You can always use the room phone to call the hospital administrator down to his room. Tell the administrator exactly what happened, and what you will do if anything goes wrong. ANYTHING.
Well, I always start first with the charge nurse, then the doctor in charge of the unit.
My ace in the hole was his cardiologist - the rare Dr. who fights just as hard for old people as he does for the younger.
When I had arguments with a Dr. that did not get resolved, I would tell him. He would look at me and say no one knows him better than you, I will take care of it.