Boot-shaped heart in a chest X-ray is commonly associated with?

Appeared in: ISRO- 2016

Explanation

The image displays a 'boot-shaped' heart (coeur en sabot), which is the classic radiographic finding for Tetralogy of Fallot (TOF).
This distinctive shape is caused by the combination of right ventricular hypertrophy (which pushes the cardiac apex upward) and a concave main pulmonary artery segment.
TOF is a cyanotic congenital heart defect characterized by four primary anatomical abnormalities, which lead to this specific X-ray appearance.

Option A: Mitral stenosis leads to left atrial enlargement, which typically presents as a straightening of the left heart border on a chest X-ray, not a boot shape.
Option B: Rheumatic fever can cause carditis and generalized cardiomegaly (an enlarged heart), but it does not produce a specific, characteristic silhouette like the boot shape.
Option C: Aortic regurgitation causes left ventricular volume overload, leading to a large, 'globular' heart with a downwardly displaced apex, which is distinct from the upturned apex of a boot-shaped heart.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Radiographic interpretation of congenital heart defects as background academic context rather than a clinical decision trigger.
Recognizing the 'boot-shaped' heart on an X-ray is a critical skill for nurses, as it prompts immediate suspicion for TOF, allowing for timely diagnosis and management.
Nurses must be able to identify and manage hypercyanotic 'tet spells,' a life-threatening complication of TOF. The priority is the knee-chest position to improve pulmonary blood flow.
What if? If an infant with known TOF suddenly becomes irritable, breathes rapidly, and turns deeply blue, this indicates a 'tet spell.' The nurse's immediate action is to place the infant in a knee-chest position and administer oxygen, while calling for urgent medical assistance.

How to Approach the Question

First, analyze the image provided. Identify the key visual feature, which is the unique 'boot shape' of the heart silhouette.
Recognize this as a classic, pathognomonic sign taught in pediatric cardiology.
Recall the specific congenital heart defect associated with the 'coeur en sabot' or boot-shaped heart.
Scan the options to find the condition that matches your recall, which is Tetralogy of Fallot (TOF).
Confirm the choice by mentally eliminating the other options based on their known, different radiographic appearances.

Concept Tested & Keywords

Concept Tested: Radiographic interpretation of congenital heart defects.
Stem keywords: Boot-shaped heart, chest X-ray
Lead-in keywords: commonly associated with
Clinical cues: The visual cue 'boot-shaped heart' is a pathognomonic sign that directly points to a specific diagnosis.
Negative lead-in flag: false

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E6 Nelson Textbook of Pediatrics(2024) — Volume 2 pp. 590-592, 663-665

E6 Medicine Davidson Principles Practice 24e p. 470-472

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