Certainly would be a rare event to consider, but something that a couple should discuss: if the spouse should ever fall into a condition where they couldn't make choices for their self, what things would they want their mate to accept or negate.
I know if I ever woke up from a coma to the news that I had a kid, I'd be telling my husband "your responsibility, Dude. If I had known I was pregnant, I wouldn't haven't continued it."