If you feel it would worry him a lot, then I would gather as much information as you can about the surgery first, because he will ask lots of questions and want answers.
Thank you for replying. Actually I don't have report with me right now but i remember doctor saying that natural bypasses are created in their heart hence he dint face any problem yet. We are going for bypass surgery but i am worried about being it risky. and we hvnt told this to dad yet, what is the right time to tell this to dad?
This is a difficult one. The Left circumflex, the LAD are both diseased heavily at the start of the vessel. I don't believe that Angioplasty will work. There is a big chance they will re-block and quite quickly. There is no mention on your report about the LIMA and RIMA vessels being checked. These are in the chest and are excellent for being used for bypass. I would ask about these. I can't imagine that you haven't formed a natural bypass on the RCA (collaterals) because you would be very ill. Maybe this doesn't need a bypass. I would seriously consider bypass, but would want the LIMA/RIMA involved if possible.