Which cardiac defect is the most common cyanotic congenital heart disease beyond the neonatal period?

Answer and explanation

Correct answer: D. Tetralogy of Fallot

  1. Step 1: Tetralogy has pulmonary stenosis, VSD, overriding aorta and right ventricular hypertrophy.
  2. Step 2: Tet spells improve with knee-chest position and oxygen.
Answer
Tetralogy of Fallot.
Why not the others: 'Ventricular septal defect' is acyanotic; 'Patent ductus arteriosus' is acyanotic; 'Coarctation of the aorta' is acyanotic.

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