When I was training to become a paramedic, we had to go on rounds with doctors and nurses in the emergency room. We needed to know what kinds of injuries we would expect to treat in the field, especially ones caused by accidents. I think irrigation and debridement was the hardest procedure to observe. I was in a bad car wreck myself, and all I could do was feel the victim's pain as the doctors washed out the wounds and extracted glass and rocks and other debris.
It proved to be very useful training for actual code runs, since paramedics can do some irrigation and debridement on accident victims before putting them on a gurney for transportation.