Tamil Nadu Chief Minister Jayalalithaa was shifted back to the Intensive Care Unit of the Apollo Hospitals after she suffers heart attack. Now she is on an Extracorporeal Membrane Oxygenation (ECMO) heart assist device that aids cardiac and respiratory functions. What is ECMO and how does it function. Here is a brief explainer on the same. br ----------------------------------------------------------------------------------------------------------br Subscribe to OneIndia News Channel for latest updates on movies and related videos.