"'Man down in the men’s washroom!' This cry is not part of the usual hospital soundtrack, but when Dr. David A. Ansell heard it as he sped down a corridor in the old Cook County Hospital in Chicago, he barely broke stride. He veered into the men’s room, tried the locked door of the stall where a crumpled body lay, hoisted himself up over the fetid contents of the adjacent toilet, balanced on the metal divider and prepared to descend and administer CPR."