“Here’s your chance,” S., the chief resident, said. I had never done one before. “Get set up and then page me when you’re ready to start.” It was my fourth week in surgical training. The pockets of my short white coat bulged with patient printouts, laminated cards with instructions for doing CPR and using the dictation system, two surgical handbooks, a stethoscope, wound-dressing supplies, meal tickets, a penlight, scissors, and about a buck in loose change. As I headed up the stairs to the patient’s floor, I rattled. This will be good, I tried to tell myself: my first real procedure. My patient—fiftyish, stout, taciturn—was recovering from abdominal surgery he’d had about a week before. His bowel function hadn’t yet returned, leaving him unable to eat. I explained to him that he needed intravenous nutrition and that this required a “special line” that would go into his chest. I said that I would put the line in him while he was in his bed, and that it would involve my laying him out flat, numbing up a spot on his chest with local anesthetic, and then threading the line in.