I know a lot about bypass surgery. I'm an MD and you are WAY too worried. First of all, if dad was on death's door no way his doc would even consider going to a game...or anywhere else for that matter. He'd be in ICU with monitors stuck in every orifice.
Second of all bypass surgery is about as complicated as having your appendix out. It's been refined to what we call "cookbook" status over the years. Do it by the numbers and it RARELY goes wrong. True, there is the occasional death but it's usually someone who was too far gone to begin with. Doesn't sound like dad fits this category.
I've seen a bunch of these things over the last two decades and they almost always work out well. Dad will feel great in only a few days. Biggest complication following bypass? The patient goes back to the cigarettes and Cheeto's and clogs his newly installed fuel lines. Most bypasses are good for ten years. Well managed, that can stretch to twenty. Poorly managed you can clog 'em in two.
You OSO'ers have been very kind to me in my efforts to sell my recent ill gotten boat. If I can repay by answering med questions I would be only too happy to do so. If you have more specific Q's re: dad email me anytime.
Dudley Evans, M.D.