Holy crap, this book is intense. I'm about 2/3 of the way through and wondering if anyone else has read it.
It's not for the faint of heart - it's about the hellscape a New Orleans hospital became after Katrina. There is gross, sad, horrible stuff going on, and the moral quandary the doctors end up in is one for the ages. Here's the original NYT article by the author, which, if I remember correctly, is a good condensed version of the book.