Heart Failure in Children — MCQs
Cardiotoxicity caused by radiotherapy & chemotherapy is best detected by
Which of these acyanotic congenital heart diseases is associated with volume overload?
Which beta-1 antagonist is used in congestive cardiac failure?
Which medication is commonly used in heart failure that also has aldosterone antagonistic properties?
A one month old infant with a congenital cardiac lesion shows increased sweating during feeding. Which of the following is the sure sign of congestive cardiac failure in this infant?
Which of the following is the best inotrope agent for use in right heart failure secondary to pulmonary hypertension?
In children, which of the following is a key diagnostic sign of congestive heart failure (CHF)?
What is the most common ASD in Down syndrome?
Which of the following is least likely in PDA?
A 2-month-old infant is brought to the clinic because of poor feeding, sweating, and difficulty breathing. The parents state that she was doing very well, and has actually been a "very easy going baby", until about a week ago. They assumed that she was developing a "cold", but it has not passed, and the symptoms have been worsening. Cardiac examination reveals a loud, harsh systolic murmur with a thrill that is heard best at the left sternal border. The most likely underlying abnormality is
Heart Failure in Children Indian Medical PG Practice Questions and MCQs
Question 1: Cardiotoxicity caused by radiotherapy & chemotherapy is best detected by
- A. ECHO (Correct Answer)
- B. Endomyocardial Biopsy
- C. ECG
- D. Radionuclide Scan
Explanation: ***ECHO*** - **Echocardiography (ECHO)** is the primary and most widely used non-invasive method for detecting cardiotoxicity due to its ability to assess **left ventricular ejection fraction (LVEF)**, a key indicator of cardiac function, and structural changes. - It is crucial for **baseline assessment**, monitoring during treatment, and follow-up, identifying both systolic and diastolic dysfunction effectively. *Endomyocardial Biopsy* - While **endomyocardial biopsy** is considered the gold standard for definitive diagnosis of some cardiomyopathies (e.g., myocarditis), it is **invasive** and carries risks such as perforation, tamponade, and arrhythmias. - It is usually reserved for cases where other non-invasive tests are inconclusive and there's a strong clinical suspicion of severe cardiac disease, or for research, not routine monitoring of cardiotoxicity. *ECG* - An **ECG** can detect arrhythmias and ischemic changes but is **not sensitive or specific** enough to reliably detect early or subtle changes in cardiac function characteristic of cardiotoxicity. - It may show changes secondary to heart failure, but it does not directly measure ejection fraction or assess overall cardiac mechanical function. *Radionuclide Scan* - **Radionuclide scans**, specifically **MUGA (Multigated Acquisition)** scans, can accurately measure **LVEF** and are an alternative to ECHO, particularly when ECHO images are suboptimal [1]. - However, they involve **radiation exposure**, making them less ideal for frequent monitoring compared to echocardiography, especially in cancer patients who are already exposed to radiation.
Question 2: Which of these acyanotic congenital heart diseases is associated with volume overload?
- A. Aortic stenosis
- B. None of the options
- C. Ventricular septal defect (Correct Answer)
- D. Coarctation of aorta
Explanation: ***Ventricular septal defect*** - A **ventricular septal defect (VSD)** causes a left-to-right shunt, leading to increased blood flow to the **pulmonary circulation** and the left side of the heart [1]. - This increased blood flow results in a **volume overload state** for the left atrium and left ventricle [1]. *Aortic stenosis* - **Aortic stenosis (AS)** is characterized by an obstruction to outflow from the left ventricle, leading to **pressure overload** on the left ventricle, not volume overload. - While prolonged AS can cause left ventricular hypertrophy, it doesn't primarily cause the type of volume overload seen with shunts. *None of the options* - This option is incorrect because **ventricular septal defect** is a specific acyanotic congenital heart disease that causes significant volume overload [1]. - **VSDs** are a classic example of conditions leading to increased pulmonary blood flow and chamber dilation due to shunting [1]. *Coarctation of aorta* - **Coarctation of the aorta** is a narrowing of the aorta, primarily causing **pressure overload** in the left ventricle due to increased resistance to systemic blood flow. - It does not cause a shunt or increased pulmonary blood flow, thus not leading to volume overload in the same way as VSD.
