Flanken-cut beef short rib (short ribcut across the bone into half-inch thick strips you may need to ask your butcher to do this) is a wonder, but hangar steak, skirt steak, even flank steak (marinated overnight) will work well too.
The service is all that care from the surgeon, the team of nurses, the time in a hospital bed, heck, the pain itself (you do have to cut open the rib cage to do heart surgery).