascular System under NursingScience.

Question 27

Which condition is an indication for urgent surgical closure of VSD?

Accepted Answer

Answer reason: This presentation indicates a hemodynamically significant left-to-right shunt causing pulmonary overcirculation and symptomatic heart failure. Failure to thrive reflects inadequate systemic perfusion and high metabolic demand from CHF, signaling that medical therapy alone may be insufficient. Urgent closure is considered to prevent ongoing heart failure, pulmonary vascular disease, and poor growth. Small restrictive or asymptomatic muscular defects often close spontaneously or can be managed expectantly.
Category reason: This question tests biomedical understanding of when a ventricular septal defect becomes clinically significant enough to require surgical closure, which is core congenital heart disease management within the Cardiovascular System.

Question 28

Which drug is used to close a PDA?

Accepted Answer

Answer reason: It is a nonsteroidal anti-inflammatory drug that inhibits cyclooxygenase, reducing prostaglandin synthesis. Lower prostaglandin levels promote constriction and functional closure of the ductus arteriosus in a patent ductus arteriosus, especially in preterm infants. In contrast, prostaglandin E1 is used to keep the ductus open in certain congenital heart defects, and propranolol/dopamine do not close PDA.
Category reason: This question tests drug-based management of a congenital cardiac shunt (PDA) and the physiologic role of prostaglandins in ductal patency, which is best categorized under the Cardiovascular System.

Question 29

Which of the following lesions causes cyanosis without murmur?

Accepted Answer

Answer reason: Transposition of the great arteries classically produces profound central cyanosis early because systemic and pulmonary circulations run in parallel, so oxygenated blood does not adequately reach the systemic circulation without mixing. A prominent murmur is often absent because there may be no significant outflow obstruction or turbulent flow across valves. In contrast, TOF typically has a harsh systolic murmur from right ventricular outflow obstruction, and VSD/PDA usually create murmurs from left-to-right shunting when pulmonary vascular resistance falls.
Category reason: This is a congenital heart disease identification question focused on pathophysiology and clinical findings (cyanosis and murmurs), which fits Cardiovascular System foundational science rather than nursing intervention/priority decisions.

Question 30

Common finding in ECG of atrial septal defect (ostium secundum)?

Accepted Answer

Answer reason: Ostium secundum ASD causes a chronic left-to-right shunt leading to right atrial and right ventricular volume overload. This commonly produces right-axis deviation/right ventricular hypertrophy patterns and an incomplete right bundle branch block on ECG due to right-sided conduction delay from chamber enlargement. Left axis deviation is more typical of ostium primum ASD/AV canal defects rather than secundum ASDs. Short PR interval suggests pre-excitation (e.g., WPW) and is not a typical ASD finding.
Category reason: This question tests recognition of characteristic ECG findings associated with a congenital heart defect, which is foundational cardiovascular pathophysiology/diagnostics rather than a nursing intervention decision.

Question 31

Which heart lesion is associated with Turner syndrome?

Accepted Answer

Answer reason: C. Coarctation of aorta Turner syndrome (45,X) has a classic association with left-sided congenital heart defects, most notably coarctation of the aorta and bicuspid aortic valve. Coarctation causes obstruction to aortic blood flow, leading to upper-extremity hypertension and diminished/delayed femoral pulses. The other options are more commonly linked with different genetic conditions (e.g., TOF and truncus arteriosus with 22q11 deletion).
Category reason: This is a foundational association question about congenital cardiac lesions linked to a chromosomal syndrome, which is primarily biomedical knowledge within the cardiovascular system rather than a nursing intervention or prioritization scenario.

Question 32

Blalock-Taussig shunt is used in the management of?

Accepted Answer

Answer reason: It is a palliative systemic-to-pulmonary artery shunt that increases pulmonary blood flow to improve oxygenation in cyanotic congenital heart disease. This is classically used in tetralogy of Fallot, especially when definitive repair is delayed or the infant has severe cyanosis (“tet spells”). The shunt provides an alternate route to deliver blood to the lungs, reducing hypoxemia until complete surgical correction is performed.
Category reason: This question tests knowledge of a specific congenital cardiac surgical shunt and which heart defect it treats, which is primarily cardiovascular disease management knowledge rather than a nursing intervention scenario.

Question 33

Continuous machinery murmur is characteristic of?

