A few more details, I remain curious too.
Cardiologist James Brennan was Mae's cardiologist in LaGrange. He is listed as a specialist at WGHS (the facility that Mae was admitted to in Georgia, and has since been removed from).
Cradiologist Thomas Gore is also of LaGrange, and is also listed as practicing at WGHS.
http://www.wghs.org/p-specialty.html
The doctors determined that Mae Magouirks aortic dissection is contained and not presently life threatening. I.e., she isn't terminal.
Obviously, at least one other doctor disagrees (or did), since Mae had to be certified terminal in order to be admitted to hospice. I assume that the doctor who certified Mae as terminal was Dr. Stout (sp?).