So the new strategy that the doctor has devised for my father is to keep him on medicine for two weeks in an attempt to dissolve some of the blockage. On the 16th, they'll inject a dye into his veins and reassess the blockage. If it's diminished enought, they will try to use shunts to open the passages. If they're still severely blocked, then they will have to operate to open up the veins.
We had dinner with my parents last night and I have to say that you'd never know my dad was ailing. He recognized all of us, made jokes, ate a big dinner and seemed to be in a really nice frame of mind.
I'm just going to do my best not to dwell on worst case scenarios. A few years back, he made it successfully through a five bypass surgery on his heart. He was wonky for a month afterward, but healed up quickly and was back on his feet much more quickly than projected.
Man, old age really has its downside.