I think we either go by what our doctors tell us, knowing they don't really know, or try and speculate because we don't really know either.
With weight lifting, it has been said here that weight lifting can create a valsalva condition, if a person is lifting and straining. A valsalva would cause the jugulars to fill as blood flow is for the time stopped until the move is released. So a valsalva would stretch the jugulars out wide. I believe we are all performing valsalvas every time we, ahem, strain a bit while on the toilet. So we are probably not going to be able to avoid valsalvas 100% regardless, but is it good or bad to have this happen? Could a valsalva overstretch a jugular and cause more bleeding or injury at the angio site, leading to thrombosis or clotting?
While I don't know one way or the other, and I've also worried about the opposite (that if I continue to sleep on an inclined bed post-liberation, the jugulars will not be filling as they should and could be more likely to grow together in a clot), I will personally avoid weight-training hard enough to have a valsalva post-liberation until such time as it can be assumed that the angio site is fully healed. Also, maybe taking laxatives to avoid straining of the other sort would not be amiss either! But this is all speculation. I'm also thinking we should avoid sugar post-liberation because sugar in diabetics seems to spur on greater intimal hyperplasia growth; this is a cause of restenosis when it is not elastic recoil. But this is, as I said to start, all speculation.