Nurse here: This drives me nuts. Patients tell me all the time their harrowing story about how they were “dead for 6 minutes” or however long, before being “brought back to life” and their oxygen depleted brain made them hallucinate heaven, and how real it was. Dead means brain death. Your heart rhythm at the time has nothing to do with it. Unfortunately, explaining this to someone who is trying to explain why they appreciate life now makes you an asshole, so I don’t.