Your grandmother should take cayenne pepper. One teaspoon in a glass of juice daily, not on an empty stomach. This will help her entire cardiovascular system and regulate her blood pressure, should this also be a problem. The cayenne will be hot but it will not blister her throat or stomach. Just have something cold that she can chase it down with. If this is too difficult for her you can get cayenne supplements. In fact, Unyquity, a member of curezone makes a marvelous cayenne tincture. But that is also hot. However, not only will she make the tincture, she will give you invaluable advice and will be there to help you. I highly recommend this route. You can email me if you are interested in contacting her.
Cayenne also repairs a damaged heart. And, cayenne will stop a heart attack dead in its tracks.