When a newborn has a transposition of the great arteries (TGA), the only chance for survival is:

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In transposition of the great arteries (TGA), the aorta and the pulmonary artery are switched from their normal positions. This means that oxygen-poor blood circulates through the body without going through the lungs, and oxygen-rich blood circulates through the lungs without going out to the body. A connection that allows mixing of oxygenated and deoxygenated blood, such as a patent ductus arteriosus or through an atrial septal defect, is crucial for survival until corrective surgery can be performed. This mixing is necessary for the newborn to receive some oxygenated blood circulation.

When a Newborn Has a Transposition of the Great Arteries