Tetralogy of Fallot is a congenital heart disease that consist of 4 defects in the right side of the heart. Here is a picture of a 
Madisons heart...
Madisons heart...Tetralogy of fallot heart...(in simple terms)
1-Thinning of the pulmonary valve, which pumps blood to the lungs
2-enlarged right side of the heart
3-Over riding aorta (which mixes the bloods)
4-VSD (hole)
To repair this they have to fix #1 (by opening up the valve) and #4 (by patching the hole) and this will fix #2 and #3.http://www.americanheart.org/presenter.jhtml?identifier=1299
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