Olivia- I had not thought about those reasons. That does appear to be what happens, but not valid for those of us experiencing these procedures.
As part of my treatment, I had a port installed. They punctured my lung. To re-inflate it, they gave me some lidocaine and morphine and immediately pushed a tube through my side with no explanation. Was completely unprepared for pain level and to lose my breath, but also to have my abdominal muscles go into a spasm that doubled me over. All done in my bed. It was really pretty horrific and ofcouse, the Dr immediately turned and walked out and left the nurse dealing with me. This all delayed my treatment schedule by a month. None of this was good, but I learned it could have been handled differently.