A child comes to the hospital. His chest X-ray reveals a “boot-shaped heart.” This finding is indicative of which congenital heart disorder?

1. A

   Atrial septal defect (ASD)

2. B

   Ventricular septal defect (VSD)

3. C

   Tetralogy of Fallot (TOF)

4. D

   Patent ductus arteriosus (PDA)

Appeared in: NORCET 9 Mains - 2025

Explanation

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• Tetralogy of Fallot (TOF).
• The "boot-shaped heart" or "Coeur en sabot" is a classic radiological finding for TOF.
• This shape is caused by right ventricular hypertrophy (which uplifts the cardiac apex) and a concave main pulmonary artery segment.
• The other listed conditions (ASD, VSD, PDA) typically present with cardiomegaly and increased pulmonary blood flow, not a boot-shaped heart.

Why Other Options Were Wrong

• Option A: Atrial Septal Defect (ASD) typically causes an enlarged heart (cardiomegaly) and increased blood flow to the lungs (pulmonary plethora) due to the left-to-right shunt, but it does not create the specific boot shape.
• Option B: A large Ventricular Septal Defect (VSD) also leads to cardiomegaly (specifically left atrial and ventricular enlargement) and increased pulmonary vascular markings, not the characteristic boot shape seen in TOF.
• Option D: Patent Ductus Arteriosus (PDA) results in increased blood flow to the lungs, leading to cardiomegaly and a prominent aortic knob. It does not cause the right ventricular hypertrophy that leads to the boot shape.

Related Visual

• Visual 1: Annotated X-ray - An image of a chest X-ray with arrows pointing to the upturned cardiac apex and the concave pulmonary artery segment, clearly labeling the features of the 'boot-shaped heart'.
• Visual 2: Diagram - A schematic diagram comparing the heart silhouettes in TOF, ASD, VSD, and PDA to illustrate the different radiological appearances.
• Visual 3: Illustration - A drawing showing the four anatomical defects of Tetralogy of Fallot (pulmonary stenosis, VSD, overriding aorta, and RVH) and how they contribute to the overall heart shape.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Radiological findings in congenital heart disease to guide bedside assessment, documentation, and the next nursing action.
• Recognizing the 'boot-shaped heart' on a chest X-ray is a critical diagnostic clue that prompts immediate further investigation for Tetralogy of Fallot, a serious cyanotic heart condition requiring surgical intervention.
• Nurses caring for infants with TOF must be vigilant for signs of hypercyanotic 'Tet spells' and be prepared to implement immediate interventions like the knee-chest position to improve oxygenation.
• What if the X-ray showed an 'egg-on-a-string' appearance instead? This would be indicative of a different cyanotic heart defect, Transposition of the Great Arteries (TGA), where the mediastinum appears narrow due to the abnormal positioning of the great vessels.

How to Approach the Question

• First, identify the key finding in the question stem: the 'boot-shaped heart' on a chest X-ray.
• This is a classic 'buzzword' in medical imaging. Your task is to recall which specific congenital heart defect is associated with this sign.
• Review the options provided, which are all common congenital heart defects.
• Systematically evaluate each option against your knowledge of their typical radiological presentations.
• Select the option that is classically defined by the 'boot-shaped heart' sign, which is Tetralogy of Fallot.

Concept Tested & Keywords

• Concept Tested: Radiological findings in congenital heart disease
• Stem keywords: chest X-ray, boot-shaped heart, congenital heart disorder
• Lead-in keywords: indicative of
• Clinical cues: [object Object]

Question ID

Qf3jkZd5_t_gKCLM1pBaj5

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