He came in at 1 in the morning, and I triaged him. His chief complaint: "Well, my chest kind of hurts, and my girlfriend made me come in." His girlfriend sat next to him, appearing fretful and unhappy. The patient was a 37 year old who appeared to be in general good health. I was tired. It had been a long shift so far, having been spent sticking IVs into dehydrated babies suffering from GI bugs that have been particularly vicious this year. I was shipping demented elderly people to the floor at a record pace, and the nurses in...