A heart attack can leave a heart permanently damaged. However, these new "beating" patches might be able to save the lives of those with damaged hearts.

This 3D Bioprinted Organ Just Took Its First "Breath"

https://www.heart.org/en/health-topics/heart-attack/about-heart-attacks

"Scar tissue may form in the damaged area, and that scar tissue does not contract or pump as well as healthy muscle tissue. As a consequence, the extent of damage to the heart muscle can impact how well the heart pumps blood throughout the body."

Lab-grown patch of heart muscle and other cells could fix ailing hearts

https://www.sciencemag.org/news/2019/04/lab-grown-patch-heart-muscle-and...

"Over the past 20 years, the bioengineer from Duke University in Durham, North Carolina, has been developing a 'patch' that could take the place of the cells destroyed by a heart attack. In rodents, he has found it can hook up to the circulatory system and contract."

Heart patch could limit muscle damage in heart attack aftermath

https://www.sciencedaily.com/releases/2019/04/190417153813.htm

"Prior research had shown that mechanical patches could be effective, the researchers say, but no one had done any research on what the optimum mechanical properties of such a patch might be. As a result, the thickness and stiffness of potential patches varies widely. And getting those properties right is important."

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