The Developing Heart: A 'History' of Pediatric CardiologyPediatric cardiology is celebrating in the 1990s the 50th anniversary of the beginnings of the age of therapy. This informal history' describes how the discipline grew from the era of pathologic anatomy to the dawn of therapy, the beginnings of closed heart surgery between 1939 and 1945. That dawn ushered in a remarkable half century of change and growth, leading from clinicophysiologic correlations through the start of open heart surgery in the