Question 3: Which beta-1 antagonist is used in congestive cardiac failure?
- A. Atenolol
- B. Metoprolol (Correct Answer)
- C. Esmolol
- D. Bisoprolol
Explanation: ***Metoprolol*** - **Metoprolol succinate** (extended-release formulation) is a selective **beta-1 antagonist** proven to reduce mortality and hospitalizations in **chronic heart failure with reduced ejection fraction (HFrEF)**. - It works by **reducing heart rate, myocardial oxygen demand**, and preventing adverse cardiac remodeling through inhibition of chronic sympathetic activation. - Along with **bisoprolol and carvedilol**, it is one of the **three beta-blockers with proven mortality benefit** in heart failure trials. *Atenolol* - While atenolol is a selective beta-1 antagonist, it **lacks evidence for mortality benefit** in heart failure. - It has **high hydrophilicity** and renal elimination, leading to less favorable pharmacokinetics compared to metoprolol. - More commonly used for **hypertension and angina** rather than heart failure management. *Esmolol* - **Esmolol** is an ultra-short-acting selective beta-1 antagonist used for **acute control of heart rate** in perioperative and critical care settings. - Its **very short half-life (9 minutes)** makes it unsuitable for chronic management of heart failure. - Administered only **intravenously** and requires continuous infusion. *Bisoprolol* - While **bisoprolol is also approved** for heart failure and has proven mortality benefit (CIBIS-II trial), this question likely expects **metoprolol** as the answer given the historical context. - Both bisoprolol and metoprolol are acceptable answers, but **metoprolol** has been more widely studied and is more commonly cited in Indian medical exams. - Bisoprolol has **greater beta-1 selectivity** than metoprolol but similar clinical outcomes in heart failure.
Question 4: Which medication is commonly used in heart failure that also has aldosterone antagonistic properties?
- A. Carvedilol
- B. Spironolactone (Correct Answer)
- C. Abiraterone
- D. Sacubitril/Valsartan
Explanation: ***Spironolactone*** - **Spironolactone** is a **potassium-sparing diuretic** that acts as a **competitive antagonist of aldosterone** receptors, primarily in the collecting ducts of the kidneys. - This action leads to increased excretion of sodium and water, and retention of potassium, which is beneficial in **heart failure** by reducing fluid overload and mitigating the detrimental effects of aldosterone on cardiac remodeling. *Carvedilol* - **Carvedilol** is a **beta-blocker** with additional **alpha-1 blocking** properties, commonly used in heart failure to reduce heart rate, blood pressure, and myocardial oxygen demand. - It does not possess significant aldosterone antagonistic properties. *Sacubitril/Valsartan* - **Sacubitril/Valsartan** is an **angiotensin receptor-neprilysin inhibitor (ARNI)**. Valsartan is an **angiotensin receptor blocker (ARB)**, and sacubitril inhibits neprilysin, an enzyme that degrades natriuretic peptides. - While it modulates the **renin-angiotensin-aldosterone system (RAAS)** and is highly effective in heart failure, it does not directly antagonize aldosterone receptors. *Abiraterone* - **Abiraterone** is an **androgen-biosynthesis inhibitor** used in the treatment of **prostate cancer**. - Its primary mechanism involves inhibiting **CYP17**, an enzyme critical for androgen production, and it has no role in the management of heart failure or aldosterone antagonism.
Question 5: A one month old infant with a congenital cardiac lesion shows increased sweating during feeding. Which of the following is the sure sign of congestive cardiac failure in this infant?
- A. JVP
- B. Basal crepitations
- C. Liver enlargement (Correct Answer)
- D. Pedal oedema
Explanation: ***Liver enlargement*** - **Hepatomegaly** is a **cardinal sign** of **congestive cardiac failure** in infants due to venous congestion and fluid retention. - The infant's immature lymphatic system and pliable chest wall make other signs less reliable, while the liver quickly reflects increased systemic venous pressure. *JVP* - **Jugular venous pressure (JVP)** is notoriously difficult to assess accurately in infants due to their short necks and poorly developed neck muscles. - Therefore, it is **not a reliable indicator** of congestive cardiac failure in this age group. *Basal crepitations* - **Basal crepitations**, indicating pulmonary edema, can be a sign but are often subtle and can also be present in other respiratory conditions prevalent in infants. - The infant's small lung fields and rapid respiratory rate make the detection of crepitations challenging and less specific than liver enlargement. *Pedal oedema* - **Pedal edema** is less common in infants with congestive heart failure because they tend to retain fluid in the **extracellular space**, leading to generalized edema rather than localized peripheral swelling. - The distribution of fluid retention in infants often manifests as puffiness around the eyes or generalized anasarca rather than prominent pedal edema.
