X-Message-Number: 3696
Newsgroups: sci.cryonics
From:  (Michael Clive Price)
Subject: Re: Cloning and Neurosuspension
References: <3f4mrf$>
Date: Sat, 14 Jan 1995 10:00:43 +0000
Message-ID: <>

"Martin R. Olah" writes:
>>-    less perfused.  For neuropatients the perfusion concentrates
>>     on the head, without being slowed down by having to perfuse
>>     the rest of the body.
>
> I am unaware of neuro suspensions providing a superior perfusion
> to the brain.  If so, I'd like to know more about it, especially
> from someone who performs them both.

I too will happily take a correction from an experienced neuro- and
whole-body perfusionist, but until then it seems reasonable to me to
suppose that one of the time-limiting factors in a suspension is the
rate of throughput and loading of cryoprotectants and other perfusates. 
For a neurosuspension this has to be less of a problem because you tie
off all the other arteries from the aorta.  The perfusates go straight
to the head.

In addition I can see some tricky situations arising for the whole-body
perfusionist.  What happens if the head shows signs of a complete
perfusion, but the body doesn't?  (Something which is quite likely in
practice, I think, given the arterial structures.)  Does the
perfusionist delay cool-down, trying for a better rest-of-body
perfusion, and thus comprise the neurological preservation or start
cool-down immediately, in which case the patient might as well have
opted for neuro suspension in the first place.

Michael Price                        



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