MCQ: Dilated Cardiomyopathy (DCMP) | Management

Correct answer: A. ACE inhibitor and diuretic

This child has acute decompensated heart failure due to dilated cardiomyopathy, demonstrated by cardiomegaly, S3 gallop, hepatomegaly, edema, LV dilatation, global hypokinesia, and an ejection fraction of only 30%. Coronary origins are normal, making an anomalous coronary origin such as ALCAPA unlikely.

The initial pharmacological approach is aimed at relieving congestion and reducing ventricular afterload. Therefore, an appropriate initial combination is a diuretic plus an ACE inhibitor, provided the child’s blood pressure and renal function permit ACE-inhibitor therapy.

Why A is correct

A. ACE inhibitor and diuretic — Correct

The child has clear evidence of congestive heart failure:

• Breathlessness and tachypnea
• Poor appetite
• Facial and pedal edema
• Abdominal distension
• Hepatomegaly
• S3 gallop
• Marked cardiomegaly
• Dilated LV with global hypokinesia
• EF 30%

A diuretic, such as furosemide, provides relatively rapid symptomatic relief by reducing pulmonary and systemic venous congestion.

An ACE inhibitor, such as enalapril, reduces systemic vascular resistance and LV afterload, thereby reducing the workload of the failing ventricle. ACE inhibitors are an important component of therapy for pediatric systolic heart failure due to ventricular dysfunction.

In a child who is significantly congested, the immediate clinical priority is to relieve fluid overload while initiating disease-modifying heart-failure therapy as tolerated.

The BP is 90/60 mmHg, so the child would need careful assessment of perfusion, renal function and blood pressure before starting or escalating an ACE inhibitor. If there is significant hypotension or poor perfusion, stabilization takes priority.

Why the other options are wrong

B. Beta-blocker alone — Incorrect

Beta-blockers such as carvedilol or metoprolol can have an important role in chronic pediatric systolic heart failure, but they are not the appropriate sole initial treatment for a child who is clinically congested.

This child has edema, hepatomegaly, abdominal distension and an S3 gallop, indicating active heart failure.

Starting or increasing a beta-blocker in an acutely decompensated, poorly perfused patient can initially worsen myocardial contractility and cardiac output.

Therefore, a beta-blocker may be considered later in a clinically stable child, rather than being used alone as the initial treatment here.

C. Digoxin alone — Incorrect

Digoxin may provide symptomatic benefit and can sometimes be used as an adjunct in pediatric heart failure, particularly when symptoms persist despite standard therapy.

However, digoxin alone does not adequately address the significant volume overload and increased afterload demonstrated in this child.

A diuretic is needed to relieve congestion, while an ACE inhibitor provides afterload reduction.

Therefore, digoxin alone is not the best initial pharmacological strategy.

D. Prostaglandin infusion — Incorrect

Prostaglandin E1 is used to maintain ductal patency in duct-dependent congenital heart disease, such as:

• Critical coarctation
• Interrupted aortic arch
• Hypoplastic left heart syndrome
• Pulmonary atresia

This child is 3 years old, has a dilated LV with global systolic dysfunction, and has normal coronary origins. Nothing in the presentation suggests a duct-dependent cardiac lesion.

Therefore, prostaglandin infusion has no role here.

E. Sildenafil — Incorrect

Sildenafil is a pulmonary vasodilator used primarily in pulmonary hypertension.

There is no evidence in the case of significant pulmonary hypertension or pulmonary vascular disease. The primary abnormality is left ventricular systolic dysfunction with dilated cardiomyopathy.

Sildenafil would therefore not be the appropriate initial treatment.

High-yield exam point

The key distinction is:

Dilated LV + global hypokinesia + EF 30% + clinical congestion = systolic heart failure → diuretic + afterload reduction.

For an exam question asking for the initial pharmacological management, look for evidence of congestion. The presence of edema, hepatomegaly, abdominal distension and S3 makes a diuretic particularly important.

Reference: 

Kliegman RM, St. Geme JW III, Blum NJ, Shah SS, Tasker RC, Wilson KM, editors. Nelson Textbook of Pediatrics. 22nd ed. Philadelphia: Elsevier; 2024.

You can also practice another MCQ on Dilated cardiomyopathy clinical presentation & Managemment.