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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• The 'boot-shaped heart' (Coeur en sabot) is the classic radiographic finding for Tetralogy of Fallot (TOF).
• This shape is caused by the combination of right ventricular hypertrophy (RVH), which pushes the cardiac apex upward, and a concave main pulmonary artery segment due to pulmonary stenosis.
• TOF is one of the most common cyanotic congenital heart diseases, characterized by four specific defects (PROVe): Pulmonary stenosis, Right ventricular hypertrophy, Overriding aorta, and Ventricular septal defect.
• The right-to-left shunting of deoxygenated blood through the VSD into the overriding aorta results in systemic cyanosis.

Why Other Options Were Wrong

• Option A: An Atrial Septal Defect (ASD) is a left-to-right shunt that causes volume overload of the right atrium and ventricle, leading to cardiomegaly and increased pulmonary blood flow on X-ray, not a boot shape.
• Option B: A Ventricular Septal Defect (VSD) is also a left-to-right shunt. A large VSD leads to left atrial and left ventricular enlargement and increased pulmonary vascular markings, which does not produce a boot-shaped heart.
• Option D: A Patent Ductus Arteriosus (PDA) results in a left-to-right shunt from the aorta to the pulmonary artery. Radiographic findings include a normal or enlarged heart, a prominent aortic knob, and increased pulmonary vascular markings, but not the specific boot shape of TOF.

Related Visual

Clinical Relevance

• Nursing practice connection: Use the key finding related to Radiographic findings in congenital heart disease to guide bedside assessment, documentation, and the next nursing action.
• Recognizing the 'boot-shaped heart' on an X-ray allows for prompt diagnosis and management of TOF, a serious cyanotic heart condition.
• Nurses play a critical role in managing hypercyanotic 'Tet spells' by initiating immediate interventions like the knee-chest position, administering oxygen, and calming the child to prevent severe hypoxia and potential brain injury.
• What if? If the X-ray showed an 'egg-on-a-string' appearance (a narrow superior mediastinum with an enlarged, globular heart), the diagnosis would shift to Transposition of the Great Arteries (TGA), another critical cyanotic defect requiring different immediate management (prostaglandin infusion).

How to Approach the Question

• First, identify the key clinical finding presented in the question stem: a 'boot-shaped heart' on a chest X-ray.
• Recognize this as a classic, pathognomonic sign associated with a specific congenital heart disease.
• Systematically review your knowledge of the radiographic appearances of common congenital heart defects.
• Evaluate the given options: ASD, VSD, and PDA are typically acyanotic (left-to-right shunts) and present with generalized cardiomegaly and increased pulmonary blood flow, not a boot shape.
• Recall that Tetralogy of Fallot is a cyanotic defect whose specific anatomical abnormalities (RVH and pulmonary stenosis) directly cause the boot-shaped appearance.
• Select the option that directly corresponds to this well-known radiographic sign.

Concept Tested & Keywords

• Concept Tested: Radiographic findings in congenital heart disease
• Stem keywords: child, chest X-ray, boot-shaped heart, congenital heart disorder
• Lead-in keywords: indicative of
• Clinical cues: The phrase 'boot-shaped heart' is a classic pathognomonic sign strongly pointing to a specific diagnosis.

Question ID

Qf3jkZd5_t_gKCLM1pBaj5

Copy ID

Reference Book

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

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 588-590