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>shifted from head-down to head-up, I was overcome by strong 'cold'
>narcosis (tunnel vision, paranoia,no sense of time passage). Not
>until I ascended to 60 ft did the symptoms go away.
Symptoms of cerebral hypoxia
>I told the University's Diving Safety Officer about this and he thought
>it was due to what he called 'blood pooling'. As I was decending head
>down and kicking strongly, the blood vessels in my head constricted
plausible
>to ensure an adequate blood supply to my legs.
Nonsense, blood supply to the brain is always given priority over blood
suplly to every other organ (except the myocardium).
>When I went head-up
>the combination of constricted vessels and gravity caused a low
>blood pressure condition in my head, causing (along with the depth)
>the extreme narcosis. Does this sound reasonable or has anyone
Yes, it sounds reasonable.
/Rat
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
shelps@ac*.ma*.ad*.ed*.au* Stephen Helps
FAX (08)232-3283 Anaesthesia & Intensive Care
Voice (08)224-5495 University of Adelaide
ADELAIDE, 5005, South Australia
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If there is a 50-50 chance that something can go wrong, then 9
times out of ten it will. (Paul Harvey News, 1979)
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