That's because left-behind scar tissue is more rigid than healthy heart tissue. Because it flexes less, it can restrict the heart's proper functioning and lead to future complications.

After Heart Attack, Turning Scar Tissue Back Into Beating Heart Cells Apr 18, 2012 6:37 PM EDT ...

"Scar tissue turned into heart muscle without using stem cells." ScienceDaily. ScienceDaily, 26 April 2012. <www.sciencedaily.com / releases / 2012 / 04 / 120426174110.htm>.