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Difficulty: HardPediatric Cardiovascular Disorders

Match the following pediatric clinical vignettes, characterized by distinctive electrocardiographic (ECG) or chest radiograph (CXR) findings, to their most likely underlying congenital cardiovascular diagnosis.

  • A 1-day-old severely cyanotic neonate; ECG demonstrates left axis deviation, absent R waves in the right precordial leads, and left ventricular hypertrophy.Tricuspid atresia
  • A 4-month-old infant with hypotonia, upward slanting palpebral fissures, and a holosystolic murmur; ECG reveals a superior QRS axis (extreme left axis deviation) and a prolonged PR interval.Complete atrioventricular septal defect
  • A 2-month-old infant with mild cyanosis and tachypnea; CXR reveals an enlarged supracardiac shadow resembling a 'snowman' and increased pulmonary vascular markings.Total anomalous pulmonary venous return
  • A 1-month-old infant with a harsh systolic ejection murmur at the left upper sternal border; CXR shows a boot-shaped heart with an upturned apex and decreased pulmonary vascular markings.Tetralogy of Fallot

Answer

The correct pairings align specific imaging and ECG findings with their respective pathologies: Left axis deviation in a cyanotic newborn indicates Tricuspid atresia; a superior QRS axis in a Down syndrome patient indicates a Complete atrioventricular septal defect; the 'snowman' sign indicates Total anomalous pulmonary venous return; and a boot-shaped heart indicates Tetralogy of Fallot.
Each congenital heart defect has distinct anatomical and hemodynamic consequences that manifest as highly specific electrocardiographic and radiographic patterns. Recognizing these classic diagnostic associations is crucial for rapid identification and management in pediatric cardiology.

Step-by-Step Solution

1
Analyze the first vignette describing a cyanotic neonate with left axis deviation and left ventricular hypertrophy.
Matches with Tricuspid atresia.
Normal newborns typically have right axis deviation and right ventricular dominance. The presence of left ventricular hypertrophy in a cyanotic newborn is highly specific for tricuspid atresia, as the right ventricle is hypoplastic.
2
Evaluate the second vignette describing a dysmorphic infant (Down syndrome features) with a superior QRS axis on ECG.
Matches with Complete atrioventricular septal defect.
This is the most common congenital heart defect in patients with Down syndrome. The abnormal displacement of the AV node causes early activation of the posteroinferior left ventricle, resulting in the classic superior QRS axis.
3
Examine the third vignette describing the 'snowman' sign on a chest radiograph.
Matches with Total anomalous pulmonary venous return.
In the supracardiac variant of TAPVR, the anomalous vertical vein and dilated innominate vein form the upper loop of the 'snowman' above the normal cardiac shadow.
4
Assess the final vignette describing a boot-shaped heart with decreased pulmonary vascular markings.
Matches with Tetralogy of Fallot.
Right ventricular hypertrophy tilts the apex of the heart upward, while hypoplasia of the pulmonary outflow tract creates a concavity, perfectly producing the 'coeur en sabot' or boot-shaped heart.

Key Concept

Classic Electrocardiographic and Radiographic Findings in Congenital Heart Disease
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Topics

Pediatric Cardiovascular Disorders

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