My mother has fdiffuse cerebral edema because of cardiac arrest. she is having little body movements, little eye opening but no concious yet.

Tough problem: The edema is from leakage from vessels and cells which were deprived of oxygen and blood supply while the heart was stopped. This prevents them from working. Depending upon the length of time the brain was deprived as well as the resistance of the cells, as the edema clears there will be some recovery. There is no simple way to predict the timing; hopefully there will be much to gain.l