Sorry to hear this nightfly. I will be thinking of you and your family tonight.
On a different note for all/ NIACIN!!!!!!!! It may not help a 99% blockage, but If you have healthy friends that you feel may be in danger of blockage. Try to get them to add some niacin to their diet. It dilates the vein/ateries and cleans out the "gunk" in the veins.
Nightfly it may help your grandfather, but if he is in poor health I do not know if I would try it. The doctor is going to say no for sure, because I will make him no money and they do not want it to get out that a simple thing like niacin is better than and angioplasy(sp?), a balloon inserted into the vein to stretch it open.