This 4-year-old's heart is failing. A federal grant that might help him was canceled (Elissa Nadworny/NPR)

Elissa Nadworny / NPR:
This 4-year-old's heart is failing.  A federal grant that might help him was canceled  —  The device is about the size of a AA battery, and it has the potential to help a baby or infant heart keep beating in the face of failure.  —  It's called the PediaFlow, an implantable artificial heart for the littlest, most vulnerable humans.

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