Enigma of apnea test for brain death on ECMO-an ongoing discussion-case study and review of literature.

Coma, absent brain stem reflexes, and apnea are considered the neurological criteria of brain death. As membrane oxygenator does almost entire gas exchange in patients with severely diseased lungs who are on extracorporeal membrane oxygenation (ECMO), it is not possible to carry out apnea test in routine manner. We described the difficulties we faced conducting the apnea test and the other ancillary tests in our patient on veno-venous ECMO who suffered a major cerebral insult and reviewed the literature of brain death testing in patients on ECMO.