Accepted Answer

Answer reason: A continuous “machine-like” murmur classically occurs when there is persistent flow from a higher-pressure vessel to a lower-pressure vessel throughout both systole and diastole. In patent ductus arteriosus, blood shunts from the aorta to the pulmonary artery across the persistent ductus, producing continuous turbulence. By contrast, ASD and VSD more typically produce systolic murmurs, and coarctation is associated with murmurs/bruits related to turbulent flow across the narrowed aorta rather than a classic continuous machinery murmur.
Category reason: This is testing recognition of a classic cardiac auscultation finding and its associated congenital heart lesion, which is foundational cardiovascular pathophysiology rather than a nursing intervention scenario.

Question 34

The best initial diagnostic modality for CHD in neonates is?

Accepted Answer

Answer reason: It is the first-line test for suspected congenital heart disease in neonates because it is noninvasive, rapid, and provides real-time assessment of cardiac anatomy and hemodynamics (septal defects, outflow obstruction, shunts). It can be performed at the bedside without ionizing radiation, which is important in newborns. Chest X-ray is supportive but nonspecific, while CT and MRI are typically reserved for problem-solving or preoperative planning due to sedation/transport needs and (for CT) radiation exposure.
Category reason: This item tests the preferred diagnostic method for congenital heart disease in a newborn, which is core cardiovascular evaluation knowledge rather than a nursing intervention or prioritization scenario.

Question 35

The only CHD that results in reversal of shunt from left-to-right to right-to-left due to pulmonary hypertension is?

Accepted Answer

Answer reason: A. Eisenmenger syndrome A long-standing left-to-right shunt (commonly from a large VSD, ASD, or PDA) can chronically increase pulmonary blood flow and trigger progressive pulmonary vascular remodeling. This leads to pulmonary hypertension with rising pulmonary vascular resistance until it exceeds systemic resistance, causing shunt reversal to right-to-left and resulting in cyanosis. This pathophysiologic sequence is termed Eisenmenger syndrome. TOF is a primary right-to-left shunt from birth rather than a reversal driven by pulmonary hypertension.
Category reason: This question tests the pathophysiology of congenital heart disease and pulmonary vascular changes leading to shunt reversal, which is core cardiovascular system science rather than a nursing intervention/priority scenario.

Question 36

The most common CHD detected in infancy is?

Accepted Answer

Answer reason: Ventricular septal defect is the most common congenital heart defect overall and is frequently identified during infancy due to a characteristic murmur and, when moderate-to-large, signs of pulmonary overcirculation and heart failure. PDA and ASD are also common lesions, but ASD is often detected later because it can be clinically silent in early life. Tetralogy of Fallot is a common cyanotic defect but is not the most common CHD overall.
Category reason: This question tests epidemiology/recognition of congenital cardiac defects, which is foundational knowledge within the Cardiovascular System rather than a nursing intervention or prioritization scenario.

Question 37

Cyanosis in the first 24 hours of life that does not improve with oxygen is a feature of?

Accepted Answer

Answer reason: Cyanosis in the first day of life that shows minimal or no response to supplemental oxygen strongly suggests a cyanotic congenital heart disease with right-to-left shunting. In transposition of the great arteries, systemic and pulmonary circulations run in parallel, so oxygenated blood does not effectively reach the systemic circulation unless there is mixing (e.g., PDA/ASD/VSD). By contrast, primary pulmonary causes like pneumonia or RDS typically show at least partial improvement in oxygenation with oxygen therapy. Early recognition is critical because management may require prostaglandin E1 to maintain ductal patency and urgent cardiology intervention.
Category reason: This item tests recognition of a congenital cardiac lesion based on neonatal oxygen non-responsiveness, which is primarily cardiovascular pathophysiology rather than a nursing intervention decision.

Question 38

All of the following are part of Tetralogy of Fallot except?

Accepted Answer

Answer reason: Tetralogy of Fallot classically includes ventricular septal defect, right ventricular hypertrophy, overriding aorta, and right ventricular outflow tract obstruction (most commonly pulmonary stenosis). Aortic stenosis is a distinct congenital lesion involving narrowing at the aortic valve/outflow and is not one of the four defining components. The aortic abnormality in this tetrad is an overriding aorta, not stenosis.
Category reason: This tests recognition of the defining structural components of a congenital heart defect, which is foundational cardiovascular disease knowledge rather than a nursing care decision.

Question 39

Which cyanotic CHD has “single S2” heart sound?

