Optic Nerve Key after Heart Attack

After a heart attack and the victim stops breathing, a process of irreversible brain damage starts within 3 to 4 minutes. Must it?  While researching cardiac arrest, Jeffrey Dobkin read about a boy drowning in icy waters.  Although submerged for over half an hour, the boy was rescued, resuscitated, and recovered completely.  No brain damage. 

What delays brain damage in drowning victims?  In an emergency can it be applied to heart attack victims?  Dobkin's research pointed to yes. He believes brain damage that occurs when someone's heart stops beating can be delayed for up to an hour.It relates to the optic nerve. Read on.