Cardiac rehabilitation is only to help the recovery after the flow of blood has been re- established.
If they cannot fix it with stents, then the only option is operation.
The fear to the operation can be solved. I had "terror" to the needles to the extend of do not allow anybody to call for help while I was having a massive MI.
After survive to it, and by chance, I learn that there is a branch of kinesiology that treat fears. A kinesiologist solved my fears in 2 sessions of 20 minutes.
Jesus
There are only three major arteries supplying the heart. With two of them blocked and only one patent, the only reasonable therapeutic approach is open heart surgery for bypass installation. Bypasses supply the parts of the vessel that lie "behind" the stenosis / occlusion with blood, so the blockage gets bypassed.
HOWEVER: One very important consideration is whether the parts of the heart that are supplied by the occluded vessels consist of viable tissue at all (or just plain fibrotic tissue); because, if it was just fibrotic tissue even perfect bypasses would not help; To determine that, your father needs to undergo a nuclear scan (FDG-PET) or cardiac MRI.
If there is viable tissue that just lacks blood supply, bypass surgery would improve his life expectancy tremendously.
With kind regards,
F.Schwarz