Question 6: Which of the following is the best inotrope agent for use in right heart failure secondary to pulmonary hypertension?
- A. Milrinone (Correct Answer)
- B. Dobutamine
- C. Digoxin
- D. Dopamine
Explanation: ***Milrinone*** - Milrinone is a **phosphodiesterase-3 inhibitor** that increases myocardial contractility and causes **pulmonary and systemic vasodilation**. - Its vasodilatory effect is particularly beneficial in **pulmonary hypertension** as it can help reduce **pulmonary vascular resistance (PVR)**, a critical factor in right heart failure. - The combination of **positive inotropy** and **selective pulmonary vasodilation** makes it the optimal choice for right ventricular failure secondary to pulmonary hypertension. *Dobutamine* - Dobutamine is a **beta-1 agonist** that primarily increases myocardial contractility with some beta-2 mediated vasodilation. - While it improves cardiac output, its lesser effect on **pulmonary vascular resistance** compared to milrinone makes it less ideal for right heart failure specifically complicated by pulmonary hypertension. *Digoxin* - Digoxin is a **cardiac glycoside** that increases contractility but has a slow onset of action and a narrow therapeutic window, making it less suitable for acute management. - It does not significantly reduce **pulmonary vascular resistance** and is primarily used for chronic heart failure or rate control in atrial fibrillation. *Dopamine* - Dopamine is a **catecholamine** with dose-dependent effects: at moderate doses (5-10 mcg/kg/min), it acts as a **beta-1 agonist** providing inotropic support. - However, at higher doses it causes **alpha-adrenergic vasoconstriction** which can **increase pulmonary vascular resistance**, potentially worsening right heart failure in pulmonary hypertension. - Unlike milrinone, it lacks specific pulmonary vasodilatory properties beneficial for reducing RV afterload.
Question 7: In children, which of the following is a key diagnostic sign of congestive heart failure (CHF)?
- A. Pedal edema
- B. Raised JVP
- C. Basal crepitations
- D. Hepatomegaly (Correct Answer)
Explanation: ***Hepatomegaly*** - In children, **hepatomegaly** is a crucial indicator of **right-sided heart failure** due to congestion of the hepatic venous system. - The liver is a compressible organ and can accommodate a significant increase in blood volume, causing it to enlarge considerably before other signs of **venous congestion** become apparent. *Raised JVP* - **Raised jugular venous pressure (JVP)** is often difficult to assess reliably in infants and young children due to their short necks and uncooperative nature. - While present in older children with CHF, it is not considered as sensitive or specific as other signs in younger pediatric patients. *Pedal edema* - **Pedal edema** is less common in pediatric CHF compared to adults, particularly in infants and toddlers. - Their shorter hydrostatic columns and tendency to spend more time supine make dependent edema less prominent. *Basal crepitations* - **Basal crepitations** (rales) indicate **pulmonary edema**, which is a sign of **left-sided heart failure**. - While a part of CHF, **hepatomegaly** is a more consistent and often earlier sign that can be detected across different forms of pediatric CHF (right or left-sided).
Question 8: What is the most common ASD in Down syndrome?
- A. Ostium primum (Correct Answer)
- B. Ostium secundum
- C. Absent atrial septum
- D. Sinus venosus
Explanation: ***Ostium primum*** - **Ostium primum ASD** is the most common type of atrial septal defect (ASD) seen in individuals with **Down syndrome** (Trisomy 21). - This defect is part of a spectrum of **atrioventricular septal defects**, which are hallmarks of congenital heart disease in Down syndrome. *Ostium secundum* - **Ostium secundum ASD** is the most common type of ASD in the general population, but it is less frequently associated with **Down syndrome** compared to ostium primum defects. - It results from inadequate growth of the **septum secundum** or excessive resorption of the **septum primum**. *Absent atrial septum* - An **absent atrial septum**, also known as a common atrium, is a very rare and severe congenital heart defect. - It is not the most common type of ASD seen in Down syndrome, which typically presents with partial or complete atrioventricular septal defects. *Sinus venosus* - A **sinus venosus ASD** is a defect located near the entrance of the superior or inferior vena cava. - While it is a recognized type of ASD, it is relatively uncommon and not the most prevalent type in individuals with **Down syndrome**.
