I have visited with both the surgeon who performed the CABG and my cardiologist, not to mention studying this subject on various medical sites online. Lo and behold, grafts do fail, for any number of reasons–intimal proliferation (essentially vein hardening), competitive flow (essentially blood uses another-maybe partially blocked-path and the graft closes), bad veins (mine supposedly were excellent), and of course medical error. Depending on which site you visit, and which doctor you talk to, the failure is generally 10-15%, tho I've seen higher numbers on some sites. For me, 4 of 5 grafts have no flow, which is a shockingly big percentage. I still have appts with two other cardiologists and my PCP, but I don't expect any major new information.
What this means for me basically is that the original CABG was for nothing, especially since a stent was recently inserted in the 80% blocked LAD. I have a 2nd angiogram scheduled in 3 wks to stent the RCA, the other major blockage seen at this time. Another shock, tho, is that the other artery blockages that led to the CABG in the first place are flowing well, perhaps to the diet change and the statin usage. I really hadn't heard of any such possibility before so I guess there's good news along with the bad.
I'm calmer about the situation now. I have no symptoms, I'm continuing the good habits, and I'm doing everything I want to do, albeit carefully.