@jlh945 I've not seen one done while laying on the back either; presumably this was to make it easier to broadcast it on national TV and not have to have Harry's posterior as visible (and enable a better overall shot, with him able to converse, etc.).
An oxygen cannula (the tubing below the nose) is fairly standard while someone is under light anesthesia, just to keep blood oxygen levels as high as possible. (Blood O2 is typically monitored, along with blood pressure, heart rate and rhythm.)
I am trying to get up the nerve to get mine done (for my own health - and so I have some infleuence on a friend who needs one also). I just need to stop cancelling the appointments my doc has scheduled for me to have mine - and get it over with. Thanks Katie and Harry for the informative experience you shared with us all. (It did bring me closer to going through with it... soon... I think).
Very good to encourage folks to have a colonoscopy. I'm having one next week. Check your health insurance, as may be covered with nothing out of pocket. Mine is paid for by my health insurance once every 10 years past 50 yo for preventative medicine.
Thanks Katie and Harry and CBS!