So many different factors can cause heart attacks or strokes. One of those risk factors is ischemia, a condition in which blocked or hardened blood vessels cut off blood supply to tissue, causing stroke, heart attack, or even gangrene or other frightening conditions. Ischemia is treatable with surgery, but that's mostly helpful for larger blood vessels. When the condition occurs in smaller blood vessels or those that have been damaged by prior treatment, things get much more complicated. However, a group of researchers are working on a new treatment with research that involves 3D printed patches of blood vessels. Read more at