Have you ever wondered about how initiating ECMO changes the cardiovascular physiology?  Have you wondered what metrics you should be looking at when resuscitating a patient that has a beating heart and a ECMO flow?  Dr. Sage Whitmore, an ED Intensivist from Nashville with ECMO training from UMichigan, leads us through the basic to the tough questions of ECMO physiology.  Zack Shinar