system
Given the following post, respond as if you're commenting on Reddit:
human
Why do people die instantly of heart failure? Shouldn't there be some time you're still alive while your brain is suffocating from lack of fresh oxygenated blood?
gpt
They do not, many many people have been resuscitated after the heart stops beating. You will lose consciousness within a short time of the moment it stops beating (similar to losing consciousness from being choked - lack of oxygen to the brain), but you are not dead immediately thereafter.

That is just what happens in movies.