So what is it that you need for being conscious, blood flow or EEG? Cortex or brain stem?
For consciousness, a working cortex, supplied with oxygenated blood with glucose. You also need a brain stem to function because ALL the function of the brain passes through that and the eyes ears and gag reflex are controlled by it.
First of all, during CPR there is blood flow to the brain, otherwise there would be no survivors.
There is insufficient blood supply, only 10 % (according to Parnia who has measured it ) achievable during CPR.
"...otherwise there would be no survivors"
No, people have survived absent of heartbeat without CPR for tens of minutes, it all depends on the circumstances.
Four minutes seem to be critical time limit.
That's completely wrong
QUOTE="Small Dog, post: 92547, member: 2564"]Second, brain stem is not needed for conscious experiences. Patients with brain stem injuries (stroke) can be conscious, for instance.[/QUOTE]
Injuries but not absence of according to the literature
Brain stem
The brain stem is the stem-like part of the base of the brain that is connected to the spinal cord.
The brain stem controls the flow of messages between the brain and the rest of the body, and it also controls basic body functions such as breathing, swallowing, heart rate, blood pressure, consciousness, and whether one is awake or sleepy.
Brain stem death is where a person no longer has any activity in their
brain stem, and has permanently lost the potential for consciousness and the capacity to breathe. This may happen even when a ventilator is keeping the person's heart beating and oxygen is circulating through their blood.
The Brain Stem
Pretty much everyone knows that the brain stem connects the spinal cord to the brain proper. It deals with highly instinctive survival functions including breathing, digestion, heart rate, and blood pressure; and controls many reflex motor responses. The brain stem includes the reticular formation, which is > *essential to consciousness* < and plays a major role in arousal (being awake and alert). The brain stem receives many types of sensory input and 'pre-processes' it before sending it on to higher parts of the human brain. The top section of the brain-stem is called the pons (bridge).
Yet many patients report dreams and memories after waking up, especially when prodded for it. I had a dream while being anaesthetised myself a few years ago.
That's as maybe but your brainstem was still intact and the point I'm trying to make is that in cardiac arrest the brainstem doesn't function, the patient is dead. If that is you, Linda we've been over this many times..