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During surgery, a patch is inserted to separate the dead tissue from healthy heart muscle and to bring the heart back to its correct shape. The patch is made of a synthetic material called Dacron, which is also used to make fabrics and replacements for the aorta, the main artery leading out of the heart. The dead tissue is not removed; the patch simply isolates it from the functioning heart muscle. The remodeled heart cavity is smaller and more powerful.