Boot shaped heart is seen in

KGMU 2024

Medical & Surgical Nursing

Easy

Appeared in: KGMU 2024

Explanation

Tetralogy of Fallot (ToF) is the correct answer as a 'boot-shaped' heart is its classic radiological sign on a chest X-ray.
This appearance is caused by right ventricular hypertrophy, which pushes the cardiac apex upward.
A concave main pulmonary artery segment, resulting from pulmonary stenosis or a hypoplastic pulmonary artery, contributes to the 'boot' silhouette.

Option A: Aortic stenosis leads to left ventricular hypertrophy due to the increased workload of the left ventricle pumping against a narrowed aortic valve. It does not produce a boot-shaped appearance.
Option B: Coarctation of the aorta is classically associated with a 'figure-3' sign on X-ray and rib notching, not a boot-shaped heart. These signs are due to the aortic narrowing and development of collateral circulation.
Option C: A large Patent Ductus Arteriosus (PDA) leads to increased pulmonary blood flow, causing cardiomegaly and prominent pulmonary vascular markings. It does not create the specific boot shape seen in ToF.

Visual 1: Chest X-ray. An anteroposterior chest X-ray of an infant showing a 'boot-shaped' heart (coeur en sabot), characterized by an upturned cardiac apex and a concave pulmonary artery segment. This helps learners visualize the key diagnostic sign.
Visual 2: Diagram. A schematic diagram illustrating the four anatomical defects of Tetralogy of Fallot: 1) Ventricular Septal Defect, 2) Pulmonary Stenosis, 3) Overriding Aorta, and 4) Right Ventricular Hypertrophy. This clarifies the underlying pathology.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Radiological findings in congenital heart disease as background academic context rather than a clinical decision trigger.
Recognizing the 'boot-shaped' heart is a key diagnostic step in identifying Tetralogy of Fallot, a common cyanotic congenital heart disease, allowing for timely intervention.
Nurses play a critical role in managing infants with ToF, especially during hypercyanotic 'tet spells'. Promptly placing the infant in a knee-chest position can be life-saving by increasing systemic vascular resistance and improving pulmonary blood flow.
What if? If the X-ray showed an 'egg-on-a-string' appearance instead of a boot shape, the most likely diagnosis would be Transposition of the Great Arteries (TGA), another critical cyanotic congenital heart defect.

How to Approach the Question

First, identify the key phrase in the question stem: 'Boot shaped heart'.
Recognize that this is a classic radiological finding described in medical and nursing textbooks.
Recall or deduce the association between this specific sign and the congenital heart defects listed in the options.
Systematically evaluate each option. Aortic stenosis and PDA primarily affect the left side of the heart or pulmonary flow without this specific shape. Coarctation has its own unique signs ('figure-3' and rib notching).
Conclude that 'boot-shaped heart' is uniquely characteristic of Tetralogy of Fallot, which involves right ventricular hypertrophy causing the specific silhouette.

Concept Tested & Keywords

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