Figure 1

Quick Poll

A full-term infant develops cyanosis, tachypnea, and a sharp drop in oxygen saturation within the first 30 minutes of birth. On examination, she has normal heart sounds, normal liver edge, and oxygen saturation in the low 60s. When placed on continuous positive airway pressure (CPAP) and 100% oxygen, her oxygen saturation remains in the low 70s. A chest X-ray is performed. What is the most likely diagnosis? Image credit: @RonMexico.

• Pulmonary atresia
• Transposition of the great arteries
• Tetralogy of Fallot
• Hypoplastic left heart syndrome

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