Lizzie Asher was pregnant when she collapsed from large blood clots in her lungs. Her baby was delivered by emergency cesarean section and Lizzie was kept alive by Drs. Daniel Brodie and Matthew Bacchetta and their ECMO machine. ECMO stands for "extracorporeal membrane oxygenation." The machine oxygenates and removes carbon dioxide from the blood; performing the function of lungs and allowing the lungs of an ill person to rest and recover.