The only equation that matters is Time = Brain every second a stupendously large number of neurons die. at 4 hours the damage is complete, there will be tot

The only equation that matters is Time = Brain every second a stupendously large number of neurons die. at 4 hours the damage is complete, there will be total wipe-out of the infarcted area. you really want to get to emergency within half an hour. Note, this is for an ischaemic stroke. If you have a haemorragic stroke (usually in the elderly and in those with ruptured aneurysms) there will be little that is possible except supportive care