Surgery: A Better Half-Heart. 4 minute read. TIME. April 29, 1966 12:00 AM GMT-4.

“The right chamber of the heart does the work of both chambers after surgery,” she said. “Essentially, it’s half a heart.” The problems bring baggage.

Luka McDonald's doctors call him a miracle. Doctors said the boy born with half his heart would be lucky to live to age five. But, the now 12-year-old is thriving after receiving a heart transplant.

LAS VEGAS, Nev. (FOX5) - Grayson Gallardo is an 11-year-old boy who has a bright smile and big dreams. Gallardo was born with a rare congenital heart defect called Tricuspid atresia.