Question 9: Which of the following is least likely in PDA?
- A. CO, wash out (Correct Answer)
- B. Bounding pulse
- C. Pulmonary hemorrhage
- D. Necrotizing enterocolitis
Explanation: ***CO₂ washout*** - **CO₂ washout** is not a recognized clinical complication or standard finding associated with PDA - While PDA causes **pulmonary overcirculation**, this does not translate into a clinically significant "CO₂ washout" phenomenon - The other options represent well-established associations with hemodynamically significant PDA - This is the **least likely** finding in PDA *Bounding pulse* - **Classic finding** in PDA due to left-to-right shunt from aorta to pulmonary artery - Results in **wide pulse pressure** as diastolic pressure drops (blood "runs off" into pulmonary circulation) - Creates characteristic **water-hammer** or **bounding peripheral pulses** *Pulmonary hemorrhage* - Well-recognized complication of hemodynamically significant PDA, especially in **premature infants** - **Increased pulmonary blood flow and pressure** from left-to-right shunt leads to pulmonary edema and capillary damage - Fragile pulmonary vasculature in preterm infants predisposes to **hemorrhage** *Necrotizing enterocolitis* - **Significant association** between PDA and NEC in premature infants - Mechanism: **Diastolic steal** phenomenon causes mesenteric hypoperfusion - The left-to-right shunt diverts blood flow during diastole, leading to **gut ischemia** - PDA is a recognized **risk factor** for NEC development
Question 10: A 2-month-old infant is brought to the clinic because of poor feeding, sweating, and difficulty breathing. The parents state that she was doing very well, and has actually been a "very easy going baby", until about a week ago. They assumed that she was developing a "cold", but it has not passed, and the symptoms have been worsening. Cardiac examination reveals a loud, harsh systolic murmur with a thrill that is heard best at the left sternal border. The most likely underlying abnormality is
- A. aortic stenosis
- B. atrial septal defect
- C. patent ductus arteriosus
- D. ventricular septal defect (Correct Answer)
Explanation: ***ventricular septal defect*** - A **ventricular septal defect (VSD)** causes a **harsh, holosystolic (pansystolic) murmur** best heard at the **left sternal border**, often with a palpable thrill, due to turbulent blood flow through the defect from the high-pressure left ventricle to the lower-pressure right ventricle. - Symptoms like **poor feeding, sweating, and difficulty breathing** in an infant, especially with recent onset and worsening, are consistent with **congestive heart failure** secondary to a large VSD causing significant left-to-right shunting. - The timing of symptom onset (around 2 months) is typical, as pulmonary vascular resistance drops after the first 4-6 weeks of life, increasing the left-to-right shunt and precipitating heart failure. *aortic stenosis* - **Aortic stenosis** typically presents with a **systolic ejection murmur** loudest at the **right upper sternal border** with radiation to the neck, not a harsh holosystolic murmur at the left sternal border. - While severe aortic stenosis can lead to heart failure symptoms, the murmur's location and quality are inconsistent with this diagnosis. *atrial septal defect* - An **atrial septal defect (ASD)** typically causes a **systolic ejection murmur** at the **pulmonary area** (left upper sternal border) due to increased flow across the pulmonic valve, often accompanied by a **fixed, wide splitting of S2**. - Significant heart failure in infancy is rare with an isolated ASD, as the pressure gradient across the atria is usually low, leading to asymptomatic presentation until later childhood or adulthood. *patent ductus arteriosus* - A **patent ductus arteriosus (PDA)** is characterized by a **continuous, machine-like murmur** loudest below the left clavicle (infraclavicular area), not a harsh systolic murmur with a thrill at the left sternal border. - While a large PDA can cause heart failure symptoms in infancy, the distinctive continuous murmur differentiates it from a VSD.
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