@QuantMech, while one is doing a code (say for 2 hours), there is no way to know if the brain is being completely deprived of blood. The whole purpose of good CPR is to provide circulation to the body mechanically, all the while the code team is injecting drugs or delivering defibrillation or other interventions to get the heart to the point where it takes over without help. If they coded Jahi for two hours during her initial arrest, I’m guessing (and I don’t know that to be the case without access to the medical record), that’s because they were able to get a rhythm back at intervals, then would lose it again.
I don’t know where the 2 hours without blood supply to the brain you are talking about is coming from. I have no knowledge of a two hour code on the day she arrested. May have happened, I just haven’t seen evidence of it. I’ve seen all kinds of speculation on what caused Jahi’s brain to die. Was it lack of blood due to hemorrhage (we keep reading that she was bleeding out) or lack of blood to the brain as a result of brain swelling which occurred as a reaction to respiratory or cardiac arrest? Was it due to an obstruction in the respiratory tract caused by swelling in the throat or presence of massive quantities of blood? If it was due to brain swelling, that process occurred over a period of time after her heart was re-started, not during a code.
I’ve never seen any medical records which detail what actually happened on the day that Jahi had a respiratory or cardiac arrest, so I can’t answer your question.