The most common congenital heart disease in children is:

Appeared in: AIIMS Delhi NO- 2019

Explanation

Ventricular septal defect (VSD) is the most frequently occurring congenital heart anomaly, making up about 30-40% of all cases.
It is characterized by an abnormal opening in the wall (septum) separating the left and right ventricles.
This defect results in a left-to-right shunt, where oxygen-rich blood is pumped back to the lungs instead of to the body, causing the heart to work harder.
While many small VSDs close spontaneously, larger ones can lead to significant health issues if not corrected.

Option A: Tetralogy of Fallot (TOF) is the most common cyanotic congenital heart disease, but it is not the most common overall. Its prevalence is significantly lower than that of VSD.
Option C: Atrial septal defect (ASD), a hole between the atria, accounts for approximately 10% of congenital heart diseases, making it less common than VSD.
Option D: Patent ductus arteriosus (PDA), the failure of a fetal blood vessel to close after birth, also has a prevalence of about 10%, which is much lower than VSD.

Clinical Relevance

Nursing practice connection: Knowing Prevalence of Congenital Heart Diseases helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses assessing infants with a suspected VSD should listen for a characteristic holosystolic (pansystolic) murmur, best heard at the left lower sternal border.
Key nursing interventions for an infant with a large VSD include monitoring for signs of heart failure, such as poor feeding, tachypnea, sweating during feeding (diaphoresis), and failure to thrive.
Patient education is crucial. Parents should be taught how to recognize signs of worsening heart failure and the importance of high-calorie feedings to support growth.

How to Approach the Question

This is a factual recall question that tests your knowledge of pediatric cardiology epidemiology.
First, identify the core of the question: which congenital heart disease is the 'most common' in children.
Recall the relative prevalence of the major congenital heart defects.
A common point of confusion is between the most common overall defect and the most common cyanotic defect. Remember that Ventricular Septal Defect (VSD) is the most common overall.
Tetralogy of Fallot (TOF) is the most common cyanotic defect, but its overall incidence is lower than VSD.
Compare the prevalence of the options: VSD (most common), followed by ASD and PDA, with TOF being less frequent overall.

Concept Tested & Keywords

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E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 2 (215-514) p. 1

E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 541-543

Practise the full AIIMS Delhi NO- 2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.