Hi. I need help with a research on amnesia, and i'll be glad if you could help me out. My question is. Can a patient suffer from retrograde amnesia after being a victim of an accident that leaves them in coma for two years? What I mean is if a patient is a victim of a severe accident that affected a part of their brain and left them in coma for two years, can they suffer from retrograde amnesia when they wake up from coma?