Accepted Answer

Answer reason: B. TOF A single S2 in cyanotic congenital heart disease is classically associated with Tetralogy of Fallot because the pulmonary component (P2) is diminished or absent due to severe right ventricular outflow tract obstruction/pulmonary stenosis. This reduces the intensity of P2, leaving a single, loud aortic component (A2) on auscultation. In contrast, TGA often has a loud single S2 but is typically described as single loud S2 without the classic association tested here, and truncus arteriosus/TAPVR usually have different characteristic findings (e.g., murmurs from increased flow or shunts).
Category reason: This item tests recognition of a characteristic heart sound finding linked to a specific congenital cardiac lesion, which is foundational cardiovascular pathophysiology rather than a nursing management decision.

Question 40

“Boot-shaped heart” is radiological hallmark of?

Accepted Answer

Answer reason: The “boot-shaped” cardiac silhouette on chest X-ray classically results from right ventricular hypertrophy with an upturned cardiac apex and a concave main pulmonary artery segment due to pulmonary stenosis. This combination is characteristic of Tetralogy of Fallot, which includes RV outflow obstruction, RV hypertrophy, overriding aorta, and VSD. In contrast, TGA more often shows an “egg-on-a-string” appearance, VSD alone lacks this specific silhouette, and truncus arteriosus typically presents with cardiomegaly and increased pulmonary vascular markings rather than a boot shape.
Category reason: This question tests recognition of a classic imaging-associated finding of a congenital heart defect, which is foundational cardiovascular disease knowledge rather than a nursing intervention or prioritization scenario.

Question 41

Which of the following is not a component of Tetralogy of Fallot?

Accepted Answer

Answer reason: Tetralogy of Fallot classically consists of ventricular septal defect, right ventricular outflow tract obstruction (pulmonary stenosis), overriding aorta, and right ventricular hypertrophy. The hypertrophy occurs in the right ventricle due to increased resistance to outflow. Left ventricular hypertrophy is not part of the defining tetrad.
Category reason: This is a foundational congenital heart disease knowledge question focused on the defining cardiac structural features of Tetralogy of Fallot, which falls under the Cardiovascular System.

Question 42

Cyanosis in newborn with CHD that increases with crying indicates:

Accepted Answer

Answer reason: Crying increases oxygen demand and can worsen right-to-left shunting when pulmonary blood flow is limited, leading to more systemic desaturation and visible cyanosis. Left-to-right shunts (such as VSD and PDA) typically do not cause early cyanosis because blood is shunted to the lungs and systemic arterial oxygenation is preserved initially. Therefore, cyanosis that becomes more prominent with agitation suggests a cyanotic congenital heart lesion with right-to-left physiology.
Category reason: This question tests recognition of congenital heart disease physiology (right-to-left vs left-to-right shunts) and how it affects oxygenation and cyanosis, which is foundational cardiovascular pathophysiology rather than a nursing intervention decision.

Question 43

The most likely heart sound in a large VSD is?

Accepted Answer

Answer reason: A large VSD with significant left-to-right shunting can lead to increased pulmonary blood flow and development of pulmonary hypertension. Elevated pulmonary artery pressure causes earlier closure of the pulmonic valve (P2), which reduces the normal respiratory variation in splitting of S2 and can make S2 narrowly split or even single. In contrast, wide splitting is classically seen with delayed P2 (e.g., pulmonic stenosis, RBBB), and an ejection click suggests semilunar valve stenosis or abnormal valve anatomy rather than VSD itself.
Category reason: This question tests recognition of auscultatory heart sound changes associated with congenital cardiac shunts and their hemodynamic consequences, which is foundational cardiovascular pathophysiology rather than a nursing intervention scenario.

Question 44

What is the typical presentation age of large PDA in infants?

Accepted Answer

Answer reason: As pulmonary vascular resistance falls over the first several weeks of life, a large left-to-right shunt through a PDA increases. This leads to signs of congestive heart failure such as tachypnea, poor feeding, diaphoresis, and failure to thrive that typically become evident around 3–6 weeks. At birth or within 48 hours is more consistent with duct-dependent lesions or transitional physiology rather than the classic timing of symptomatic large PDA. Presentation at 6–12 months is more typical of smaller shunts or delayed recognition.
Category reason: This tests knowledge of the pathophysiology and clinical timing of symptoms from a congenital cardiac shunt (PDA) as pulmonary vascular resistance drops, which is core cardiovascular-system science rather than a nursing intervention or prioritization decision.

Question 45

Best non-invasive investigation for assessing pulmonary hypertension in CHD?

