If the bypass surgery was to correct a congenital defect (say a narrowing of the arteries), not because of an infarct, that could be scheduled well in advance. (It was for my father-in-law.)

Big Apricot Superman Movieverse
The World of Lois & Clark
Richard White to Lois Lane: Lois, Superman is afraid of you. What chance has Clark Kent got? - After the Storm