The connections between the neurons is the architecture. The neurons themselves have state. If that state is wiped across the brain, I'd be surprised if the body connected to it could even still keep itself alive.
To the actual question though, neurons die/fail very quickly at their normal metabolic rate without an oxygen supply. You are certainly dead once that happens.
These procedures are all about providing some oxygen and dropping the metabolic rate to keep the neurons alive longer than they would unassisted.
The connections between the neurons is the architecture. The neurons themselves have state. If that state is wiped across the brain, I'd be surprised if the body connected to it could even still keep itself alive.
To the actual question though, neurons die/fail very quickly at their normal metabolic rate without an oxygen supply. You are certainly dead once that happens.
These procedures are all about providing some oxygen and dropping the metabolic rate to keep the neurons alive longer than they would unassisted.