Accepted Answer

Answer reason: It allows noninvasive estimation of pulmonary artery pressure by measuring tricuspid regurgitation jet velocity and applying the Bernoulli equation, and it can also assess right ventricular size/function. In congenital heart disease, it additionally characterizes shunt lesions and related hemodynamic consequences that contribute to elevated pulmonary pressures. ECG and chest X-ray only provide indirect signs of pulmonary hypertension, and pulse oximetry assesses oxygenation rather than pulmonary artery pressure.
Category reason: This is primarily about the best diagnostic test to assess pulmonary hypertension physiology/hemodynamics in congenital heart disease, which fits cardiovascular system diagnostics rather than nursing care decisions.

Question 46

Child with machinery murmur and bounding pulses. Most likely diagnosis?

Accepted Answer

Answer reason: A continuous “machinery” murmur classically results from persistent flow between the aorta and pulmonary artery throughout systole and diastole. Left-to-right shunting increases pulse pressure due to diastolic runoff into the pulmonary circulation, producing bounding pulses. VSD and ASD typically cause systolic murmurs (VSD holosystolic; ASD fixed split S2 with systolic ejection murmur) rather than a continuous machinery murmur. Tricuspid regurgitation is also primarily holosystolic and does not explain bounding pulses in this classic way.
Category reason: This is testing recognition of a classic congenital heart defect presentation (murmur type and pulse findings), which is core cardiovascular pathophysiology/diagnosis rather than nursing intervention or prioritization.

Question 47

Which of the following best describes the circulatory pattern in the fetus?

Accepted Answer

Answer reason: In fetal life, the right and left ventricles function largely in parallel rather than strictly in series, because shunts (foramen ovale and ductus arteriosus) allow mixing and redistribution of blood between the systemic and pulmonary outflows. Most right ventricular output bypasses the high-resistance fetal lungs via the ductus arteriosus into the aorta, while the left ventricle preferentially supplies the upper body. This arrangement optimizes oxygen delivery from the placenta and minimizes flow to the nonventilated lungs.
Category reason: This asks about the physiologic organization of fetal blood flow and cardiac output distribution, which is a cardiovascular physiology concept rather than a nursing intervention or care priority.

Question 48

Fetal blood is returned to the umbilical arteries and the placenta through the?

Accepted Answer

Answer reason: The umbilical arteries arise from the internal iliac (hypogastric) arteries and carry deoxygenated fetal blood away from the fetus back to the placenta for gas exchange. In contrast, the ductus venosus shunts oxygenated blood from the umbilical vein toward the inferior vena cava, the foramen ovale shunts blood right-to-left between atria, and the ductus arteriosus shunts from the pulmonary artery to the aorta. Therefore, the vessel pathway returning blood to the placenta is via the hypogastric (internal iliac) arteries.
Category reason: This tests fetal circulation anatomy—specifically the vascular pathways connecting fetal systemic circulation to the placenta—making it foundational cardiovascular knowledge rather than a nursing intervention scenario.

Question 49

Ebstein anomaly is associated with exposure to?

Accepted Answer

Answer reason: Teratogenic exposure in early pregnancy is classically linked to congenital heart defects, and this medication is associated with Ebstein anomaly (malformation of the tricuspid valve with atrialization of the right ventricle). By contrast, warfarin is associated with fetal warfarin syndrome (nasal hypoplasia, stippled epiphyses) and CNS abnormalities, phenytoin with fetal hydantoin syndrome, and ACE inhibitors with fetal renal dysgenesis/oligohydramnios (especially later in pregnancy). Therefore, among the listed options, this exposure best matches Ebstein anomaly.
Category reason: This is a teratogen-to-congenital cardiac defect association question, emphasizing cardiovascular embryologic outcomes rather than nursing interventions, so it fits Cardiovascular System within NursingScience.

Question 50

Total anomalous pulmonary venous return (TAPVR) requires survival through:

Accepted Answer

Answer reason: In TAPVR, pulmonary venous blood returns to the right atrium/systemic venous circulation instead of the left atrium, so oxygenated blood cannot reach the left heart unless there is an interatrial communication. An ASD (or a patent foramen ovale functionally) allows mixing and passage of blood from the right atrium to the left atrium, permitting systemic cardiac output. Without this right-to-left shunt at the atrial level, the left ventricle is underfilled and systemic perfusion becomes incompatible with life. PDA and VSD do not reliably provide the necessary route for oxygenated pulmonary venous blood to reach the left atrium for effective systemic circulation.
Category reason: This is a congenital heart defect question testing the circulatory pathway and required shunt physiology, which falls under the Cardiovascular System subject rather than nursing interventions or prioritization.

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