Any surgery runs the risk of causing post op ileus, longer surgeries make the risk higher and post-op narcotics can make it worse.
I had never suffered from them until 2008 (about my 30th surgery)...suddenly I was that person, the one who throws up her guts for 3 days post op and keeps walking the hallways like a robot.
There is nothing that they can do to prevent them and nothing that you can do once they start other than riding them out and eventually getting the dreaded NG tube put in.
Physical activity helps. Walking as much as possible up and down the hallways (unless you are home, in which case, climb the stairs, circle the kitchen and roll around on that big, fat, yoga ball), massaging the zone, and movement.
I am not sure why it suddenly appears when it had never happened before but it does. Not sure why some post ops are fine and other not.
I just ride it out.
Good luck with it
Sharon